SMITHSONIAN CONTRIBUTIONS TO THE

EARTH SCIENCES

NUMBER 2

PauiA.Mohr Catalog of

Chemical Analyses

of Rocks from the

Intersection of the

African, Gulf of Aden,

and Red Sea

Rift Systems

J S S U E D

OEC16UHJ

SMITHSONIAN INSTITUTION PRESS

CITY OF WASHINGTON

197O
ABSTRACT

Paul A. Mohr, Catalog of Chemical Analyses of Rocks from the Intersection of

the African, Gulf of Aden, and Red Sea Rift Systems. Smithsonian Contributions

to the Earth Sciences, 2, 7-(-[392] pages, 1970.—A compilation is presented of

all published chemical analyses of rocks from the Red Sea, Gulf of Aden, and

Ethiopian rift junction area. The chemical analyses are accompanied by further

computations, in particular weight-norm and Niggli values, and by brief mineralogical descriptions. A full bibliography and indexes are included.

Official publication date is handstamped in a limited number of initial copies and is recorded

in the Institution's annual report, Smithsonian Year.

UNITED STATES GOVERNMENT PRINTING OFFICE

WASHINGTON : 1970

For sale by the Superintendent of Documents, U.S. Government Printing Office

Washington, D.C. 20402 - Price $2.75 (paper cover)
PaulA.Mohr Catalog of

Chemical Analyses

of Rocks from the

Intersection of the

African, Gulf of Aden,

and Red Sea

Rift Systems

Introduction

This compilation lists all rock-analyses known to the

author which refer to the PreCambrian Basement

and the Tertiary-Quaternary volcanics of Ethiopia,

the Somali Republic, Afar and Issa (ex-French Somaliland), Yemen, South Yemen, and the Red Sea

islands. The region thus comprises the Arabo-Ethiopian swell and its complexly developed rift systems.

The Ethiopian region is becoming of particular

interest to those studying the world ridge-rift system,

first because it presents a rift triple-junction (the

Red Sea, Gulf of Aden, and African rift systems meet

at Afar), and second, because die world's largest

alkaline volcanic province is developed at this triplejunction. For discussions on the spatial, chronological,

and chemical distributions and relationships of these

lavas, the reader is referred to other papers by the

author (1963, 1965, 1968, 1970).

While, with the introduction of rapid, though

less precise, chemical techniques, the number of Ethiopian rock analyses is burgeoning, there remains

Paul A. Mohr, Smithsonian Astrophysical Observatory, Cambridge, Massachusetts.

amongst geologists working in Africa a lack of

knowledge of previous geochemical work relevant

to Ethiopia. This is undoubtedly because many of

the earlier published analyses lie in Italian literature

not easily accessible. Even where the reader suspects

analyses to exist, it can prove a time-consuming task

to track down the journal concerned and to obtain

a copy of it.

The author, impressed by the usefulness of various

rock-analysis compilations published by Dr. Marjorie

Hooker of the United States Geological Survey, has

therefore endeavored to produce a similar one for

the Ethiopian field. This compilation has been made

as complete as possible, but omissions and errors are

no doubt present and notification of these will be

gratefully received, as will lists of new analyses due

for publication.

Acknowledgements

Dr. W. G. Melson gave both encouragement and

assistance in bringing this work to the publisher. Dr.

I. L. Gibson suggested several improvements to the

analytical format. The author is most grateful to Mrs.

G. Schrauwen for her efficient typing of the text matter.
SMITHSONIAN CONTRIBUTIONS TO THE EARTH SCIENCES

Format

Each analysis is presented in a fixed format. The

top four lines describe as follows:

line 1. Identification number for this compilation, starting with 101 for Basement rocks

and 1001 for volcanic rocks. Identification

numbers are in chronological order of

publication, and within a given publication are in order of increasing SiO2 content.

line 2. Rock-type.

line 3. Coordinates, in degrees and minutes of

arc, of the locality where the specimen

was collected (a blank indicates they are

not known), followed by a place-name

description.

line 4. Author and year of publication (referees are given in full on pages 3 and 4).

The original rock-names ascribed by the analysts

are generally retained, but in some cases, particularly where "lava" units have since been recognised

as welded tuffs, a modification has been made.

Where it is considered that a rock-name is in need

of radical revision, the suggested alternative follows

in square brackets after the given name. The Italian

term 'liparite' is translated as rhyolite.

All specimen localities are specified, where ever

possible, by latitude and longitude coordinates

taken from the best available maps, but their accuracy cannot always be guaranteed. Some authors

give vague descriptions of localities, while others

give an unreferenced place-name which cannot be

found on any recent map. The unfortunate inadequacy of many locality descriptions, especially in

terms of stratigraphical position, derives from the

fact that in many cases the analyst and author was

not the collector of the rock specimen (see Repossi,

1932, p. 296, for comments on some consequences

of this situation).

Following the first four lines of the print-out, the

analytical format is presented in two levels. The

upper level shows the originally published rock

analysis (The value 0.00 signifies "not determined"

unless remark is made to the contrary). To the

right of the rock analysis is a water-C02-free computation of this analysis, summated to 100.0, and farther to the right are atomic proportions in terms

of weight and numbers.

The lower level of data shows computed CIPW

norms, one based directly on the published analysis

and the second with all Fe203 in the analysis converted to FeO. These weight norms are calculated

as far as LC (leucite), any further silica deficiency

being printed out explicitly as such; similarly with

carbon dioxide in excess of CC (calcite) and phosphorus pentoxide in excess of AP (apatite). Niggli

values follow to the right of the norms, and then

some three-component percentages for use in plotting triangular diagrams (where F = total iron;

M = MgO, C = CaO, N = Na20, K = K20). D.I.

stands for differentiation index (FeO -\- Fe203 / MgO

+ FeO + Fe203).

The analytical and computed data are accompanied by a paragraph of "remarks" on such factors

as quality and possible errors of the published analysis; by a "mineralogy" paragraph containing a very

brief summary of the given mineralogy of the rock;

and by any pertinent "other information" such as

modal percentages and specific gravity.

Quality of Analyses

It is inevitable in producing a compilation of rockanalyses from numerous sources that the quality of

analysis will vary considerably. This fact must be

borne in mind, considering the equal treatment

given to all analyses here. Thus the "Remarks" paragraph must always be scrutinised when examining

a particular analysis. Some of the older Ethiopian

analyses are of inferior quality; Arsandaux, for example, quotes his values to only one decimal place,

and many authors quote "loss on heating" rather

than separate determinations of H20-(-, H20- and

CO2. Loss-on-heating is listed under H20-f- in this

compilation.

Cases where oxide values have been transposed,

or are manifestly incorrect, are noted under "Remarks" for the analysis concerned. Of particular note

are the persistently exagerated MnO values in the

analyses of Roman, and suspiciously high ferric/ferrous iron ratios in analyses of some early authors.

Several instances of incorrect summations are noted;

in some it is not known whether the error dies in

the summation figure itself, or in one of the oxide

values.
NUMBER 2

References

Abbate, E., P. Facibeni, A. Gregnanin, G. Merla, and M. Sagri

1969. Basalt Flows and Related Sandstones in the Socota

Area (Northern Ethiopia). Bolletino Societa Geologica Italica, 88: 499-516.

Aloisi, P.

1927. Rocce della Somalia, Raccolte dalla seconda Missione Stefanini. Memorie, Societa Toscana di Scienza

Naturali di Pisa, 38: 132-152.

1934. Studio di Alcune Rocce della Migiurtinia. Memorie,

Societh Toscana di Scienza Naturali di Pisa, 44: 203-

223.

1938. Geologia della Somalia: Le Rocce Eruttive e gli

Scisti Cristallini della Somalia Italiana. Reale Societa

Geographica Italiana, Bologna, II (I) : 1-63.

Arsandaux, H.

1903a. Contribution a 1'Etude des Roches Sodiques de l'Est

Africains. Comptes Rendus de V Academie Scientifique

de Paris, 137: 876-879.

1903b. Contribution a 1'Etude des Roches Basaltiques de

l'Est Africains. Comptes Rendus de I'Acade'mie

Scientifique de Paris, 137: 1308-1311.

Augustithis, S. S.

1964. On the Phenomenology of Phenocrysts (Tecoblasts,

Zoned Phenocrysts, Holo-Phenocrystalline Rock

Types). Special Bulletin of Petrogenesis, Institute

of Petrogenesis and Geochemistry, Athens: 15—31.

1965. Mineralogical and Geochemical Studies of the

Platiniferous Dunite-Birbirite-Pyroxenite Complex

of Yubdo/Birbir, W. Ethiopia. Chemie der Erde, 24:

159-196.

Comucci, P.

1928. Contributo allo Studio della Rocce Effusive della

Dancalia. Memorie, Societa Toscana di Scienza Naturali di Pisa, 39: 93-113.

1930. Sopra Alcune Rocce Vulcaniche della Regione di

Sanaa (Arabia) . Memorie, Societa Toscana di Scienza

Naturali di Pisa, 40: 170-78.

1932. Alcune Rocce dei Dintorni di Addis Abeba (Abissinia). Processi Verbali Societa Toscana di Scienza

Naturali di Pisa, 41: 100-111.

1933a. Note Petrografiche sulle Rocce Raccolte dalla Spedizione Cerulli nell'Etiopia Occidentale. In: Cerulli,

E., Ethiopia Occidentale, Roma, 2: 227-244.

1933b. Rocce dello Iemen Raccolte dalla Missione de S. E.

Gasparini. Periodico di Mineralogia: 4, 89—131.

1948. Le Rocce della Regione di Jubdo (Africa Orientale).

Atti della Accademia Nazionale dei Lincei (Roma),

262 pp.

1950. Le Vulcaniti del Lago Tana (Africa Orientale). Atti

della Accademia Nazionale dei Lincei (Roma), 209

pp.

Dainelli, G., and O. Marinelli

1912. Risultati Scientifici di un Viaggio nella Colonia

Eritrea. Firenze, 601 pp.

De Angelis, M.

1923. Note di Petrografia Dancala—I. Atti Societa Italiana

di Scienza Naturali, 62: 179-200.

1925. Note de Petrografia Dancala—II. Atti Societa Italiana

di Scienza Naturali, 64: 61-84.

De Gennes, A., and A. Bonard

1900. Les Roches Volcaniques du Protectorate des Somalis.

Comptes Rendus de I'Academie Scientifique de Paris,

131: 196-198.

Duparc, L.

1930a. Sur les Basaltes et les Roches Basaltiques du Plateau

Abyssin. Schweizerische Mineralogische und Petrographische Mitteilungen, 10: 1—37.

1930b. Sur un Trachyte a Anorthose de Gambeila (Abyssinie). Compte Rendus (des Seances) Societe de

Physique et d'Histoire Naturelle de Geneve, 47: 50-

53.

Duparc, L., and E. Molly

1927a. Sur la Roche du Fantalli (Abyssini). Schweizerische

Mineralogische und Petrographische Mitteilungen,

7: 412-413.

1927b. Sur une Augitite d'Abyssinie. Compte Rendus (des

Seances) Societe de Physique et d'Histoire Naturelle

de Geneve, 44: 159-160.

1928a. Sur la Presence de la Kenyite sur le Plateau Abyssin.

Compte Rendus (des Seances) Societe de Physique et

Histoire Naturelle de Geneve, 45: 22-23.

1928b. Sur la Tokeite, une Nouvelle Roche d'Abyssinie.

Compte Rendus (des Seances) Societe de Physique et

d'Histoire Naturelle de Geneve, 45: 24-25.

El-Hinnawi, E. E.

1964. Petrochemical Characters of African Volcanic Rocks.

Ethiopia and the Red Sea Region (including Yaman

and Aden). Neues Jahrbuch fiir Mineralogie, Monatshefte, 3: (1), 65-81.

Filjak, R., N. Glumicic, and Z. Zagorac

1959. Oil Possibilities of the Red Sea Region in Ethiopia.

Naftaplin, Zagreb, 104 pp.

Gass, I. G., and D. 1. J. Mallick

1968. Jebel Khariz: An Upper Miocene Strato-Volcano of

Comenditic Affinity on the South Arabian Coast.

Bulletin Volcanologique, 32: 33-88.

Gaubert, M. P.

1901. Sur les Echantillons de Roches d'Abyssinie Rapportes par M. Ch. Michel Paris, Musee National

d'Histoire Naturelle, Bulletin, 7: 27-28.

Gellatly, D. C, and G. Hornung

1968. Metasomatic and Nepheline-Bearing Gneisses from

Darkainle, Somali Republic. Journal of Geology, 76:

678-691.

Gortani, M., and A. Bianchi

1937. Osservazioni Geologiche e Petrografiche nella Regione

di Harar (Africa Orientale Italiana). Bolletino della

Societa Geologica Italiana, 56: 499-516.

Hieke Merlin, O.

1941. Alcune Ossidiane dell'Africa Orientale Italiana.

Rendiconti della Societa Mineralogica Italiana, 1:

107-120.
SMITHSONIAN CONTRIBUTIONS TO THE EARTH SCIENCES

1948. Sulla Presenza di Basalti Limburgitica nell'Africa

Orientale. Rendiconti delta Accademia Nazionale

dei Lincei, 5: 70-77.

1949. Fades Ultramafiche nei Basalti dell'Africa Orientale.

Rendiconti della Accademia Nazionale dei Lincei,

6: 89-97.

1950a. Chimismo di Lave Basaltiche della Regione Hararino-Dancala in Africa Orientale. Rendiconti della

Societa Mineralogica Italiana, 6: 101-118.

1950b. I Basalti dell'Africa Orientale. Memorie degli Istituti di Geologia e Mineralogia dell'Universita di

Padova, 17: 42 pp.

1952. Ricerce sulla Lave Acide della Regione HararinoDancala in Africa Orientale (nota preliminare).

Rendiconti della Societa Mineralogica Italiana, 8:

124-128.

1953. Le Vulcaniti Acide dell'Africa Orientale. Memorie

degli Istituti di Geologia e Mineralogia dell'Universita di Padova, 18: 45 pp.

Lacroix, A.

1930. Les Roches Hyperalcalines du Massif du Fantale et

du Col de Balla (Abyssinie). Memoires, Societe

Geologique de France, Paris, 6: 89—102.

LeBas, M. J., and P. A. Mohr

1970. Tholeiite from the Simien Alkali Basalt Centre,

Ethiopia. Geological Magazine (in press).

Macdonald, R., and I. L. Gibson

1969. Pantelleritic obsidians from the volcano Chabbi

(Ethiopia). Contributions to Mineralogy and Petrology, Berlin, 24:239-244.

Manasse, E.

1904. Rocce della Colonia Eritrea Raccolte a Sud di

Arafali. Processi Verbali Societa Toscana di Scienza

Naturali di Pisa, 14: 96-109.

1905. Sopra le Zeoliti di Alcune Rocce Basaltiche della

Colonia Eritrea. Processi Verbali Societa Toscana di

Scienza Naturali di Pisa, 15: 65-72.

1908. Rocce Eritree e di Aden della Collezione Issel.

Memorie Societa Toscana di Scienza Naturali de

Pisa, 24: 153-204.

1909. Contribuzioni allo Studio Petrografico della Colonia

Eritrea. Siena, 169 pp.

1917. Rocce della Somalia Italiana Raccolte dalla Missione Scientifica Stefanini-Paoli (1913). Memorie,

Societa Toscana di Scienza Naturali di Pisa, 31: 3-

74.

Merla, G., and E. Minucci

1938. Missione Geologica nel Tigrai. Reale Accademia

Italiana, Roma, 1.

Mohr, P. A.

1963. The Ethiopian Cainozoic Lavas—a Preliminary Study

of some Trends: Spatial, Temporal and Chemical.

Bulletin of the Geophysical Observatory, Addis

Ababa, 6: 103-144.

1965. Re-classification of the Ethiopian Cainozoic Volcanic

Succession. Nature, 208: 177-178.

1968. The Cainozoic Volcanic Succession in Ethiopia. Bulletin Volcanologique, 32: 5-14.

1970. Volcanic Composition in Relation to Tectonics in

the Ethiopian Rift System—a Preliminary Investigation. Bulletin Volcanologique (in press).

Muhlen, L. von zur, and J. H. Hellmers

1936. Die Petrographie der Eruptivegesteine der Dabussteppe und der Hochlandes von Wollega in Westabessinien. Neues Jahrbuch fur Mineralogie, Geologie

und Paleontologie, (A) 71: 241-290.

Pagliani, G.

1940. Pantelleriti e Basalti di Gimma (A.O.I.). Rendiconti,

Istituto Lombardi di Scienza e Lettere, Milan, 123:

33-43.

Pantanelli, D.

1886. Roccie di Assab. Memoirie, Societa Toscana di Scienza

Naturali di Pisa, 7: 29-30.

Prior, G. T.

1900. On Aegirine and Riebeckite Anorthoclase Rocks

Related to the "Grorudite-Tinguaite" Series, from

the Neighbourhood of Adowa and Axum, Abyssinia.

Mineralogical Magazine, 12: 255-273.

Repossi, E.

1932. Rocce Eruttive. In: Savoja L. A. (Duke of Abruzzi)

La Esplorazione dello Uabi, Uebi Scebeli. Mondadori, Milan: 279-304.

Ricciardi, L.

1886. Sulla Composizione Chimica delle Rocce Vulcaniche

di Assab. Bolletino della Societa Geologica Italiana,

5: 57-60.

Rodolico, F., and R. Pieruccini

1942. Rocce Filoniane del Tigrai. Commentationes, Pontificia Academia Scientiarum, 6: 788-812.

Rohleder, H. P. T. a,nd C. S. Hitchen

1930. Vulkanologische Beobachtungen Langs der Bahnlinie Adis Abeba-Djibouti (Abessinien). Zeitschrift

fiir Vulkanologie, Berlin, 12: 269-289.

Roman, D.

1926. Studii Petrografice in Yemen (regiunea HodeidaSanaa). Annuarul Institutului Geologic al Romaniei,

11: 207-299.

Scherillo, A.

1938a. Su Alcune Zeoliti dell'Eritrea. Periodico di Mineralogia, 9: 61-69.

1938b. La Celadonite delle Rocce Eruttive dell'Altipiano

Eritreo. Periodico di Mineralogia, 9: 253-264.

Shukri, N. M., and E. Z. Basta

1955. Petrography of the Alkaline Volcanic Rocks of Yaman.

Bulletin de I'Institut d'Egypte 36, 129-164.

1959. Petrography of the Volcanic Rocks of Aden. Bulletin

of the Faculty of Science, Cairo University, 35: 87-

107.

Tazieff, H., G. Marinelli, F. Barberi, and J. Varet

1970. Geologie de l'Afar Septentrional. Bulletin Volcanologique, 33: 1039-1072.

Weber, M.

1906. Die petrographische ausbeute der expeditionen O.

Neumann - v. Erlanger nach Ostafrika und Abessynien 1900-1901. Mitteilung der Geographisch

Gesellschaft in Munchen, 1: 637-660.
Index to Place Names and Rock Types

The numbers in this index refer to analysis list number. The precise place-name of each specimen is not

given here, where the purpose of the index rather requires an easily recognisable town, province or regional

name.

Place Names: Basement Rocks

Eritrea

Adi Kai, 111

Adi Quala, 120

Anseba valley, 106, 107, 112, 115, 118

Asmara, 113, 117, 123

Digsa, 114, 121

Etkokan Mt., 161

Keren, 108, 119

Massawa, 1041

Saganeiti, 105, 109, 110, 116, 122

Socotra Archipelago, 102, 103

Somali, North

Adadle, 101

Darkainle, 162-170

Kandala, 135

Manja Yahan, 134

Somali, South

Bur Akaba, 124, 126, 129, 130

Bur Gulo, 125, 127

Bur Meldak, 128

Malabli, 131

Wollega

Dabus Valley, 136-45

Ghimbi, 148, 149, 155, 156, 158

Sariti (?), 160

Tulu Bottegi (?), 153

Yubdo, 132, 133, 146, 147, 150-152, 154, 157, 159

Place Names: Cainozoic Volcanics

Afar

Alid,1043, 1045, 1049, 1051-1053

Ayelu,1218,1232, 1237

Bio Caboba,1216, 1230, 1231, 1240

Erta-ali, 1268, 1270, 1271, 1273-1277, 1279-1281, 1284, 1286

Fant-ali, 1018, 1019, 1081, 1104, 1108-1113, 1118, 1120, 1121,

1159, 1160

Gar-uli, 1283, 1285

Lake Assali,. 1269, 1278

Lake Julietti, 1058, 1089, 1272, 1282

Miesso, 1020, 1233, 1236

Sardo, 1229, 1239

Aisha horst, 1223

Arussi

Highlands, 1103, 1133, 1135

Chabbi, 1311-1321

Bali, 1129,1131, 1132

Beghemder

Addis Zemen, 1189, 1200, 1201, 1205

Gondar, 1179, 1180, 1185, 1195, 1203

Simien, 1187, 1208, 1209, 1322

Danakil horst

Adaylo, 1061, 1062, 1264-1267

Assab-Beilul, 1001-1003, 1084-1087, 1091, 1221

Baharassoli-Dubbi, 1059, 1060, 1083, 1088, 1090, 1092

Eritrea

Adi Kai, 1050

Adi Ugri, 1046, 1047

Asmara, 1042, 1044

Massawa, 1041

Senafi,1048,1054, 1055

ex-French Somaliland, 1009-1015, 1023, 1024, 1027, 1029, 1030,

1114-1116

Gojjam

Bahar Dar, 1177, 1181, 1188, 1192

Consela, 1190, 1196, 1207

Danghila-Enjabara, 1182, 1183, 1186, 1193, 1197-1199

Lake Tana, 1178

Hararge

Chercher, 1017, 1025, 1031, 1033, 1105-1107, 1152, 1225

Farso, 1151, 1224

Harar, 1213, 1222, 1226

Jildessa, 1032

Ilubabor, 1102, 1103, 1137, 1175, 1176

Kaffa,1136,1154-1157

Red Sea, 1147

Shoa

Adama-Mojjo, 1123, 1134, 1158, 1210, 1234

Addis Ababa, 1117, 1119, 1122, 1124-1128, 1215, 1235

Addis Alem, 1101

Debra Berhan-Debra Sina, 1211, 1217, 1227

Kassam, 1021, 1022, 1026, 1028

Socotra, 1016

Somali, North, 1148

Somali, South, 1056, 1057, 1079, 1080

South Yemen

Aden, 1035-1040, 1262, 1263

J. Khariz, 1287-1308

Tigray

Adua-Axum, 1004-1008

Enda Selassie, 1153

Makalle, 1161-1167

Sokota, 1309, 1310
SMITHSONIAN CONTRIBUTIONS TO THE EARTH SCIENCES

Wallo

Batie, 1212, 1214, 1220

Borkenna,1238

Dessie-Lake Hayk, 1219, 1228, 1241

Utchali, 1242

Wollega

Dabus, 1149, 1150

Didessa, 1098, 1099

Ghimbi, 1168, 1173, 1174

Guder, 1082, 1093, 1094, 1100

Lekemti, 1169

Nejjo, 1170, 1171

Yubdo, 1097, 1172

Yemen

San'a-Hodeida, 1063-1078, 1095, 1096, 1138-1146, 1243-

1245, 1248-1250, 1253

Ta'iz, 1246, 1247, 1251, 1252, 1254-1261

Rock Types: Basement

Adamellite, 117

Amphibolite, 124, 148, 150

Anorthosite, 138, 149

Aplite, 121, 122, 130,131, 134, 160

Birbirite, 133

Diorite, 102, 107, 109-114, 125, 126, 130, 137, 141-143, 151,

152, 154

Dunite, 132, 147

Gabbro, 138, 139, 149, 151

Gneiss, 127, 128, 162-166

Granite, 101, 103, 113, 118-121, 129, 135, 144, 145, 156-159

Keratophyre, 123

Kersantite, 105, 108

Malchite, 115, 116

Nepheline Syenite, 167-170

Porphyry, 102, 123, 161

Pyroxenite, 106, 148

Rhyolite, 156

Schist, 136, 140, 146, 155

Syenite, 153

Teschenite, 1041

Xenolith, 1S7

Rock Types: Cainozoic Volcanics

Andesite, 1266, 1309

Ankaramite, 1014,1063, 1243, 1244, 1269, 1272

Augitite, 1082

Basalt (not distinguished), 1001-1003, 1034, 1067, 1089, 1130,

1133,1151, 1168, 1219, 1226

andesine, 1083, 1268, 1270, 1274-1277

ankaramitic, 1063, 1243, 1269, 1272

aphyric, 1025-1027, 1031, 1084, 1088, 1095, 1144, 1152, 1180,

1185, 1193-1195, 1222-1225, 1322

calcitic, 1085, 1086

hyalo,1177, 1178, 1186, 1188, 1245, 1248

picritic, 1138-1142, 1192

porphyritic,

augite, 1247

augite-olivine, 1056, 1079, 1080, 1094, 1143, 1147, 1148,

1211-1213, 1220

olivine, 1009, 1010, 1042, 1043, 1045, 1086, 1087, 1097,

1098, 1101, 1117, 1125, 1136, 1154, 1162, 1163, 1165,

1166, 1179, 1181, 1184, 1188, 1246, 1246, 1249, 1250,

1264, 1287-1291

plagioclase, 1015, 1028-1030, 1032, 1033, 1035, 1099, 1100,

1182, 1183, 1189-1191, 1196, 1210, 1215-1218, 1221,

1265, 1271, 1273, 1292, 1293, 1310

Bostonite, 1048, 1072, 1172, 1174

quartz-bostonite, 1054, 1055, 1069, 1071

Camptonite, 1044

Comendite, 1023, 1024, 1052, 1060, 1074-1076, 1115, 1128 ,1175,

1234, 1235, 1237-1242, 1259, 1267, 1303, 1306, 1308

riebeckite, 1016

tridymite, 1053

Dacite, 1038, 1051

Dyke, 1044, 1046, 1054, 1055, 1093,1097, 1137, 1161-1163, 1172,

1174,1219,1226,1306, 1322

Grorudite, 1006, 1007, 1254

Hornblendite, 1187

Kenyite, 1093

Kersantite, 1137

Limburgite, 1214

Microgabbro, 1161, 1164, 1294

Microgranite, 1108, 1110, 1144

Microsyenite, 1017, 1293

Nephelinite, 1129, 1132

Obsidian, 1006, 1011, 1012, 1019, 1021, 1052, 1090, 1092, 1109,

1111, 1113, 1123, 1145, 1160, 1202, 1204, 1206, 1207,

1235, 1237, 1239, 1263, 1311-1321

Paisanite, 1008, 1050

Pantellerite, 1018-1022, 1040, 1059, 1073, 1078, 1109, 1112-

1114, 1116, 1120-1124, 1135, 1155-1160, 1233, 1236, 1263,

1282, 1283, 1285, 1311-1321

Phonolite, 1103, 1149, 1150, 1198-1201

Pumice, 1049, 1091

Rhyolite, 1011-1013, 1049, 1077, 1091, 1092, 1145, 1153, 1204-

1209, 1260, 1261, 1284, 1286, 1301, 1304, 1305, 1307

Solvsbergite, 1005, 1105-1107

Teschenite, 1041

Tinguaite, 1004, 1046, 1057, 1131, 1132, 1167

Trachyte, 1039, 1047, 1081, 1090, 1096, 1119, 1173, 1202, 1227-

1229, 1278-1281, 1297, 1298

analcime, 1062

anorthoclase, 1102, 1126, 1127, 1257, 1258

arfvedsonite, 1058

olivine, 1104

quartz, 1176, 1203, 1232, 1254, 1300, 1302

riebeckite, 1255, 1256

sanidine, 1230, 1231

trachyandesite, 1036, 1037, 1061, 1068, 1070, 1170, 1171, 1295,

1296

irachybasalt, 1065, 1066, 1083, 1129, 1134, 1149, 1169, 1197,

1251-1253, 1262

irachydacite, 1038

tuff and agglomerate, 1047, 1128, 1135, 1298
Rock Analyses
101

GRANITE

9.42N 44.40F ,

A. BOliMEK-BEDEfc,

ADADLE. h.

1894

SI02

TI02

AL203

FF.2O3

FEO

MNU

MGU

CAO

NA20

K2O

P2O5

H2O*

H2Oco<:

SO3

CU

CL

PB

TOTAL

ORIGINAL

ANALYSIS

73.38

.02

13.67

.30

.BB

0.00

.09

1.17

2.99

6.47

.16

.67

0.00

0.00

.37

.02

.02

.05

0.00

100.26

V.ATER-C02-FREE

(100.0)

74.02

.02

13.79

.30

.89

0.00

.09

1.1b

3.02

6.53

.16

SI

Tl

AL

Ft3

FE2

MN

MG

CA

NA

K

P

H*

Hc

s

0

ATOMS

WEIGHT

34.28

.01

7.23

.21

.66

0.00

.05

.84

2.22

5.37

.07

.01

0.00

0.00

.15

49.04

ATOMS

NUMBERS (100.0)

25.56

.01

5.61

.08

.26

0.00

.05

.44

2.02

2.88

.05

63.06

0

OR

AB

AM

NE

LC

AC

NS

DI

kO

HY

OL

VT

hi

IL

TI

RU

mtlGHT :.GPM

(1OO.O)

£ A . 5 0

U.00

3B.68

^5.59

4.74

0.00

0.00

0.00

0.00

.16

0.00

1.50

0.00

.44

I). 00

.04

0.00

0.00

NON-OXIDATION NORM

(FE2O3 COftvEHTED TO FEO)

28.20

0.00

38.71

25.61

4.75

0.00

0.00

0.00

0.00

.16

0.00

2.20

0.00

0.00

0.00

.04

0.00

0.00

NICiGLl

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

az

420

46.

6.

7.

40.

1.

159

IlM FEI-.H.S =

3-COMPONENT

WT.PERCENTS

F 11.0 0

9.99

9.91

80.10

78.13

60.R7

11.01

BASEMENT

No. 101

REMARKS: MnO and ZrO traces, H2O "by difference";

two versions of this analysis are published together, the

second containing 0. 96% CaO and 1. 18-0. 30% FeO.

MINERALOGY: Microgranite. Groundmass: Kaolinised

microcline, orthoclase, plagioclase, quartz; accessory

biotite, muscovite, chlorite, rutile, magnetite, ilmenite,

pyrite, apatite, zircon.

OTHER INFORMATION: Mode: ca. 75% feldspar, 20%

quartz.

No. 102

REMARKS: No separate determination of H O-.

MINERALOGY: Not given.

No. 103

REMARKS: No separate determination of H O-; MnO

trace.

MINERALOGY: Not given.
QUART£-MUSCOvITE LlORITt PORMIYRY

12.12N 52.lbE, ARD-EX-KUFU ISLAND,

A. PEL1KAN, 1902

SOCOTRA ARCHIPELAGO

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K 2 0

P2O5

H20+

H20-

C02

S0 3

TOTAL

ORIGINAL

ANALYSIS

64.10

0.00

15.65

6.66

2.38

0.00

4.40

2.57

1.71

0.00

. 8 5

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.76

k*ATER-cO2-FREE

(100.0)

64.81

0.00

1S.B2

6.73

2.41

o.oo

X.46

4.45

2.60

1.73

0.00

51

TI

AL

FL3

FE2

MN

MG

CA

NA

K

P

H *

H -

C

S

ATOMS

WEIGHT

29.95

0.00

8.28

4.66

1.85

0.00

.87

3.14

1.91

1.42

0.00

. 0 1

0.00

0.00

0.00

ATOMS

NUMRERS (100. 0

22.92

0

6

1

0

1

1

0

0 0

6 0

8 0

7 1

0 0

7 7

6 9

7 8

7 8

0 0

0

a

OR

AR

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

T I

RU

AP

CC

MGO/MCJO«KEO

IN FEMlCS =

wfclGHT NORI"1

(100.0)

31.?3

1.56

10.24

22.04

22.13

0.00

0.00

0.00

0.00

0.00

0.00

3.f.3

0.00

7.7B

1.39

0.00

0.00

0.00

0.00

0.00

1.00

NON-OX I DAT I ON NORM

(FE203 CONVEKTED TO FEO)

24.97

1.58

10. 3B

22.33

22.42

0.00

0.00

0.00

0.00

0.00

0.00

18.33

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.25

c

ALK

K

MG

TI

P

C F M

OZ

17.7

13.4

.30

.23

0 . 0

0.00

.52

86

3-COMPONENT

WT.PERCENTS

F 61.25

M 9.76

A 29.00

F 51.02

C 74.83

A 24.15

N 79.61

K 19.70

C 50.69

103

RIEBECKITE GRANITE

12.30N 54.00E, SOCOTKA ISLAND,

A. PELIKAN, 1902

INDIAN OCEAN

SIU2

TIU2

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K 2 0

P2O5

H20*

H20-

C02

S0 3

TOTAL

OklcIilAi.

ANALYSIS

7B.49

0.00

9.99

1.94

1.18

0.00

. 0 9

. 3 0

3.74

3.84

0.00

• 72

0.00

0.00

0.00

0.00

0.00

0.00

0.C10

100.29

*ATER-C02-FREE

(100.0)

78.83

0.00

10.03

1.95

1.19

0.00

. 0 9

. 3 0

3.76

3.86

0.00

51

TI

AL

Ft3

FE2

MN

M&

CA

NA

K

P

H-f

H -

C

S

ATOMS

WEIGHT

36.67

0.00

5.29

1.36

. 9 2

0.00

. 0 5

. 2 1

2.77

3.19

0.00

. 0 1

0.00

0.00

0.00

ATOMS

NOMREKS (100. 0

27.07

0

4

0

2

1

0

0 0

0 6

5 0

3 4

0 0

0 5

1 1

5 0

6 9

0 0

0

C

1

)

OR

A^)

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

IL

TI

RU

AP

CC

MGO/MGOtFF.O

IN FLMCS =

WLUiHT NORM

(100.0)

41.56

0.00

22.86

30.11

0.00

0.00

0.00

1.55

0.00

1.30

0.00

. 5 6

0.00

2.06

0.00

0.00

0.00

0.00

0.00

0.00

. 2 3

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

40.46

0.00

22.95

30.22

0.00

0.00

0.00

0.00

. 4 1

1.33

0.00

4.63

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

. 0 6

MG

TI

p

C/FM

OZ

.05

0.0

0.00

.17

267

3-COMPONENT

WT.PERCENTS

F 28.92

47.46

48.73
TESCHtNITE (POSSIBLY BASOiENT)

15.37N 39.23E, HAMASAT . MASSAKA , ERITREA

E. MANASSL, 1909

SI02

TIO2

AL203

FE2O3

FEO

MNO

MGU

CAO

NA20

K2O

P2O5

H2O*

H2OC02

SO3

ORIGINAL

ANALYSIS

46.20

.76

16.01

.08

.01

• 16

>.O7

r.09

.50

.04

.51

.31

).00

.21

).00

>.00

).00

).00

).00

WATEB-CO2-FREE

(100.0)

47.91

.79

16.60

5.27

7.27

.17

5.26

7.35

6.74

2.12

.53

SI

Tl

AL

F£3

Ft2

MN

Mo

CA

NA

K

P

H*

HC

S

0

ATOMS

WEIGHT

21.58

.46

8.47

3.55

5.45

.12

3.06

5.07

4.82

1.69

.22

.05

0.00

.06

0.00

46.34

ATOMS

NUMBERS (100.0)

17.51

.22

7.15

1.45

2.23

.05

2.87

2.88

4.78

.99

.16

59.72

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

cc

MGO/MGO+FEO

IN FEMICS =

hElGHT NORM

(100.0)

0.00

0.00

12.50

20.61

8.70

19.62

0.00

0.00

0.00

18.97

0.00

0.00

8.63

7.64

0.00

1.49

0.00

0.00

1.15

.50

.68

NON-OXlDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

12.63

14.90

8.79

23.13

0.00

0.00

0.00

19.75

0.00

0.00

17.63

0.00

0.00

1.51

0.00

0.00

1.17

.50

.46

NIGGLl

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

110

22.4

41.4

18.1

18.1

. 1

.4

1.4

.5

.4

-63

3-COHPONENT

WT.PERCENTS

F 47.04

M 19.73

A 33.23

43.61

25.5)1

30. Bl

41.59

13.05

45.36

No. 104

REMARKS: Analcime-natrolite teschenite, from

Hamassa't, Massawa, Eritrea, published in E. Manasse

(1909). See analysis 1041; this rock may belong to the

Cainozoic volcanics.

No. 105

REMARKS: The analyses of Manasse list "loss on

heating, " without separate H~O determinations. MnO and

MINERALOGY: Phenocrysts: Green hornblende, with

katophorite inclusions. Groundmass: Coarse-grained

abundant Mg-rich diopside, frequently rimmed with

hornblende; association of yellow epidote, zoisite and

white mica may have been derived from primitive

feldspar which occurred in minor amount.

OTHER INFORMATION: This rock-type is a local basic

segregation from neighboring quartz-hornblende diorite.

MINERALOGY: Coarsely porphyritic. Phenocrysts:

Kaolinised albite-oligoclase; deeply colored biotite,

sometimes chloritised euhedral, strongly pleochroic

barkevikite, with linearly arranged inclusions of

ilmenite. Groundmass: Abundant pale-green diopside,

plagioclase, biotite, accessory apatite, magnetite,

ilmenite, pyrite; secondary chlorite, calcite, limonite,

leucoxene, yellow epidote, quartz.

No. 106

REMARKS: See under 105.
15.O0N 39.10E,

E. MANASSL. 1909

IDE. KERSANTITE

DERPE vALLEY. SAGAMEITI I

SIU2

TI02

AL203

FE203

FEO

MNO

MGO

CAU

NA20

K20

P2U5

H20*

H20-

C02

S03

Fesa

TOTAL

OKIOI ,MAL

ANALYSIS

48.06

.39

1 i.8O

>.43

J.52

3.00

>.62

3.03

J.37

.04

.44

2.43

0.00

0.00

0,00

.63

0.00

0.00

0.00

100.76

«ATER-C02-FHEE

(100.C)

49.19

.40

17.20

6.58

6.67

0.00

5.75

6.17

5.50

2.09

.45

SI

TI

AL

FE.3

FE2

MN

Mb

CA

NA

K

P

H+

HC

S

ATOMS

WEIGHT

22.45

.23

8.89

4.50

5.07

0.00

3.39

4.31

3.98

1.69

.19

.03

0.00

0.00

0.00

ATOMS

NUMHERS (100.0)

17.91

.11

7.38

1.81

2.04

0.00

3.13

2.41

3.88

.97

.14

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

IL

TI

RU

AB

CC

MGO/MGO-fFEO

IN FEMICS =

WEIGHT NORM

(100.01

0.00

0.00

12.37

30.39

16.02

B.78

0.00

0.00

0.00

9.k9

0.00

0.00

.11.45

9.56

0.00

.76

0.00

0.00

.98

0.00

.75

NON-OX I DAT I UN NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

12.52

23.10

16.22

13.05

0.00

0.00

0.00

10.21

0.00

0.00

23.13

0,00

0.00

.77

0.00

0.00

1.00

0.00

.47

115

23.8

4 5. U

3-COMPONENT

WT.pERCENTs

F 49.85

M 21.63

A 28.52

F 49.07

C 22.85

A 28.08

N 39.96

K 15.18

C 44.87

106

HORNBLENDE PYROxENITE

16.ION 3B.lttE, &HER PLAIN,

E. MANASSE. 19C9

ANSEijA VALLEY» ERITKhA

SIU2

TI02

AL2O3

FE203

FEO

MNO

MGO

CAU

NA20

K2U

P2O5

H2U*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

48.84

1.05

6.30

3.02

5.55

.34

13.69

15.08

2.60

1.08

. .25

1.06

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.66

WATER-C02-FKEE

(100.0)

48.94

1.05

8.32

3.03

5.56

.34

13.72

15.11

2.61

1.08

.25

SI

TI

AL

Ft3

FE2

MN

Mb

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

22.82

.63

4.39

2.11

4.31

.26

8.26

10.78

1.93

.90

.11

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

17.91

.29

3.59

.84

1.71

.11

7.50

5.93

1.85

.51

.08

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

QL

MT

m

IL

TI

RU

AP

CC

MGO/MGOtf-EO

IN FEMICS =

WLIGHT NDR M

(100.0)

0,00

0.00

6.41

7.01

7.77

8,16

0.00

0.00

0.00

52.23

0.00

0.00

11. 4R

4.40

0.00

2.00

0,00

0.00

.55

0.00

.87

NON-OX I DAT I ON NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

6.44

3.54

7,81

10.11

0.00

0.00

0.00

53.32

0.00

0,00

16.21

0.00

0.00

2.01

0.00

0.00

.55

0,00

.77

c

ALK

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 33.04

M 52.78

A 14.19

F 31.36

C 55.18

A 13.47

N 13.86

K 5.76

C 80.38
107

HORNRLENbL uIOFUTt

16.09.1 3B.17E, YAwIT-iHlTA,.,,) vALLtY, RRI&ANT1A, ERITREA

t.MAUASSt, 190",

SI02

TI02

AL2O3

FE2O3

FEO

MNU

MGO

CAO

NA2O

K,?O

P2U5

H2O*

H20-

CO2

S03

TOTAL

OKICI ;*L

ANALYSIS

51.02

.72

17.81

3.75

6.17

.IB

5.30

8.9fl

i. PI

1.01

.72

1.4R

U.OO

0.00

0.00

0.00

0.00

0.00

0.00

100.95

6.20

.18

5.33

SI

Tl

AL

FE.3

Ffc2

ATOMS

WEIGHT

23.84

.43

9.42

2.62

4.80

ATOMS

NUMBERS (100.0)

0

CR

OS

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H'-I

IL

T(I

RU

AP

HEIGHT f.Okh

(100.0)

0.00

0.00

6.01

32.48

2b.62

0.00

0.00

0.00

0.00

9.75

0.00

11.28

3.43

5.48

0.00

1.37

0,00

0.00

1.58

0.00

NON-OX IDAT IUN NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

6.06

32.71

28.83

0.00

0.00

0.00

0.00

10.07

0.00

4.24

15.11

0.00

0.00

1.38

0.00

0,00

1.59

0.00

N1GGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

126

25.9

39.6

23.8

10.7

.1

.4

1.3

.7

• 6

-17

In FEMICS =

3-COMPONENT

WT.pERCENTS

F 49.50

M 26.45

A 24.0>>

F 41.82

C 37.86

A 20.32

N 27.61

K 7.3?

C 65.07

No. 107

REMARKS: See under 105.

MINERALOGY: Medium grained. Groundmass: Fresh

or intensely epidotised andesine-labradorite; hornblende,

with plagioclase inclusions, in contorted and rotated

crystals; uncommon chloritised mica; accessory large

apatite, very rare quartz, ilmenite and leucoxene, all

showing effects of stress; common epidote.

No. 108

REMARKS: See under 105.

MINERALOGY: Very fine-graind, aphyric. Groundmass: Albite and slightly altered lepidomelane (both with

euhedral tendency), common apatite, rare anatase,

secondary chlorite, ilmenite, limonite.

OTHER INFORMATION: This rock-type occurs as a

sheet intrusion in granite.

No. 109

REMARKS: See under 105.

MINERALOGY: Phenocrysts: Slightly altered An60 with

rare diopside inclusions, uralitised pyroxene.

Groundmass: Fine-grained andesine-labradorite, colourless diopside associated with secondary(?) blue-green

amphibole, fairly common chloritised coloured mica,

abundant magnetite, uncommon ilmenite, apatite, rare

quartz. No alkali feldspar observed, despite high ^ O

content in analysis.

OTHER INFORMATION: Sheet intrusion in quartzdiorite massif.
108

KER5ANTITL

15.26N 38.48E,

E. MANASSE. 1909

HANDELiA, S.E. OF KEREN, ERITREA

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2U5

H20*

H20-

C02

SOS

TOTAL

ORIGINAL

ANALYSIS

51.26

.76

16.90

6.11

5.32

.15

2.59

2.96

6.86

2.28

1.59

4.07

0.00

0.00

0.00

0.00

0.00

0.00

0.00

1U0.B5

WATER-C02-FREE

(100.0)

52.97

.79

17.46

6.31

5.50

.15

2.68

3.06

7.09

2.36

1.64

SI

TI

AL

FE3

F£2

MN

MG

CA

NA

K

P

ATOMS

WEIGHT

23.95

8

4

4

1

2

5

1

46

94

27

14

12

56

12

09

89

69

ATOMS

NUMBERS (100.0)

19.04

4

1

.21

.40

.71

.66

.05

.44

.18

.94

.08

.50

Q

CB

OR

AFi

AN

NE

LC

AC

NS

DI

wo

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FLO

IN FEMCS =

WEIGHT IMOPM

(100.0)

0.00

1.19

13.95

54.16

5.53

3.22

0.00

0.00

0.00

0.00

0.00

0.00

7.68

9.1R

0.00

1.49

0.00

0.00

3.59

0.00

.69

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

1.21

14.12

47.46

5.60

7.25

0.00

0.00

0.00

0.00

0.00

0.00

19.21

0.00

0.00

1.51

0.00

0.00

3.64

0.00

.32

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

149

29.

38.

9.

23.

1.

1.

3-COMPONENT

WT.PERCENTS

F 49.3b

M 11.In

A 39.46

F 48.58

C 12.5a

A 38.84

N 56.69

K 18.84

C 24.46

109

PYROXtNE I ICKOblORlTT

16.00U 38.18F:, MAI AbAkTE,

E. MANASSL. 1909

•lOLEhSO. ERITREA

SI 02

TI02

AL2O3

FE2O3

FFO

MNU

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

503

TOTAL

OklGIMAL

ANALYSIS

54.18

.76

15.33

•j.fc5

6.30

0.00

3.28

7.77

3.96

2.32

.72

.47

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.74

WATER-C02-FKEE

(100.0)

54.03

.76

15.29

5.63

6.28

0.00

3.27

7.75

3.95

2.31

.72

SI

TI

AL

Ft3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

25.31

.46

8.11

3.95

4.90

0.00

1.98

5.55

2.94

1.93

.31

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

19.68

6

1

1

0

1

3

2

1

21

56

55

92

00

78

02

79

08

22

0

CB

OR

AS

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO»F£O

IN FEMICS =

WEIGHT NORM

(100.0)

3.51

0.00

13.70

33.49

17.10

0.00

0.00

0.00

0.00

14.06

0.00

6.93

0.00

R.19

0.00

1.44

0.00

0.00

1.57

0.00

.66

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

13.85

33.85

17.29

0.00

0.00

0.00

0.00

14.79

0.00

9.77

7.41

0.00

0.00

1.45

0.00

0.00

1.59

0.00

.36

3-COMPONENT

WT.PERCENTS

F 55.56

M 15.25

A 29.20

F 45.96

C 79.88

A 74.15

N 28.19

K 16.51

C 55.30
110

PORPHYRITIC HUkN--.LE.NtE -;ICRODl OR I TE

14.10IM 39.04E. AZtO* SAc.AI-it I TI . EKllKEA

E. MArtASSt . 1909

SI02

TIu2

AL2O3

FE2O3

FFu

MNu

MGO

CAu

NA2O

K2O

P2O5

H2-J*

H2UCO2

SO3

TOTAL

ORIGIMA L

54.21

.tz

15.11

3.94

5.25

0.00

6.42

S.19

3.96

1.91

.14

1.28

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.93

TEW—C02—FKEE

(lon.o)

.40

.52

.16

.95

.27

.00

.44

.22

.97

.92

.14

SI

Tl

AL

FL3

FL2

Mft

Mb

CA

NA

K

P

H*

Hc

s

ATOMS

rtElGHT

25.33

.31

7.99

2.76

4.08

0.00

3.87

5.85

2.94

1.59

.06

.02

0.00

0.00

0.00

ATOMS

NUMBERS (100.0

19.57

6

1

1

0

3

3

2

14

43

07

59

00

46

17

77

88

04

0.00

0.00

11.35

33.fc9

17.1-3

0.00

0.00

o.no

o.oo

1 7 .1 2

0.00

10.14

2.13

5.75

0.00

.99

0.00

0.00

.31

0.00

NON-OX I DAT I ON NORM

(FE2O3 COnVPKTEU TO FEO)

0.00

0.00

11.44

33.95

17.96

0.00

0.00

0.00

0.00

18.47

0.00

2.89

13.99

0.00

0.00

1.00

0.00

0.00

.31

0.00

.59

3-COMPONtNT

WT.PtRCENTS

F 42.78

M 29.89

A ?7.33

F 39.53

C 15.23

A 25.25

N ?8.17

K 13.58

C 58.25

NO. 110

REMARKS: See under 105.

MINERALOGY: Phenocrysts: Large pseudomorphs of

zoisite and white mica after feldspar; zoisite forms the

centre of the crystals, and is more abundant than white

mica forming the periphery, indicating a calcic plagioclase. Groundmass: Fine-grained fresh andesinelabradorite, no alkali feldspar, abundant euhedral Fe -

poor hornblende, uncommon quartz granules, intensely

pleochroic biotite; accessory ilmenite, leucoxene,

haematite, apatite, epidote, zoisite; secondary quartz.

OTHER INFORMATION: Occurs as lenses in schists.

No. Il l

REMARKS: See under 105. TiO2 trace .

MINERALOGY: Reported identical with specimen in

analysis 114.

OTHER INFORMATION: This rock-type cut by aplites.

No. 112

REMARKS: See under 105- TiO2 trace .

MINERALOGY: Coarse-grained. Groundmass: Large

tabular An30-40, pink-green hornblende, rather

uncommon anhedral quartz; accessory apatite, ilmenite,

titanite; secondary epidote, zoisite.
HORNDLENDL-blUTlTE-QuART

14.50N 39.20E. ,

E. MAWASSt. 1909

ADI ..AI. ERITREA

sro2

TI02

AL203

FE2O3

FEO

KNO

MGG

CAU

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORId : AL

ANALYSI!

5o .e?

0.00

18.85

5.05

2.90

.16

2.76

5.45

<t.eo

2.07

.38

1.62

0.00

0.00

0.00

0.00

0.00

0.00

o.oo

100.116

wATER-C02-Fi<tE

(100.0)

57.26

0.00

18.99

5.09

2.09

.38

51

TI

AL

FL3

FL2

MN

MG

CA

N«

K

P

H+

H -

c

s

ATOMS

HEIGHT

26.55

0.00

9.97

3.53

2.25

.12

1.66

3.90

3.56

1.72

. 1 7

. 0 2

0.00

0.00

0.00

ATOMS

NUMBERS (100. 0

20

0

7

1

1

2

3

1 0

0 0

9 4

3 6

8 7

0 5

4 7

0 9

3 3

9 4

12

wfclGMT fiO^M

(100.0)

5.60

U.OO

12.36

41.02

23.90

U.CJ O

0.00

0.00

0.00

. 9 1

0.00

7.97

0.00

7.40

0.00

0.00

0.00

o.co

NON-OX 1 OATI UN NORM

(FE2O3 CONVERTED TO FEO)

.23

0.00

12.48

41.42

24.14

0.00

0.00

0.00

0.00

.98

0.00

19.90

0.00

0.00

0.00

0.00

0.00

0.00

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

170

33.2

31.4

17.5

17.9

.12

.39

0.0

.48

.56

- 2

3-COMPONENT

yT.PERCSNTS

F 45.22

M 15.70

A 39.OH

F 39.22

C 26.89

A 33.89

N 36.96

K 16.80

C 44.24

MGU/MGC-t-hFO

IN HEMC 5 =

112

HORNBLENDE OUAfcTZ

16.02K 38.1JE,

F. MANASSt, l'V09

5102

TI02

AL-iO3

FE2O3

FEO

MNo

MGO

CAO

NA2O

K2U

P2Q5

H20 +

H20-

COi

S03

TOTAL

OKICJ'Wl

ANALYSI!

57.51

0.00

15.88

3.50

3.71

.17

4.48

9.16

3.70

1.27

.29

l.? l

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.88

HATER-C02-FREE

(100.0)

57.70

o.oo

15.93

3.51

9.19

3.71

SI

TI

AL

Ffc3

FE2

MM

MG

CM

NA

K

P

H-t

H -

C

5

ATOMS

WEIGHT

26.87

0.00

8.40

2.45

2.88

.13

2.70

6.55

2.75

1.05

.13

. 0 1

0.00

o.oo

0.00

ATOMS

NUMBERS (100.0 )

20.56

0.00

6.69

. 9 4

1.11

. 0 5

2.39

3.51

2.57

. 5 8

. 0 9

Q

C 1

OR

A^

AN

NE

LC

AC

NS

D I

WO

HY

OL

MT

H.t

IL

TI

RJ

AP

CC

MfiO/MCiOi-HJU

IN EthlCS -

WtlGHT "10RH

(100.0)

7.99

0.00

7.5 5

31.48

23.01

0.00

0.00

0.00

0.00

16.87

0.00

7.38

0.00

5.10

0.00

0.00

0.00

0.00

. t.A

0.00

.7*.

NON-0

(FE2O3

4.31

0.00

7.60

31.69

23.16

0.00

0.00

0.00

0.00

17.54

0.00

15.06

0.00

0.00

0.00

0.00

0.00

0.00

.64

0.00

.54

NON-OXIDATION NORM

(FE2O3 CONVFKTED TO FEO)

159

25.9

27.2

1 2 . i.

.53

0.0

3-COMPONENT

WT.PERCENTS

F 43.?H

33.7S)

42.92

23.24

26.19

8.99

64.83
HORNBLENDE uRANITt" ar{)t.RJ/_ i..IORITL«

15.37U 38.45E, ,-iAl .|A|_ I -H.AKET. ERITREA

E. MA.NASSL, 1909

SIU2

TIJ2

AL2O3

FF.2O3

FEO

MUG

M3U

CAO

NA2O

K2U

P2U5

H2O»

H2UC02

S03

TOTAL

Ar.ALYSI

bH.67

0.00

17.68

2.21

3.R5

0.00

3.28

4.ft2

5.K6

3.27

.57

.49

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.70

WATER-C02-FREE

(100.0)

58.55

0.00

17.64

2.21

3.84

0.00

3.27

4.81

5.B5

3.26

.57

SI

TI

AL

Fh3

Ft2

MN

M(j

CA

NA

K

P

Ht

Hc

s

ATOMS

WEIGHT

27.41

0.00

9.35

1.55

2.99

0.00

1.98

3.44

4.35

Z.71

.25

.01

0.00

o.oo 0.00

ATOMS

NUKBEK5 (100.0)

20.65

0

7

1

0

1

1

4

1

00

34

59

14

00

72

82

00

47

17

0

CH

OR

AB

AN

NH

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

ccMGO/MGO+FEO

IN FEKICS =

WEIGHT NORM

(100.0)

0.00

0.00

19.33

49.59

12.1H

0.00

0.00

0.00

0.00

6.84

0.00

.96

b.65

3.21

0.00

0.00

0.00

0.00

1.24

0.00

.67

NON-OXIDATION NORM

(FE203 CONVFHTED TO FfcO)

0.00

0.00

19.41

47.82

12.23

1.07

0.00

0.00

0.00

7.03

0.00

0.00

11.18

0.00

0.00

0.00

0.00

0.00

1.25

0.00

.51

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

32.81

17.76

49.43

30.28

24.09

45.63

42.01

73.44

34.55

No. 113

REMARKS: See under 105. TiO2 trace.

MINERALOGY: Cataclastic structure. Groundmass:

Large fresh An20-25, subordinate microcline (no

orthoclase), rather uncommon quartz, equally common

biotite and hornblende; accessory titanite, large apatite,

rare zircon, epidote, titaniferous magnetite.

OTHER INFORMATION: Basic segregation from granite

massif.

No. 114

REMARKS: See under 105. CO, trace.

MINERALOGY: Groundmass: Large altered oligoclaseandesine (secondary zoisite, white mica, and rarer

epidote and calcite), very subordinate kaolinised alkali

feldspar, rather uncommon rounded quartz, hornblende

commoner than dark mica, both now chloritised;

accessory apatite, ferro-titanite, leucoxene.

No. 115

REMARKS: See under 105. MnO and CO2 traces.

MINERALOGY: Porphyritic texture, with fluidal

groundmass. Phenocrysts: Altered plagioclase (proportions of zoisite-white mica suggest rather calcic).

Groundmass: Extremely fine-grained fresh K-feldspar.

green hornblende, quartz, apatite very rare ilmenite

with leucoxene rims; secondary epidote, calcite,

muscovite, chlorite, titanite.

OTHER INFORMATION: Occurs within a hornblendediorite massif.
HORNBLENDt-BlOTITt-QuART7 nIORITt

14.42N 38.54E. ADI ;;ARI;], N.E. OF DIGSA.

E. MANASSE, 1909

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20+

H20-

C02

503

TOTAL

ORIGINAL

ANALYSIS

58.67

.19

16.21

4.17

3.54

.15

3.19

6.29

5.09

1.89

.25

1.29

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.93

k»ATER-C02-FKEE

(100.0)

5S.66

.19

16.27

4.19

3.55

.15

3.20

6.31

5.11

1.90

.25

Si

Tl

AL

Ft3

Ft2

MN

MO

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

27.41

.11

8.58

2.92

2.75

.12

1.92

4.50

3.78

1.57

.11

.02

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

20.91

.05

6.81

1.12

1.06

• 05

1.70

2.40

3.52

.86

.08

0

C3

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

II

Tl

RU

AP

CC

MGd/MGO-ff-EU

IU FEt-;ICS -

WEIGHT flOHM

(100.0)

5.72

0.00

11.24

43.32

15.80

0.00

0.00

0.00

0.00

11.35

0.00

5.58

0.00

6.0K

0.00

.36

0.00

0.00

.55

0.00

.7(1

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

1.31

0.00

11.33

43.67

15.93

0.00

0.00

0.00

0.00

11.96

0.00

14.88

0.00

0.00

0.00

.36

0.00

0.00

.55

0.00

.45

c

ALK

3-COMPONENT

WT.PERCENTS

F 43.1?

M 17.84

A 39.04

F 36,75

C 29.98

A 33.27

N 38.36

K 14.24

C 47.40

115

/•ALCHITE

16.0914 38.1&E,

E. MANASSt. 1909

S. BURI.ER ,,HLR ,-LAlN, ANSEyA VALLEY, ERITREA

SI02

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K2O

P2O5

H2O+

H2OC02

S03

TOTAL

ANALYSIS

60.96

.45

16.24

2.50

3.52

0.00

2.69

5.77

5.13

2.48

.09

1.10

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.93

cATEK-C02-FKtE

(100.0)

61.06

.45

16.27

2.50

3.53

0.00

2.69

5.78

5.14

2.48

.09

SI

Tl

AL

FE3

FE2

MN

MCJ

CA

NA

K

P

H+

Hc

s

ATOMS

WEIGHT

28.48

.27

8.59

1.75

2.74

0.00

1.62

4.12

3.81

2.06

.04

.01

0.00

0.00

0.00

ATUMS

NUMBERS (100.0)

21.55

.12

6.77

.67

1.04

0.00

1.42

2.19

3.52

1.12

.03

0

C3

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

Tl

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

WEIGHT NORM

(100.0)

6.72

0.00

14.72

43.58

13.93

0.00

0.00

0.00

0.00

11.60

0.00

4.77

0.00

3.64

0.00

.86

0.00

0.00

.20

0.00

.71

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

4.09

0.00

14.79

43.79

13.99

0.00

0.00

0.00

0.00

12.02

0.00

10.26

0.00

0.00

0.00

.86

0.00

0.00

.20

0.00

.48

SI

AL

FM

C

ALK

195

30.7

28.4

19.9

21.1

3-COMPONENT

WT.PERCENTS

F 36.89

M 16.48

A 46.63

F 31.03

C 29.74

A 39.23

N 38.34

K 18.54

C 43.1?
116

MALCH1TE

14.42N 39.0bE. AMtiA KEFUD, SAGANEITI , ERITKEA

E. MANASSL. 1909

S102

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

SO3

TOTAL

0

CB

OR

An

AN

NE

LC

AC

NS

Dl

WO

HY

OL

t«T

HM

IL

TI

PL.1

AP

ccMGO/MGO*nO

IN FEMICS =

Oi161 NAL

ANALYSIS

6

1

.90

J.OO

r.2o

.90

.71

j.oo

>.B2

«.44

i.e?

>.9O

J.OO

.89

).00

.92

J.OO

J.OO

j.oo

• 00

J.OO

101.50

HEIGHT MOPM

(100.0)

15.88

1.63

17.43

32.86

16.48

o.oo 0.00

0.00

0.00

0.00

0.00

lO.f-0

0.00

2.80

0.00

0.00

0.00

0.00

0.00

2.13

.73

wATER-C02-FKtE

(100.0)

63.36

0.00

17.61

1.94

2.77

0.00

2.89

4.54

3.91

2.97

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

13. 89

1.84

17.49

32.98

16.54

0.00

0.00

0.00

0.00

0.00

0.00

15.12

0.00

0.00

0.00

0,00

0,00

0,00

0.00

2.14

.54

SI

TI

AL

FE3

Ft2

MN

MG

CA

NA

K

P

H*

HC

S

0

ATOMS

«ElGhT

28.92

0.00

9.10

1.33

2.11

0.00

1.70

3.17

2.83

2.41

0.00

.03

0.00

.25

0.00

49.64

NIGGLI

SI

1

^L

"M

kLK

1G

I

./FM

oz

ATOMS

NUMBERS

22.16

0.00

7.26

.51

.fi l

0.00

1.51

1.70

2.65

1.33

0.00

62.07

218

35.

27.

16.

19.

0.

0.

33

53

0

00

60

39

(100.0)

3-COMPONENT

WT.PERCENTS

F 32.56

M 9.93

A 47.49

F 29.?3

cA '

N

K

C

8.15

.2.61

4.23

>5.99

19.7B

D.I. 62.0>>

No. 116

REMARKS: See under 105. TiCu, MnO,

 P 2° s traces;

rather weathered specimen

MINERALOGY: Phenocrysts: scarce chloritised

amphibole and altered oligoclase. Groundmass: Dominantly sodic plagioclase microlites; some quartz, Kfeldspar(?); secondary zoisite, calcite, muscovite,

magnetite.

No. 117

REMARKS: See under 105. MnO trace.

MINERALOGY: Granophyric texture. Phenocrysts:

Rather uncommon orthoclase (cryptoperthite), irregularly

distributed quartz grains. Groundmass: Micropegmatitic

intergrowth of quartz and orthoclase in equal proportions,

some slightly kaolinised albite with accreted orthoclase

rims, chlorite laths (after mica?); accessory apatite,

zircon; secondary abundant yellow epidote, some calcite,

leucoxene.

OTHER INFORMATION: Associated with aplite 121.

No. 118

REMARKS: See. under 105.

MINERALOGY: Phenocrysts: Corroded quartz (rare

euhedral crystals), less corroded An20-25, coloured

mica (with primary chloritisation) in proximity to quartz

phenocrysts. Groundmass: Very fine-grained

granophyric quartz and kaolinised alkali feldspar; subordinate chloritised mica and magnetite; secondary

epidote, muscovite, quartz.

OTHER INFORMATION: Sheet intrusion in Aratu granite.
117

ADA^ELLITt

15.17N 39.20E,

E. MANASSE, 1909

ADI SAtLI , SHA;,EL>I-ALlGHEDI CONFLUENCE, ERITREA

5102

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

70.04

0.00

15.91

1.41

1.79

0.00

.42

1.24

5.44

3.62

.11

.96

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.94

WATER-C02-FREE

(100.0)

70.05

0.00

15.91

1.41

1.79

0.00

.42

1.24

5.44

3.62

.11

SI

Tl

AL

Ft3

FE2

MN

MG

CA

NA

K

P

H*

HC

5

ATOMS

WEIGHT

32.72

0.00

8.42

.99

1.39

0.00

.25

.89

4.04

3.00

.05

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

24.16

0.00

6.47

.37

.52

0.00

.22

.46

3.64

1.59

.03

Q

CB

OR

AB

AN

NE

LC

AC

NS

01

wo

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGU*FEO

IN FEMICS =

*E1GHT NORM

(100.0)

20.40

.99

21.46

46.16

5.52

0.00

0.00

0.00

0.00

0.00

0.00

3.18

0.00

2.05

0.00

0.00

0.00

0.00

..24

0.00

.39

NON-OX IOAT ION NORM

(FE203 CONVERTED TO FEO)

18.96

1.00

21.52

46.29

5.54

0.00

0.00

0.00

0.00

0.00

0.00

6.46

0.00

0.00

0.00

0.00

0.00

0.00

.24

0.00

.20

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

325

43.6

14. H

6.2

35.3

.30

.20

0.0

.22

.42

84

3-COMPONENT

WT.PERCENTS

F 25.24

23.70

9.19

67.11

52.82

35.15

12.0*

16.00N 38.1BE,

E. MANASSE.. 1909

MAI A&ARTE, ARATU. MOLEBSO, ERITREA

SI02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S(53

TOTAL

ORIGINAl

ANALYSIS

73.56

0.00

14.06

1.02

.77

0.00

• 46

2.14

5.08

3.00

.09

.75

0.00

0.00

0.00

0.00

0.00

O.OO

0.00

100.93

WATER-C02-FREE

73.43

0.00

14.03

1.02

.77

0.00

.46

2.14

5.07

2.99

.09

(100.0)

SI

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

•EIGHT

34.37

0.00

7.44

.71

.60

0.00

.28

1.53

3.77

2.49

.04

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.16

0.00

5.67

.26

.22

0.00

.23

.78

3.37

1.31

.03

0

C8

OR

A?

AN

NE

LC

AC

NS

DI

WO

HY

OL

f«T

H«

IL

TI

RU

AP

CC

MGO/MGO*H:.O

IN FEMICS r

WEIGHT NORM

(100.0)

27.76

0.00

17.75

43.02

6.63

0.00

0.00

0.00

0.00

2.81

0.00

.36

0.00

1.48

0.00

0.00

0.00

0.00

.?0

0.00

.72

NON-OX I DATI ON NORM

(FE2O3 CONVERTED TO FEO)

26.73

0.00

17.78

43.11

6.64

0.00

0.00

0.00

0.00

2.97

0.00

2.57

0.00

0.00

0.00

0.00

0.00

0.00

.20

0.00

.34

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

UZ

376

42.4

10.8

11. a

35.1

.28

.33

0.0

.20

1.09

136

3-COMPONENT

WT.PERCENTS

F 17.33

M 4.45

A 78.22

F 14.90

C 17.82

A 67.2R

N 49.71

K 29.35

C 20.94
119

PIOTITE uhANlTfc

15.46N 36.27E, CO|. OF v EKFN FORT, ERITREA

E. MANASSL, 1909

SI02

TI02

AL2O3

FF2O3

FEO

MNO

MGU

CAO

NA2O

K2O

P2O5

H2U*

H2QC02

S03

TOI AL

ANALYSIS

73.96

0.00

13.75

• b2

.99

0.00

.48

1.90

5.62

2.55

.17

.25

0.00

0.00

o.co

0.00

0.00

0.00

0.00

100.19

TER-C02-Fi<tE

(100.0)

.00

.00

• 76

.52

.99

.00

.48

.90

.62

.55

.17

SI

Tl

AL

Ft3

Ft2

MN

MG

CA

NA

<

P

Ht

HC

S

ATOMS

WEIGHT

34.55

0.00

7.28

.36

.77

0.00

.29

1.36

4.17

2.12

.07

.00

0.00

0.00

0.00

ATOMS

NUMHERS (100.0

25.28

0.00

5.54

.13

.28

0.00

.24

.70

3.73

1.11

.05

0

CB

OR

AB

AN

NE

LC

AC

N5

PI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MQO/MC,O*FL:O

I ft FtMC S s

wElLHT NORM

(100.0)

27.18

0.00

15.12

47.71

4.70

0.00

0.00

0.00

0.00

3.13

0.00

1.04

0.00

.76

0.00

0.00

0.00

0.00

.37

0.00

.53

NON-OXIOATION NORM NI

(FE203 CONVERTED TO FEO)

26.65 SI

0.00 AL

15.14 f

47.76 (

4.70 /

0.00 H

0.00 !*

0.00 1

0.00 F

3.19 C

y

»L

1G

I

./

0.00 OZ

2.18

0.00

0.00

0.00

o.oo

0.00

0.00

.37

0.00

.38

3-COMPONFNT

WT.PEHCENTS

F 14.86

M 4.72

A HO.41

t 13.04

C 16.41

A 70.55

N 55.81

K 25.32

C 18.H7

No. 119

REMARKS: See under 105, except that H,O is listed as

such for 119. TiO, trace.

MINERALOGY: Medium grained. Groundmass: Microcline, with very subordinate orthoclase, abundant subhedral, zoned albite-oligoclase (fresh, with inclusions

apatite, biotite, hornblende, quartz, microcline); quartz,

with undulose extinction (inclusions of apatite, zircon);

chloritised and epidotised biotite. Accessory fresh

muscovite; orthite with mantle of clinozoisite passing out

to rim of epidote; titanite, both secondary in biotite and

primary; apatite (two generations). Secondary epidote,

ilmenite and leucoxene.

No. 120

REMARKS: See under 105. No separate determination of

FeO; P2°5 trace.

MINERALOGY: Fine-grained leuco-granite. Groundmass:

Fresh microcline dominant over zoned(?) albiteoligoclase, subordinate quartz (liquid inclusions), scarce

muscovite; accessory altered biotite, titanite, apatite,

zircon.

OTHER INFORMATION: Extensive intrusion underlying

the Mesozoic sandstones.

No. 121

REMARKS: See under 105.

 p

2 ° 5

 an d CO2 traces

-

MINERALOGY: Very fine-grained. Groundmass:

Cryptoperthite and chloritised mica occur separated

from quartzitic-textured quartz (rose-coloured); subordinate albite; secondary epidote, titaniferous magnetite,

calcite.

OTHER INFORMATION: Associated with adamellite 117,

and is the most silicic facies of a huge granodiorite

massif.
120

MUSCOVITE GKANITF

14.33N 38.46E, ADI ENFN ADI rjUALA,

E. MAnlASSt, 19C9

SI02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H20-

CO2

SO3

TOTAL

ANALYSIS

74.19

0.00

13.55

• 46

0.00

0.00

• 28

.94

5.68

4.82

0.00

.40

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.32

WATER-C02-FREE

(100.0)

74.25

0.00

13.56

.46

SI

Tl

AL

Ft3

FE2

MN

Mo

CA

MA

K

P

H*

HC

s

ATOMS

WEIGHT

34.66

0.00

7.17

.32

0.00

0.00

.17

.67

4.21

4.00

0.00

.00

0.00

0.00

0.00

ATOMS

NUMHERS (100.0)

25.39

0.00

5.47

.12

0.00

0.00

.14

.34

3.77

2.11

0.00

0

CB

OR

At!

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU"

AP

CC

MGO/MGO + I-LO

IN FtMCS =

WEIGHT fiOHM

(100.0)

2 3.66

0.00

28.59

42.86

O.CJO

0.00

0.00

1.34

.90

1.51

1.14

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

23.89

0.00

28.62

42.90

0.00

0.00

0.00

0.00

1.25

2.80

.54

0.00

0.00

0.00

0.00

0.00

0,00

0.00

0.00

0.00

.57

TI

/FM

0.0

0.00

3-COMPONENT

WT.PERCENTS

F 4.09

M 2.49

A 93.42

F 3.87

49.65

4 2. 13

8.22

121

APLIT1C GRANITE

14.58N 39.14E,

F. MANASSt, 1909

DlGSA, E.RITRL.A

SI02

TI02

AL2O3

FE2O3

FFO

MNO

MGO

CAO

NA20

K2C

P2O5

H20 +

H20-

C02

S03

TOTAL

URIC I ./>

AhALYal

74.36

0.00

13.56

.67

1.19

0.00

.29

.89

4.51

4.93

0.00

1.01

0.00

0.00

0.00

0.00

0.00

0.00

0.00

101.41

*ATER-C02-FKEE

(100.0)

74.06

0.00

13.51

.67

1.19

0.00

.29

.89

4.49

4.91

0.00

51

Tl

AL

FE3

FE2

MN

MG

CA

NA

H»

ATOMS

HEIGHT

34.74

0.00

7.17

.47

.92

0.00

.17

.64

3.35

4.09

0.00

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.48

0.00

5.48

.17

• 34

0.00

.15

.33

3.00

2.16

0.00

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

wo

HY

OL

MT

H*

IL

TI

RU

AP

CC

MGO/MGOtFEO

IN FEMICS =

HEIGHT NORM

(100.0)

26.39

0.00

29.10

38.11

2.11

0.00

0.00

0.00

0.00

1.95

o.oo 1.36

0.00

.97

0.00

0.00

0.00

0.00

0.00

0.00

.37

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

25.72

0.00

29.14

3R.16

2.12

0.00

0.00

0.00

0.00

1.99

o.oo 2.87

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.23

SI

AL

FM

cALK.

<

MG

Tl

P

C/FM

OZ

403

43.4

10.5

5.2

40.9

.42

.22

0.0

o.oo .49

140

3-COMPONENT

WT.PERCENTS

F 16.05

M 2.50

A R1.45

F 15.2ft

C 7.30

A 77.44

N 43.66

K 47.73

C 8.62
122

APLITL

15.00N 39.12E, b. OF J.

F. MA,<AS5L. 1909

SIo2

TIU2

AL^03

FE2O3

FFO

MNO

MGO

CAO

NA2O

<2u

P2U5

H7u*

H2OCO2

SO3

TOTAL

AflALYSI

77.39

0.00

13.16

• f 1

0.00

0.00

0.00

. 7 5

3.1,1)

4.3?

0.00

• 70

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.73

AATER—CO?—FrtEE

(100.0)

77.37

0.00

13.16

.81

0.00

0.00

0.00

.75

3.60

4.32

0.00

SI

TI

AL

Ft 3

Ft2

MN

Mi

CA

NA

<

p

H»

h -

C

5

ATOMS

HEIGHT

36

0

6

0

0

0

2

3

0

0

0

0

16

0 0

. 9 6

5 7

0 0

0 0

0 0

5 4

6 7

5 9

0 0

0 1

0 0

0 0

0 0

ATOMS

NIMHERS (100. 0

26.41

0.00

5.29

. 7 1

0.00

0.00

0.00

. 2 7

2.38

1.88

0.00

0

CH

OS

AR

AS

NE

LC

AC

NS

DI

WO

HY

OL

i»T

H i

IL

TI

RJ

Acer.

vGU/t-iGO + l LJ

I * Ftl ICS =

/.OICJHT MOIIi

(100.0)

36.15

1.17

2b.hO

30.54

3.73

0.00

0.00

0.00

0.00

0.00

i).no

O.PO

0.00

0.00

• f.l

0.00

o.co

0.00

0.00

O.OO

0.00

NON-OX I DAT I UN NORM

(FE?03 CONVFKTFD TO FEO)

37.66

1.17

25.64

30.59

3.74

0.00

0.00

0.00

0.00

0.00

0.00

1.21

0.00

0.00

0.00

0.00

0.00

0.00

0.00

o.oo

o.oo

NIGGLI

SI

AL

FM

c

ALK

K

MG

T I

P

C/FM

Q7

5 0 1

50.i

4 .

5 .

4 0 .

0 .

0 .

0 .

1 .

0

4 4

0 0

0 0

i?

? 3 9

3-COMPONFNT

wT.PEkCENTS

F

M

A

F

C

A

N

K

C

D.I.

9.78

0.00

90.72

8 .

7 . *

R 3 .

41."

49. f

B .t

4

) |

>4

>?

>*>

100.00

No. 122

REMARKS: See under 105. No separate determination of

FeO; MgO and P2°5

 traces

-

MINERALOGY: Very fine-grained, rose coloured rock.

Groundmass: Granophyric aggregate of feldspar and subordinate quartz; altered microcline is dominant over

orthoclase and fresher albite; scarce muscovite; accessory apatite, pyrite.

No. 123

REMARKS: See under 105. P2 °5

 trace

-

MINERALOGY: Phenocrysts: Large corroded quartz

(with undulose extinction, rare liquid inclusions),

kaolinised albite. Groundmass: Quartz with fluidal

arrangement of albite(?) microlites; accessory white

mica, pleochroic chlorite, very minute magnetite;

secondary epidote, zoisite, ilmenite, leucoxene, limonite.

OTHER INFORMATION: This rock-type passes into

metamorphosed and kaolinised porphyroid rock, which has

been incompletely analysed as follows: SiO, 81.29%,

A12O3 11. 59%, total Fe2O3 0. 39%, MgO 0. 26%,

CaO 0. 15%, total alkalis 0. 28%, loss on heating 5. 87%,

total 99.83%.

No. 124

REMARKS: See under 105. P2O trace.

MINERALOGY: Groundmass: Large pleochroic hornblende crystals with inclusions of feldspar and quartz;

modest aggregates of altered andesine and subordinate

quartz; accessory mica, secondary magnetite, rare

apatite.

OTHER INFORMATION: The extreme melanocratic

facies of a dioritic magma.
123

POHPHYRITlc uUPI<T

15.10ii 38.54c.

E. MAUASSL, 1909

Kf HA Tof' ,Yi'i

MAPAIAI.O, S. 01 ASMARA, ERITREA

SIU2

TI02

AL2O3

FF.2O3

FEU

MNJ

MGO

CAO

NA2O

K2O

P2J5

H2U*

H2OC02

SO3

TOTAL

ANALYSIS

77.fc3

0.0 0

10.7 9

2.3 5

1.1 6

0.0 0

.33

.19

5.6 1

.F8

0.0 0

• 6 7

0.0 0

O.CO

o.oo

o.oo

0.00

0.00

o.oo

99.H

7S.D1

0.00

10.8b

0.00

.33

.19

SI

Tl

AL

Ft3

FE2

MN

MG

CA

NA

-f*

-iATOM S

(.EIGH T

36.36

0.00

5.71

1.64

.90

0.00

.20

.14

4.1b

.73

0.00

.01

0.00

0.00

0.00

ATOMS

NUi'ihER S (100. 0

26.7 2

0.0 0

4.3 7

.61

.33

o.oo

.17

.07

3.74

.39

0.00

0

CT

OR

AR

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H'l

II

TI

RU

A°

CC

MGO/MGC.fEU

IU FEhlCS =

HEIGHT HCPM

<100.0)

41.06

.24

5.26

4B.01

.95

o.oo

o.oo

0.00

o.oo

0.00

o.oo

1.0 2

0.0 0

3.4 5

0.0 0

O.O O

0.0 0

0.0 0

0.0 0

0.0 0

.85

NOU-OXlDATIOI s NOR M

(FE2O 3 CONVF.HTE O T O FEO )

38.7 3

.25

5.2 9

48.2 3

.96

0.0 0

0.0 0

0.0 0

0.0 0

0.0 0

0.0 0

6.5 5

0.0 0

0.0 0

0.0 0

0.0 0

0.0 0

0.0 0

0.0 0

0.0 0

.16

SI

AL

FM

c

AL<

K

MG

TI

P

492

40. 2

20. 5

1.3

3 8 . 0

.09

.15

0.0

0.0 0

3-COKPONENT

wT.PERCENTS

F 33.98

M 3.19

A 62.B3

34.45

1.86

63.69

83.98

13.17

2.84

124

HORNHLENDlTL

2.49U 44.05E,

F. MAnASSt. 1917

OF I:•> A»AbA, SOMALIA

SI02

TI02

AL2O3

FE203

FFO

MNO

MOO

CAO

NA20

K20

P?U5

H?U*

H2UCO2

snj

4 ? . 9 H

.96

1 0 . K 4

2.2 0

1O.? H

.45

12.6 6

11.OP

2.30

• 69

O.( 0

1.11

0.00

0.00

0.00

*ATtR-C02-FHFE

*.B

10

2

10

12

11

2

.25

.97

.90

.21

.34

• 45

.73

.14

.31

(100.0)

SI

TI

AL

Ft3

Kt2

MN

Mu

CA

NA

K

P

H +

HC

S

ATOM S

WEIGH T

22.4 2

.58

5.7 4

1.5 4

7.9 9

.35

7.6 4

7.9 2

1.7 1

.57

0.0 0

.01

0.0 0

0.0 0

0.0 0

ATOM S

NUHhER S I10U.0 )

17.7 8

.27

4.7 3

.61

3.1 9

.14

7.0 0

4.4 0

1.6 5

.33

0.0 0

0

CT

00

AH

AM

NE

LC

AC

NS

DI

wo

HY

CL

MT

H»

IL

TI

PJ

Ar>

CC.

MGO/.ICiCn- i G

11^ FLivRS =

k.LlCHT I.C'-.t'

(100.0)

0.00

0.00

H.ll

17.38

1 7. 7fl

1.20

0.00

0.00

0.00

30.PS

0.00

0.00

24.09

3.21

0.00

1.P3

0.00

0.00

U.00

o.oo

.7?

NON-0XIDATIUN NOkM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

4.13

14.90

17.36

2.59

0.00

0.00

0.00

31.27

0.00

0.00

27.92

0.00

0.00

1.84

0.00

0.00

0.00

0.00

.66

o.uo

.40

3-COMPONE.NT

WT.PERCENTS

F 44.37

M 45.01

A 10.63

F 47.01

C 41.73

A 11.?6
125

H0RNRLENUE-,iEUtr4?LKGITE !,IGRITt

2.50H 44.26E. uiUF* (,ULO. S. SOMALI

T. MANASSL, 1917

3>IO2

TIU2

AL2O3

FE2O3

FEO

MMO

MGO

CAu

NA2O

<2J

P2J5

H2U*

H2OCO2

SO3

TOTAL

OHldl'tW

AhALYSii

46.74

1.11

14.11

1.66

8.34

.23

6.73

16.04

3.01

.75

.06

.(.0

0.00

U.OO

0.00

0.00

0.00

0.00

0.00

101.38

wATER-C02-FkEE

(100.0)

48.36

1.10

14.00

1.65

8.28

.23

6.68

15.92

2.99

.74

• Ofc

SI

TI

AL

FE3

Ft2

MN

Mb

CA

NA

K.

P

H*

HC

S

0

ATOMS

HEIGHT

22.77

.67

7.47

1.16

6.48

.18

4.06

11.46

2.23

.62

.03

.01

0.00

0.00

0.00

44.24

ATOhS

NUMBEKS (100.0

17.87

6

2

3

6

2

31

10

46

56

07

68

30

14

35

02

60.1%

0

CB

OR

An

AN

NE

LC

AC

NS

DI

wo

HY

OL

MT

H"l

IL

TI

Kll

AP

CC

MGU/MGG+FEU

IN FEMICS =

WEIGHT f:OHM

(100.0)

0.00

0.00

4.41

6.42

22.56

9.15

0.00

U.OO

0.00

46.07

0.00

0.00

4.78

2.39

0.00

2.09

0.00

0.00

.13

U.OO

.64

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

4.42

6.55

22.63

10.21

0.00

0.00

0.00

46.62

0.00

0.00

7.35

0.00

0.00

2.10

0.00

0.00

.13

0.00

3-COMPONENT

WT.PERCENTS

F 48.80

M 32.85

A 18.35

33.56

53.83

12.62

15.20

3.7S

81.01

No. 125 microcline; uncommon quartz, with undulose extinction;

REMARKS: See under 105. common biotite and ferric-poor hornblende, in contorted

MINERALiOGY: Rather fine-grained. Groundmass: Fresh, crystals; accessory ilmenite and leucoxene, titanite,

zoned labradorite-andesine; occasional crystals bytownite; apatite, zircon; secondary muscovite.

green-brown hornblende, of earlier generation than cleargreen hedenbergite; accessory titanite, epidote, apatite,

magnetite; no quartz nor alkali feldspar.

No. 126

REMARKS: See under 105.

MINERALOGY: Panidiomorphic; some lamination

developed. Groundmass: Rather large, prismatic

amphibole; pleochroism differs from hornblende in being

yellow-green — intense green-brown — dark green.

Somewhat altered oligoclase-andesine; no alkali feldspar;

minor quartz; accessory apatite, magnetite, limonite.

No. 127

REMARKS: See under 105. MnO trace.

MINERALOGY: Cataclastic structure. Groundmass:

Albite-oligoclase, commoner than antiperthite (with

myrmekite) showing undulose extinction, rare xenoblastic
126

AMPHlbOLE DiOKITt"

2.49W 44.05E.

E. MANASSE. 1917

AkAfaA, S. 5OHALI

5102

TI02

AL2O3

FE203

FEU

KNU

MGO

CAQ

NA20

K20

P2O5

H20*

H20-

C02

503

TOTAL

ORIGINAL

ANALYSIS

51.7R

.82

17.28

2.29

8.b6

.43

4.13

9.32

3.67

1.17

.06

.78

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.59

WATER-C02-FKEE

(100.0)

51.88 SI

Tl

AL

FL3

FE2

MN

Mt>

CA

NA

K

P

Ht

HC

S

ATOMS

XEIGHT

24.19

.49

9.14

1.60

6.89

.33

2.49

6.66

2.72

.97

.03

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

18.93

.23

7.44

.63

2.71

.13

2.25

3.65

2.60

.55

.02

Q

cn

OR

A8

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

IL

TI

RU

AP

CC

MCjG/MGOthCO

wtlGHT HOUK

(1OO.O)

0.00

0.00

6.94

31.17

27.23

0.00

0.00

0.00

0.00

15.75

0.00

6.85

7.03

3.33

0.00

1.56

U.00

0.00

.13

0.00

NON-OXIDATION NORM

(KE203 CONVERTED TO FEO)

0.00

0.00

6.97

31.31

27.35

o.oo 0.00

0.00

0.00

15.99

0.00

2.22

14.46

0.00

0.00

1.57

0.00

0.00

.13

o.oo

129

25.3

39.0

24.9

10.7

.17

.39

3-COMPGNENT

WT.PERCENT5

F 55.4?

M 20.53

A 24.06

F 44.05

C 36.87

A 19.1?

N 25.92

K 8.26

C 65.8?

HlOTITE-HOHNt-.LENDE GNEISS

2.SON 44.26R, BUR .'iUI.P,

E. MANASSt. 1917

SIU2

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C0<>

S03

TOTAL

OrtI&r:A|

ANALYSIS

61.21

1.04

16.02

2.10

4.28

0.00

3.65

4.96

4.21

2.54

.23

.64

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.R8

k.ATE«-C02-FKtE

(100.0)

61.06

1.04

15.98

2.09

4.27

0.00

3.64

4.95

4.20

2.53

.23

SI

TI

AL

Ft3

FL2

MN

Mij

CA

NA

•4 +

-|_

ATOMS

*EIGHT

28.60

.62

8.48

1.47

3.33

0.00

2.20

3.54

3.12

2.11

.10

.01

0.00

0.00

0.00

ATOMS

NUMftERS (100.0

21.56

.28

6.65

.56

1.26

0.00

1.92

1.87

2.88

1.14

.07

IL

TI

RU

AP

CC

MGO/MGO*FEU

IN FLMCS =

(•EIGHT foOHM

(1U0.0)

10.61

0.00

15.01

35.62

17.22

0.00

0.00

0.00

0.00

4.88

0.00

11.14

0.00

3.05

0.00

1.97

0.00

0.00

NON-OX I DAT I ON NORM

(FE2O3 COIMVFRTED TO FEO)

8.43

0.00

15.07

35.76

17.29

0.00

0.00

0.00

0.00

5.02

0.00

15.94

0.00

0.00

0.00

1.98

0.00

0.00

.50

0.00

197

30

34

17

18

2

23

.4

.2

.1

.4

.28

.51

.5

.31

.50

3-COMPONENT

WT.PE«CENTS

F 38.0?

M 71.75

A 40.23

F 35.27

C 27.42

A 37.31

N 35.95

K 21.69

C 42.36
128

MOTITt GNEIS

1.S2H 42.57L .

-.. XMASSt , 1<*

< hILL, S. SOMALI

SIU2

TI02

AL203

FF.203

FF.0

MGO

P?O5

H2O +

H2UWATEN-CO2-FK£E

(100.0)

b4.85

. 8 4

16.38

2.82

1.73

0.00

2.98

2.49

5.33

2.51

. O H

SI

Tl

AL

FL3

Ft2

MIt

Mo

CA

NA

K

H

H +

H -

C

s

ATOMS

HEIGHT

30.21

. 5 0

8.6'

1 . 9

1.3'

0.0(

1 . 7

1 . 7

3.9'

i

)

2.08

. 0 3

. 0 1

0.00

0.00

0.00

ATUMS

NUi-iHERS (100. 0

22.5 3

. 2 2

6.71

. 7 4

. 5 0

0.00

1.54

. 9 3

3.59

1.11

.02

CiHT MGI->,

(100.0 )

5 3

5 2

86

16

9 0

CO

0 0

0 0

0 0

0 0

ro

4 4

10

13

f 7

t o

0 0

0 0

NON-OXIUATIUN MORM

UE2O3 CONVF.IUED TO KEO)

11.3 7

. 5 2

14.94

45.42

11.96

0.00

0.00

0.00

0.00

0.00

0.00

13.49

0.00

0.00

o.oo

1.61

0.00

0.00

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

uz

2 3 9

3 5 .

9 .

2 5 .

2 .

3 9

3-COMPONEhT

WT.PERCENTS

F 29.59

M 19.40

A 51.01

F 30.57

51.60

24.30

24.10

No. 128

REMARKS: See under 105. MnO trace.

MINERALOGY: Porphyroblastic cataclasite. Phenocrysts:

Fresh microcline. Groundmass: Abundant small albiteoligoclase (slightly kaolinised, with mica and calcite),

with zoning out to albite rims; uncommon quartz in

irregular grains, with undulose extinction; chloritised

biotite; rare muscovite; rare, rather large actinolite

associated with biotite; accessory magnetite, ilmenite,

apatite, zircon, secondary titanite, epidote.

No. 129

REMARKS: See under 105. TiO, trace. This analysis

is reproduced in Aloisi (1938) with 0. 29% MgO and 0. 30%

MINERALOGY: Uniformly medium-grained. Groundmass:

Abundant microcline, occasionally with perthite or cryptoperthite; rare orthoclase; somewhat sericitised albiteoligoclase, with albite rims; quartz (straight extinction)

with numerous inclusions; yellow-black biotite; accessory

muscovite, iron-oxides, titanite, apatite, zircon.

No. 130

REMARKS: See under 105. Po°5

 traLCe> n o

 separate

determination of FeO.

MINERALOGY: Fine-grained, saccharoidal quartzfeldspar rock. Groundmass: Slightly altered, zoned

andesine (between labradorite and oligoclase-andesine);

no alkali feldspar; quartz, rich in inclusions of

tourmaline and less common apatite; accessory hornblende.
129

PIOTITC i.KANlT[

i.'.Rn 44.05E.

E. HA«AS5t, 1917

r,UF; Ai.Al A, S.

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGU

CAO

NA20

K2O

P2O5

H2O+

H2OCO2

503

ANALYSIS

72.17

0.00

14.72

.93

1.02

0.00

• 59

1.58

4.B2

4.94

.09

0.00

0.00

0.00

O.CO

0.00

0.00

0.00

71.55

0.00

14.59

.92

1.01

0.00

SI

Tl

AL

Ft3

F£2

MN

MC

CA

NM

K

P

H*

HC

s

ATOMS

HEIGHT

33.72

0,00

7.79

.65

.79

0.00

.36

1.13

3.58

4.10

.04

0.00

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

24.67

0.00

5.93

.24

.29

o.oo .30

.58

3.20

2.16

.03

0

OR

A=?

AN

MF

LC

AC

NS

DI

WO

HY

OL

hT

H»1

IL

TI

RU

AP

CC

MGO/MGG-H-fcO

IN FEMIC3 =

oElCHT NOKto

(100.0)

21.07

0.00

29.C3

40.54

3.83

0.00

0.00

0.00

0.00

2.C.2

I). CO

1.18

o.oo 1.34

0.00

0.00

0.00

0.00

. .20

0.00

.6<t

NON-OX IDA!ION NORM

(FE2O3 CONVERTED TO KEO)

20.13

0.00

29.08

40.61

3.84

0.00

0.00

0.00

0.00

2.93

0.00

3.22

0.00

0.00

0.00

0.00

0.00

0.00

.20

0.00

.37

C/FM

02

3-COMPONENT

HT.PERCENTS

F 15.B5

M 4.80

A 79.35

F 14.67

C 11.89

A 73.44

N 4?.50

K 43.5h

C 13.93

130

DIORI TIC APLlIt.

2.49,>l 44.05E,

F. MAHASbt. 191/

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MG<J

CAO

N«20

K20

P2O5

H20*

H?0-

C02

S03

TOTAL

ANALYSIS

74.00

0.00

15.56

.18

0.00

U.00

.19

5.06

4.36

.32

0.00

• 43

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.10

k,ATER-C02-FKLF

(100.0)

74.25

0.00

15.61

.18

0.00

0.00

SI

TI

AL

Ft 3

FL2

MN

Mti

CA

NA

K

P

H*

HC

s

ATOMS

J.E1CHT

34.57

0.00

8.23

.13

0.00

0.00

.11

3.62

3.23

.27

0.00

.01

0.00

0.00

0.00

ATOMS

NIMhERS (100.0)

25.24

0.00

6.26

.05

0.00

0.00

.1U

1.R5

2.R9

.14

0.00

0

OH

AH

AN

NF

LC

AC

N5

DI

WO

HY

OL

HT

H'l

IL

TI

R.J

Al)

CC

M<iU/MG0 + |-LO

I.J FtMC S =

wtK'HT fiOi.'M

(100.0)

36.97

0.00

1.90

37.12

21.99

0.00

0.00

0.00

0.00

1.03

• Kl

0.00

0.00

0.00

4 ]S

0.00

O.CO

0.00

0.00

U.00

1.00

NON-OXIDATION NORK

(fE2O3 CONVFKTE U TO FEO)

36.86

0.00

1.90

37.13

22.00

0.00

0.00

0.00

0.00

1.53

.58

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

• 70

SI

AL

FH

C

ALK.

K

rfG

TI

P

C/FM

OZ

380

47.1

Z.i

27.9

22. a

.05

.r>h

0.0

0.00

12.95

189

3-COhPONFNT

WT.PERCENTS

F 3.56

1.81

51.01

47.1A

44.76

3.29

51.95
131

APLITt

2.O6U 43.0bt» MALA'!LI Alii

F. *IArtASS£, 1917

AyLOLI, S. SOMALI

SIU2

TIO2

AL2O3

FE,;O3

FEU

MNU

MGO

CAO

NA2O

K2O

P205

H2O+

H2OCO2

SOJ

TOTAL

OkltliAL

ANALY5IS

7b.18

0.00

13.74

1.01

0.00

0.00

.15

.53

5.11

4.8b

0.00

.23

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100,RO

hATER-C02-FREE

74.75

0.00

13.66

1.00

0.00

0.00

.15

.53

5.08

4.82

0.00

(100.0)

SI

TI

AL

Fh3

Ft2

MN

MG

CA

NA

<

P

H*

HC

S

0

ATOMS

*EIGHT

35.12

0.00

7.27

.71

0.00

0.00

.09

.38

3.79

4.03

0.00

.00

0.00

0.00

0.00

49.41

ATOMS

NUMBERS (100.0)

25.58

0.00

5.51

.26

0.00

0.00

.08

.19

3.37

2.11

0.00

62.90

WhlCHT r-iOftM

(100.0)

25.74

0.00

26.b8

43.11

.15

0.00

0.00

0.00

0.00

.80

.60

0.00

0.00

0.00

1.01

0.00

0.00

0.00

0.00

0.00

In FEMCS = 1.0°

NON-OXIDATIUN NORM

(FE2O3 CONVERTED TO FEO)

25.11

0.00

28.64

43.19

.15

0.00

0.00

0.00

0.00

2.14

0.00

.77

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.25

NIGGLl

424

4 5.

0.0

0.00

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

9.08

1.35

89.57

8.78

4.61

86.61

48.71

46.21

5.05

No. 131

REMARKS: See under 105. No separate determination of

FeO; P2O5 trace.

MINERALOGY: Fine-grained, equigranular quartzofeldspathic rock. Groundmass: Abundant kaolinised microcline-microperthite (some cryptoperthite); common

altered albite; quartz, with undulose extinction; rare

biotite (pleochroism yellow-green brown); accessory

zircon, apatite, secondary magnetite; muscovite,

orthoclase(?).

No. 132

REMARKS: TiO-, Al O CaO, NiO absent; MnO trace;

no separate determination of H?O-.

MINERALOGY: Groundmass: Serpentinised, round

colourless olivine (2V = 88-1/2°); accessory chromite in

dispersed form; antigorite; secondary magnetite.

No. 133

MINERALOGY: Groundmass: Quartz, chalcedony,

limonite.

OTHER INFORMATION: Reddish violet-chocolate

coloured rock, with porcelanous appearance, which

forms a thick capping to the dunites of the Yubdo region

(see Augustithis, 1965).

REMARKS: A1-,O, trace; no separate determination of
132

DUNITE

8.58N 35.28E, YUBDO, KOLLLGA

L. DUPARC AND E. MOLLY, 1928

SIO2

TIO2

AL2O3

FE2O3

FEU

MNO

MGO

CAO

NA2O

IC2O

P2O5

H2O +

H2OCO2

SO3

CKZO'i

TOTAL

ORIGI,\|Ai

ANALYSIS

36.55

0.00

0.00

7.05

4.25

0.00

43.51

0.00

0.00

0.00

0.00

8.60

0.00

0.00

0.00

.35

0.00

0.00

0.00

100.31

kvATER-C02-FREE

(100.0)

40.01

0.00

0.00

7.72

4.65

0.00

47.62

0.00

0.00

0.00

0.00

SI

TI

AL

FE3

FE2

MN

HG

CA

MA

K

P

H*

HC

5

ATOMS

WEIGHT

17.08

0.00

0.00

4.93

3.30

0.00

26.25

0.00

0.00

0.00

0.00

.10

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

14.06

0.00

0.00

2.04

1.37

0.00

24.98

0.00

0.00

0.00

0.00

NORM SI02 DEFICIT 0.00

MGO/MGO+FEU

IN FEMICS =

0.00

Wfcl&HT NORM

(100.0)

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

13.06

75.73

11.21

0.00

0.00

0.00

0.00

0.00

0.00

-.16

NON-OXIDATION NORM

(FE2O3 CONVEKTED TO FEO)

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.le

0.00

0.00

0.00

0.00

0.00

0.00

0.00

AL

FM

c

ALK

K

MG

TI

p

0.0

100.0

0.0

0.0

I

.88

0.0

0.00

3-COMPONENT

WT.PERCENTS

F 20.62

M 79.38

A 0.00

F 100.00

C 0.00

A 0.00

133

rIRBIklTL

8.58N 35.27L,

L. DUPARC AND

VALLLYi

19?8

YUBuO, wOLLEGA

SI 02

TI02

AL2O3

FE2O3

FEU

MNO

MGO

CAO

NA20

K20

P2O5

H2U +

H20-

C02

S03

CR103

TOTAL

ORIGINAL

ANALYSIS

8a.2O

0.00

0.00

9.01

.28

0.00

.30

.24

0.00

0.00

0.00

1.50

0.00

0.00

0.00

.('6

0.00

0.00

0.00

100.39

ATER-C02-FREE

(100.0)

9.97

0.00

0.00

9.19

.29

0.00

.31

.24

0.00

0.00

0.00

SI

TI

AL

FE3

FE2

MN

Mt,

CA

NA

K

P

H*

Hc

s

ATOMS

HEIGHT

41.21

0.00

0.00

6.30

.22

0.00

.18

.17

0.00

0.00

0.00

.02

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

31.09

0.00

0.00

2.39

.08

0.00

.16

.09

0.00

0.00

0.00

0

CFS

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGOFEO

IN FEMCS =

rftlGHT NORM

(100.0)

89.22

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.95

0.00

.32

0.00

.92

8.58

0.00

0.00

0.00

0.00

0.00

1.00

NON-OX I DAT I ON NORM

(FE2O3 CONvFKTED TO FEO)

84.22

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

1.10

0.00

14.68

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.07

NlGGLl

1139

0.0

96.7

3.3

0.0

I

.06

O.U

0.00

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

96.«7

3.13

0.00

97.48

2.52

0.00

0.00

0.00

100.00
134

ALBITIC A

11.05N 49.

P. ALOISI

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2a5

H2J*

H2Oco<; SOS

TOTAL

OKIOIMA L

ANALySlb

61.27

0.00

25.2H

,h2

0.00

0.00

0.00

.50

6.50

4.44

0.00

1.68

.20

0.00

0.00

0.00

0.00

0.00

0.00

100.49

WATER-C02-FREE

(100.0)

62.13

0.00

25.64

.63

0.00

0.00

0.00

.51

6.59

4.50

0.00

SI

TI

AL

FE3

F£2

MN

Mt,

CA

NA

K.

P

H*

HC

S

0

ATOMS

WEIGHT

28.63

0.00

13.38

.43

0.00

0.00

0.00

.36

4.82

3.69

0.00

.02

.00

0.00

0.00

49.17

ATOMS

NUrtBERS (100.0)

21.26

0.00

10.34

.16

0.00

0.00

0.00

.19

4.38

1.97

0.00

61.71

0

CB

OR

AH

AN

NE

LC

AC

NS

DI

WO

HY

OL.

MT

H"l

IL

TI

RU

Ar>

Cf

MGU/MGO+htU

IA FLMC5 =

HEIGHT NORM

(100.0)

5.28

8.97

26.68

55.92

2.52

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

• 63

0.00

0.00

0.00

0.00

0.00

0.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

4.86

8.98

26.71

55.98

2.53

0.00

0.00

0.00

0.00

0.00

0.00

.94

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

NIGGLI

SI

AL

KM

C

ALK

K

MG

TI

P

C/FM

QZ

244

59.

1.

2.

36.

0.

0.

0.

1.

-2

3-COMPONENT

WT.PERCENTS

F 5.36

M 0.00

A 94.64

F 5.14

C 4.IS

A 90.71

N 56.87

K 38.81

C 4.37

No. 134

REMARKS: TiO_ trace, no separate determination of

FeO (analyst: P. Comucci).

MINERALOGY: White, very fine-grained rock.

Groundmass: Fresh albite, some as micro-phenocrysts;

no microcline nor orthoclase; rather rare, small

rounded quartz; small laths of irregularly distributed

muscovite; accessory iron-oxides, chlorite.

No. 135

REMARKS: MnO trace (analyst: P. Comucci).

MINERALOGY: Medium-grained, hypidiomorphic.

Groundmass: Abundant zoned An37 — An20; scarce microcline (with myrmekite); abundant quartz (gently undulose

extinction); abundant biotite (fresh or slightly chloritised),

intensely coloured and pleochroic; accessory apatite

(rather common and large); zircon in pleochroic haloes in

biotite.

No. 136

MINERALOGY: Groundmass: Abundant chlorite,

kaolinised An30-23, hornblende (more common than in

no. 140), accessory iron-oxide and calcite.

OTHER INFORMATION: Specific gravity 3.046,

published norm incorrect.
135

HIOTITE ijRANlTE

U.27N 49.34E,

P. ALOISI, 1934

HANTARA, KANDALA, N. SOMALI

SIU2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O+

H20-

CO2

S03

TOTAL

ORIGINAL

ANALYSIS

69.96

• 50

15.54

.39

2.22

0.00

1.28

2.98

2.68

3.78

.20

.HI

.12

o.oo 0.00

0.00

0.00

o.oo 0.00

100.46

»ATER-C02-Fr(tE

(100.0)

70.29

.50

15.61

.39

2.23

0.00

1.29

2.99

2.69

3.80

.20

SI

Tl

AL

Ft3

Ffc2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

32.69

.30

8.22

.27

1.73

0.00

.77

2.13

1.99

3.14

.09

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0

24.35

6

0

1

1

1

13

37

10

65

00

67

11

81

68

06

cc

MGQ/MGO*FEO

IN FE.MICS =

HEIGHT NORM

(100.0)

30.78

2.03

22.51

22.84

13.71

0.00

0.00

0.00

0.00

0.00

0.00

6.16

0.00

.57

0.00

.95

0.00

0.00

.44

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

30.38

2.04

22.53

22.86

13.72

0.00

0.00

0.00

0.00

0.00

0.00

7.08

0.00

0.00

0.00

.95

0.00

0.00

.44

0.00

SI

AL

FM

C

ALK

326

42.7

19.0

14.9

23.4

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 25.22

M 12.37

A 62.42

F 21.66

C 24.73

A 53.61

N 28.39

K 40.04

C 31.57

136

GREENSCHIST

. MURA-jABO WATERFALL. DABUS VALLEY. WOLLEGA

L. MUHLEN AND J.H. HELL-1ERS, 1936

SI02

TI02

AL2O3

FE2O3

FEO

MNU

MGU

CAO

NA20

K2G

P205

H20+

H2QC02

S03

S

-0

TOTAL

ORIGINAL

ANALYSIS

43.19

3.75

13.35

10.01

9.25

.22

4.R4

8.29

2.79

.76

.38

3.00

.06

• 38

0.00

.26

0.00

0.00

-.07

100.46

WATER-C02-FKEE

(100.0)

44.60

3.87

13.79

10.34

9.55

.23

5.00

8.56

2.88

.78

.39

SI

TI

AL

Ft3

FE2

MN

Mo

CA

NA

<

P

H +

HC

S

ATOMS

WEIGHT

20.18

2.25

7.06

7.00

7.19

.17

2.92

5.92

2.07

.63

• 17

.04

.00

.10

0.00

ATOMS

NUMBERS (100.0)

16.93

1.11

6.17

2.96

3.04

.07

2.83

3.46

2.12

.38

.13

0

C3

OR

AR

AN

NE

LC

AC

NS

01

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGOtFeO

IN FE>ICS x

HEIGHT MOI'M

(100.0)

2.90

0.00

4.63

24.33

22.24

0.00

0.00

0.00

0.00

12.24

0.00

9.64

0,00

14.96

0.00

7.32

0,00

0,00

.85

.69

.84

NON-OXlDATIUN NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

4.72

24.82

22.69

0.00

0.00

0.00

0.00

13.31

0.00

.86

24.36

0.00

0.00

7.47

0.00

0.00

.B7

.91

.38

FM

C

ALK.

K.

MS

TI

P

C/FM

OZ

53.2

20.9

7.5

.15

.32

6.6

.38

.39

-29

3-COMPONENT

WT.PERCENTS

F 69.66

M 17.50

A 12.84

F 61.93

C 26.66

A 11.41
137

F'AbK XLNOLlTh IN UIORIT L 1*3

10.27.J 35.0»E* TULU ;<OjA, LO*[

L. MUHLEN AND J.H.HELLV.E,<S, 1936

OAbUS VALLEY. «OLLE6A

SI 02

TIO2

AL2O3

FE2O3

FEO

MNO

MGU

CAU

NA2O

KZU

P2U5

H2G +

H2OCO2

SO3

TOTAL

ORIGINAL

AUALYSI;

46.11

.57

14.25

10.26

6.11

.19

4.95

9.83

4.44

1.34

.51

1.58

.07

0.00

0.00

0.00

0.00

0.00

0.00

100.21

ATER-C02-FKEE

(100.0)

6.78

4

0

6

5

9

4

1

58

46

41

20

19

02

97

50

36

52

SI

TI

AL

FL3

Ft2

MN

MG

CA

NA

K

P

H+

HC

5

ATOMS

WEIGHT

21.54

.34

7.54

7.18

4.75

.15

2.99

7.03

3.29

1.11

.22

.02

.00

0.00

0.00

ATOMS

NUMBEKS (100.0)

17.43

.16

6.35

2.92

1.94

.06

2.79

3.98

3.26

.65

.16

0

CB

OH

AB

AN

NE

LC

AC

NS

Dl

WO

HY

OL

MT

HM

IL

TI

R'J

AP

CC

M&O/MGC«-FFO

IN FEt".ICS =

WEIGHT i:OI<M

(100.0)

0.00

0.00

S.05

25.73

15.16

6.75

0.00

0.00

0.00

24.84

0.00

0.00

2.13

15.12

0.00

1.10

0.00

0.00

1.13

0.00

.88

NON-OXIDATION NORM

(FE2O3 CONVFKTED TO FEO)

0.00

0.00

8.21

14.02

15.47

13.51

0.00

0.00

0.00

27.15

0.00

0.00

19.37

0.00

0.00

1.12

0.00

0.00

1.15

0.00

.38

NI66LI

SI

AL

F*

C

ALK

K.

MG

TI

P

C/FM

oz

103

18.

45.

23.

11.

1.

-43

3-COMPONtNT

WT.PERCENTS

F 60.41

M 18.27

A 21.33

F 51.19

C 30.74

A 18.07

N 28.44

K 8.5b

C 62.97

No. 137

REMARKS: Compared with host-rock no. 143: high

alkalis (for SiCu^o); higher iron, magnesium, calcium;

same aluminium.

MINERALOGY: None given.

OTHER INFORMATION: Specific gravity 3. 132.

No. 138

MINERALOGY: Groundmass: Subparallel An58; some

olivine with keliphytic hornblende; accessory titanite,

magnetite (some in olivine).

OTHER INFORMATION: Specific gravity 2.932; see under

no. 139.

No. 139

MINERALOGY: Groundmass: Labradorite, chloritised

hornblende, orthoclase, augite, apatite, olivine, biotite,

zircon.

OTHER INFORMATION: Specific gravity 2. 969. Mt.

Karawini is a grabbo-anorthosite massif, with associated

hornblende granite and syenitic diorite.
138

ANORTHOSlTIC &Aij!?RO

9.53N 35.14E, MT. KAkAwIM. DAnUS VALLEY. wOLLEGA

L. MUHLEN AND J,H. HELLMEKS. 1936

5102

T10Z

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P205

H2C1*

H20-

C02

S03

5

TOTAL

OKIGIUAL

ANALYSIS

46.30

.77

20.12

2.01

6.02

.07

10.34

9.(41

3.3ft

.34

.04

.66

.10

.17

0.00

.06

0.00

0.00

0.00

100.39

WATER-C02-FKEE

(100.0)

46.67

.78

20.28

2.03

6.07

.07

10.42

9.89

3.41

.34

.04

SI

TI

AL

FE3

Ft2

MN

Mb

CA

NA

K

P

H+

HC

S

ATOMS

WEIGHT

21.63

.46

10.65

1.41

4.68

.05

6.24

7.01

2.51

.28

.02

.01

.00

.05

0.00

ATOMS

NUMBERS (100.0

16.74

8

1

5

3

2

21

57

55

82

02

58

80

37

16

01

0

CS

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FKU

IN FEMICS =

WEIGHT NORM

(100.0)

0.00

0.00

2.03

20.23

3B.93

4.66

0.00

0.00

0.00

7.07

0.00

0.00

22.19

2.94

0.00

1.47

0.00

0.00

.09

.39

.80

NON-OXIDATION NORM

IFE2O3 CONVERTED TO FEO)

0,00

0.00

2.03

17.97

39.08

5.95

0.00

0.00

0.00

7.17

0.00

0.00

25.83

0.00

0.00

1.4a

0.00

0.00

.09

.39

.72

AL

FM

C

ALK

24.7

46.0

22.0

7.3

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 36.35

M 46.81

A 16.84

F 37.24

C 45.50

A 17.25

139

•,ABBRU

9.53N 35.14E. MT. KAP.AI.IM . uAnUi VALLEY.

L. MUrtLEN AND J.H . HELL.1EPS, 193*.

SIO2

TIO2

AL2O3

FE2O3

FEO

MNiJ

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

SO3

S

TOTAL

ANALYSIS

4b.82

.73

16.76

3.11

4.43

.09

tf.fil

11.90

3.38

.45

.05

1.37

.06

.05

0.00

.03

0.00

0.00

0.00

100.04

»ATLR-C02-FKLE

(100.0)

49.55

.74

17.01

3.16

4.50

.09

8.94

12.08

3.43

.46

.05

SI

TI

AL

FE3

FE2

MN

Mo

CA

NA

K

P

ATOMS

wEIGrfT

22.81

.44

8.87

2.18

3.44

.07

5.31

8.50

2.51

.37

.02

ATOMS

NUMhERS (100.0

17.63

7

1

4

4

2

20

22

86

36

03

80

66

40

21

02

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FtO

IN FEf'ICS =

WEIGHT NOKM

(100.01

0.00

0.00

2.70

23.75

29.61

2.S8

0.00

0.00

0.00

23.64

0.00

0.00

11.19

4.58

0.00

1.41

0.00

0.00

.11

.12

.86

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

2.72

20.24

29.79

4.88

0.00

0.00

0.00

24.31

0.00

0.00

16.42

o.oo 0.00

1.41

0.00

0.00

.11

.12

.71

SI

AL

FM

C

ALK

107

21.7

42.4

28.1

7.h

C/FM

QZ

3-C0MP0NENT

WT.PERCENTS

F 37.3h

M 43.66

A 18.98

F 32.40

C 51.14

A 16.46

N 21.49

K 2.86

C 75.65
CHLORITt SCHIST

« GEDO R1VF.R, CAsuS vAULEY. hOLLFiiA

L. MUHLEN AND J.H . H6LLMERS, 1936

SI02

TI02

AL2O3

FE2O3

FFU

I* N O

MGO

CAO

NA20

K2U

P2O5

H20*

H20-

CO,;

S03

s

-0

TOTAL

a

c^

OR

Ay

AN

HE

LC

AC

NS

DI

wo

HY

OL

MT

H

V1

IL

TI

RU

AP

CC

MGO/MGO+KCO

In FLflCS =

ORItlMAl

ANALYSIS

50.09

1.69

14.77

10.49

3.13

.36

7.30

1.35

7.44

.35

.30

3.07

.11

0.00

0.00

.08

U.OO

0.00

-.02

100.51

WEIGHT NORM

(100.0)

0.00

.32

2.13

59.77

5.08

2.75

0.00

0.00

0.00

0.00

u.oo

0.00

13.12

6.57

6.28

3.30

0.00

0.00

.67

0.00

1.00

WATER-C02-FREE

(100.0)

51.50

1.74

15.18

10.78

3.22

.37

7.50

1.39

7.65

.36

.31

NON-OXIDATION NORM

(FE2O3 CONVFRTED TO FEO)

0.00

.33

2.18

50.97

5.19

8.26

0.00

0.00

0.00

0.00

0.00

0.00

29.02

0.00

0.00

3.37

0.00

0.00

.69

0.00

.55

SI

Tl

Al_

FE3

Ft2

MN

MCJ

CA

NA

K

P

H +

HC

5

0

ATOMS

WEIGHT

23.40

1.01

7.61

7.34

2.43

.28

4.40

.96

5.52

.29

.13

.04

.00

0.00

0.00

46.82

NIGOLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

ATOMS

NUMBERS (100.0)

18.46

.47

6.42

2.91

.97

.11

4.02

.53

5.32

.16

.09

60.53

127

22.1

55.3

3.7

18.9

.03

.50

3.2

.32

.07

-49

3-COMPONENT

WT.PERCENTS

F 47.44

M 25.43

A 27.13

F 59.84

No. 140

REMARKS: CO2 absent.

MINERALOGY: Groundmass: An25 and chlorite

(plagioclase is kaolinised), some magnetite and hornblende(?).

OTHER INFORMATION: Specific gravity 2.790; this rock

occurs where the regional foliation is N-NNE.

No. 141

MINERALOGY: Abundant kaolinised microcline. Groundmass: Hornblende (hastingsite with a tendency to

barkevikite); augite, hypersthene, some An52-48,

magnetite, apatite.

OTHER INFORMATION: Specific gravity 2.878; this rock

is associated with syenite and pegmatite, and occurs at

the effluence of the Moli into the Dabus.

No. 142

MINERALOGY: Coarse-grained. Groundmass: Hastingsite (3-8 mm grains), fresh An45-43, biotite, orthoclase,

magnetite, olivine, apatite, zircon, small augite.

OTHER INFORMATION: Specific gravity 2.878.
141

MICROCLIN L UIORIT E

10.34H 35.08E, MOLI STREAM, DAHUS VALLEY , WOLLEG A

L. MUHLEN AND J.H. HELLMEKS , 193<

SIO2

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K2o

P2O5

H2O+

H20-

CO2

503

S

TOTAL

ANALYSIS

54.12

.75

16.75

4.64

3.90

.11

3.41

6.19

4.59

3.12

.12

1.77

.09

.38

0.00

.05

0.00

o.oo 0.00

99.99

*ATER-C02-FREE

55.39

.77

17.14

4.75

3.99

.11

3.49

6.34

4.70

3.19

.12

(100.0)

nM_

FE3

"E2

MN

MC

CA

«A

it

1.

ATOMS

WEIGHT

25.28

.45

8.86

3.25

3.03

.09

2.06

4.42

3.41

2.59

.05

.02

.00

.10

ATOMS

NUMBERS (100.0)

19.88

.21

7.25

1.29

1.70

.03

1.H7

2.44

3.27

1.46

.04

0

Cfl

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

111 FEKICS =

WEIGHT NORM

(100.0)

0.00

0.00

18.84

39.68

16.13

0.00

0.00

0.00

0.00

9.63

0.00

5.72

.51

6.88

0.00

1.45

0.00

0.00

.27

.88

.83

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

19.01

38.12

16.2a

1.04

0.00

0.00

0.00

10.23

0.00

0.00

12.69

0.00

0.00

1.46

0.00

0.00

.27

.89

.46

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 43.44

M 17.34

A 39.22

F 38.06

C 27.50

A 34.36

C

D.I.

33.02

22.45

44.53

142

HORNnLENDE OIORITE

10.27N 35.08E, TULU DOjA, LOwER DA8US VALLEy,

L. MUHLEN AND J.H . HELLfiERS, 1936

SIU2

T102

AL2O3

FE2O3

FFO

MNO

MGO

CAO

NA20

K2U

P2Q5

H20*

H20-

C02

S03

S

TOTAL

ORIGINAL

ANALYSIS

55.34

.70

16.66

5.50

3.65

.09

3.71

6.96

4.20

1.80

.12

1.01

• 12

.04

0.00

.06

0.00

0.00

0.00

99.96

WATER-C02-FREE

(100.0)

56.05

.71

16.87

5.57

3.70

.09

3.76

7.05

4.25

1.82 »

.12 (

SI

ri

*L

•E3

~t2

IN

It.

:A

4A

ATOMS

WEIGHT

25.85

.42

8.81

3.85

2.84

.07

2.24

4.97

3.12

1.49

.05

.01

.00

.01

0.00

ATOMS

NUMBERS (100.0

20.08

.19

7.13

1.50

1.11

.03

2.01

2.71

2.96

.83

.04

0

CB

OR

AR

AN

NE

LC

AC

NS

01

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO + FECl

IN FEMC S =

WEIGHT NORM

(100.0)

6.03

0.00

10.80

36.06

21.51

0.00

0.00

0.00

0.00

9.91

0.00

5.91

0.00

6.09

0.00

1.35

0.00

0.00

.27

.09

.91

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

.15

0.00

10.91

36.45

21.74

0.00

0.00

0.00

0.00

10.65

0.00

18.37

0.00

0.00

0.00

1.36

0.00

0.00

.27

.09

.47

3-COMPONENT

WT.PERCENTS

F 46.5?

M 19.67

A 31.81

F 41.38

C 31.48

A 27.14

N 32.41

K 13.89

C 53.70
DIORITE (t.ITH lA'-IC >t.vOl ITH' 137)

10.27N 35.O4JE, TULU ,-OjA, LOwLtf DAbUS VALLEY. ftOLLEGA

L. MUHLEN AND J.H. HtLL ifRS, 193h

SILI2

TIU2

AL2U3

FE203

FEO

MHO

Mao

CAU

NA20

K2U

P2O5

H2O*

H2UCOl

SO3

TOTAL

URIC. I .AL

ANALYSIS

56.13

• f,5

14.46

6.63

4.27

.12

2.92

7.64

3.71

1.71

.46

1.39

.or 0.00

o.oo

O.CIO

0.00

0.00

0.00

100.16

wATER-C02-FREE

(loo.o)

56.87

.66

14.65

6.72

4.33

.12

2.96

7.74

3.76

1.73

.47

SI

Tl

AL

FE3

F£2

MN

Mb

CA

NA

K

P

H*

HC

S

ATOMS

HEIGHT

26.22

.39

7.65

4.64

3.32

.09

1.76

5.46

2.75

1.42

.20

.02

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

20.56

6

1

1

1

3

2

18

24

R3

31

04

60

00

64

HO

14

Q

ca

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H^1

IL

TI

RU

AP

CC

MGO/MCOtFEO

I ,M FtnlCS =

«.£.IGHT N0'!M

(100.0)

11.53

0.00

10.26

31.67

17.94

0.00

0.00

0.00

0.00

14.14

0.00

2. 22

0.00

9.76

0.00

1.25

0.00

0.00

1.02

0.00

.86

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

4.50

0.00

10.40

32.29

18.IB

0.00

0.00

0.00

0.00

15.34

0.00

17.00

0.00

0.00

0.00

1.27

0.00

0,00

1.03

0.00

.36

NIGGLl

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

163

24.7

37.8

23. «

13.6

.2

.3

1.4

.5

.6

8

3-C0MP0NENT

WT.PERCENTS

F 56.65

M 15.18

A 28.17

F 45.49

C 31.89

A 22.62

N 78.41

K 13.09

C 58.50

No. 143

REMARKS: Analysis of host material to basic inclusions

(see no. 137).

MINERALOGY: Fine-grained with schlieren. Groundmass: An60-35, hastingsite, chloritised biotite, augite,

large magnetite; some titanite, apatite, zircon.

OTHER INFORMATION: Specific gravity 3. 135.

No. 144

MINERALOGY: Phenocrysts: Large bluish quartz, with

undulose extinction, and apatite inclusions. Groundmass:

Bluish quartz, andesine, dark biotite; accessory orthoclase, muscovite, augite.

OTHER INFORMATION: Specific gravity 2. 679; this

rock-type forms a 1 X 2 km massif associated with some

diorite.

No. 145

MINERALOGY: Groundmass: Dominant microcline,

quartz, oligoclase, biotite, augite, apatite.

OTHER INFORMATION: Specific gravity 2.641; this rocktype forms a 9 X 6 km massif.
144

RIOTITE GRANITE

10.27N 35.08E. TULU LtOJA, LOWER DABUS VALLEY. WOLLEGA

L. MUHLEN AND J.H. HELLMEKS. 1936

SIO2

TIO2

AL2O3

FE2O3

FEU

MNO

MGO

CAO

NA2O

K2O

P2O5

H20*

H2OCO2

503

TOTAL

ORI&IMAL

ANALYSIS

69.24

.02

16.08

1.05

2.11

0.00

.39

3.95

3.95

1.86

.05

.89

.17

.13

.14

0,00

o.oo 0.00

0.00

100.03

wATER-CO2-FRtE

(100.0)

70.15

.02

16.29

1.06

2.14

0.00

.40

4.00

4.00

1.88

.05

SI

TI

AL

FE.3

FE2

HN

Mo

CA

NA

K

P

Ht

HC

ATOMS

WEIGHT

32.35

.01

8.51

.73

1.64

0.00

.24

2.82

2.93

1.54

.02

.01

.00

.04

ATOMS

NUMBERS (100.0)

24.23

.01

6.63

.28

.62

0.00

.20

1.48

2.68

.83

.01

Q

CB

OR

AH

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HI

IL

TI

RU

AP

CC

MGO/MGO+f EG

IN FEMCS =

WEIGHT NORM

(100.0)

29.42

.77

11.15

33.91

1U.75

0.00

0.00

0.00

0.00

0.00

o.oo

4.00

o.oo l.f>4

0.00

.04

o.oo

0.00

.11

.30

.30

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

28.35

.77

11.18

33.98

18.79

0.00

0.00

0.00

0.00

0.00

0.00

6.48

0.00

0.00

0.00

.04

0.00

0.00

.11

.30

.19

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 33.76

M 4.17

A 62.07

F 24.46

C 30.57

A 44.97

N 40.47

K 19.06

C 40.47

145

RIOTITE bPANlTL

10.ION 35.1OE. TULU FAGUEDDO , DABJS VALLEY ,

L. MUHLEN AND J.H. HELLiiERS, 193(.

SI02

TIU2

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

74.84

.01

12.73

.88

1.32

0.00

.30

.94

5.79

1.98

.04

.78

.14

.09

.11

0.00

0.00

0.00

0.00

99.95

\»ATER-C02-FREE

(100.0)

75.73

.01

12.88

.89

1.34

0.00

.30

.95

5.86

2.00

.04

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H+

HC

S

ATOMS

*EI6HT

34.97

6

1

0

4

1

01

74

62

03

00

ia

67

30

64

02

01

00

02

04

AT0M5

NUMBERS (100.0)

25.82

.00

5.18

.23

.38

0.00

.15

.35

3.88

.87

.01

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

WcIGHT NOi:M

(100.0)

31.10

0.00

11.86

49.66

2.B6

0.00

0.00

0.00

0.00

.89

0.00

2.01

0.00

1.29

0.00

.02

0.00

0.00

.09

.21

.37

NON-OXIDATION NORM

(FE2O3 CONVFRTED TO FEO)

30.21

0.00

11.88

49.75

2.87

0.00

0.00

0.00

0.00

.91

0.00

4.06

0.00

0.00

0,00

.02

0.00

0.00

.09

.21

.21

C

ALK

K

TI

P

C/FM

uz

5.7

39.1

.18

.20

.0

.10

.45

168

3-COMPONENT

WT.PERCENTS

F 21.42

M 2.92

A 75.66

F 20.16

C 8.6?

A 71.22

N 66.48

K 22.73

C 10.79
CHLORlTE-MAoNETITE SCHlbT (MoNETITE REMOVED)

9.08N 3S.3OE. nO*TA STPEAt», NEAR YUBDO, ki

P. COnUCCI. 19*8

SI 02

TIG2

AL203

FE2O3

FEO

MNO

MGU

CAO

NA20

K20

P2O5

H2G*

H20-

C0<:

503

TOTAL

ORIC-INAL.

ANALYSIS)

27.12

1.52

25.63

0.00

6.80

.14

25.42

0.00

.28

.90

.?H

11.59

.64

0.00

0.00

0.00

0.00

0.00

0.00

100.32

WATER-C02-FREE

(100.0)

30.79

1.73

29.10

0.00

7.72

.16

28.86

0.00

.32

1.02

.32

SI

Tl

AL

Ft3

FE2

Mil

MG

CA

NA

K

P

H-f

HC

S

0

ATOMS

WEIGHT

12.67

.91

13.56

0.00

5.29

.11

15.33

0.00

.21

.75

.12

.14

.01

0.00

0.00

51.23

ATOMS

NUMBERS (100.0)

10.79

.46

12.02

0.00

2.27

.05

15.10

0.00

.22

.46

.09

58.55

N0R.-1 P205 EXCESS

0

CT

OR

AB

AN

NE

LC

AC

NS

CI

WO

HY

OL

MT

H"'

IL

TI

RU

AH

CC

IN FLMCS =

.28

hfclOHT NOr.M

(100.0)

0.00

27.46

6.05

2.69

0.00

0.00

0.00

0.00

0.00

0.00

0.00

2.66

57.54

0.00

0.00

3.27

0.00

0.00

0.00

0.00

.89

.28

NON-OXIDATlUN NORM

(FE2O3 CONVERTED TO FEO)

0.00

27.46

6.05

2.69

0.00

0.00

0.00

0.00

0.00

0.00

0.00

2.66

57.54

0.00

0.00

3.27

0.00

0.00

0.00

0.00

.89

NIGGLI

SI

AL

FM

C

AL<

K

MG

TI

P

C/FM

OZ

45

25.3

73.3

0.0

1.4

.6

.8

1.9

.1

0.0

-60

3-COMPONENT

WT.PERCENTS

F 20.36

M 76.11

A 3.53

F 85.21

C 0.00

A 14.79

76.27

0.00

No. 146

REMARKS: Fe O and CaO traces.

MINERALOGY: Phenocrysts: 1-mm magnetite crystals

(removed prior to analysis). Groundmass: Yellow-green

fibrous chlorite, with some magnetite.

No. 147

REMARKS: No separate determination of H-O-; ^2

O

5

trace.

MINERALOGY: Groundmass: Serpentinised olivine

(2V = 90°); abundant large magnetite, and minute second

generation associated with lines of serpentinisation; rare

bronzite.

No. 148

MINERALOGY: Rather coarse-grained. Groundmass:

Actinolite-hornblende (pleochroic: yellow-brown — pale

green — blue green) subordinate to non-pleochroic augitic

diopside (with iron oxides along cleavages), common

magnetite and ilmenite with titanite rims, accessory

titanite, and rare zoisite; no olivine.
1*7

TMJNITE

0B.57N 35.28 . fc YUBDO, wOLLF.GA

P. COMUCCI. 1948

S1O2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

SO3

CMOS

KIIO

TOTAL

ORIGINAL

ANALYSIS

37.70

.10

0.00

4.34

5.10

.20

44.27

0.00

0.00

0.00

0.00

8.00

0.00

0.00

0.00

.32

.43

0.00

0.00

100.46

«ATER-C02-FREE

41.11

.11

0.00

4.73

5.56

.22

48.27

0.00

0.00

0.00

0.00

(100.0)

SI

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

17.61

.06

0.00

3.04

3.96

.15

26.70

0.00

0.00

0.00

0.00

.10

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

14.36

.03

0.00

1.25

1.63

.06

25.17

0.00

0.00

0.00

0.00

0

CB

OR

AB

AN

NE

LC

AC

NS

01

MO

HY

OL

MT

H*

IL

TI

RU

AP

CC

MGO/MG0*FE0

IN FEMC S s

WEIGHT NORM

1100.0)

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

11.89

SI.03

6.67

0.00

.21

0.00

0.00

0.00

0.00

.96

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

3.53

96.26

0.00

0.00

.21

0.00

0.00

0.00

0.00

.90

cALK

K

MG

TI

P

C/FM

02

0.0

0.0

I

.90

.1

0.00

0.00

-49

3-COMPONENT

WT.PERCENTS

F 17.5R

M 82.42

A 0.00

F 100.00

C 0.00

A 0.00

148

PYROXENE HOHNULENDITE

9.00N 35.58Ei MILL

P. COMUCCI. 194B

S. OF ADASlNA, E. OF GHlMBl. WOLLEGA

SI02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

SO 3

TOTAL

ORIGINAL

ANALYSIS

40.56

3.62

1.70

18.98

5.16

.37

11.70

13.88

1.03

1.05

.39

1.30

.42

0.00

0.00

0.00

0.00

0.00

0.00

100.16

I.ATER-C02-FKEE

(100.0)

41.20

3.68

1.73

19.28

5.24

.38

11.89

14.10

1.05

1.07

.40

SI

TI

At

Ft3

FE2

MN

MG

CA

NA

<

P

H*

HC

s

ATOMS

WEIGHT

18.95

2.17

.90

13.27

4.01

.29

7.06

9.92

.76

.87

.17

.02

.00

0.00

0.00

AT0M5

NUMBERS (100.0

16.17

1

5

1

6

5

09

80

70

72

13

96

93

RO

53

13

NORM SI02 DEFICIT 0.00

LIGHT IMORK

(100.0)

0.00

0.00

6.31

2.93

0.00

TI

PJ

AP

CC

MGO/MGO*FLO

IN FtMICS =

0.00

0.00

.67

0.00

1.00

-1.25

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

0.00

0.00

0.00

1.65

5.14

0.00

1.43

58.39

0.00

0.00

26.57

0.00

0.00

7.24

0.00

0.00

.90

o.oo

.54

FM

C

ALK

K

MG

TI

P

C/FM

OZ

67.

27.

3.

5.

-34*

3-COMPONENT

WT.PERCENTS

F 63.66

M 30.85

A 5.49

F 60.20

C 34.61

A 5.19

6.58

86.97
9.05H 35.53E.

P. C0MUCC1. 1948

OF GHI'CI , l.OLLEGA

SIO2

TIU2

AL2O3

FE2O3

FEO

MMU

MC.L)

CAU

NA2O

K?O

P2O5

H2O+

H?OCO2

SOJ

TOTAL

OkICI.\'A|_

ANALYSIS

4B.60

.10

22.33

2.70

<t.C8

.06

6.64

11.0<t

3.07

.98

.01

.90

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.51

»«ATER-C02-rKtE

(100.0)

48.79

.10

22.42

2.71

4.10

.06

6.67

11.08

3.0e

.98

.01

SI

Tl

AL

Ft3

FE2

MN

M6

CA

NA

K

P

H»

HC

S

0

ATOMS

*EIGHT

22.71

.06

11.81

1.89

3.17

.05

4.01

7.89

2.28

.81

.00

.01

0.00

0.00

0.00

45.82

ATOMS

NUMBERS (100.0)

17.46

.03

9.4$

.73

1.23

.02

3.56

4.25

2.14

.45

.00

60.68

0

C'i

o«

An

AN

NE

LC

AC

NS

01

wo

HY

OL

Mf

H

:/

IL

TI

RU

AP

cc

IN FEI-UC5 =

rttlGHT NOkM

(100.0)

0.00

0.00

5.P.3

22.19

44.39

2.13

0.00

0.00

0.00

6.53

0.00

0.00

12.78

3.94

0.00

.19

0.00

0.00

.02

0.00

.81

NON-OX I DAT I ON NORM

(FE2O3 CONVEKTED TO FEO)

0.00

0.00

5.86

19.17

44.62

3.84

0.00

0.00

0.00

8.75

0.00

0.00

17.54

0.00

0.00

.19

0.00

0.00

.02

0.00

.65

NIG6LI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

110

29.9

35.0

26.9

8.2

.17

.64

.1

.01

.77

-23

3-COMPONENT

WT.PERCENTS

F 38.HI

M 38.01

A 73.18

F 31.00

C 50.4B

A 18.57

N 20.34

K 6.49

C 73.16

No. 149

MINERALOGY: Phenocrysts: Fresh An65. Groundmass:

Labradorite, colourless fresh olivine with keliphitic rim

(radiating fibres of tremolite may occasionally occupy the

whole olivine crystal) and associated with magnetite, rare

pale-rose hypersthene, tremolite in veins in plagioclase.

No. 150

REMARKS: In Comucci's end-table SiC>2 is given as

49.43% and the summation as 100. 35%.

MINERALOGY: Very fine-grained. Groundmass:

Irregularly oriented actinolite fibres (weakly pleochroic);

some chlorite; rather rare epidote, altered in part to

ferric oxide; accessory titanite, magnetite, plagioclase.

No. 151

MINERALOGY: Medium-fine-grained melanocratic.

Groundmass: Zoned An52 — An45, fresh or epidotised;

hornblende, with inclusions of iron-oxide and feldspar;

small epidote and zoisite; titanite, sometimes as rims

to ilmenite.
150

AMPHldOLlTE

9.04N 35.37E.

P. COMUCCI. 1948

HEAD OF KILIMT C RlvER. NE OF YUtJOO, WOLLEGA

SI02

T102

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K2U

P2O5

H20*

H20-

C02

S03

ORIGINAL

ANALYSIS

49

9

3

6

11

14

1

1

0

0

46

64

6 2

88

76

22

82

48

01

19

60

58

08

00

00

(.ATER-C02-FHEE

(100.0)

49.62

.64

9.65

3.89

6.78

.22

11.86

14.53

1.01

1.19

.60

SI

Tl

AL

FE3

Ffc.2

MN

MG

CA

NA

K

P

ATOMS

•EIGHT

23.11

.38

5.09

2.71

5.25

.17

7.13

10.35

.75

.99

.26

ATOMS

NUMBERS (100.0)

18.27

.18

4.19

1.08

2.09

.07

6.52

5.73

• 72

.56

.19

.00

0.00

0.00

0

CB

OR

AR

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RO

AP

CC

MGO/MGCu-FEO

IIM FfchlCS =

WEIGHT MORM

(100.0)

0.00

0.00

7.07

8.59

18.24

0.00

0.00

0.00

0.00

40.29

0.00

14.25

3.37

5.65

0.00

1.22

0.00

0.00

1.32

0.00

.82

NON-OX 1 DAT ION NORM

(FE2O3 CONVERTED TO FEO)

0,00

0.00

7.12

8.65

18.37

0.00

0.00

0.00

0.00

41.35

0.00

7.32

14.63

0.00

0.00

1.23

0.00

0.00

1.33

0.00

.69

NlGGLl

100

11.5

53.5

31.5

3.5

.44

.67

3-COMPONENT

WT.PERCENTS

F 43.15

M 47.91

A 8.92

F 38.95

C 53.00

A B.05

N 6.06

K 7.13

C 86.81

151

0I0R1IE PcABriRO"

9.00N 35.30E,

P. C0MUCC1. 1948

OALATTI, KONTUHl VALLEY « E. OF YUBJO, wOLLEiA

SI 02

TI02

AL203

FE2O3

FEU

MNO

MGO

CAO

NA20

K20

P2O5

H20 +

H20-

C02

S03

T01AL

ORIGINAL

ANALYSIS

50.01

1.20

15.45

5.49

5.46

.15

6.75

11.08

2.70

.43

.43

.95

.28

0.00

0.00

0.00

0.00

o.oo

0.00

100.38

*ATER-C02-F«EE

(loo.o)

50.44

1.21

15.58

5.54

5.51

.15

6.81

11.17

2.72

.43

.43

SI

Tl

AL

Ft3

Ft2

MN

Mt.

CA

NA

K

P

Ht

HC

s

ATOMS

HEIGHT

23.36

.72

8.17

3.84

4.24

.12

4.07

7.92

2.00

.36

.19

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0

18

6

1

1

3

4

1

38

33

69

52

68

05

70

37

93

20

13

0

C1

OR

AR

AN

NE

LC

AC

NS

Dl

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGOtFEO

IN FEMICS =

WEICHT NORM

(100.0)

3.22

o.oo 2.57

23.09

28.98

0.00

0.00

0.00

0.00

19.10

0.00

11.75

0.00

8.05

0.00

2.30

0.00

0.00

.95

0.00

.85

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

2.60

23.33

29.29

0.00

0.00

0.00

0.00

20.08

0.00

14.01

7.41

0.00

0.00

2.32

0.00

0.00

.96

0.00

.57

c

ALK

C/FM

OZ

3-COhPONENT

WT.PERCENTS

F 52.57

M 32.41

A 15.03

F 43.52

C 44.04

A 12.44

N 19.00

K 3.03

C 77.97
152

BASIC QUAfcTZ JlORlTE

8.58N 35.2BE. UILLO

P. COMUCC1. 1948

iTPEAi, U. OF YUBDO. wOLLtGA

SIU2

TIO2

AL2O3

FE2O3

FEO

MNO

MGU

CAO

NA2O

K2U

P2O5

H2U*

H2GCO2

503

TOTAL

0

CR

OR

AP

AN

NE

LC

AC

NS

DI

WO

HY

OL

fj

H»

IL

TI

RJ

CC

MGO/MdO + t to

I.N FEhlCS =

ORI&INAl

ANALYSIS

52.24

2.75

14.B5

3.38

5.71

.11

4. 39

O.92

3.68

3.80

1.35

1.06

.OS

0.00

0.00

0.00

o.oo U.OO

0.00

100.32

WEIGHT I-.OKM

(100.0)

0.00

0.00

22.69

31.46

U.82

0.00

0.00

0.00

0.00

11.08

0.00

7.71

1.04

4.95

0.00

5.26

0.00

0.00

2.98

0.00

.81

»jATER-C02-FKEE

(100.0)

52.67

2

14

3

5

4

6

3

3

1

77

97

41

76

11

43

98

71

83

36

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0,00

22.84

31.67

12.91

0.00

0.00

0.00

0.00

11.55

0.00

1.45

11.29

0.00

0.00

5.30

0.00

0.00

3.00

0.00

.56

SI

TI

AL

Ft3

Ffc2

MN

M&

CA

NA

tc

P

H*

HC

S

0

ATOMS

WEIGHT

24.41

1.65

7.86

2.36

4.44

.09

2.65

4.95

2.73

3.15

.59

.01

.00

0.00

0.00

45.44

NIGGLl

SI

AL

FM

C

ALH

K

MG

TI

P

C/FM

QZ

ATOMS

NUMBERS

19.14

.76

6.41

.93

1.75

.03

2.40

2.72

2.62

1.78

.42

6V.03

144

24.2

38

20

16

5

1

7

5

6

40

47

7

58

53

-22

(100.0)

3-C0MP0NENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

U.I.

43.37

20

35

38

29

11

25

?6

48

94

69

70

4b

84

56

39

Oh

67.43

No. 152

MINERALOGY: Medium-fine grained, melanocratic.

Groundmass: Rather uncommon, sericitised An27-25;

dominant, large laths of biotite; common hornblende;

rather common, irregular grains of titanite; large

crystals of apatite, magnetite, ilmenite; accessory

quartz (mosaic), calcite, epidote.

No. 153

REMARKS: Occurs near Merech, at the Botteji river

and "Tulu Soiaiona. "

MINERALOGY: Variable grain-size, slightly cataclasised.

Groundmass: Orthoclase, more abundant than microcline

(shows myrmekite with albite); large sub-parallel

muscovite (undulose extinction) associated with mediumsized, abundant biotite; rather common epidote; large

irregular grains of magnetite; accessory zoisite, orthite,

zircon; no quartz.

No. 154

REMARKS: Situated on the "Mora-Gudi-Karavayon"

track.

MINERALOGY: Medium-grained, melanocratic. Groundmass: Quartz in mosaic aggregate (straight extinction);

abundant biotite in aggregates; large magnetite and

ilmenite; accessory apatite, titanite, orthoclase(?).
153

SYENITE

P. COMUCCI, 194B

TULU iiOTTEJl. ,OLLEGA

S1O2

TIO2

AL2O3

FE2O3

FED

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

503

TOTAL

URI&INA L

ANALYSIS

55.76

.14

22.71

3.36

1.28

.06

.09

1.60

5.43

8.43

.07

1.06

.44

0.00

0.00

0.00

0.00

0.00

0.00

100.43

56.36

.14

22.96

3.40

1.29

.06

.09

1.62

5.49

8.52

.07

SI

Tl

AL

Ft 3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

KEIGH T

26.05

.08

12.02

2.35

.99

.05

.05

1.14

4.03

7.00

.03

.01

.01

0,00

0,00

ATOMS

NUMBERS (100.0)

19.97

.04

9.59

.91

.38

.02

.05

.61

3.77

3.86

.02

NE

LC

AC

NS

DI

MO

0.00

1.87

50.48

20.91

7.63

13.89

NORM

(100.0)

IL

TI

RU

AP

CC

MG0/M6O+FE0

IN FEMICS =

0

0

0

1.

.27

.00

.00

.15

.00

oo

NON-OXIDATIUN NORM

(FE2O3 CONVERTED TO FEO)

0.00

1.88

50.81

17.39

7.68

15.96

0.00

0.00

0.00

0.00

0.00

0.00

5.85

0.00

0.00

.27

0.00

0.00

.16

0.00

.04

SI

AL

FM

C

ALK

K

188

45.3

12. 8

5.8

36.1

.51

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

24.96

.48

74.56

23.0ft

7.96

68.96

35.12

54.53

10.35

154

QUARTZ DIGRITE

8.45N 35.OOE,

P. COMUCCI< 1948

UARMAY STREAM, C. 40KM M. OF YU3C0, WOLLEGA

SI02

TIU2

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2U5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

65.67

.36

17.26

2.46

1.65

.05

1.17

3.24

5.74

1.84

.14

.79

.12

0.00

0.00

0.00

0.00

0.00

0.00

100.49

WATER-C02-FREE

(100.0)

65.95

.36

17.33

2.47

1.66

.05

1.17

3.25

5.76

1.85

.14

SI

Tl

AL

FE3

FE2

MN

MG

CA

NA

<

P

H*

HC

S

ATOMS

WEIGHT

30.68

.22

9.13

1.72

1.28

.04

.71

2.32

4.26

1.53

.06

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

22.84

7

1

3

09

08

65

48

OlJ

61

21

R7

82

04

0

CB

OR

AB

AN

NE

LC

AC

NS

01

MO

HY

OL

MT

HM

IL

TI

RU

AD

CC

MGO/MGO*FtO

IN FEMICS =

* EIGHT r!ORt-i

(100.0)

16.58

.20

10.95

48.90

15.36

0.00

0.00

0.00

0.00

0.00

0.00

3.43

0.00

3.59

0.00

.69

0.00

0.00

.31

0.00

.88

NON-OXI DATI Oh NORM

(FE2O3 CONVERTED TO FEO)

14.03

.20

11.00

49.13

15.43

0.00

0.00

0.00

0.00

0.00

0.00

9.20

0.00

0.00

0.00

.69

0.00

0.00

.31

0.00

.38

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

258

40.0

19. H

13.7

26.6

.17

.35

1.1

.23

.69

52

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

31.96

9.10

58.94

27.53

21.70

50.77

53.05

17.01

29.94
155

i.IOTITE SCHIST

9.O3U 35.36E. KART A RIvfR. C.AN.Jl-KApI FORD.

P. COrtUCCl. 19*.8

SI02

TI02

AL2O3

FE203

FEO

MNO

«<&O

CAO

NA20

<2O

P2O5

H2O +

H2OCD2

SO3

OKI&IhAi

ANALYSlb

66.32

.22

15.57

2.75

3.01

.07

• 81

4.1?

4.09

2.78

.16

• 6fl

.10

0.00

0.00

0.00

WATEK-C02-FHEE

(100.0)

66.39

.22

15.59

2.75

3.01

.07

.81

4.12

4.09

2.78

.16

SI

TI

AL

Ft3

Ft2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

HEIGHT

30.98

.13

8.24

1.92

2.34

.05

.49

2.94

3.03

2.31

.07

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0

23.28

6

1

2

1

.06

44

.73

89

02

42

55

79

25

05

0

CT

OR

A3

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+HEO

IN FEMC S :

WE.I6HT NORM

(100.0)

21.53

0.00

16.49

34.73

15.88

0.00

0.00

0.00

0.00

3.09

0.00

3.50

0.00

4.00

0.00

.42

0.00

0.00

.35

0.00

.47

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

18.72

0.00

16.58

34.91

15.97

0.00

0.00

0.00

0.00

3.21

0.00

9.83

0.00

0.00

0.00

.42

0.00

0.00

.35

0.00

.22

263

36

3-COMPONENT

WT.PERCENTS

F 42.86

M 6.03

A 51.12

F 34.39

C 24.60

A 41.01

N 37.22

K 25.30

C 37.49

No. 155

MINERALOGY: Rather fine-grained, not strongly

laminated. Groundmass: Abundant biotite, oriented in

various-sized grains, of maroon colour; extremely fine- commoner than dark, chloritised amphibole; accessory

large with slightly undulose extinction. Groundmass:

Kaolinised orthoclase and microcline (perthite and antiperthite); rather uncommon albite; large biotite,

grained quartz-feldspar mosaic; rare yellow garnet,

apatite.

No. 156

REMARKS: Summation given as 100.19 in end-table; the

SiO, value is 68. 54%; MnO trace.

MINERALOGY: Phenocrysts: Large corroded orthoclase

(but some perthite and some plagioclase twinning — optic

angle quoted as "not small"). Groundmass: Microfelsitic;

some devitrified glass with abundant magnetite in fluidal

arrangement; abundant minute quartz; some muscovite,

biotite, epidote.

No. 157

REMARKS: Given as 15 km "east" of Yubdo, from

Sotello and Jauri (same as Aleltu-Meti?) streams.

MINERALOGY: Rather coarse-grained, aggregated

femics; no lamination. Phenocrysts: Rare quartz, very

titanite, magnetite, epidote, apatite, and low-refractive

index mineral "sodalite(?).
156

MlCROGRAMITE a|.,£TARHYOLlTE«

9.06N 35.2»E. KARTA RIVER , NE OF YUBDO,

P. COMUCCI« 194B

SIO2

TIO2

AL2O3

FE2O3

FEU

MNO

MGO

CAO

NA20

K2O

P2O5

H2O +

H2OCO2

503

TOTAL

ANALYSIS

68.64

.50

15.41

3.43

.36

0.00

• 38

.07

4.29

5.78

.14

.67

• 32

0.00

0.00

0.00

o.oo 0.00

0.00

99.99

WATER-C02-FREE

(100.0)

69.33

.51

15.57

3.46

.36

0.00

.38

.07

4.33

5.84

.14

SI

TI

AL

Ft3

Ft2

MN

CA

NA

K

P

H+

HC

5

ATOMS

WEIGHT

32.07

.30

B.15

2.40

.28

0.00

.23

.05

3.18

4.80

.06

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.01

24.08

6

0

2

2

13

37

91

11

00

ZO

03

92

59

04

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

PU

AP

CC

WEIGHT NORM

(100.0)

21.03

2.09

34.60

36.76

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.96

0.00

0.00

3.47

.77

0.00

.10

.13

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

18.88

2.10

34.83

37.01

0.00

0.00

0.00

0.00

0.00

0.00

0.00

6.00

0.00

0.00

0.00

.97

0.00

0.00

.13

0.00

IN FEMICS = 1.0 0

c

ALK

C/FM

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

26.62

2.67

70.7?

27.21

.50

72.29

4Z.41

57.00

HORNBLENDE-BlOTITb GRA.NITT

8.47H 35.30E. 15<M S. OF vtJBUO.

P. COMUCCI, 1948

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20+

H2UC02

S03

CL

-0

TOTAL

ORIGINAL

ANALYSIS

66.74

.22

14.36

1.67

1.65

.03

.17

.86

4.72

6.80

.32

.55

.18

0.00

.55

.03

0.00

0.00

-.01

100.84

WATER-C02-FKEE

(100.0)

69.06

.22

14.43

1.68

1.66

.03

.17

.86

4.74

6.83

.32

SI

T]

AL

Ft3

Ffc2

MN

MG

CA

NA

K

P

H*

ATOMS

WEIGHT

32.12

.13

7.60

1.17

1.28

.02

.10

.61

3.50

5.64

.14

.01

ATOMS

NUHBERS (100.0

24.10

5

3

3

06

93

44

4B

01

09

32

21

04

09

0

CR

OR

AB

AN

NE

LC

AC

NS

0!

woHY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MCi(J*FEO

IN FEMICS =

WEIGHT NOf-'M

(100,0)

14.22

0.00

40.48

36.10

0.00

0.00

0.00

3.63

0.00

2.09

0.00

1.73

0.00

.62

0.00

.42

0.00

0.00

.70

0.00

.19

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

14.38

0,00

40.61

36.22

0.00

0.00

0,00

0.00

.96

2.12

0.00

4.57

0.00

0.00

0.00

.42

o.oo 0.00

.71

o.oo

.10

SI

AL

FH

c

ALK

K

MG

TI

323

39.8

13. 8

4.3

42.1

.4

.0

. H

3-COMPONENT

WT.PERCENTS

F 22.12

38.13

54.93

6.95
158

HIOTITE GKAI.1TL

9.O2N 36.05E .

P . COMUCCI, 1948

TULU KLLLA, KAKTA VALLEY» fcOLLFGA

SI02

TIJ2

AL2O3

FE203

FF.u

KNO

MGO

CAO

NA2O

IC2U

P2O5

H2O*

H2Oco<: SO 3

TOTAL

Q

a

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H*

IL

TI

RU

An

CC

IN FLe K i =

ORIGINAL

ANALYSIS

68. R4

.56

13.71

1.22

2.35

.07

.76

2.01

3.69

6.29

0.00

.57

.18

0.00

0.00

o.oo

o.oo 0.00

0.00

100.25

(.LIGHT f,Oi(M

(1U0.0)

18.31

0.00

37.46

31.46

2.20

0.00

0.00

0.00

0.00

6.55

0.00

1.16

0.00

1.7B

0.00

1.07

0.00

0.00

O.OO

0.00

.50

fcATER-COz-FREE

(100.0)

69.19

.56

13.78

1.23

2.36

.07

.76

2.02

3.71

6.32

0.00

NON-OXIDAT ION NORM

(FE2O3 CONvEHTED TO FEO)

17.05

0.00

37.55

31.53

2.21

0.00

0.00

0.00

0.00

6.73

0.00

3.86

0.00

0.00

0.00

1.07

0.00

0.00

0.00

0.00

.32

SI

TI

AL

FE3

FE.2

MN

Mb

CA

NA

K

P

H«

HC

5

0

ATOMS

WEIGHT

32.16

.34

7.25

.85

1.83

.05

.46

1.44

2.74

5.22

0.00

.01

.00

0.00

0.00

47.90

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

02

ATOMS

NUMBERS

24.23

.15

5.69

.32

.69

.02

.40

• 76

2.52

2.A3

0.00

62.39

314

3 6 . b

18

9

34

1

0

6

8

7

53

2R

00

53

75

(100.0)

3-C0MP0NENT

WT

F

M

A

F

C

A

N

K

C

O.I.

PERCENTS

74.95

5.31

69.74

22.94

12.92

64.14

30. 7R

52.46

16.76

82.45

No. 158

REMARKS: P2O5 and Cl traces.

MINERALOGY: Variable grain-size. Groundmass: Kfeldspar commoner than plagioclase; microcline commoner than orthoclase; microcline occurs as large

crystals with undulose extinction, the orthoclase is

sericitised; albite, with muscovite lamellae and antiperthite; large quartz, with inclusions; abundant biotite

(altered to chlorite and epidote) with pleochroic haloes,

some associated muscovite; accessory titanite,

magnetite, epidote, calcite.

No. 159

REMARKS: TiO2 and H2O- traces; specimen collected

from 4 km west of Uris River bridge.

MINERALOGY: Medium grained, femics equal mafics in

abundance. Groundmass: Microcline (some orthoclase?)

with anti-perthite; abundant myrmekite, vermicularitised

at contact; abundant An29-22 in rather large plates;

large rounded quartz, slightly undulose extinction;

pleochroic hornblende, more common than chloritised

biotite, both in large crystals; rare large magnetite;

rather common apatite; scarce titanite, zircon, epidote.

No. 160

REMARKS: No separate determination of FeO; MnO and

PpOg traces; specimen collected from right bank of

stream, 1/2 km SE of bridge.

MINERALOGY: Fine-grained, saccharoidal, mafic rock.

Groundmass: Small albite-oligoclase, and small quartz

(undulose extinction) in mosaic; subordinate muscovite;

no orthoclase, no biotite.
159

HORNBLENDE URANI T

8.55N 36.12E,

P. COMUCCI, 1948

BlRUIK VALLEY. S. OF YUBDO» wOLLEliA

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAD

NA2O

K2O

P2O5

H2O*

H2OC02

503

TOTAL

ANALYSIS

70.22

0.00

13.H3

2.47

1.58

.03

1.40

4.56

3.60

2.21

• 13

.47

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.50

WATER-C02-FKEE

(100.0)

70.20

0.00

13.83

2.47

1.58

.03

1.40

4.56

3.60

2.21

.13

SI

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

32.81

0.00

7.32

1.73

1.23

.02

.84

3.26

2.67

1.83

.06

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

24.38

0.00

5.66

.65

.46

.01

.73

1.70

2.42

.98

.04

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MOO-tFEO

IN FfcMICS r

WEIGHT MOPM

(100.0)

30.20

0.00

13.09

30.53

15.01

0.00

0.00

0.00

0.00

5.51

0.00

1.79

0.00

3.59

0.00

0.00

0.00

0.00

.28

0.00

.83

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

27.72

0.00

13.15

30.68

15.08

0.00

0.00

0.00

0.00

5.87

0.00

7.22

0.00

0.00

0.00

0.00

0.00

0.00

.29

0.00

.41

SI

AL

FM

cALK

302

35

22

21

21

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 35.97

M 12.43

A 51.60

F 28.09

C 31.6?

A 40.24

N 34.7?

K 21.31

C 43.97

160

APLIT L

8.ION 34.57Et

P. COMUCCIt 1948

SARITI STREAK, WOLLEGA

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

S03

TOTAL

OHIGINA L

ANALYSIS

76.96

.06

13.64

.48

0.00

0.00

.15

.92

4.04

3.41

0.00

.54

.14

0.00

0.00

0.00

0.00

0.00

0.00

100.34

WATER-COZ-FKEE

(100.0)

77.22

.06

13.69

.48

0.00

0.00

.15

.92

4.05

3.42

0.00

51

Tl

AL

Ft3

Ft2

MN

Mb

CA

NA

K

P

H*

HC

s

ATOMS

teEIGHT

35.96

.04

7.22

.34

0.00

0.00

.09

.66

3.00

2.83

0.00

.01

.00

0.00

0.00

ATOMS

NUMBERS (1O0.0)

26.26

.02

5.49

.12

0.00

0.00

.08

.34

2.67

1.49

0.00

0

CR

OR

AR

AN

NE

LC

AC

NS

01

wo

HY

OL

MT

HM

IL

TI

RU

AC

CC

MG0/M60*Ff:0

IN FEMICS =

fcMGHT NORM

(100.0)

38.20

1.61

20.28

34.40

4.59

0.00

0.00

0.00

0.00

0.00

0.00

• 38

0.00

0.00

.48

0.00

0.00

.06

0.00

o.oo

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

37.95

1.61

20.30

34.43

4.60

0.00

0.00

0.00

0,00

0.00

0,00

I.00

0.00

0,00

0.00

.11

0.00

0.00

0.00

0.00

.44

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

489

51.

3.

6.

38.

0.

1.

3-COMPONENT

WT.PERCENTS

F 5.94

M 1.86

A 92.20

F 5.42

C 10.40

A 84.18

N 48.27

K 40.74

C 10.99
161

QUARTZ POHP

R.FILJAK, S

r.YKY

K,T.

.QLOM1CIC,

£ T K Oi~

?. 7 AC,

AN. L^

OR AC,

1THLA

1959

SIU2

TI02

AL203

FF2O3

FEU

MNO

MGU

CAU

NA2O

K2O

P2O5

H2O +

H2UCO2

503

TOTAL

UKICINAL

ANALYSIS

5a.91

.5B

17.38

(..29

.34

• Oh

4.K1

2.17

4.99

.94

0.00

3.09

.26

0.00

0.00

0.00

0.00

0.00

0.00

9 9. 82

i,ATER-C02-FKEE

(100.0)

.35

.06

4.99

51

TI

AL

Ft3

FE2

MN

MG

CA

NA

K

P

H+

HC

S

ATOMS

HEIGHT

27.52

.35

9.20

4.40

.26

.05

2,90

1.55

3.70

.78

0,00

.04

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

0

coOR

AB

AN

NF.

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

ccMGO/MGOFEO

IN FtHlCS =

IxtlGhT NOKM

(100.0)

14.P3

4.34

5.77

43.87

11.19

0.00

0.00

0.00

0.00

0.00

0.00

12.45

0.00

0.00

6.54

.ea 0.00

.14

0.00

0.00

1.00

NON-OXlDATION NORM

(FE2O3 CONVERTED TO FEO)

10.64

4.39

5.85

44.43

11.33

0.00

0.00

0.00

0.00

0.00

0.00

22.21

0.00

0.00

0.00

1.16

0.00

0.00

0.00

0.00

.63

NIGGLI

SI

AL

FM

C

ALK

K

MO

TI

P

C/FM

OZ

194

33.8

40.5

7.7

18.0

.1

.5

1.4

0.0

.1

22

3-COMPONENT

WT.PERCENTS

F 38.17

M 27.69

A 34.14

F 45.01

C 14.73

A 40.26

N 61.60

K 11.60

C 26.79

No. 161

MINERALOGY: Phenocrysts: Idiomorphic feldspar,

corroded quartz. Groundmass: Actinolite (chloritised

and epidotised), kaolin, calcite and secondary quartz.

No. 162

REMARKS: SiO2 determined to two significant figures,

A^O, to three significant figures.

MINERALOGY: Mesocratic non-migmatic (metasomatic)

gneiss, medium-coarse grained with granoblastic

texture. Groundmass: Abundant fresh anhedral

An35-15 often as porphyroblastic clots, olive-brown

biotite, feldspathoid (cancrinite or pseudomorphs after

cancrinite, or nepheline); less common fresh nonperthitic microcline; accessory calcite, iron-ore,

apatite, zircon, very rare sphene, allanite,

pyrochlore.

OTHER INFORMATION: Mode:

cancrinite 8.2% biotite 36.7%

plagioclase 48.0% calcite 5.4%

microcline 0.2% apatite 1.5%

No. 163

REMARKS: See under 162. CO, present but not determined.

MINERALOGY: Same as 162.

OTHER INFORMATION: Mode:

nepheline 0.2% biotite 30.7%

cancrinite 14.5% calcite 1.4%

oligoclase-andesine 42.6% zircon 0.1%

microcline 10.0% apatite 0.5%.
BIOTITE-CANCRINITE GNEISS

1O.25N 43.HE . TUG DARKAINLE. SOMALI REPUBLIC

O.C. GELLATLY AND G. HORNUNG, 1968

SIO2

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H20*

H2OCO2

SO3

TOTAL

ORIGINAL

ANALYSIS

48.00

1.40

15.SO

.92

9.26

.36

5.10

6.18

5.04

4.80

.60

2.73

.11

0.00

0.00

0.00

0.00

0.00

0.00

99.60

WATER-C02-FREE

(100.0)

49.61

1.45

16.02

.54

9.57

.37

5.27

6.39

5.21

4.96

.62

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H+

HC

S

0

ATOMS

WEIGHT

22.43

.84

8,20

.36

7.20

.28

3.08

4.42

3.74

3.98

.26

.03

.00

0.00

0.00

44.78

ATOMS

NUMBERS (100.0)

18.17

.40

6.91

.15

2.94

.12

2.88

2.51

3.70

2.32

.19

59.72

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS «

WEIGHT NORM

(100,0)

0.00

0.00

29.38

7.04

5.60

20.11

0,00

0.00

0.00

18.73

0.00

0.00

14.27

.78

0.00

2.75

0.00

0.00

1.36

0.00

.53

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0,00

0.00

29.41

6.43

5.60

20.46

0.00

0.00

0,00

18.79

0,00

0.00

15.20

0.00

0.00

2.75

0,00

0.00

1.36

0.00

• 51

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

120

22.9

40.4

16.7

20.0

.39

.47

2.6

.64

.41

-60

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

c

D.I.

39.56

20,63

39.81

37.91

23.95

38.14

31.46

29.96

38.58

65.73

BIOTITE-CANCRINITE GNEISS

10.25N 43.14E. 1KM WEST OF TUG DARKAINLE, SOMALI REPUBLIC

D.C. GELLATLY AND G. HORNUNG. 1968

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20+

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSI5

52.00

.82

17.90

2.20

6.24

.28

1.80

3.02

6.47

5.02

.34

2.08

.07

0.00

0.00

0.00

0.00

0.00

0.00

98.24

WATER-C02-FREE

(100.0)

54.12

.85

18.63

2.29

6.49

.29

1.87

3.14

6.73

5.22

.35

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

0

ATOMS

WEIGHT

24.29

.49

9.47

1.54

4.85

.22

1.09

2.16

4.80

4.17

.15

.02

.00

0.00

0.00

44.99

ATOMS

NUMBERS (100.0)

19,46

.23

7.90

.62

1.96

.09

1.01

1.21

4.70

2.40

.11

60.32

Q

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO*FE0

IN FEMIC5 *

WEIGHT NORM

(100.0)

0.00

0.00

30.95

27.28

5.08

16.15

0.00

0.00

0.00

7.16

0.00

0.00

7.66

3.33

0.00

1.62

0.00

0.00

.77

0.00

.40

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

31.08

24.75

5.10

17.66

0.00

0.00

0,00

7.30

0.00

0.00

11.71

0.00

0.00

1.63

0.00

0.00

.78

0.00

.30

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

157

31.9

29.7

9.8

28.7

.34

.27

1.9

• 44

.33

-58

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

D.I.

38.84

8.28

52.88

36.78

13.16

50.07

44.59

34.60

20.81

82,42
BIOTITE-RICH BAND FROM NEPHELINE MI6MATITE

10.25* 43.13E* 1KM WEST OF TUG DARKAINLE. SOMALI REPUBLIC

D.C. GELLATLY AND G. HORNUNG, 1966

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H20-

CO2

SO3

TOTAL

Q

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO*FEO

IN FEMICS «

ORIGINAL

ANALYSIS

58.00

.85

19.25

2.65

4.74

.22

.40

1.77

7.40

3.48

.22

.94

.04

0.00

0.00

0.00

0.00

0.00

0.00

99.96

WEIGHT NORM

(100.0)

0.00

.53

20.83

56.02

7.58

4.00

0.00

0,00

0.00

0.00

0.00

0.00

5.03

3.89

0.00

1.63

0.00

0.00

• 49

0.00

• 19

WATER-C02-FREE

(100.0)

58.60

.86

19.45

2.68

4,79

.22

.40

1.79

7.48

3.52

.22

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

,53

20.94

53.20

7.62

5.70

0.00

0.00

0.00

0.00

0.00

0.00

9.87

0.00

0,00

1.64

0.00

0.00

,49

0.00

.10

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

27.10

.51

10.19

1.85

3.68

.17

.24

1.27

5.49

2.89

.10

.01

.00

0.00

0.00

46.47

NlGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

02

ATOMS

NUMBERS (100.0)

20.71

.23

8.10

.71

1.42

.07

.21

.68

5.13

1.59

.07

61.08

197 1

38.6 t

23.0 /

6.5

32.0 f

(-COMPONENT

(T.PERCENTS

39.58

1 2.14

k 58.28

36,68

.24 C 8.83

.09 A S4.29

2.2

.32 N 56.50

.28 » 27.51

•31 C 13.99

94.87

No. 164

REMARKS: See under 162.

MINERALOGY: Foliated, medium grained, mesoleucocratic rock with granoblastic texture. Groundmass:

Dominant fresh anhedral An35, oriented olive-brown

biotite, rather rare fresh poorly-twinned microcline;

accessory zircon, sphene, calcite, pyrochlore, and

co-existing traces of quartz and nepheline.

OTHER INFORMATION: Mode:

oligoclase-andesine 77.4%

microcline 6.9%

biotite 12.5%

No. 165

REMARKS: See under 162. Published summation is

99.39%.

MINERALOGY: Medium grained, leucocratic,

granoblastic rock. Groundmass: Dominant anhedral

untwinned AnlO and interstitial altered nepheline (pinite);

subsidiary potassium feldspar and green biotite;

accessory cancrinite, zircon, pyrochlore.

pyrochlore 0.1%

zircon 1.1%

OTHER INFORMATION: Mode:

nepheline 21.7% microcline

cancrinite 4.8% biotite

albite 57.4% zircon

No. 166

REMARKS: See under 162.

MINERALOGY: Similar to 162 and 163.

7.7%

8.1%

0.3%
LEUCOCRATIC BAND FROM NEPHELINE MlGMATITE

IO.25N 43.13E< 1KM WEST OF TUG DARKA1NLE. SOMALI REPUBLIC

D.C. GELLATLY AND G. HORNUNG. 1968

SI02

TI02

A 1.203

FE2O3

FEO

UNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

503

TOTAL

0

CB

OR

A6

AN

NE

LC

AC

NS

DI

«0

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MG0«FEO

IN FEMICS •

ORIGINAL

ANALYSIS

59.00

• 13

21.BO

1.15

2.52

.12

.40

.97

8.73

2.34

.03

2.10

.22

0.00

0.00

0.00

0.00

0.00

0.00

99.51

WEIGHT NORM

(100.0)

0.00

3.26

14.27

67.03

4.78

4.96

0.00

0.00

0.00

0.00

0.00

0.00

3.66

1.72

0.00

.25

0.00

0.00

.07

0.00

.26

WATER-C02-FREE

(100.0)

60.71

.13

22.43

1.18

2.59

.12

.41

1.00

8.98

2.41

.03

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

3.27

14.30

65.82

4.79

5.71

0.00

0.00

0.00

0.00

0.00

0.00

5.79

0.00

0.00

.25

0.00

0.00

• 07

0.00

.17

SI

TI

*L

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

27.56

.08

11.53

.80

1.96

.09

.24

.69

6.48

1.94

.01

.02

.00

0.00

0.00

48.08

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

ATOMS

NUMBERS

20.95

.03

9.12

.31

.75

.04

.21

.37

6.01

1.06

.01

61.13

214

46,6

13.4

3.8

36.2

.15

.16

• 4

.05

.28

-31

(100.0)

3-COMPONENT

WT,

F

M

A

F

C

A

N

K

C

O.I.

.PERCENTS

24.24

2.64

73.12

23.36

6.17

70.46

72.51

19.44

8.06

90.17

BIOTITE PORPHYROCLASTIC NEPHELINE GNEISS

1O.25N 43.15E. 1KM SE OF HUDUOUREH, SOMALI REPUBLIC

D.C. GELLATLY AND G. HORNUNG* 1968

SI02

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

49.00

1.96

15.40

.77

8.85

• 30

4.50

5.57

4.87

4.75

.45

2.86

• 06

0.00

0.00

o.oo 0.00

0.00

0*00

99.34

WATER-C02-FREE

(100.0)

50.82

2.03

15.97

.80

9.18

.31

4.67

5.78

5.05

4.93

• 47

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

22.89

1.18

8.15

.54

6.88

.23

2.71

3.98

3.61

3.94

.20

.03

.00

0.00

0.00

44.99

ATOMS

NUMBERS (100.0)

18.58

.56

6.88

.22

2.81

.10

2.55

2.26

3.58

2.30

.14

60.01

Q

CB

OR

AB

AN

NE

LC

AC

NS

01

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

M60/MG0»FE0

IN FEMICS •

WEIGHT NORM

(100.0)

0.00

0.00

29.18

13.98

6.28

15.63

0.00

0.00

0.00

16.38

0.00

0.00

12.53

1.16

0.00

3.86

0.00

0.00

1.02

0.00

.53

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

29.22

13.08

6.29

16.15

0.00

0.00

0.00

16.47

0.00

0.00

13.91

0.00

0.00

3.86

0.00

0.00

1.02

0.00

.50

NIGQLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

129

24.0

39.6

15.8

20.5

.39

.45

3.9

.50

.40

-53

3.C0MP0NENT

WT.PERCENTS

F

H

A

F

C

A

N

K

C

D.I.

40,52

18.96

40,52

38,77

22.45

38.77

32.06

31.27

36.67

68.13
167

BIOTITE NEPHELINE SYENITE

10.26N 43.14E, 1KM NW OP HUDUDUREH, SOMALI REPUBLIC

D.C. GELLATLY AND G, HORNUNG. 1968

5102

T1O2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K20

P2O5

H2O*

H2OCO2

SO3

TOTAL

0

CB

OR

AB

AN

NE

LC

AC

NS

01

WO

HV

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS »

ORIGINAL

ANALYSIS

57.00

.13

22.30

1.55

3.02

.12

0.00

1.0!

9.16

4.57

.03

.81

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.74

WEIGHT NORM

(100.0)

0.00

.40

27.37

40,71

5.10

20.49

0.00

0.00

0.00

0.00

0.00

0.00

3.34

2.28

0.00

.25

0.00

0.00

• 07

0.00

0.00

WATER-C02-FREE

(100.0)

57.62

.13

22.54

1.57

3.05

.12

0.00

1.06

9.26

4.62

.03

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

.40

27.45

39.02

5.12

21.53

0.00

0.00

0.00

0.00

0.00

0.00

6.17

0.00

0.00

.25

0.00

0.00

.07

0.00

0.00

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

26.63

.08

11.80

1.08

2.35

.09

0.00

.75

6.80

3.79

.01

.01

0.00

0.00

0.00

46.35

NIGGLI

51

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

ATOMS

NUMBERS

20.13

.03

9.28

.41

.89

.04

0.00

.40

6.28

2.06

.01

60.47

190

44.0

12.7

3.6

39.5

.25

0.00

.3

.04

.30

-68

(100.0)

3-COMPONENT

WT

F

M

A

F

C

A

N

K

C

D.I.

.PERCENTS

24.97

0.00

75.03

23.62

5.43

70.96

61.98

30.92

7.10

100.00

No. 167

REMARKS: See under 162. Published summation is

99.68%.

MINERALOGY: Coarse-grained, leucocratic, subsolvus

type; primary hypidiomorphic-granular texture modified

by regional metamorphism to give sutured or

irregular grain boundaries. Phenocrysts: Subhedral,

slightly altered nepheline. Groundmass: Fresh microcline and microcline-perthite, fresh tabular twinned

An5; accessory green biotite or (less commonly) sodic

amphibole or aegirine-augite; rarer zircon, apatite,

ilmenite, sphene; rare pyrochlore, calcite rimmed with

cancrinite.

OTHER INFORMATION: Mode: (Average for Darkainle

nepheline syenites.)

nepheline 23.0% biotite 5.4%

cancrinite 5.0% calcite 0.4%

albite 37. 7% muscovite 0. 2%

microcline 28.0% natrolite 0.3%

No. 168

REMARKS: See under 162.

MINERALOGY: Same as 167.

No. 169

REMARKS: See under 162.

MINERALOGY: Same as 167.
BIOTITE NEPHELINE SYENITE

1O.24N 43.15E. TUG DARKAINLE. SOMALI REPUBLIC

D.C. GELLATLY AND 0. HORNUNG. 1968

5102

TI02

AL203

FE203

FEO

HNO

MOO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

0

CB

OR

AB

AN

NE

LC

AC

NS

01

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGOtFEO

IN FEMJCS *

ORIGINAL

ANALYSIS

56.26

.08

22.22

1.19

2.76

.12

.12

1.11

9.38

5.26

.07

.69

.14

.71

0.00

0.00

0.00

0.00

0.00

100.11

WEIGHT NORM

(100.0)

0.00

.84

31.39

36.24

.61

23.77

0.00

0.00

0.00

0.00

0.00

0.00

3.47

1.74

0.00

.15

0.00

0.00

.15

1.63

.09

WATER-C02-FREE

(100.0)

57.08

.08

22.54

1.21

2.80

.12

.12

1.13

9.52

5.34

.07

SI

TI

AL

FES

FE2

MN

MG

CA

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

.84

31.46

34.94

.61

24.58

0.00

0.00

0,00

0.00

0.00

0.00

5.63

0.00

0.00

.15

0.00

0.00

.15

1.63

.05

ATOMS

WEIGHT

26.28

.05

11.76

.83

2.15

.09

.07

.79

6.96

4.37

.03

.01

.00

• 19

0,00

46.53

C

ALK

MG

TI

C/FM

OZ

ATOMS

NUMBERS (100.0)

19.95

.02

9.29

.32

.02

.04

.06

.42

6.45

2.38

.02

186

43.3

11.5

3.9

41.2

.27

.05

.2

.10

.34

3-COMPONENT

WT.PERCENTS

F 21.11

M .64

A 78.25

F 20.05

C 5.63

A 74.31

N 59,56

K 33.40

C 7.05

AMPHIBOLE NEPHELINE SYENITE

1O.23N 43.14Et 1KM E. OF TUG DARKAINLE, SOMALI REPUBLIC

D.C. GELLATLY AND G. HORNUNG, 1968

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

503

TOTAL

ORIGINAL

ANALYSIS

60.00

,08

20,90

1.45

2.83

.20

.50

.99

10.83

2.20

0.00

.51

.02

0.00

0.00

0.00

0.00

0.00

0.00

100.51

WATER-C02-FREE

60.01

.08

20.90

1.45

2.83

.20

.50

.99

10.83

2.20

0.00

(100,0)

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

0

ATOMS

WEIGHT

28.03

.05

11.06

I.01

2.20

.15

.30

.71

8.03

1.83

0.00

.01

.00

0,00

0.00

47.13

ATOMS

NUMBERS (100.0)

20,75

.02

8,52

,38

.82

.06

.26

.37

7,27

.97

0,00

60,59

0

CB

OR

AB

AN

NE

LC

AC

NS

01

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO»FEO

IN FEMICS «

WEIGHT NORM

(100.0)

0.00

0,00

13.04

59.64

1.80

17.46

0.00

0.00

0.00

2.68

0.00

0.00

3.11

2.11

0.00

.15

0.00

0.00

0.00

0.00

.28

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

13.07

58.13

1.81

18.42

0.00

0.00

0.00

2.73

0.00

0.00

5.69

0.00

0.00

.15

0.00

0.00

0.00

0.00

.18

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

202

41.5

14.0

3.6

40,2

.12

.17

.2

0.00

.24

-59

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

D.I.

24.03

2.81

73.16

23.39

5.41

71.20

77.25

15.69

7.06

89.54
PYROXENE NEPHELINE SYENITE

10.24N 43.16E. IKM ESE OF HUOUOUREH, SOMALI REPUBLIC

D.C. QELLATLY AND G. HORNUNGt 1968

SIO2

TIO2

*L2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

SO3

TOTAL

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO»FEO

IN FEMICS »

ORIGINAL

ANALYSIS

57.00

1.04

22.70

2.03

.92

.10

0.00

1.20

11.94

2.97

0.00

• 42

.03

0.00

0.00

0.00

0.00

0.00

0.00

100.35

WEIGHT NORM

(100.0)

0.00

0.00

17.61

45.47

0.00

29.71

0.00

.93

0.00

0.00

2.49

0.00

0.00

• 29

1.52

1.98

0.00

0.00

0.00

0.00

0.00

WATER-C02-FREE

(100.0)

57.06

1.04

22.72

2.03

.92

.10

0.00

1.20

11.95

2.97

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

17.68

43.43

0.00

31.03

0.00

0.00

.25

5.35

0.00

0.00

.28

0.00

0.00

1.98

0.00

0.00

0.00

0.00

0.00

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H»

HC

s

ATOMS

WEIGHT

26.63

.62

12.01

1.42

.72

.08

0.00

.86

8.86

2.47

0.00

.00

.00

0.00

0.00

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

p

C/FM

OZ

ATOMS

NUMBERS (100.0)

19.72

.27

9.26

.53

.27

.03

0.00

.45

8.02

1.31

0.00

186

43.8

7.8

4.2

44.2

.14

0.00

2.6

0.00

.54

-89

3-COMPONENT

WT.PERCENTS

F 16.52

M 0.00

A 83.48

F 15.48

C 6.30

A 78.23

N 74.12

K 18.44

C 7.45

D.I. 100.00

No. 170

REMARKS: See under 162. Published summation is

99.35%.

MINERALOGY: Same as 167.

VOLCANIC S

No. 1001

REMARKS: Loss on heating 6.06%.

MINERALOGY: Comucci (1928) reports the Mt. Ganga

basalt as having a groundmass of brown glass with

plagioclase microlites, skeletal olivines, chalcedony?.

OTHER INFORMATION: A specimen of olivine basalt

from Cape Luma, north of As sab, yielded SiO2 50.09%.

The mineralogy was fresh olivine crystals in a glass and

andesine-labradorite groundmass. Manasse (1908)

reports four SiO2 analyses from the Mts. Ganga-Sella

basalts: 49. 30, 50. 32, 49. 42, 50. 20%. (The last of these

is an olivine basalt.) It is difficult to reconcile the SiO2

values of Ricciardi and Manasse, but Manasse's values

are supported by an analysis of Pantanelli (see 1002).

No. 1002

REMARKS: Loss on heating 3.02%.

MINERALOGY: Comucci (1928) reports the Mt. Sella

basalt as phenocrysts of olivine and a groundmass brown

glass with andesine microlites.

OTHER INFORMATION: Pantanelli (1886) obtained SiO2

50. 2% from a very fine-grained, scoriaceous black

basalt of specific gravity 2.96. He describes phenocrysts

of rare olivine set in a groundmass of labradorite,

olivine augite, magnetite, and rare apatite.
1001

PA5ALT SCORIA

13.O2M 42.32E, NT.

L. RICCIARD1 1886

ASSAb, ERITREA

SI02

TI02

AL2O3

FE2O3

FEU

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OC02

SO3

CH2O3

TOTAL

ANALYSIS

45.57

0.00

13.07

6.72

12.43

.21

2.60

6.79

2.04

3.36

.52

6.06

0.00

0.00

0.00

.28

0.00

0.00

0.00

99.85

WATER-C02-FKEE

(100.0)

48.73

0.00

13.98

7.19

13.29

.22

2.99

7.26

2.18

3.59

.56

SI

Tl

AL

FL3

FE2

MN

Mo

CA

NA

K

P

H*

HC

s

ATOMS

•EI&HT

21.29

0.00

6.92

4.70

9.66

.16

1.69

4.85

1.51

2.79

.23

.07

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

18.52

0.00

6.26

2.06

4.23

.07

1.70

2.96

1.61

1.74

• 1H

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGU/MGO*FEO

IN FEMICS =

WEIGHT NOtM

(100.0)

0.00

0.00

21.28

18.49

17.69

0.00

0.00

0.00

0.00

12.91

0.00

12.42

5.55

10.44

0.00

0.00

0.00

0.00

1.22

0.00

.34

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

21.57

17.17

17.93

.85

0.00

0.00

0.00

13.31

0.00

0.00

27.92

0.00

0.00

0.00

0.00

0.00

1.23

0.00

.22

C

A LK

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F 70.02

M 10.24

A 19.74

F 61.10

C 21.67

A 17.23

N 16.74

K 27.56

C 55.70

1002

RASALT LAVA

13.02N 42.34E, MT. SELLA,

L. RICCIAKDI. 1886

ASSAfj, ERITREA

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

SOi

CR2O3

TOTAL

ORIGINAL

ANALYSIS

46.30

0.00

13.44

4.11

12.61

.22

4.42

11.88

2.13

1.94

.59

3.02

0.00

0.00

0.00

.26

0.00

0.00

0,00

100.92

WATER-C02-FKEE

47.42

0.00

13.76

4.21

12.91

.23

4.53

12.17

2.18

1.99

.60

(100.0)

SI

TI

AL

Ft3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

21.63

0.00

7.11

2.87

9.80

.17

2.67

8.49

1.58

1.61

.26

.04

0,00

0.00

0.00

ATOMS

NUMBERS (100.01

17.93

0.00

6.13

1.20

4,09

.07

2.56

4.93

1,60

,96

.19

0

CH

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H-i

IL

TI

RU

AP

CC

MGO/MGOtFLO

IN FthlCS =

titlGHT NORM

(100.0)

0.00

0.00

11.76

14.40

21.Hi,

2.22

0.00

0.00

0.00

29.61

0.00

0.00

12.72

6.12

0.00

0.00

0.00

0.00

1.32

0.00

.42

NON-OX IOAT ION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

11.86

9.63

22.04

4.88

0.00

0.00

0.00

30.21

0.00

0.00

20.05

0.00

0.00

0.00

0.00

0.00

1.33

0.00

.33

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

104

17

46

28

7

0

-26

3-COMPONENT

WT.PERCENTS

F 66.3?

M 17.53

A 16.14

51.18

36.36

12.46

13.35

12.16

74.4H
1003

BASALT LAVA

L. RICC1AKDI, 1886

SI 02

TI02

AL2O3

FE2O3

FEu

MNU

MGU

CAU

NA20

K2U

P205

H2O*

H2UC02

S03

CK2O3

TOTAL

UKIGIMA L

ANALYSIS

46.67

0.00

12.64

6.13

10.07

.19

b. 64

11.48

1.64

2.31

.74

2.64

0.00

0.00

0.00

.34

0.00

0.00

0.00

100.49

^ATER-C02-FKEE

(100.0)

47.86

0.00

12.96

6.29

10.33

.19

5.78

11.77

1.68

2.37

.76

SI

Tl

AL

FE3

Ft2

MN

MS

CA

NA

K

P

H*

HC

S

0

ATOMS

HEIGHT

21.80

0.00

6.69

4.29

7.83

.15

3.40

8.20

1.22

1.92

.32

.03

0.00

0.00

0.00

44.30

ATOhS

NUMBERS (100.0

18.02

0

5

1

3

3

4

1

1

00

75

• 78

26

06

25

75

23

14

24

60.51

0

CH

OR

AR

AN

NE

LC

AC

NS

DI

woHY

OL

MT

HM

IL

TI

RU

AP

CC

MGG/MGU»FEu

IN FEI-ilCS =

WEIGHT NORM

(100.0)

0.00

0.00

14.03

14.26

20.79

0.00

0.00

0.00

0.00

27.51

0.00

6.09

6.54

9.13

0.00

0.00

0.00

0.00

1.66

0.00

.57

NON-OXIDATION NORM

(HE203 CONVERTED TO FEO)

0.00

0.00

14.20

10.65

21.04

2.05

0.00

0.00

0.00

28.51

0.00

0.00

21.88

0.00

0.00

0.00

0.00

0.00

1.68

0.00

.40

NIGGLI

SI

AL

F«

C

ALK

K

MG

TI

P

C/FM

02

105

16.

48.

2 7.

6.

0.

-23

3-COMPONENT

WT.PERCENTS

F 62.82

M ?1.87

A 15.32

F 51.22

10.6

14.q

74.4

NO. 1003

REMARKS: Loss on heating 2.64%.

MINERALOGY: See 1002.

No. 1004

REMARKS: MnO and MgO traces; loss on heating 1.50%.

MINERALOGY: Phenocrysts: Rare corroded feldspar.

Groundmass: Pale yellow-green aegirine, abundant

nepheline, some feldspar and epidote. Flow texture

sometimes developed.

OTHER INFORMATION: Specific gravity 2. 64.

No. 1005

REMARKS: TiO2 trace; loss on heating 0.83%.

MINERALOGY: Phenocrysts: Anorthoclase. Groundmass: Flow-banded anorthoclase and aegirine.

OTHER INFORMATION: The Axum stellae were carved

from this rock-type.
1004

TINGUAITE

14.0814 38.43E,

G.T. PRIOR, 1900

tDOA t>HECRGHIS, AXUM, TlGRAy

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MfiO

CAO

NA20

K20

P2U5

H2U+

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

57.81

0.00

18.74

5.76

.42

0.00

0,00

1.28

9.35

4.52

0.00

1.50

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.38

V.ATER-C02-FREE

(100.0)

59.06

0.00

19.15

5.88

.43

0.00

0.00

1.31

9.55

4.62

0.00

SI

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

27.01

0.00

9.92

4.03

.33

0.00

0.00

.91

6.94

3.75

0.00

.02

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

20.72

0

7

1

0

0

6

2

0

00

92

56

13

00

00

49

50

07

00

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

R'J

AP

cc

MGO/MGO+ftO

IN FEMCS =

WEIGHT NORM

(100.0)

0.00

0.00

27.36

42.38

0.00

16.44

0.00

7.30

0.00

0.00

2.72

0.00

0.00

1.39

2.42

0.00

0.00

0.00

0.00

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

27.67

42.79

0.00

16.67

0.00

0.00

1.95

5.87

0.00

0.00

5.06

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

199

38.0

16.1

4.7

41.2

.2

0.0

0.0

0.0

.2

-57

3-COMPONENT

WT.PERCENTS

F 30.8?

M 0,00

A 69.IB

F 28.97

61.7?

29.84

1005

SOLVSbERGITL

14.0BN 3B.43E,

G.T. PRIOR, 1900

EDDA GhEORGhJS. AXJK, TIGRAY

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

SO3

TOTAL

ANALYSIS

63.74

0.00

17.P6

4.27

.30

.19

.10

.83

7.23

5.19

0.00

.63

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.54

WATER-C02-FREE

(100.0)

63.93

0.00

17.91

4.28

.30

.19

.10

.83

7.25

5.21

0.00

Si

TI

AL

FE3

Ffc2

MM

MG

CA

NA

<

P

H*

HC

S

ATOMS

WEIGHT

29.78

0.00

9.45

2.99

.23

.15

.06

.59

5.36

4.31

0,00

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

22.29

0.00

7.36

1.13

.09

.06

.05

.31

4.90

2.32

0.00

Q

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMCS =

WEIGHT NORM

(100.0)

.39

o.no 30.84

61.50

.85

0.00

0.00

0.00

0.00

.54

1.08

0.00

0.00

1.60

3.19

0.00

0.00

0.00

0.00

0.00

1.00

NON.OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

31.10

58.60

.86

1.85

0.00

0.00

0.00

2.94

0.00

0.00

4.66

0.00

0.00

0,00

0.00

o.oo

0.00

0.00

.04

AL

FM

C

ALK

K

MG

TI

p

C/FM

OZ

249

41.2

14.8

3.5

40.5

.04

0.0

0.00

.24

-13

3-COMPONENT

WT.PERCENTS

F 26.74

M ,59

A 72.67

F 25.65

C 4.66

A 69.70

N 54.57

K 39.17

C 6.26
1006

GRORUDlTIC ObSlDlAN

14.16N 38.59E. BASE. OF

G.T. PRIOk, 1900

BERRACHt N.E. OF AbUA, TIGRAY

SI02

TIO2

AL2O3

FF2O3

FEU

MNO

MGO

CAO

NA2O

K2O

P2O5

HZU*

H2OCO2

SO3

TOTAL

0

CB

OR

A3

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HH

IL

TI

RU

Ac1

CC

IN FEHICS -

ORIGINA|

ANALYSIS

67.03

O.OO

14.25

1.96

1.70

0.00

0.00

1.05

3.85

3.90

0.00

5.73

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.47

ktlGHT NORM

(100.0)

2B.40

1.88

24.66

34.fc4

5.57

0.00

0.00

0.00

0.00

0.00

0.00

1.61

0.00

3.04

0.00

0.00

0.00

0.00

0.00

0.00

0.00

HATER-C02-FREE

(100.0)

71.51

0.00

15.20

2.09

1.81

0.00

0.00

1.12

4.11

4.16

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

26.30

1.89

24.76

34.98

5.59

0.00

0.00

0.00

0.00

0.00

0.00

6.4B

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

SI

TI

AL

F£3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

31.32

0.00

7.54

1.37

1.32

0.00

0.00

.75

2.86

3.24

0.00

.07

0.00

0.00

0.00

51.01

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

UZ

ATOMS

NUMBERS

24.76

0.00

6.20

.55

.53

0.00

0.00

.42

2.76

1.R4

0.00

62.96

359

45.0

15.6

6.0

33.4

.40

0.00

0.0

0.00

.39

125

(100.0)

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

O.I.

32.OR

0.00

67.92

29.37

A. 43

62.20

43.75

44.32

11.93

100.00

No. 1006

REMARKS: MnO and MgO traces; loss on heating 5.73%.

MINERALOGY: Phenocrysts: Scarce feldspar and augite.

Groundmass: Pale-brown perlitic glass with feldspar

microlites.

OTHER INFORMATION: Specific gravity 2. 376.

No. 1007

REMARKS: No separate determination of FeO; MnO and

MgO traces; loss on heating 0.44%.

MINERALOGY: Phenocrysts: Rare anorthoclase.

Groundmass: Feldspar, aegirine, quartz, iron-oxides;

no flow-texture.

OTHER INFORMATION: Specific gravity 2.58.

No. 1008

REMARKS: No separate determination of FeO; MnO and

MgO traces; loss on heating 0. 28%.

MINERALOGY: Phenocrysts: Small corroded anorthoclase, quartz, riebeckite phenocrysts die out close to

contact with phyllites. Groundmass: Anorthoclase,

riebeckite, rare aegirine.

OTHER INFORMATION: Specific gravity 2.58. Prior

also gives a partial analysis of a paisanite from Amba

Semajata (14. UN 38. 58E), east of Adua:

SiO2 68.96 MnO tr.

A12O 15.17 MgO tr.

Fe2O 3.10 CaO 0.71

alkalis (by difference from 100.00) 12.06

This rock has a microgranitic appearance, and is composed of anorthoclase, rare quartz and iron-oxide after

aegirine(?).
14.17N 3B.58E,

C.T. PRIOR, 1900

AM[A SIpAT, N.t. OF ADUA, TlGRAy

SI02

T102

A|_203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H2CIC02

S03

TOTAL

OHI&IMA

ANALySI

73.46

0.00

12.47

3.64

0.00

0.00

0.00

.32

5.63

4.03

0.00

.44

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.99

WATER-C02-FKEE

(100.0)

73.79

0.00

12.53

3.66

0.00

0.00

0.00

.32

5.66

4.05

0.00

51

TI

*L

Ft3

Ffc2

MN

H6

CA

NA

<

P

H*

HC

s

ATOMS

HEIGHT

34.32

0.00

6.60

2.55

0.00

0.00

0.00

.23

4.18

3.35

0.00

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.42

0.00

5.09

.95

0.00

0.00

0.00

.12

3.7B

1.7B

0.00

0

en

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO*FEO

IN FEMICS =

WfclGHT NORM

(100.0)

26.28

0.00

23.99

41.87

0.00

0.00

0.00

5.39

0.00

0.00

.67

0.00

0.00

0.00

1.80

0.00

0.00

0,00

o.oo

o.oo

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

26.08

0.00

24.16

42.16

0.00

0.00

0.00

0.00

1.43

1.44

0.00

4.73

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

397

39. 8

14.9

1.9

43.5

.32

0.00

0.0

0.00

.13

134

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

27.37

0.00

72.63

76.73

2.35

70.93

56.41

40.38

3.21

1008

PAISANITE

14.ION 36.55E.

G.T. PRIOR, 1900

AM&A SHELLCDA, ADUA, TIGRA Y

SI02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

76.01

0,00

11.96

2,06

0.00

0.00

0.00

.26

4.46

4.73

0.00

.28

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.76

WATER-C02-FREE

76.41

0.00

12.02

2.07

0.00

0.00

0.00

.26

4.48

4.75

0.00

(100.0)

SI

TI

AL

F£3

FE2

MN

MS

CA

NA

K

P

H*

Hc

s

ATOMS

WEIGHT

35.51

0.00

6.33

1.44

0.00

0.00

0.00

.19

3.31

3.93

0.00

.00

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

26.21

0.00

4.86

.54

0.00

0.00

0.00

.10

2.98

2.08

0.00

0

CB

OR

AH

AN

NE

LC

AC

N5

DI

WO

HY

OL

MT

m

IL

TI

RU

AD

CC

IN FEMICS r

WEIGHT NOKM

(100.0)

32.31

0.00

28.18

35.33

0.00

0.00

0.00

2.39

0.00

0.00

.54

0.00

0.00

0.00

1.25

0.00

0.00

o.oo 0.00

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

31.96

0.00

28.29

35.47

0.00

0.00

0.00

0.00

.63

1.16

0.00

2.48

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

=M

c

ALK

K

MG

TI

P

C/FM

OZ

9.

1.

45.

0.

0.

0.

192

3-COMPONFNT

WT.PERCENTS

F 18.31

17.90

2.26

79.84

47.20

50.05

2.75
1009

OLIVIH E BASALT (K'ECEIT)

. AFAR AND 1S5A

A. DF- GENNES AND A. F,0NAK0, 1900

SIO2

TIO2

AL203

FE203

FEO

MNU

M 3 0

CAO

NA20

K2U

P2GS

H20+

H20-

C 0 2

S 0 3

TOTAL

ORIdNAi

ANALYSIS

48.75

0.00

1B.70

15.46

0.00

0.00

5.32

9.25

2.77

• 72

0.00

. 8 7

0.00

0.00

0.00

0.00

0.00

0.00

0.00

loi.e ^

wATER-cOz-FfiEE

(loo.o)

48.28

0.00

18.52

15.31

0,00

0.00

5.27

9.16

2.74

.71

0.00

SI

TI

AL

FE3

FL2

HN

MG

CA

NA

K

P

H t

HC

s

0

ATOMS

«EIGHT

22.78

0.00

9.69

10.81

0.00

0.00

3.21

6.61

2.06

. 6 0

0.00

. 0 1

0.00

0.00

0.00

45.87

ATOMS

NUMBERS (100.0 )

17.68

0.00

7.99

4.23

0.00

0.00

2.R8

3.60

1.95

. 3 3

0.00

61.35

0.00

4.22

23.26

36.08

0.00

0.00

0.00

0.00

7.37

0L

MT

HM

IL

T I

RU

AP

CC

MGO/MGG^EU

IN FEf-iICS =

0.00

0.00

15.34

0.00

0.00

0.00

0.00

0.00

1.00

NON-OXIDATION NORM

(hE2O3 CONVFrtTED TO FEO)

0.00

0.00

4.35

23.96

37.17

0.00

0.00

0.00

0.00

8.22

0.00

6.95

19.36

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.43

111

25.

22.7

7.2

0.0

0.00

3-COMPONENT

WT.PERCENTS

F 63.70

M 21.92

A 14.38

F 54.62

C 32.80

A 12.3R

No. 1009

REMARKS: No separate determination of FeO; loss on

heating 0. 87%.

MINERALOGY: None given.

No. 1010

REMARKS: No separate determination of FeO; loss on

heating 0. 75%.

MINERALOGY: None given.

No. 1011

REMARKS: No separate determination of FeO; loss on

heating 1.38%; published summation is 100.87.

MINERALOGY: Spherulitic vitric rhyolite with arfvedsonite

and riebeckite.
1010

0L1VINE BASALT (RECENT)

• AFAk AMD ISSA

A. DE GENNES AND A. BONARD. 1900

SI02

TI02

AL2O3

FE2O3

FED

MNO

MGO

CAO

NA20

K2U

P205

H2O+

H20-

C02

S03

TOTAL

ORlGlNAl

ANALYSIS

50.20

0,00

IB.70

14.66

0.00

0.00

b.37

8.55

2.98

.86

0.00

.75

0.00

0.00

0.00

0.00

0.00

0.00

0.00

102.07

WATER-C02-FREE

(100.0)

49.55

0.00

18.46

14.47

0.00

0.00

5.30

8.44

2.94

.85

0.00

SI

TI

AL

Ft3

F£2

MM

MG

CA

NA

K

P

Ht

HC

5

ATOMS

HEIGHT

23.45

0.00

9.89

10.25

0.00

0.00

3.24

6.11

2.21

.71

0.00

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

18.05

0.00

7.92

3.97

0.00

0.00

2.88

3.29

2.08

.39

0.00

0

CR

OR

A3

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGOtFEO

IIM FEt'.ICS =

WEIGHT NOKM

(100.0)

4.63

0.00

5.03

24.94

34.62

0.00

0.00

0.00

0.00

5.71

0.00

10. 5B

0.00

0.00

14,50

0.00

0.00

0.00

0.00

0,00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

5.17

25.64

35.60

0.00

0.00

0.00

0.00

6.35

0.00

11.65

15.59

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.45

117

25

3-COMPONFNT

wT.PERCENTS

F 61.4?

M 22.50

A 16.09

F 54.20

C 31.61

A 14.20

1011

HYALORHYOLITt

, AFAR Af,D ISSA

A. DE GENNES AND A. BONARD, 1900

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2U5

H20*

H20-

C02

S03

TOTAL

OKIcIMA,

ANALYSIS

73.10

0.00

12.20

3.91

0.00

0.00

1.54

1.51

2.R9

4.40

0.00

1.38

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.93

WATER-C02-FREE

(100.0)

73.43

0.00

12.26

3.93

0.00

0.00

1.55

1.52

2.90

4.42

0.00

SI

TI

AL

FE3

FE2

MN

Mb

CA

NA

<

P

H*

HC

S

ATOMS

WEIGHT

34.15

0.00

6.46

2.73

0.00

0.00

.93

1.08

2.14

3.65

0.00

.02

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.42

0.00

5.00

1.03

0.00

0.00

.HO

.56

1.95

1.95

0.00

0

CH

OR

Afl

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H<4

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

WEIGHT NORM

(100.0)

33.97

0.00

26.20

24.63

7.30

0.00

0.00

0.00

0.00

.19

0.00

3.77

0.00

0.00

3.94

0.00

0.00

0.00

0.00

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

31.54

0.00

26.39

24.82

7.36

0.00

0.00

0.00

0.00

.21

0.00

9.69

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.46

c

ALK

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F 30.69

M 12.09

A 57.22

F 30.76

C 11.88

A 57.36

N 32.84

K 50.00

C 17.16
1012

HYAL0RHY0LITE

. AFAR AND ISSA

A. DP GENNES AND A. bONARO, 1900

SI02

TI02

AL203

FE203

FEO

MNO

M6U

CAO

NA20

K20

P2O5

H20*

H20-

C02

50J

TOTAL

ORI&INAi

ANALYSIS

76.60

0.00

10.40

5.65

0.00

0.00

1.52

.51

l.PO

4.10

0.00

1.20

0.00

0.00

0.00

0.00

0.00

0.00

0.00

101.78

WATER-C02-FKEE

(100.0)

76.16

0.00

10.34

5.62

0.00

0.00

1.51

.51

1.79

4.0e

0.00

SI

TI

AL

FE3

Ft2

MN

M&

CA

NA

K

P

H*

HC

S

0

ATOMS

-EIGHT

35.79

0.00

5.50

3.95

0.00

0.00

.92

.36

1.34

3.40

0.00

.01

0.00

0.00

0.00

50.50

ATOMS

NUMBERS (100.0)

26.41

0.00

4.23

1.47

0.00

0.00

.78

.19

1.20

1.80

0.00

63.92

0

C3

OR

AR

AN

NE

LC

AC

N5

01

wo

HY

OL

MT

HM

IL

TI

RU

AC

CC

Wtl&HT NORM

(100.0)

46.68

2.05

24.16

15.18

2.52

0.00

0.00

0.00

0.00

0.00

0.00

3.77

0.00

0.00

5.63

0.00

0.00

n.oo 0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

43.33

2.07

24.42

15.35

2.55

0.00

0.00

0.00

0.00

0.00

0.00

12.28

0.00

0.00

0.00

0.00

o.oo 0.00

0.00

0.00

NIGGLI

SI

AL

FM

C

ALK

,K

MG

TI

P

C/FM

OZ

435

34.

37.

3.

24.

0.

0.

236

FtMCS = 1.00

3-COMPONENT

wT.PERCENTS

F 43.23

M 11.63

A 45.14

F 46.85

C 4.23

A 48.92

N 28.08

K 63.96

No. 1012

REMARKS: No separate determination of FeO; loss on

heating 1. 20%.

MINERALOGY: Same as 1011.

No. 1013

REMARKS: No separate determination of FeO; loss on

heating 2. 50%.

MINERALOGY: None given.

No. 1014

REMARKS: In the two source references given it is

evident that some oxide values have been transposed;

these have been corrected for, following El-Hinnawi

(1964).

MINERALOGY: None given.
1013

RHYOLITE

, AFAR ANL 1SSA

A. OE GENNES AND A. CONAPD, 1900

SI02

TI02

AL203

FE2O3

FEU

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

503

TOTAL

ORlGlNAi

ANALYSIS

76.80

0.00

11.80

.B5

0.00

0.00

1.28

.43

.40

5.90

0.00

2.50

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.96

WATER-C02-FKEE

78.80

0.00

12.11

.87

0.00

0.00

1.31

.44

.41

6.05

0.00

(100.0)

SI

TI

AL

FE3

FE2

MN

Mi

CA

NA

K

P

H+

HC

S

ATOMS

WEIGHT

35.88

0.00

6.24

.59

0.00

0.00

.77

.31

.30

4.90

0.00

.03

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

27.02

0.00

4.89

.23

0.00

0.00

.67

.16

.27

2.65

0.00

0

en

OR

AB

AN

NE

LC

AC

NS

D!

WO

HY

OL

MT

HM

IL

TI

RU

AB

CC

MGO/MG0*FEO

IN FEMCS =

WEIGHT NORM

(100.0)

50. ZZ

4.06

3S.89

3.48

2.20

0.00

0.00

0.00

0.00

0.00

0.00

3.28

0.00

0.00

.87

0.00

0.00

0.00

0.00

0.00

1.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

49.71

4.07

35.95

3.49

2.20

0.00

0.00

0,00

0.00

0.00

0.00

4,59

0.00

0,00

0.00

0.00

0,00

0.00

0.00

0.00

.77

FM

C

ALK

K

MG

TI

P

C/FM

OZ

18.1

3.3

29.4

.91

.75

0.0

0.00

.18

325

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

10.08

15.IB

74.73

11.21

5.67

R3.U

1014

ANKARAMITt

, BETWEEN Jlf-uTI AND DAHITA, AFAR AND ISSA

RAOULT (IN KREHKEL. 1925 AND ffOHLEDER AND HITCHEN, 1930)

SI02

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

44.24

2.18

8.61

5.57

7.62

0.00

14.68

13.03

1.84

.47

.17

1.98

0.00

0.00

.04

0.00

0.00

0.00

0.00

100.43

WATER-C02-FREE

(100.0)

44.95

2.22

8.75

5.66

7.74

0.00

14.92

13.24

1.87

.48

.17

SI

TI

AL

FE3

Ft2

MN

MG

CA

NA

K

P

H*

Hc

s

ATOMS

WEIGHT

20.67

1.31

4.56

3.90

5.92

0.00

8.85

9.31

1.37

.39

.07

.02

0.00

0.00

.02

ATOMS

NUMBERS (100.01

16.70

.62

3.83

1.58

2.41

0.00

8.27

5.27

1.35

.23

.05

0

C3

OR

An

AN

NE

LC

AC

NS

DI

woHY

OL

MT

HM

IL

TI

RU

AO

CC

MGO/MGO+FLO

IN FEMCS =

WEIGHT NORM

(100.0)

0.00

0.00

2.83

9.68

14.04

3.34

0.00

0.00

0.00

40.13

0.00

0.00

17.18

8.22

0.00

4.20

0.00

0.00

.3H

0.00

.89

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

2.86

3.19

14.20

6.95

0.00

0.00

0.00

41.57

0.00

0.00

26.61

0.00

0.00

4.25

0.00

0.00

.38

0.00

.72

FM

C

ALK

60.6

26.1

3.9

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 43.70

M 4S.64

A 7.65

F 46.23

C 45.67

A 8.10

N 11.99

K 3.06

C 84.94
1015

P0RPHYRIT1C -SASALT

, faETWEEN . uilfcT KhARAB AND OBOCK (AFAR AND IS5A)

RAOULT (IN I<.RENK.E:L. 1925 AND ROHLEDER AND HITCHEN, 1930)

5IU2

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CftO

NA20

K20

P205

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

46.09

2.00

17.71

3.31

6.36

0.00

4.75

13.62

2.52

.90

.36

.26

0.00

0.00

.05

0.00

o.oo 0.00

o.oo

100.13

»,ATER-CO2-FKtE

(100.0)

48.IB

2.00

17.74

3.32

6.37

0.00

4.76

13.84

2.52

.90

.36

SI

TI

AL

FE3

FE2

MN

Mb

CA

NA

K

P

H*

HC

S

0

ATOMS

WEIGHT

22.47

1.20

9.37

2.32

4.94

0.00

2.87

9.88

1.87

.75

.16

.00

0.00

0,00

.02

44.30

ATOMS

NUMBERS (100.0)

17.68

7

1

0

2

5

1

55

67

92

96

oo61

45

HO

42

11

60.83

0

CH

OR

An

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

1L

TI

RU

AP

cc

MGU/MGO+FEO

IN FEMICS =

WtlGHT NORM

(100.0)

0.00

0.00

5.34

20.91

34.38

.27

0.00

0.00

0.00

26.14

0.00

0.00

3.55

4.8?

0.00

3.00

0.00

0.00

.79

0.00

.73

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

5.37

17.20

34.60

2.35

0.00

0.00

0.00

27.02

0.00

0.00

8.B3

0.00

0.00

3.83

0.00

0.00

.79

0.00

.54

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

02

HI

24.

34.

34.

7.

3.

-17

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

c

54.20

26.63

19.17

35.93

51.36

12.71

14.62

5.22

80.16

No. 1015

REMARKS: See under 1014. El-Hinnawi (1964) quotes

the SO3 value as Cl.

MINERALOGY: None given.

No. 1016

REMARKS: MnO trace; loss on heating 1.05%.

MINERALOGY: Phenocrysts: Large alkali feldspar,

minor plagioclase. Groundmass: Feldspar, riebeckite,

quartz, calcite.

OTHER INFORMATION: This is most probably, but not

certainly, a PreCambrian Basement rock.

No. 1017

REMARKS: The analyses of Arsandaux (1903a, b) are

only quoted to one decimal place; loss on heating is given

under H_O+.

MINERALOGY: Phenocrysts: Anorthoclase crystals with

'secondary' albite penetrations. Groundmass:

Anorthoclase, aegirine, riebeckite, quartz.
1016

*DAHAMITE * (RIEBECK.ITE C0MEND1TE) nBASEMENT"

, SOCOTHA ISLAND, INDIAN OCEAN

A. PELIK.AN. 1902

SI02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P205

H20 +

H20-

C02

S03

TOTAL

OK I GINAL

ANALYSIS

74.02

0.00

13.56

1.93

1.09

0.00

.23

.56

5.R0

2.06

0.00

1.05

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.30

WATER-C02-FREE

74.58

0.00

13.66

1.94

1.10

0.00

.23

.56

5.84

2.08

0.00

(100.0)

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

34.58

0.00

7.17

1.35

.85

0.00

.14

.40

4.30

1.71

0.00

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.49

0.00

5.50

.50

.31

0.00

.12

.21

3.87

.91

0.00

0

ca

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H

1*!

IL

TI

RU

AP

CC

MdO/MGCUKEO

IN FEhlCb =

*ElGHT NORM

(100.0)

30.74

.75

12.30

49.58

2.R1

0.00

0.00

0.00

0.00

0.00

0.00

.99

0.00

2.83

0.00

0.00

0.00

0.00

0.00

0.00

.65

NON-OXIDATION NORM

(FE20J CONVERTED TO FEO)

28.79

.75

12.35

49.77

2.82

0.00

0.00

0.00

0.00

0.00

0.00

5.52

0.00

0.00

0.00

o.oo

0.00

0.00

0.00

0.00

.13

0.00

.22

153

3-COMPONENT

WT.PERCENTS

F 27.lfl

M 2.07

A 70.75

F 26.40

68.88

24.47

6.65

09.27N 41.53E. KARSA, HARAkrE

H. ARSANDAIJX. 1903A

SI02

TIU2

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K2U

P2U5

H20*

H20-

C02

S03

OR 101 MAI

ANALYSIS

66.50

0.00

18.90

3.60

1.30

0.00

.40

.20

4.80

4.50

0.00

.90

0.00

0.00

0.00

WATER-C02-FREE

(100.0)

66.37

0.00

18.86

3.59

1.30

0.00

.40

.20

4.79

4.49

0.00

SI

TI

AL

FE3

Ft2

MN

MG

CA

NA

K

P

H+

HC

s

ATOMS

WEIGHT

31.07

0.00

10.00

2.52

1.01

0.00

.24

.14

3.56

3.74

0.00

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

23.04

0.00

7.72

.94

.38

0.00

.21

.07

3.23

1.99

0.00

Q

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

M6O/MG0+FE0

IN FEMICS =

WEIGHT NOKM

(100.0)

20.12

5.73

26.61

40.64

.99

0.00

0.00

0.00

0.00

0.00

0.00

1.00

0.00

4.19

.71

o.oo

0.00

0.00

o.oo

0.00

1.00

NON-OXIDATION NORM

(FE203 CONvEkTED TO FEO)

16.71

5.77

26.80

40.92

1.00

0.00

0.00

0.00

0.00

0.00

0.00

8.80

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.14

285

47.8

MG

TI

P

C/FM

QZ

.14

0.0

0.00

.05

56

3-COMPONENT

«|T.PERCENTS

F 33.56

50.53

47.37
1018

PANTELLEFUTE

09.0HU 39.52E, TADECrtA

H. ARSANDAUX. 1903A

SIu2

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

<2O

P2O5

H2O*

H2UCO2

SO3

TOTAL

ANALYSI

68.50

0.00

12.10

6.20

2.20

0.00

.10

.60

6.10

4.50

0.00

.20

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.«>0

«ATER-C02-FRtE

(100.0)

68.30

0.00

12.06

6.18

2.19

0.00

.10

.60

6.08

4.49

0.00

SI

TI

AL

FE3

FE2

MN

Mi

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

32.00

0.00

6.40

4.34

1.71

0.00

.06

.43

4.53

3.74

0.00

.00

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

24.06

0.00

5.01

1.64

.65

0.00

.05

.23

4.16

2.02

0.00

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

cc

IK&I6HT NORM

(100.0)

16.93

0.00

26.58

37.03

0.00

0.00

0.00

12.83

0.00

2.62

o.oo 1.46

0.00

2.56

0.00

0.00

0.00

o.oo 0.00

U.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

17.27

0.00

26.90

37.47

0.00

0.00

0.00

0.00

3.43

2.68

0.00

12.24

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

294

30.7

28.7

2.H

37.9

.33

.02

0.0

0.00

.10

64

3-COhPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

43.9R

.52

55.50

42. 86

3.06

54. OH

54.46

40.18

5.36

No. 1018

REMARKS: See under 1017.

MINERALOGY: None given.

No. 1019

REMARKS: See under 1017. Loss-on-heating trace .

MINERALOGY: None given.

No. 1020

REMARKS: See under 1017.

MINERALOGY: None given.
1019

PANTELLtRlTIC OHSIwlAN

09.00N 39.55E. FANTALIi

H. AR5ANDAUX* 1903A

S102

TI02

AU2O3

FE2O3

FEO

MNO

MGU

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

69.10

0.00

10.50

3.60

6.40

0.00

.10

.40

6.20

4.30

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.60

WATER-C02-FritE

68.69

0,00

10.44

3.58

6.36

0.00

.10

.40

6.16

4.27

0.00

(100.0)

SI

Tl

AL

FE3

FE2

MN

MS

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

32.28

0.00

5.56

2.52

4.97

0.00

.06

.29

4.60

3.57

0.00

0.00

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

24.38

0.00

4.37

.96

1.89

0.00

.05

.15

4.24

1.94

0.00

0

CB

OR

AO

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

14 FEM1CS =

WEIGHT NOPM

(100.0)

19.18

0.00

25.33

29.85

0.00

0.00

0.00

10.38

2.48

1.76

0.00

11.02

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.03

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

20.95

0.00

25.50

30.05

0.00

0.00

0.00

0.00

5.26

1.77

0.00

16.47

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.02

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

292

26.2

34. 8

l.B

37.1

.31

.02

0.0

0.00

.05

76

3-C0MP0NENT

WT.PERCENTS

F 48.54

56.88

39.45

1020

PANTELLERITE

09.18N 40.5lEi MULU.

H. ARSANDAUX, 1903A

E. OF K.IES50. HARA&GE

SI02

TI02

AL2O3

FE2O3

FEO

mo

MGO

CAU

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

71.40

0.00

11.80

5.60

1.40

0.00

.60

.20

4.20

4.30

0.00

1.40

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.90

WATER-C02-FREE

(100.0)

71.76

0.00

11.86 n

5.63 FE3

1.41 "E2

0.00 MN

.60 Mb

.20 CA

4.22 NA

4.32 »

0.00 f

<u4_

ATOMS

WEIGHT

33.36

0.00

6.24

3.92

1.09

0.00

.36

.14

3.12

3.57

0.00

.02

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.07

0.00

4.88

1.46

.41

0.00

.31

.08

2.86

1.93

0.00

0

a

OR

AS

AN

NE

LC

AC

NS

Dl

wo

HY

OL

MT

HM

IL

TI

RU

AP

CC

MG0/MG0*F£O

Hi FtKICS =

WEIGHT NORM

(100.0)

29.26

0.00

25.61

35.81

.58

0.00

0.00

0.00

0.00

• 33

0.00

1.35

0.00

4.55

2.51

0.00

0.00

0.00

0.00

0.00

I.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

24.53

0.00

25.89

36.20

.59

0.00

0.00

0.00

0.00

.37

0,00

12.43

0,00

0,00

0.00

0.00

0,00

0.00

0.00

0.00

.15

SI

AL

FM

C

ALK

K.

MG

TI

P

C/FM

OZ

351

34.3

31.0

1.1

33.7

.40

.14

0.0

0.00

.03

117

3-COMPONENT

WT.PERCENTS

F 43.4R

M 3.73

A 52.80

F 44.59

C 1.27

A 54.14

N 48.?B

K 49.43

C 2.30
1021

PANTELLERlTIC O'jSl,;lAN

08.55,< 39.23E, bALCHU

H. ARSANDAUX. 1903A

SIO2

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K2O

P205

H2O*

H2OC02

S03

TOTAL

OR IGI MAI.

ANALYSIS

71.70

0.00

K.JO

1.60

1.60

0.00

.40

0.00

3.80

4.60

0.00

2.20

0.00

0.00

0.00

0.00

o.oo

0.00

0.00

100.10

WATER-C02-FKEE

(100.0)

7 3. 2<,

0.00

14.50

1.63

1.63

0.00

.41

0.00

3.88

4.70

0.00

SI

Tl

AL

FE3

FE2

MN

Mb

CA

NA

K

P

H*

HC

S

0

ATOMS

HEIGHT

33.50

0.00

7.51

1.12

1.24

0.00

.24

0.00

2.82

3.82

0.00

.03

0,00

0.00

0.00

49.82

ATOMS

NUMBERS (100.0)

25.25

0.00

5.89

.42

.47

0.00

.21

0.00

2.60

2.07

0.00

63.08

0

CB

OR

A8

AN

NF

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO-fFEO

IN FErUCS =

WEIGHT HORM

(100.0)

31.16

3.01

27.85

32.93

0.00

0.00

0.00

0.00

0.00

0.00

0.00

2.68

0.00

2.38

0.00

0.00

0.00

0.00

o.oo

0.00

.45

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

29.52

3.02

27.94

33.0*

0.00

0.00

0.00

0.00

0.00

0.00

0.00

6.49

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.20

N1GGLI

SI

AL

FM

C

ALK

<

MG

TI

P

C/FM

QZ

395

46. 1

17.3

0.0

36.6

.44

.19

0.0

0.00

0.00

148

3-COMPONENT

WT.PERCENTS

F 26.67

45.24

54.76

0.00

No. 1021

REMARKS: See under 1017.

MINERALOGY: None given.

No. 1022

REMARKS: See under 1017.

MINERALOGY: None given.

No. 1023

REMARKS: See under 1017.

MINERALOGY: None given.
1022

PANTELLERITE

0B.58N 39.08E, CHAFFADENZA,

H. ARSANDAUX» 1903A

SI02

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H2Ot

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

72.90

0.00

12.40

3.00

2.40

0.00

.50

.10

4.40

4.30

0.00

.40

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.40

wATER-COZ-FKEE

(100.0)

72.90

0.00

12.40

3.00

2.40

0.00

.50

.10

4.40

4.30

0.00

SI

TI

AL

FE3

FE2

HN

HG

CA

NA

K

P

H+

HC

S

ATOMS

WEIGHT

34.06

0.00

6.56

2.10

1.87

0.00

.30

.07

3.26

3.57

0.00

.00

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.32

0.00

5.08

.79

.70

0.00

.26

.04

2.97

1.91

0.00

0

CB

OR

AB

AN

NF

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO-HEO

IN FEMICS =

WEIGHT NORM

(100.0)

2S.85

.30

25.48

37.33

.50

0.00

0.00

0.00

0.00

0.00

0.00

3.18

o.oo

4.36

0.00

0.00

0.00

0.00

0.00

0.00

• 4t

NON-OXlDATION NORM

(KE2O3 CONVERTED TO FEO)

25.82

.30

25.63

37.55

.50

0.00

0.00

0.00

0.00

0.00

0.00

10.20

0.00

0.00

0.00

0.00

0.00

o.oo 0.00

0,00

.16

374

37.6

TI

P

C/FM

OZ

0.0

0.00

.02

130

3-COMPONENT

WT.PERCENTS

F 36.99

M 3.4?

A 59.59

F 38.03

C .70

A 61.27

N 50.00

K 48.86

C 1.14

1023

COMENuITE

11.19N 42.55E. HOL-HOLi

H. ARSANDAU,!, 1903A

,]I:UTI, AFAR AND I5SA

SI02

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K20

P205

H20+

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

75.90

0.00

11.50

3.40

.90

0.00

.10

0.00

4.00

4.40

0.00

1.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

101.20

wATEK-C02-FREE

(100.0)

75.75

o.oo 11.48

3.39

.90

0.00

.10

0.00

3.99

4.39

0.00

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

HEIGHT

35.46

0.00

6.08

2.38

.70

0.00

.06

0.00

2.97

3.65

0.00

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

26.16

0.00

4.67

.88

.26

0.00

.05

0.00

2.67

1.94

0.00

0

CB

OR

A8

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/M60+FE0

IN FEMICS =

WEIGHT NORM

(100.0)

35.42

.13

26.03

33.87

0.00

0.00

0.00

o.oo 0.00

0.00

0.00

.25

o.oo 2.90

1.40

0.00

o.oo 0.00

o.oo 0.00

1.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

32.57

.13

26.20

34.09

0.00

0.00

0.00

0.00

0.00

0.00

0.00

7.01

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.05

C/FM

OZ

0.00

189

3-COMPONENT

WT.PERCENTS

F 33.59

33.86

0.00

66.14

47.6?

52.3B

0.00
1024

COMENDITE

, HELAnALA, AFAR AND I5SA

H. ARSANDAUX. 1903A

SIO2

TI02

AL2O3

FE203

FEU

MNO

MGO

CAO

NA2O

KZO

P2O5

H2O+

H2OCO*

SO3

TOTAL

ORIGINAL

ANALYSIS

76.00

0.00

12.70

2.10

.60

0.00

0.00

. 2 0

4.00

4.20

0.00

1.10

0.00

0.00

0.00

0.00

0.00

o.oo

0.00

100.90

WATER-C02-FKEE

76.15

0.00

12.73

2.10

.60

0.00

0.00

. 2 0

4.01

4.21

0.00

(100.0)

SI

Tl

AL

Ft3

Ft2

MN

MG

CA

NA

K

P

H*

HC

S

0

ATOMS

WEIGHT

35.51

0.00

6.72

1.47

.47

0.00

0.00

.14

2.97

3.49

0.00

. 0 1

0.00

0.00

0.00

50.13

ATOMS

NUMBERS (100.0 )

26.14

0.00

5.15

.54

.17

0.00

0.00

.07

2.67

1.84

0.00

63.41

0

CB

OR

AB

AN

NF

LC

AC

NS

DI

MO

HY

OL

MT

H

:

-t

IL

TI

RJ

Ai>

cc

MGO/MCO-M '.0

IH FEMCb =

WEIGHT NOHM

(100.0)

36.15

1.19

24.94

34.01

1.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

1.94

. 7 7

0.00

0.00

0.00

0.00

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

34.35

1.19

25.05

34.14

1.00

0.00

0.00

0.00

0.00

0.00

0.00

4.26

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

C/FM

02

464

45.8

3-COMPONENT

WT.PERCENTS

F 74.77

24.32

1.80

73. 87

47.6?

•50.00

2.38

No. 1024

REMARKS: See under 1017.

MINERALOGY: None given.

No. 1025

REMARKS: See under 1017.

MINERALOGY: None given.

No. 1026

REMARKS: See under 1017. Published summation 101.6.

MINERALOGY: None given.
1025

[-OLER1TIC F'ASALT

09.13N 41.07E, HIRNA,

H. ARSANDAUX. 1903L.

SIU2

TIO2

AL2O3

FE203

FEO

MNO

MSO

CAO

NA20

K2O

P2O5

H2O*

H2OCO2

SO3

TOTAL

ORIGINAL

ANALYSIS

46.20

4.00

19.00

1.30

13.20

0.00

4.70

7.70

2.70

.70

0.00

1.50

0.00

0.00

0.00

0.00

0.00

0.00

0.00

101.00

HATER-C02-FREE

46.43

4.02

19.10

1.31

13.27

0.00

4.72

7.74

2.71

.70

0.00

(100.0)

SI

TI

AL

Ft3

FE2

MS

Mi

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

21.58

2.40

10.05

.91

10.26

0.00

2.84

5.50

2.00

.58

0.00

.02

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

17.23

1.12

8.35

.37

4.13

0.00

2.62

3.08

1.95

.33

0.00

0

CB

OR

AS

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

WEIGHT NORM

(100.0)

0.00

0.00

4.17

23.01

37.62

0.00

0.00

0.00

0.00

.55

0.00

15.47

9.45

1.90

0.00

7.63

0.00

0.00

0.00

0.00

.48

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

4.18

23.07

37.91

0.00

0.00

0.00

0.00

.56

0.00

12.97

13.67

0.00

0.00

7.65

0.00

0.00

0.00

0.00

.44

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

111

26

45

19

7

7

0

-19

9

8

9

4

15

37

2

UO

43

3-COMPONENT

WT

F

M

A

F

C

A

N

K

C

O.I.

.PERCENTS

64.16

70.80

15.04

56.64

30.08

13.28

24.32

6.31

69.37

75.57

1026

DOLERITIC BASALT

09.08M 40.02E. AWARAMALKA ,

H. ARSANDAUX« 1903B

KASSAM VALLEY* SHOA

SI02

TIU2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

503

TOTAL

ORIGINAL

ANALYSIS

46.30

l.RO

20.10

2.70

10.00

0.00

7.80

9.30

2.90

.70

0.00

.70

0.00

0.00

0.00

0.00

0.00

0.00

0.00

102.30

WATER-C02-FKEE

(100.0)

45.57

1.77

19.78

2.66

9.84

0.00

7.68

9.15

2.85

.69

0.00

SI

TI

AL

Ft3

F£2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

HEIGHT

21.63

1.08

10.63

1.89

7.77

0.00

4.70

6.65

2.15

.58

0.00

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

16.70

.49

8.55

.73

3.02

0.00

4.20

3.60

2.03

.32

0.00

0

CB

OR

AB

AN

NF.

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO*FLO

IN FEMICS =

WEIGHT NORM

(100.0)

0.00

0.00

4.08

21.10

39.10

1.68

0.00

0.00

0.00

5.23

0.00

0.00

21.58

3.86

0.00

3.36

0.00

0.00

0.00

0.00

.66

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

4.10

18.13

39.30

3.36

0.00

0.00

0.00

5.33

0.00

0.00

26.41

0.00

0.00

3.38

0.00

0.00

0.00

0.00

.57

c

ALK.

C/FM

OZ

3-COMPONENT

MT.PERCENTS

F 52.70

M 32.37

A 14.94

49.61

36.33

14.06

22. 48

5.43

72.09
1027

rOLEFUTIC BASALT

. YAffLI . jIUTI , AFAR AND ISSA

H. ARSANDAUX. 1903n

SI02

TIU2

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H2U +

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

46.60

1.40

18.80

.40

9.10

0.00

12.20

10.60

2.10

• 20

0.00

.10

0.00

0.00

o.oo 0.00

0.00

0.00

0.00

101.50

WATER"

45.96

1.38

18.54

.39

8.97

0.00

12.03

10.45

2.07

.20

0.00

CO2—F^EE

(100.0)

SI

TI

AL

FE.3

Ft2

MN

MCJ

CA

NA

K.

P

H*

HC

S

ATOMS

WEIGHT

21.77

.84

9.95

.28

7.07

0.00

7.36

7.58

1.56

.17

0.00

.00

0.00

0.00

o.oo

ATOMS

NUMBEKS (100.0)

16.63

.38

7.91

.11

2.72

0.00

6.50

4.06

1.45

.09

0.00

0

CB

OR

An

AN

NE

LC

AC

NS

DI

WO

HY

OL

NT

HM

IL

TI

RU

AP

rcMGO/NKjGtFEQ

IN FEMICS =

WEldHT NORM

(100.0)

0.00

0.00

1.17

16.88

40.69

.37

0.00

0.00

0.00

9.12

0.00

0.00

28.59

.57

0.00

2.62

0.00

0.00

0.00

0.00

.74

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

1.17

16.44

40.72

.61

0.00

0.00

0.00

9.14

0.00

0.00

29.30

0.00

0.00

2.62

0.00

0.00

0.00

0.00

.73

SI

AL

FM

C

ALK

K

MG

TI

92

21

51

22

4

2

3-COMPONENT

WT.PERCENTS

F 39.5H

M 50.83

A 9.5H

F 42.41

C 47.3?

A 10.27

N 16.2R

K 1.55

C 82.1 7

No. 1027

REMARKS: See under 1017.

MINERALOGY: None given.

No. 1028

REMARKS: See under 1017.

MINERALOGY: None given.

No. 1029

REMARKS: See under 1017. Published summation 101.0.

MINERALOGY: None given.
1028

PORPHYRITIC BASALT

08.5SN 39.23E, BALCHI,

H. ASSANDAUX. 1903B

SI 02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20+

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

47.30

3.40

17.80

4.20

11.50

0.00

4.50

7.10

2.80

1.10

0.00

1.60

0.00

0.00

0.00

0.00

0.00

0.00

0.00

101.30

WATER-C02-FREE

(100.0)

47.44

3.41

17.85

4.21

11.53

0.00

4.51

7.12

2.61

1.10

0.00

SI

TI

AL

Ft3

FE2

MM

Mb

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

22.10

2.04

9.42

2.94

8.94

0.00

2.71

5.07

2.08

.91

0.00

.02

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

17.63

.95

7.82

1.1B

3.59

0.00

2.50

2.S4

2.02

.52

0.00

Q

CB

OR

AB

AM

NF

LC

AC

NS

01

WO

HY

OL

MT

HM

IL

TI

Ru

AP

CC

MGO/MGOtFtO

IN FLKICS =

WEIGHT NORM

(100.0)

0.00

0.00

6.53

23.81

32.82

0.00

0.00

0.00

0.00

2.15

0.00

21.51

.59

6.12

0.00

6.47

0.00

0.00

0.00

0.00

.55

NON-OXIDATION NORM

(FE2O3 CONVFMTED TO FEO)

0.00

0.00

6.59

24.00

33.08

0.00

0.00

0.00

0.00

2.21

0.00

13.66

13.93

0.00

0.00

6.52

0.00

0.00

0.00

0.00

.40

3-C0MP0NENT

WT.PERCENT5

F 65.15

M IB.67

A 16.18

F 58.80

C 26.59

A 14.61

N 25.45

K 10.00

C 64.55

1029

PORPHYRITIC tjASAiT

oHISSI HILL. JIBUTI. AFAR AND ISSA

H. ARSANDAUX, 1903ti

SIU2

TI02

AL203

FE2O3

FEU

MNO

MGO

CAO

NA20

K2O

P205

H2O*

H2OCO2

SO3

TOTAL

ANALYSIS

48.70

1.70

15.70

4.50

12.50

0.00

6.00

10.10

3.30

.50

0.00

1.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

104.00

HATER-C02-FREE

(100.0)

47.28

1.65

15.24

4.37

12.14

0.00

5.83

9.81

3.20

.49

0.00

SI

TI

AL

Ft3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

22.75

1.02

8.31

3.15

9.72

0.00

3.62

7.22

2.45

.42

0.00

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

17.65

.46

6.71

1.23

3.80

0.00

3.?5

3.92

2.32

.23

0.00

0

CB

OR

A8

AN

NE

LC

AC

NS

01

wo

HY

OL

MT

HM

IL

TI

RU

AP

CC

MG0/MGO*FEO

III FEMICS =

WEIGHT NORM

(100.0)

0.00

0.00

2.87

27.16

25.74

0.00

0.00

0.00

0.00

19.10

0.00

.47

15.18

6.35

0.00

3.13

0.00

0.00

0.00

0.00

.54

NON-OX IDAT I ON NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

2.90

22.58

25.96

2.60

0.00

0.00

0.00

19.56

0.00

0.00

23.22

0.00

0.00

3.16

0.00

0.00

0.00

0.00

.42

C/FM

QZ

3-COMPONENT

WT.PfcRCENTS

F

M

A

F

C

A

63.43

22.39

14.18

55.02

32.69

12.30
1030

PORPHYRITlc ANGKTH1TE BASAL T

. GUBET <HARAp,

H. ARSANDAUX, 1903ft

AFAR AND ISSA

SIU2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAU

NA20

K20

P205

H20 +

H20-

C02

S03

TOTAL

OKIGINA L

ANALYSIS

48.90

1.40

18.90

.3 0

9.00

0.00

6.00

12.20

3.00

.3 0

0.00

.50

0.00

0.00

0.00

o.oo

o.oo

o.oo

0.00

100.SO

HATER-C02-FREE

(100.0)

48.90

1.40

18.90

.30

9.00

0.00

6.00

12.20

3.00

.30

0.00

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

0

ATOMS

WEIGHT

22.85

.84

10.00

. 2 1

7.00

0.00

3.62

8.72

2.23

.25

0.00

. 0 1

0.00

0.00

0.00

44.79

ATOMS

NUMBERS (100.0 )

17.80

.38

8.11

.08

2.74

0.00

3.26

4.76

2.12

.14

0.00

60.61

WEIGHT NOPM

0

0

1

22

37

1

(100.0)

.00

.00

.78

.97

• 19

.34

IL

TI

RU

^p

cc

M'lO/M&O+FtU

lit FEMC5 =

2.66

0.00

0.00

0.00

0.00

.58

NON-OXIDATION NORM

(FE2O3 CONVEKTE D TO FEO)

0.00

0.00

1.78

22.63

37.21

1.53

0.00

0.00

0.00

19.42

0.00

0.00

14.78

0.00

0.00

2.66

0.00

0.00

0.00

0,00

.57

C

ALK

MG

TI

C/FM

QZ

111

25.

38.

3-COMPONENT

WT.PERCENTS

F 50.00

M 32.26

A 17.74

F 37.50

C 49.19

A 13.31

N 19.35

K 1.94

C 78.71

No. 1030

REMARKS: See under 1017.

MINERALOGY: Phenocrysts: Large anorthites.

No. 1031

REMARKS: See under 1017.

MINERALOGY: None given.

No. 1032

REMARKS: See under 1017.

MINERALOGY: Phenocrysts: Labradorite.
1031

OOLERITIC BASALT

O9.OIN 40.30E, KARAKURKURA,

H. ARSANDAUX. 19031)

CHERCHER. HAKARoE

SI02

TIO2

AL2O3

FE2O3

FEO

»no

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

49.20

2.30

18.00

3.10

6.90

0.00

4.90

8.BO

2.70

.70

0.00

1.50

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.10

V.ATER-C02-FREE

(100.0)

49.90

2.33

18.26

3.14

9.03

0.00

4.97

8.92

2.74

.71

0.00

SI

TI

AL

FE3

FE2

MM

Mb

CA

NA

K

P

H+

HC

5

ATOMS

WEIGHT

22.99

1.38

).52

.17

>.92

).00

.96

>.29

.00

.58

0.00

.02

0.00

0.00

0.00

ATOMS

NUMBERS (100.0

18.26

.64

7.87

.87

2.77

0.00

2.72

3.50

1.94

.33

0.00

0

C3

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO*FEO

IN FEMICS =

WEIGHT NORM

(100.0)

1.88

0.00

4.21

23.22

35.40

0.00

0.00

0.00

0.00

7.38

0.00

18.92

0.00

4.57

0.00

4.43

0.00

0.00

0.00

0.00

.62

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

4.23

23.36

35.61

0.00

0.00

0.00

0.00

7.56

0.00

20.60

4.19

0.00

0.00

4.45

0.00

0.00

0.00

0.00

.48

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

122

26.4

42.5

23.5

7.6

.15

.43

4.3

0.00

.55

-8

3-COMPONENT

WT.PERCENTS

F 59.11

M 24.14

A 16.75

F 49.59

C 36.36

A 14.05

5.74

72.13

1032

P0RPHYRIT1C BASALT

09.44N 42.08E, jlLDESSA, HARARGE

H. ARSANDAUX. 1903b

SI02

TIU2

AL2O3

FE203

FEu

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

49.30

3.90

16.00

3.30

11.10

0.00

5.20

8.60

2.90

.60

0.00

.50

0.00

0.00

0.00

0.00

0.00

0.00

0.00

101.40

KATER-C02-FKEE

(100.0)

48.86

3.87

15.86

3.27

11.00

0.00

5.15

8.52

2.87

.59

0.00

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

HEIGHT

23.03

2.34

8.47

2.31

8.63

0.00

3.14

6.15

2.15

.50

0.00

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

18.10

1.08

6.92

.91

3.41

0.00

2.85

3.38

2.07

.28

0.00

0

CB

OR

AS

AN

NE

LC

AC

NS

DI

WO

HY

OL

fT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

WEIGHT NORM

(100.0)

1.66

0.00

3.52

24.37

28.58

0.00

0.00

0.00

0.00

11.36

0.00

18.41

0.00

4.75

0.00

7.34

0.00

0,00

0.00

0.00

.60

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

3.54

24.52

28.76

0.00

0.00

0.00

0.00

11.64

0.00

18.95

5.21

0.00

0.00

7.38

0.00

0.00

0.00

0.00

.47

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

119

22.a

47.2

22.3

7.7

.12

.40

7.1

0.00

.47

-12

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

62.34

22.51

15.15

54.34

32.45

13.21

23.97

4.96

71.07
1033

PORPHYRITIC ilASALT

09.01.N 40.30E, kAPAKURKURA, CHERCHER, HARARG E

H. ARSANDAUJH 1903b

SI02

T1U2

AL203

FE2O3

FEU

MNO

MGO

CAO

NA20

K20

P205

H20+

H20 -

C02

S03

TOTAL

OK It IN As

ANALYSIS

49.80

3.P0

17.90

2.90

11.50

0.00

4.£0

7.10

3.20

.80

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

101.60

k,ATER-C02-Ft<EE

(100.0)

49.02

3.74

17.62

2.85

11.32

0.00

4.53

6.99

3.15

.79

0.00

SI

TI

AL

FE3

FE2

MN

Mi

CA

NA

K

P

H*

HC

s

0

ATOMS

wElGHT

23.27

2.28

9.47

2.03

8.94

0.00

2.77

5.07

2.37

.66

0.00

0.00

0.00

0.00

0.00

44.73

ATOMS

NUMBERS (100.0)

18.08

1.04

7.66

.79

3.50

0.00

,2.49

2.76

2.25

.37

0.00

61.05

0

C3

0*

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HI

IL

TI

RU

AP

CC

MG0/M60+FE0

IN FEMICS =

ntlGHT HORN

(100.0)

.89

0.00

4.66

26.71

31.58

0.00

0.00

U.OO

0.00

2.63

u.oo

22.26

0.00

4.15

0.00

7.10

0.00

0.00

0.00

u.oo

.55

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

4.69

26.85

31.75

0.00

0.00

o.oo

0.00

2.68

0.00

20.64

6.25

0.00

0.00

7.14

0.00

0.00

0.00

0.00

c

ALK

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

62

20

17

56

27

15

.61

.00

.39

• 47

.84

.69

No. 1033

REMARKS: See under 1017.

MINERALOGY: Phenocrysts: Labradorite.

No. 1034

REMARKS: See under 1017.

MINERALOGY: None given.

OTHER INFORMATION: Location uncertain.

No. 1035

REMARKS: CO2 and SO_ traces. The analyses of

Manasse (1908, 1909, 1917) tend to have high summations;

loss on heating is given under I^O plus; otherwise these

analyses appear to be of good quality.

MINERALOGY: Phenocrysts: Zoned bytownite, with

margins of andesine-labradorite; rare titanaugite and

very rare iron-rich olivine. Groundmass: Labradorite,

green pyroxene, altered Fe-rich olivine, magnetite,

ilmenite, apatite and glass. Fluidal texture.
1034

BASALT

09.4RN 42.08E,

H. ARSANDAUX.

ARTO

1903B

SIO2

TIO2

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K2U

P205

H2O +

H2OCO2

SO3

TOTAL

OklGlNAi

ANALYSIS

50.10

1.30

19.60

1.80

9.50

0.00

4.90

7.10

3.10

1.20

o.oo

1.50

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.10

wATER-C02-F*EE

(100.0)

50.81

1.32

19.88

1.83

9.63

0.00

4.97

7.20

3.14

1.22

0.00

SI

TI

AL

FE3

Ft2

MN

Mt>

CA

NA

K

P

H +

HC

s

ATOMS

HEIGHT

23.41

.78

10.37

1.26

7.38

0.00

2.96

5.07

2.30

1.00

0.00

.02

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

18.44

.36

8.50

.50

2.93

0.00

2.69

2.80

2.21

.56

0.00

0

CB

OR

AR

AN

NE

LC

AC

NS

DI

WO

HY

OL

f»T

HM

IL

TI

RU

AP

CC

MGO/MGO+FLO

IN FEMCb =

WEIGHT .NORM

(100.0)

0.00

.26

7.21

26.66

35.81

0.00

0.00

0.00

0.00

0.00

0.00

20.60

4.32

2.65

0.00

2.50

0.00

0.00

0.00

0.00

.54

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

.26

7.23

26.75

35.93

0.00

0.00

0.00

0.00

0.00

0.00

17.27

10.04

0.00

0.00

2.51

0.00

0.00

0.00

0.00

.47

c

ALK

3-COMPONENT

WT.PERCENTS

F 55.12

M 23.90

A 20.98

F 49.78

C 31.28

A 18.94

N 27.19

K 10.53

C 62.28

1035

PORPHYRITIC dASALl

F. MANASSt, 1908

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

503

TOTAL

OKICIUAL

ANALYSIS

46.60

1.98

15.06

12.26

6.15

.71

2.58

9.66

3.69

.97

.44

.60

0.00

o.oo

0.00

0.00

0.00

0.00

0.00

101.10

nATLR-C02-Ft<EE

(100.0)

46.46

1.97

15.01

12.22

6.13

.71

2.57

9.63

3.88

.97

.44

SI

TI

AL

FE3

Ft2

MN

MG

CA

NA

K

P

H+

HC

S

ATOMS

WEIGHT

21.77

1.19

7.97

8.57

4.78

.55

1.56

6.90

2.89

.81

.19

.01

0.00

0.00

0.00

ATOMS

NOiRERS (100.0)

17.50

.56

6.67

3.47

1.93

.23

1.45

3.H9

2.83

• 47

.14

0

CB

OR

AH

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGC+FEO

IN FEhlCS =

WEIGHT NORM

(100.0)

2.00

0.00

5.73

32.87

20.66

0.00

0.00

0.00

0.00

13.85

2.86

0.00

0.00

16.40

.94

3.75

0.00

0.00

.96

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

5.86

22.46

21.15

6.07

0.00

0.00

0.00

21.82

0.00

0.00

17.82

0.00

0.00

3.83

0.00

0.00

.98

0.00

.23

SI

AL

FM

C

ALK

no20.9

44.4

24.4

10.3

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

71.22

9.9R

IB.80

S5.91

79.33

14.76

26.79

6.68

66.53
1036

TRACHYANDESITE

F. HAnASSt. 1908

SI02

TI02

AL2O3

FE2O3

FEO

MNU

MGU

CAO

NA2O

K20

P205

H2O+

H2OCO2

SO3

TOTAL

0

CR

OR

AO

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H-l

IL

TI

RU

AP

CC

Iti FtMC S =

OHIGINA L

ANALYSIS

59.56

• 31

13.94

5.82

2.98

.48

.61

4.72

6.05

3.01

.11

2.31

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.90

WEIGHT NORM

(100.0)

6.10

0.00

18.27

52.57

1.96

0.00

0.00

0.00

0.00

5.39

6.19

0.00

0.00

8.67

0.00

.60

0.00

0.00

.25

0.00

.66

KATER-C02-FKEE

(100.0)

61.03

.32

14.28

5.96

3.05

.49

.63

4.84

6.20

3.08

.11

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

18.48

53.18

1.98

o.oo

0.00

0.00

0.00

19.03

0.00

5.80

.67

0.00

0.00

.61

0.00

0.00

.25

0.00

.12

SI

TI

AL

FE3

FE2

MN

MG

Cft

NA

K

P

H»

HC

S

0

ATOMS

WEIGHT

27.83

.19

7.38

4.07

2.32

.37

.37

3.37

4.49

2.50

.05

.03

0.00

0.00

0.00

46.95

NIGGLI

SI

AL

FM

C

ALK

K.

MG

TI

P

C/FM

QZ

ATOMS

NUMBERS

21.81

.09

6.02

1.61

.91

.15

.33

1.85

4.30

1.41

.03

61.49

?03

28.0

28.0

17.3

26.6

.25

.11

• H

.16

.62

-3

(100.0)

3-COMPONENT

WT.

F

M

A

F

C

A

N

K

C

D.I.

.PERCENTS

47.64

3.30

49.05

38.97

20.90

40.17

43.90

71.84

34.25

93.52

No. 1036

REMARKS: See under 1035. SO trace.

MINERALOGY: Phenocrysts: Very rare oligoclase.

Groundmass: Oligoclase, sanidine, accessory diopsideaugite, acmite, magnetite, limonite.

No. 1037

REMARKS: See under 1035. CO2 trace.

MINERALOGY: Phenocrysts: Very rare oligoclase.

Groundmass: Oligoclase, sanidine ("not nepheline"),

green non-pleochroic augite-diopside; accessory glass,

magnetite, apatite, calcite, acmite(?).

No. 1038

REMARKS: See under 1035. SO- trace.

MINERALOGY: Phenocrysts: Zoned bytownite-oligoclase,

chiefly andesine-labradorite; rare augite-diopside.

Groundmass: Yellow-grey crystallite base composed of

green non-pleochroic pyroxene, glass, apatite, rare

tridymite, altered olivine, feldspar.

OTHER INFORMATION: Another specimen with SiO,

6319% contains chalcedony, tridymite, labradoritebytownite.
1037

APHYR1C TKACHYAN.jtSITE

, ADEN

E. MANASSE, 1908

SIO2

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA2O

K2O

P205

H20*

H2OCO2

SO3

TOTAL

OR1GI;.AL

ANALYSIS

60.75

.46

14.50

6.18

2.94

.55

.43

3.36

5.88

3.74

.25

1.44

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.46

WATER-C02-FKEE

(100.0)

61.34

.46

14.64

6.24

2.97

.56

.43

3.39

5.94

3.78

.25

SI

Tl

AL

FE3

Ft2

HN

M6

CA

NA

K

P

H*

HC

s

ATOMS

HEIGHT

28.38

.28

7.67

4.32

2.29

.43

.26

2.40

4.36

3.10

.11

.02

0.00

0.00

0.00

ATOMS

NUMBERS (100.0

21.91

6

1

1

4

1

.12

16

68

89

17

23

30

11

72

08

WEIGHT NORM

(XOO.O)

CO

OR

NE

LC

AC

NS

DI

WO

cc

MGO/MGOfFEO

IN FLMICS =

22.37

50.35

2.07

3.40

3.61

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

.92

0.00

22.64

50.96

2.09

0.00

0.00

0.00

0.00

11.89

0.00

10.05

0.00

0.00

0.00

.89

0.00

0.00

SI

AL

FM

C

ALK

K

M6

TI

P

C/FM

OZ

213

30.0

2B.9

12.7

28.4

.30

.OR

1.2

.37

.44

-1

3-COMPONENT

WT.PERCENTS

F 47.57

M 2.24

A 50.18

F 41.27

C 15.20

A 43.53

N 45.30

K 28.81

C 25.89

1038

AuGITt TRACHYOACITE

, ADEN

E. MANASSL, 1908

SI02

TI02

AL203

FF203

FEO

MNO

MGO

CAO

NA20

K2U

P205

H20*

H20-

C02

S03

OKIGINAL

ANALYSIS

64.76

.31

13.40

4.48

2.26

• 31

.39

2.57

5.65

4.10

0.00

1.21

0.00

0.00

o.oo

WATER-C02-FHEE

65.93

.32

13.64

4.56

2.30

.32

.40

2.62

5.75

4.17

0.00

(100.0)

SI

TI

AL

FE3

FE2

MN

M&

CA

NA

K

P

ATOMS

HEIGHT

30.26

.19

7.09

3.13

1.76

.24

• 24

1.84

4.19

3.40

0.00

ATOMS

NUMBERS (100.0)

23.26

.08

5.67

1.21

.68

.09

.21

.99

3.94

1.88

0.00

0

C3

OR

AB

AN

NE

LC

AC

NS

Dl

MO

HY

OL

MT

IL

TI

RJ

AC

CC

MGO/MGO+FEO

IN FEMICS =

WtlGHT NOUM

(100.0)

12.89

0.00

24.73

46.H9

0.00

0.00

0.00

1.67

0.00

4.02

3.40

0.00

0.00

5.79

0.00

.60

0.00

0.00

0.00

0.00

.57

NON-OX IDAT ION NORM

(FE2O3 CONVERTED TO FEO)

9.02

0.00

24.95

47.30

0.00

0.00

0.00

0.00

.44

11.55

0.00

6.13

0.00

0.00

0.00

.60

0.00

0.00

0.00

0.00

.10

SI

AL

FM

C

ALK

260

31.7

24.6

11.1

32.6

3-C0MP0NENT

WT.PERCENTS

F 39.93

35.36

1 3. 4fi

51.15

45.86

33.2R

20.86
1039

APHYR1C TkACHyTt

F. MANASSL. 1908

SI02

TIU2

AL<!03

FE2O3

FEO

MNO

* GO

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

S 0 3

TOTAL

ANALYSIS

67.44

0.00

11.59

4.48

1.35

. 3 4

. 3 7

2.08

6.68

4.24

. 1 2

. 6 2

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.31

*ATER-C02-FREE

(100.0)

68.34

0.00

11.74

4.54

1.37

. 3 4

. 3 7

2.11

6.77

4.30

. 1 2

SI

Tl

AL

F L 3

F E2

MN

MCJ

CA

NA

K

P

H*

H -

C

S

ATOMS

WEIGHT

31.51

0.00

6.13

3.13

1.05

. 2 6

.22

1.49

4.96

3.52

. 0 5

. 0 1

0.00

0.00

0.00

ATOMS

NUMBERS (100.0 )

23.96

0.00

4.85

l.?0

. 4 0

. 1 0

. 2 0

. 7 9

4.60

1.92

. 0 4

0

C«

OR

A13

AN

NE

LC

AC

N5

DI

WO

HY

OL

MT

HM

IL

T I

RU

AP

CC

MGO/MOO+FE O

IN htKICS =

fcElSHT NORM

(100.01

15.09

0.00

25.46

36.44

0.00

0.00

0.00

13.17

1.40

7.96

. 2 1

0.00

0.00

0.00

0.00

0.00

0.00

0.00

. 2 7

0.00

.2fi

NON-OXIDATION NORM

(FE2O3 cONvEkTED TO FEO)

17.29

0.00

25.68

36.76

0.00

0.00

0.00

0.00

4.92

8.66

0.00

6.41

0.00

0.00

0.00

0.00

0.00

0.00

. 2 7

0,00

. 1 1

. 9

. 7

. 5

. 0

. 2 9

. 1 0

. 0

. 2 2

. 4 2

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

D.I.

34.05

2.16

63.79

30.96

11.05

57.99

51.38

32.62

16.00

94.03

No. 1039

REMARKS: See under 1035.

MINERALOGY: Fresh, very fine-grained rock with a

trachytic texture. Groundmass: Aegirine-augite,

aegirine, alkali feldspar, katophorite and/or acmite,

cossyrite, rare tridymite; no feldspathoids.

No. 1040

REMARKS: See under 1035.

MINERALOGY: Phenocrysts: Anorthoclase, rare sanidine

and aegirine-augite. Groundmass: Dark brown glass

(n = 1.512-1.5 20); spherulites of feldspar microlites;

green pyroxene, cossyrite, rare magnetite and apatite.

OTHER INFORMATION: This rock contains schlieren,

the mineralogy of which is identical with the host. Two

specimens gave SiO~ contents of 69.42% and 71. 66%,

the latter bearing some chalcedony.

No. 1041

REMARKS: See under 1035.

MINERALOGY: Groundmass: Chloritised andesine,

titan-augite, rare barkevikite and biotite?; abundant

magnetite, leucoxene (from ilmenite); common apatite;

rare pyrite; analcime and natrolite.

OTHER INFORMATION: The analcime may be derived

from nepheline, and has the composition:

SiO2

A 1 2°

F e2°3

M gO

C aO

56.24

21.68

t r.

t r .

0.33

Na2°

K 2 O

H2O

total

n = 1.

1 3.

0.

8.

100.

4837

30

42

40

37

Dainelli and Marinelli (1912), who collected the Eritrean

specimens analysed by Manasse, state that this

teschenite was taken from a lithological lens in the

PreCambrian basement. There remains some doubt

about this; however, see Comucci (1948).
1040

P0RPHVRIT1C PANTELLEPITE (WELDED TUFF )

» ADEN

E. MANASSE , 1908

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

503

TOTAL

ORIGINAL

ANALYSIS

68.04

0.00

12.10

3.18

1.90

.20

.19

.82

5.53

4.50

0.00

3.40

0.00

0.00

0.00

0.00

o.oo

0.00

0.00

99.86

k,ATER-C02-FREE

(100.0)

70.54

0.00

12.54

3.30

1.97

.21

.20

.85

5.73

4.67

0.00

Si

Tl

AL

FE3

FE2

MM

Mo

CA

NA

K

P

H*

HC

S

AT0M5

WEIGHT

31.79

0.00

6.40

2.22

1.48

.15

.11

.59

4.10

3.74

0.00

.04

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

24.60

0.00

5.16

.87

.SB

.06

.10

.32

3.88

2.08

0.00

0

CB

OR

AB

AN

HE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGC-tFLG

1H Ftf-ilCS =

HEIGHT NORM

(100.0)

18.52

0.00

27.65

38.51

0.00

0.00

0.00

8.92

0.00

3.70

0.00

2.38

o.eo

.32

o.oo

0.00

0.00

0.00

0.00

0.00

.1*

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

19.80

0.00

27.82

38.75

0.00

0.00

0.00

0.00

2.37

3.76

0.00

7.49

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.07

c

ALIC

C/FM

Ql

3-COMPONENT

WT.PERCENTS

F 33.20

M 1.24

A 65.56

F 31.89

50.97

41.47

1041

TESCHtNITL (POSSIbLY FIASLI

15.37N 39.23E, HACASAT,

E. MANASSL, 1909

MASSA(,,A, ERITREA

SI02

TI02

AL2O3

FE2O3

FEU

MNO

MGU

CAO

NA2O

K2O

P2O5

H2O +

H2OCO2

SO3

TOIAL

ANALYSIS

46.20

.76

16.01

5.08

7.01

.16

5.07

7.09

6.50

2.04

.51

4.31

0.00

.21

0.00

0.00

0.00

0.00

0.00

100.95

lvATER-CO2-FKEE

(loo.o)

47.91

.79

16.60

5.27

7.27

.17

5.26

7.35

6.74

2.12

.53

SI

Tl

AL

Ft3

Ft2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

HEIGHT

21.58

.46

8.47

3.55

5.45

.12

3.06

5.07

4.82

1.69

.22

.05

0.00

.06

0.00

ATOMS

NUMBERS (100.0)

17.51

.22

7.15

1.45

2.23

.05

2.87

2.88

4.78

.99

.16

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

I N FEMCS =

HEIGHT NORM

(100.0)

0.00

0.00

12.50

20.61

8.70

19.62

0.00

0.00

0.00

lb.97

0.00

0.00

H.A3

7.64

0.00

1.49

0.00

0.00

1.15

.50

.68

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

12.63

14.90

8.79

23.13

0.00

0.00

0.00

19.75

o.oo

0.00

17.63

0.00

0.00

1.51

0.00

0.00

1.17

.50

.46

SI

AL

FM

C

ALK

K

MG

Tl

P

C/FM

OZ

no22.4

41.4

18.1

18.1

.17

.43

1.4

.51

.44

-63

3-COMPONENT

WT.PERCENTS

F 47.04

M 19.73

A 33.23

F 43.61

C 25.5H

A 30.81

N 41.59

K 13.05

C 45.36
OLIVINE BASALT

15.ION 38.55E. MAPAHAN-OI (,AALA VALLEY , SOUTH OF ASMARA, ERITREA

F. MAi<ASSE« 1909

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGU

CAO

NA20

K 2 0

P205

H20+

H20-

C 0 2

5 0 3

TOTAL

0

a

OR

AR

AN

NE

LC

AC

NS

D I

WO

HY

OL

MT

H"<

IL

T I

RU

AP

CC

MGO/Vi&OFfO

IN FEHICS =

ORIGINAL

ANALYSIS

46.96

1.45

15.19

8.35

7.30

.12

6.63

8.34

4.53

• 59

.17

1.09

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.72

IN EIGHT MOP. 11

(100.0)

o.oo

0.00

3.51

32.19

19.39

3.44

0.00

0.00

0.00

16.92

0.00

0.00

9.24

12. 18

0.00

2.76

0.00

0.00

. 3 7

0.00

. 8 3

WATER-CO2-FHEE

(100.0)

47.13

1.46

15.25

8.38

7.33

.12

6.65

8.37

4.55

.59

.17

NON-OXIDATION NORM

(FE203 CONVEKTED TO FEO)

0.00

0.00

3.56

22.90

19.71

8.61

0.00

0.00

0.00

18.06

0.00

0.00

23.77

0.00

0.00

2.81

0.00

0.00

.38

0.00

.48

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

<

P

H t

HC

s

0

ATOMS

WEIGHT

21.94

. 8 7

8.04

5.84

5.67

. 0 9

4.00

5.96

3.36

. 4 9

. 0 7

. 0 1

0.00

0.00

0.00

44.37

NIGGL1

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

ATOMS

NUMHEKS (100.0)

17.41

. 4 0

6.64

2.33

2.27

.04

3.67

3.31

3.26

.20

.05

60.33

104

19

49

19

10

2

8

7

9

b

0 8

4 4

4

16

4 0

-38

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

57. 12

24.20

18.69

53.76

76.65

17.59

33.66

4.38

61.96

No. 1042

REMARKS: See under 1035.

MINERALOGY: Aphyric. Groundmass: Labradorite,

titanaugite, altered olivine, magnetite, ilmenite, rar e

apatite.

OTHER INFORMATION: Doleritic olivine basalts from

Shicket (15. ION, 38.51E) contain amygdale zeolites

which have been analysed:

(1) (2) (3)

52.84 41.30

tr. 29.49

24.46 11.61

tr. 5.11

5.42 tr.

16.48 13.32

99.20 100.83

(1) chabazite (2) apophyllite (3) thomsonite.

No. 1043

REMARKS: See under 1035.

SiO2

A 1 2°3

C a O

Na2O

K

2°

H 2 O

Total

46.69

20.27

9.72

0.96

t r.

22.80

100.44

MINERALOGY: Scoriaceous rock. Phenocrysts: Augite,

corroded olivine. Groundmass: Glass, labradorite,

pyroxene, olivine?, ilmenite and magnetite, calcite,

apatite..

No. 1044

REMARKS: See under 1035. Published summation

101.49% can be accounted for by adding CO, content to

"loss on heating. "

MINERALOGY: Groundmass: Labradorite-bytownite,

abundant titanaugite, barkevikite, magnetite, ilmenite,

accessory apatite, calcite, serpentinite.

OTHER INFORMATION: Manasse also describes an

augitic camptonite from Suru in the Comayli Valley,

due west of Arafali.
1043

PORPHYRITIC O|_IVINL HASAI T

14.52N 39.54E, ALID VOLCANO, ERITREA

E. MANASSE. 1909

SI 02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H2UC02

S03

TOTAL

ORIGINAL

ANALYSIS

48.50

2.23

12.32

10.87

5.33

0.00

5.36

10.42

3.45

1.74

.24

.39

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.85

WATER-C02-FKEE

48.28

2.22

12.26

10.82

5.31

0.00

5.34

10.37

3.43

1.73

.24

(100.0)

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

Hc

s

ATOMS

WEIGHT

22.66

1.34

6.52

7.60

4.14

0.00

3.23

7.45

2.56

1.44

.10

.00

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

18.04

.62

5.40

3.05

1.6.6

0.00

2.98

4.15

2.49

.83

.08

0

Cf)

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

•ttlGHT NORM

(100.0)

0.00

0.00

10.26

29.05

12.e9

.03

0.00

0.00

0.00

28.73

.15

0.00

0.00

10.70

3.46

4.21

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

10.47

18.30

13.16

6.19

0.00

0.00

0.00

32.04

0.00

0.00

15.01

0.00

0.00

4.30

0.00

0.00

TI

P

C/FM

3-COMPONENT

WT.PERCENTS

F 60.56

M 20.04

A 19.40

F 50.93

C 32.76

A 16.37

N 22.10

K 11.15

C 66.75

CC

MGO/MGO+FEO

IN FEMICS =

1044

CAMPTONITt DYKE

15.04N 39.31E.

E. MANASSC 1909

MAI ENDA MARUGLO, COMAYLI RIVER . ERITREA

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

0R1GINA

ANALYS1

I

i

).O3

.48

.10

r.64

J.B7

).00

>.56

.02

..21

.67

.22

..35

.00

.17

).00

).00

).00

VJATER-C02-FHEE

(100.0)

50.65

2.56

12.50

7.B9

4.00

0.00

6.78

9.32

4.35

1.73

.23

SI

TI

AL

Ft3

Ft2

MN

MG

CA

NA

K

P

ATOMS

WEIGHT

22.91

1.49

6.40

5.34

3.01

0.00

3.96

6.45

3.12

1.39

.10

ATOMS

NUMBERS 1100.0)

18.54

.71

5.39

2.18

1.23

0.00

3.70

3.66

3.09

.81

.07

0

CB

OR

AB

AN

NE

LC

AC

NS

01

wo

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMC S =

WEIGHT NORM

(100.0)

0.00

0.00

10.09

36.43

9.32

0.00

0.00

0.00

0.00

21.45

0.00

1.48

3.70

5.42

4.07

4.BO

0.00

0.00

.49

2.72

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

10.25

30.54

9.47

3.49

0.00

0.00

0.00

23.05

0.00

0.00

15.07

0.00

0.00

4.88

0.00

0.00

.50

2.76

.60

C/FM

QZ

120

17.

3-COMPONENT

WT.PERCENTS

F 48.06

M 27.39

A 24.55

F 43.5B

C 34.15

A 22.26

N 28.26

K 11.21

C 60.54
PORPHYRITIC OLIVIN L fcASAlT

14.30.4 40.10E, 1-lARAHO VOLCANO, ERITREA

f . MANASSt, 1909

SI02

T102

AL203

FE2O3

FEO

MNO

MGG

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

SO3

TOTAL

OklGI'lAt

AUALYSI5

i.0.19

2.24

15.34

7.43

4.65

0.00

6.69

11.32

1.62

.63

.14

.34

CJ.00

0.00

0.00

0.00

0.00

0.00

0.00

100.79

WATER-C02-FKEE

(100.0)

49.97

2.23

15.27

7.40

4.63

0.00

6.66

11.27

1.81

.63

.14

SI

TI

AL

FE3

FE2

MN

Mb

CA

NA

K

P

H*

HC

S

0

ATOMS

WEIGHT

23.45

1.34

8.12

5.20

3.61

0.00

4.04

8.09

1.35

.52

.06

.00

0.00

0.00

0.00

45.01

ATOMS

NUMBERS (100.0

18

6

2

1

0

3

4

1

32

62

60

04

4?

00

65

43

29

29

04

61.30

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

It

TI

RU

AP

CC

MGO/MGO.FEO

IN FEMICS =

AtlSHT HOHK

(100.0)

H.23

0.00

3.71

15.36

31.66

0.00

0.00

0.00

0.00

18.33

0.00

8.12

0.00

a.49

1.56

4.23

0.00

0.00

.30

0.00

I.00

NOH-OXlDATION NORM NIGGLI

(FE2O3 CONVEKTED TO FEO)

1.02 SI

0.00

3.77

15.58 <

32.12 /

0.00 »

\L

'M

*LK

0.00 MG

0.00 TI

0.00 P

19.73 C/FM

0.00 OZ

23.18

0.00

0.00

0.00

4.29

0.00

0.00

.31

0.00

.58

117

21.1

45. 5

28.4

5.1

. i<;

.5

3.9

.14

.&;

-3

3-COMPONENT

WT.PERCEMS

F 56.93

M 31.53

A 11.55

,73

No. 1045

REMARKS: See under 1035. MnO trace.

MINERALOGY: Calcitic scoria. Phenocrysts: Zoned

bytownite-labradorite. Groundmass: Abundant brown

glass with minute iron-oxide crystals; An60-65, olivine,

pyroxene, magnetite, ilmenite.

OTHER INFORMATION: Some associated tuffs bear

43.06% SiO~. Extra basalt SiO_ determinations from

Manasse (1904, 1908, 1909). See also under 1001.

Porphyritic olivine basalt: Hyalobasalt:

Mt. Surrisan 48.78% Mt. Daggaro 49.25%

Mt. Darcot 48.31%

Mt. Carallumto 49.24%

Mt. Coma Chari 47.36%

No. 1046

50.68%

51.52%

SE flank Mt. Alid 50. 79%

REMARKS: See under 1035. Cl trace.

MINERALOGY: Groundmass: Dominant alkali feldspar

microlites; very small nephelines; wohlerite (rather than

lavenite); non-titaniferous magnetite; scarce apatite,

sodalite.

OTHER INFORMATION: For comments on the occurrence of wohlerite, see Rodolico & Pieruccini (1942,

p. 800-801).

No. 1047

REMARKS: See under 1035. MgO and P?O,. traces.

MINERALOGY: White porcellanous rock. Groundmass:

Pale yellow glass, sanidine, anorthoclase, magnetite,

zircon.

OTHER INFORMATION: Occurs intercalated in doleritic

basalts. Silicic tuff from between the Mesozoic sandstone and the basalts at Adi Quala yielded SiO? 71. 10%.
1046

TINGUAITh DYKL

14.40N 39.04E.

E. MAHAS5C, 1909

AZEO. HASAKO. ERITREA

SI02

TIO2

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K?U

P2O5

H20*

H2OC02

503

TOTAL

ORIGINAL

ANALYSIS

55.38

0.00

18.46

4.72

6.28

.19

1.19

3.93

7.55

2.94

.42

.36

0.00

0.00

0.00

0.00

0.00

0.00

0.00

101.42

UATER-CO2-FKEE

(100.0)

54.80

0.00

18.27

4.67

6.21

.19

1.18

3.89

7.47

2.91

.42

SI

TI

AL

Ft3

FE2

MM

M6

CA

NA

K

P

H»

HC

s

ATOMS

WEIGHT

25.87

0.00

9.77

3.30

4.68

.15

.72

2.81

5.60

2.44

.18

.00

0.00

0.00

0.00

ATOMS

NUMRERS (100.0)

19.69

0.00

7.73

1.26

1.87

.06

.63

1.50

5.21

1.33

.13

0

CR

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

IL

TI

RU

AP

CC

MGU/MOO+K.O

IN FfcNICS =

wtlGHT MORM

(100.0)

0.00

0.00

17.23

43.62

7.63

10.58

0.00

0.00

0.00

7.92

0.00

0.00

5.13

6.79

0.00

0.00

0.00

0.00

.91

o.oo

.33

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

17.39

38.79

7.70

13.61

0.00

0.00

0.00

8.15

0.00

0.00

13.45

0.00

0.00

0.00

o.oo 0.00

.92

0.00

.17

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

48.50

5.25

46.25

43.27

15.46

41.27

52.36

20.39

27.25

1047

TRAfHYTIC TUFF

14.55N 38.50E,

E. MANASSt. 1909

MAI MEIERE , ADI UGR1» ERITREA

SI02

TI02

AL203

FE203

FEO

MNO

MflO

CAO

NA20

<20

P2O5

H20 +

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

61.28

0.00

21.94

.48

0.00

0.00

0.00

.61

3.37

2.58

0.00

9.64

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.90

^,ATER-C02-FkEE

67.89

0.00

24.31

.53

0.00

0.00

0.00

.68

3.73

2.86

0.00

(100.0)

SI

TI

AL

FE3

Ft2

MN

M(j

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

28.63

0.00

11.61

.34

0.00

0.00

0.00

.44

2.50

2.14

0.00

.11

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

23.07

0.00

9.73

.14

0.00

0.00

0.00

.25

2.46

1.24

0.00

0

CFi

OR

AB

AN

NE

LC

AC

NS

DI

noHY

OL

MT

HM

IL

TI

RU

AP

CC

MflO/MGO-ff-EO

IN FEhlCS =

V.E1GHT NORM

(100.0)

33.65

13.63

16.94

31.68

3.36

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.53

0.00

0.00

0.00

0.00

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

33.33

13.85

16.96

31.71

3.37

0.00

0.00

0.00

0.00

0.00

0.00

.79

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

C/FM

OZ

3-COMPONFNT

WT.PERCENTS

F 7.47

M 0.00

A 92.53

F 6.8?

C 8.66

A 84.5?

N 51.37

K 39.33

C 9.30
14.43N 39.25E.

E. MANASSE, 1909

SENAFI, ERITREA

5I0Z

TI02

AL2O3

FE2O3

FEO

MNO

•»G0

CAO

NA<!0

K20

P205

H2G*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

70.36

0.00

16.90

.91

0.00

0.00

0.00

.4a

5.92

5.04

0.00

1.30

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.91

WATER-C02-FREE

(100.0)

70.64

0.00

16.97

.91

0.00

0.00

0.00

.48

5.94

5.06

0.00

SI

Tl

AL

Ft 3

Ffc2

MN

MG

CA

NA

K

P

H*

HC

S

0

ATOMS

WEIGHT

32.87

0.00

8.94

.64

0.00

0.00

0.00

.34

4.39

4.18

0.00

.02

0.00

0.00

0.00

49.53

ATOMS

NUMBERS (100.0)

24.20

0.00

6.85

.24

0.00

0.00

0.00

.18

3.95

2.21

0.00

62.37

0

C9

OR

AB

AN

NE

LC

AC

MS

Dl

MO

HY

OL

MT

H*l

IL

TI

RU

AP

CC

W(iO/MGO»FF'O

IN FE.MICS =

wtlGHT NORM

(100.0)

15.47

.80

29.99

50.42

2.40

0.00

0.00

0.00

0.00

0.00

o.oo

0.00

0.00

0.00

.92

0.00

0.00

0.00

0.00

0.00

0.00

NON-OX 1DAT ION NORM

(FE2O3 CONVERTED TO FEO)

14.86

.80

30.04

50.51

2.40

0.00

0.00

0.00

0.00

0.00

0.00

1.36

0.00

0.00

0.00

0.00

0.00

0.00

0.00

o.oo

0.00

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

349

49.

3.

2.

4 4.

0.

0.

0.

71

3-COMPONENT

WT.PERCENTS

F 7.67

M 0.00

A 92.33

F 7.37

C 3.09

A 88.74

N 51.75

K 44.06

C 4.20

NO. 1048

REMARKS: See under 1035. No separate determination

of FeO; MgO trace.

MINERALOGY: Very fine grained. Groundmass: Veryabundant Na-feldspar, scarce quartz, no femics, no

nepheline.

No. 1049

REMARKS: See under 1035. MnO,

 p

2 ° 5 '

 SO 3 ' C 1

traces.

MINERALOGY: Filamented, very porous pumice.

Phenocrysts: Large zoned anorthoclase, with inclusions

of glass, apatite, magnetite, green pyroxene, cossyrite.

Groundmass: Glass (n 1.4958), no microlites.

OTHER INFORMATION: Other SiO2 determinations on

pumices: Alid, 67.45%; Deri, 72.50%.

No. 1050

REMARKS: See under 1035. MnO and P2°5 traceS-

MINERALOGY: Medium-grained (dyke?). Phenocrysts:

Micro-phenocrysts of Na-sanidine, riebeckite, scarce

aegirine. Groundmass: Alkali feldspar, quartz.
1049

ANORTHOCLASL PUMICL

14.52N 39.54E, ALID VOLCANO, ERITREA

E. MANASSE. 1909

SI02

TI02

AL203

FE2O3

FEO

MNU

MtiO

CAO

NA20

K20

P2O5

H20t

H20-

C02

S03

TOTAL

ORIGINAL

ANALYS1S

71.08

0.00

13.46

1.57

1.38

0.00

.31

.95

6.38

4.55

0.00

2.10

0.00

0.00

0.00

0.00

0.00

0.00

0.00

101.78

hATER-C02-FKEE

(100.0)

71.31

0.00

13.50

1.58

1.38

0.00

.31

.95

6.40

4.56

0.00

SI

TI

AL

Ft3

Ft2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

HEIGHT

33.21

0.00

7.12

1.10

1.07

0.00

.19

.68

4.73

3.7B

0.00

.02

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

24.63

0

5

0

2

0

00

50

41

40

00

16

35

?9

01

00

0

Cfl

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

WEIGHT NORM

(100.0)

17.88

0.00

27.05

44.01

0.00

0.00

0.00

4.57

1.19

4.07

0.00

1.23

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

18.65

0.00

27.13

44.14

0.00

0.00

0.00

0.00

2.40

4.15

0.00

3.53

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

MGO/MGO+fEO

IN FEMICS =

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

340

38.0

13.4

4.9

43.7

.3?

.17

0.0

0.00

.36

83

3-COMPONENT

WT.PERCENTS

F 20.79

M 2.18

A 77.03

F 19.89

53.70

38.30

8.00

1050

PAISANITt

14.45N 39.06E,

E. MANAS5L, 1909

AMBA TUKILAY , ERITREA

SI02

TI02

AL203

FE2O3

FEO

MNO

MGU

CAJ

NA20

K2U

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

71.98

0.00

14.48

.88

.92

0.00

.28

.76

5.98

3.71

0.00

.e5

0.00

0.00

0.00

0.00

0.00

u.oo

0.00

99.84

WATER-C02-FREE

(100.0)

72.71

0.00

14.63

.89

.93

0.00

.28

.77

6.04

3.75

0.00

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

..EIGHT

33.63

0.00

7.66

.62

.72

0.00

.17

.54

4.44

3.08

0.00

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0

24.91

0

5

0

4

1

0

00

91

23

27

00

14

?8

01

64

00

0

ce

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

IL

TI

RU

AP

CC

MGO/MGC+^0

IN FEMICS =

WEIGHT NORM

(100.0)

21.01

0.00

22.21

51.25

1.65

0.00

0.00

0.00

0.00

1.82

0.00

.77

0.00

1.29

0.00

0.00

0.00

0.00

0.00

0.00

.49

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

20.10

0.00

22.25

51.34

1.65

0.00

0.00

0.00

0.00

1.88

0.00

2.78

0.00

0.00

0.00

0.00

0.00

o.oo

0.00

0.00

.23

c

ALK

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 15

N

K

C

D.I.

57

35

7

86

.22

.50

.27

.54
1051

AMPHlBOLt FLLSO-jAclTE UELOFC TuFF)

14.52U 39.54E, ALID VOLCANO, ERITREA

F. MANASSE, 1909

SI02

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H?0-

C02

S03

TOTAL

Q

en

OR

An

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

II.

TI

RU

AP

CC

MGO/MGOtFEO

IN FEKICS =

OKIGI.SAL

ANALYSIS

72.02

0.00

14.44

1.32

1.04

0.00

.41

• 9B

6.10

4.26

0.00

.35

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.92

WEIGHT MORM

(100.0)

18.05

0.00

25.10

50.24

0.00

0.00

0.00

1.07

0.00

4.02

0.00

.14

0.00

1.37

0.00

0.00

0.00

0.00

0.00

0.00

.54

WATEK-C02-FHEE

(100.0)

71.61

0.00

14.36

1.31

1.03

0.00

.41

.97

6.07

4.24

0.00

NON-OXIDATIUN NORM

(FE2O3 CONVERTED TO FEO)

17.26

0.00

25.17

50.37

0.00

0.00

0.00

0.00

.28

4.19

0.00

2.73

0.00

0.00

0.00

0.00

0.00

0.00

o.oo

0.00

.26

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

33.65

0.00

7.64

.92

.81

0.00

.25

.70

4.53

3.54

0.00

.00

0.00

0.00

0.00

48.89

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

ATOMS

NUMBERS (100.0)

24.64

0.00

5.82

.34

.30

0.00

.21

.36

4.05

1.86

0.00

62.42

348

41.1

12.0

5.1

41.8

.31

.25

0.0

0.00

.42

82

3-COMPONENT

WT.PERCENTS

F 17.97

NO. 1051

REMARKS: See under 1035. MnO,

 p

2°5' S °3

 traces

-

MINERALOGY: Schlieren contain alkali feldspar and

brown amphibole. Phenocrysts: Micro-phenocrysts of

andesine-oligoclase. Groundmass: Micro-feldsitic,

with tridymite cavities; also, glass, magnetite, apatite,

fresh mica, brown amphibole rimmed with iron-oxide

and diopside.

OTHER INFORMATION: Other SiO2 determinations:

South rim of Alid caldera, hornblende felsodacite 71.60%,

hornblende hyalodacite 68.28%;

Hewchew, SW of Deggherto, hyalodacite 67.36%.

No. 1052

REMARKS: See under 1035. MgO trace.

MINERALOGY: Groundmass: Colourless glass (n 1.49);

spherulites with microlites of alkali feldspar and augite.

OTHER INFORMATION: Other SiO2 determinations on

obsidians: West flanks Alid, 71. 19%; Agoghito, SE of

Alid, 73.65%.

No. 1053

REMARKS: See under 1035. MnO trace.

MINERALOGY: Mariolitic cavities with tridymite

(n 1.474). Groundmass: Microfelsitic and spherulitic,

with schlieren; alkali feldspar; kataphorite, magnetite,

calcite.
1052

COMENDlTIC ObSlDlAN

14.51N 39.52E, NEAR BOYA,

E. MANASSEt 1909

ALID VOLCANO, ERITREA

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K2O

P2O5

H2O*

H2OC02

S03

TOTAL

ORIGINAL

ANALYSIS

72.46

0.00

13.96

1.65

.69

0.00

0.00

.Bl

5.69

5.16

0.00

.17

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.79

WATSR-C02-FREE

(100.0)

72.01

0.00

13.87

1.64

.88

0.00

0.00

.81

5.65

5.13

0.00

SI

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

H +

HC

S

ATOMS

WEIGHT

33.85

0.00

7.39

1.15

.69

0.00

0.00

.58

4.22

4.28

0.00

.00

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

24.85

0.00

5.64

.43

.26

0.00

0.00

.30

3.79

2.26

0.00

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HI

IL

TI

RU

AP

CC

IN FEMC S =

WEIGHT NORM

(1OO.O)

18.91

0.00

30.39

42.77

o.oo 0.00

0.00

4.59

0.00

2.97

.2b

0.00

0.00

.09

0.00

0.00

0.00

0.00

0.00

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

19.63

0.00

30.49

42.91

0.00

0.00

0.00

0.00

1.22

3.58

0.00

2.18

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

FM

cALK

K

MG

TI

10.0

4.4

44.3

.3

0.0

0.0

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

18.97

0.00

81.03

17.89

5.70

76.41

48.80

44.25

1053

PORPHYRITIc TKlHYMlTF COiFNiDlTE (wELDtD TUFF)

14.41N 40.0SE, cADDA AND SAVOITI, EMTREA

E. MAIiASSE. 1909

SI02

TIU2

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2U5

H20+

H20-

C02

S03

TOTAL

OR I d (At.

ANALYSIS

72.8B

0.00

13.86

1.52

.73

0.00

.23

l.HZ

3.98

4.40

0.00

.52

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.94

wATER-C02-Fr(EE

73.31

0.00

13.94

1.53

.73

0.00

.23

1.83

4.00

4.43

0.00

(100.0)

SI

Tl

AL

FE3

FE2

MN

MO.

CA

NA

K

P

H+

HC

S

ATOMS

WEIGHT

34.05

0.00

7.33

1.06

.57

0.00

.14

1.30

2.95

3.65

0.00

.01

0.00

0.00

0.00

ATOMS

NUHBERS (100.0)

25.27

0.00

5.66

.40

.21

0.00

.12

.68

2.68

1.95

0.00

0

CO

OR

A8

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

WtlGHT MORM

(100.0)

29.08

0.00

26.23

33.96

6.94

0.00

0.00

0.00

0.00

1.41

.16

0.00

0.00

2.22

0.00

0.00

o.oo 0.00

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

27.54

0.00

26.31

34.06

6.96

0.00

0.00

0.00

0.00

1.90

0.00

3.23

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

TI

p

C/FM

oz

0

0

144

.0

.00

.93

3-COMPONENT

WT.PERCENTS

F 20.72

M 2.12

A 77.16

F 18.07

C 14.67

A 67.31

N 39.0?

K 43.14

C 17.84

MG0/MG0*FEO

IN FEMICS =
1054

OUARTZ-bOSTOMITE DYKE

14.43M 39.25E, SENAFI, ERITREA

E. MANASSE» 1909

5102

TIU2

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K2U

P2O5

H20*

H20-

C02

S03

TOTAL

OHICI'IAL

ANALYSIS

73. 44

0.00

14.35

.50

0.00

0.00

.39

.S3

i>.74

3.«2

o.no

.67

0.00

O.CO

0.00

0.00

0.00

0.00

0.00

99.44

k,ATER-C02-FKEE

(100.0)

74.35

0.00

14.53

.51

0.00

0.00

.39

.54

5.81

3.87

0.00

SI

TI

AL

FE3

FL2

MN

MG

CM

NA

K

P

H*

HC

S

0

ATOMS

WEIGHT

34.31

0.00

7.59

.35

0.00

0.00

.24

.38

4.26

3.17

0.00

.01

0.00

0.00

0.00

49.14

ATOMS

NUMBERS (100.0)

25.31

0.00

5.83

.13

0.00

0.00

.20

.70

3. 84

1.68

0.00

62.81

0

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

cc

fttlGHT r-lOPM

(1CO.O)

23.96

0.00

22.92

49.31

2.06

0.00

0.00

0.00

0.00

• 4ft

0.00

.76

0.00

0.00

• ?1

0.00

0.00

0.00

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVEKTED TO FEO)

23.64

0.00

22.95

49.36

2.06

0.00

0.00

0.00

0.00

.50

0.00

1.50

0.00

0.00

0.00

0.00

0.00

o.oo

0.00

0.00

NIbGLI

SI

AL

FM

c

ALK

K

MG

TI

P

C/FM

oz

407

4 7.

5.

3.

4 4.

0.

0.

129

In FfcMCS - 1.00

3-COMPONENT

KT.PtRCENTS

F 4.7«

4.72

5.00

90.27

56.89

37.86

No. 1054

REMARKS: See under 1035. No separate determination

of FeO; P2O trace.

MINERALOGY: Phenocrysts: Albite, sanidine, quartz.

Groundmass: Quartz, albite, K-feldspar, magnetite,

kataphorite?.

No. 1055

REMARKS: See under 1035. MnO trace.

MINERALOGY: Phenocrysts: Na-feldspar. Groundmass:

Fluidal tecture; sanidine more abundant than quartz;

scarce magnetite, kataphorite(?).

No. 1056

REMARKS: See under 1035.

MINERALOGY: Black, compact, very fine-grained rock.

Phenocrysts: Extremely rare labradorite. Groundmass:

Fresh labradorite, with apatite inclusions; pale-green

augite, small rounded and altered olivines; common

magnetite, ilmenite; some devitrified glass.
1055

nuARTZ BOSTONITE DYKE

14.37N 39.25E, (JARAKIT,

E. MANASSt. 1909

SI02

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O +

H2OC02

SO3

TOTAL

ANALYSIS

74.72

0.00

13.38

1.29

.77

0.00

.35

.18

4.27

3.94

0.00

1.4ft

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.36

WATER-C02-FREE

(100.0)

75.56

0.00

13.53

1.30

.78

0.00

.35

.18

4.32

3.98

0.00

SI

TI

AL

FE3

FE2

MM

M6

CA

NA

K

P

H+

HC

S

ATOMS

WEIGHT

34.91

0.00

7.08

.90

.60

0.00

.21

.13

3.17

3.27

0.00

.02

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

2 5. S6

0.00

5.46

.34

.22

0.00

.18

• 07

2.87

1.74

0.00

0

CB

OR

AS

AN

NF.

LC

AC

NS

DI

k»0

HY

OL

MT

HM

IL

TI

RU

AP

CC

IN FEMcS =

WEIGHT NORM

(100.0)

33.96

1.76

23.61

36.63

.91

0.00

0.00

0.00

0.00

0.00

0.00

1.24

0.00

1.90

0.00

0.00

0.00

0.00

0.00

0.00

.77

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

32.66

1.76

23.67

36.72

.91

0.00

0.00

0.00

0.00

0.00

0.00

4.27

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.26

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

442

46.7

12.7

1.1

39.5

.38

.24

0.0

0.00

.09

184

3-COMPONENT

WT.PERCENTS

F 19.40

19.71

1.72

78.56

50.89

46.96

1056

AuGITt-OLlVlNE BASALT

03.42M 42.3BE, CURETCA HILL,

E. MANASSt, 1917

SIU2

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K2U

P2O5

H20»

H20-

C02

S03

TOTAL

ORIGIMA L

ANALYSIS

47.81

2.3

14.2'

4.2'

8.8

.4C

6.5<

10.86

3.37

.91

.22

1.08

0.00

0.00

0.00

0.00

0.00

0.00

0.00

101.0

k,ATER-C02-FREE

(100.0)

47.88

2.39

14.25

4.24

8.81

.49

6.56

10.87

3.37

.91

.22

SI

TI

AL

Ft3

FE2

MN

MG

CA

NA

K

P

H»

HC

s

ATOMS

WEIGHT

22.36

1.43

7.53

2.97

6.85

.38

3.96

7.76

2.50

.76

.10

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

17.74

6

1

2

3

4

2

67

22

18

74

15

63

32

42

43

07

0

CB

OR

AS

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FLO

IN FEMICS =

WEIGHT NORM

(100.0)

0.00

0.00

5.39

24.71

21.01

2.10

0.00

0.00

0.00

25.80

0.00

0.00

9.81

6.16

0.00

4.54

0.00

0.00

.48

0.00

.69

NON-OXIDATION NORM

(FE203 CONVEKTED TO FEO)

0.00

0.00

5.44

19.99

21.18

4.78

0.00

0.00

0.00

26.61

0.00

0.00

16.95

0.00

0.00

4.57

0.00

0.00

.49

0.00

.52

FM

C

ALK

K

MG

TI

P

C/FM

QZ

46.5

26.1

8.6

. 1!

.47

4.0

.21

.56

-28

3-COMPONENT

WT.PERCENTS

F 54.63

M ?7.46

A 17.9?

F 46.29

C 38.5?

A 15.18

N 22.26

K 6.01

C 71.73
1057

TING;MITL

02.41H 42.21E,

F. MANASSL, 1917

DECOER PLAIN. 5 KM N.». OF ALLENuO, SOMALI

SI02

TIU2

AL203

FE2O3

FEO

MNO

KGO

CAO

NA20

K2G

P2O5

H2U*

H2OCO2

SO3

CL

-0

TOTAL

ANALY5I

54.33

0.00

20.24

3.40

2.59

.23

.R7

1.65

8.10

5.19

0.00

4.03

0.00

0.00

0.00

• 41

0.00

0.00

-.09

100.95

WATER-C02-FKEE

(100.0)

56.24

0.00

20.95

3.52

2.6H

.24

.90

1.71

8.39

5.37

0.00

51

Tl

AL

FE3

FE2

MN

Hi

CA

NA

K

P

H +

HC

S

ATOMS

WEIGHT

25.38

0.00

10.71

2.38

2.01

.18

.52

1.18

6.01

4.31

0.00

.05

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

19.86

0.00

8.72

.94

• 79

.07

.47

.65

5.74

2.42

o.oo

0

CB

OR

An

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

Tl

RU

AP

CC

MGU/MGOtFEO

IlM FEMICS =

WEIGHT NORM

(100.0)

0.00

0.00

31.83

32.53

3.55

20.90

0.00

0.00

0.00

4.10

0.00

0.00

1.97

5.12

0.00

0.00

0.00

0.00

0.00

O.CO

.55

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

32.04

28.67

3.58

23.25

0.00

0.00

0.00

4.31

0.00

0.00

8.15

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.22

NIGOLl

SI

AL

FM

C

ALK

K

MG

Tl

P

C/FM

02

174

38.3

20.0

5.7

36.0

.30

.21

0.0

0.00

.28

-69

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

U.I.

79.73

4.32

65.96

28.62

7.88

63.50

54.22

34.74

11.04

87.32

No. 1057

REMARKS: See under 1035. TiO2 and P2O5 traces.

MINERALOGY: Holocrystalline, very fine-grained.

Phenocrysts: Sanidine, nepheline, rare pale-green

augite. Groundmass: Dominant sanidine; subordinate

fresh nepheline; rare sodalite (analysis suggests 5-6%

in mode); aegirine, in minute aggregates, is commoner

than cossyrite; accessory apatite.

OTHER INFORMATION: This rock-type forms numerous

small hills on the Degder plain.

No. 1058

MINERALOGY: Phenocrysts: Anorthoclase, quartz.

Groundmass: Fluidal texture; quartz, alkali feldspar,

glass, arfvedsonite-riebeckite, rare sodic pyroxene.

No. 1059

REMARKS: P2O5 trace.

MINERALOGY: Trachytic texture. Phenocrysts:

Abundant small anorthoclase; zoned aegirine-augite

(aegirine margins); rare sodalite?, arfvedsonite,

cossyrite. Groundmass: Alkali feldspar, arfvedsonite.

Fe-rich olivine, quartz, apatite.

OTHER INFORMATION: Pantellerite from Nomenta-ali

(see 1058) contains riebeckite-arfvedsonite and zircon.
1058

ARFVEDSDN1TE TRACHYTE

13.13N 42.05E. NO^ENTA-ALIi

M. DE ANGEL1S, 1923

GAHARRI, AFAR

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P205

H20 +

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

65.58

.55

13.Bl

5.51

.38

.06

.14

.47

6.26

4.72

.06

.85

.90

0.00

0.00

0.00

0.00

0.00

0.00

99.29

WATER-C02-FNEE

(100.0)

67.23

.56

14.16

5.65

.39

.06

.14

.48

6.42

4.84

.06

SI

Tl

AL

FE.3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

30.64

.33

7.31

3.85

.30

.05

.08

.34

4.64

3.92

.03

.01

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

23.52

.15

5.84

1.49

.11

.02

.07

.18

4.35

2.16

.02

0

CB

OR

AB

AN

NE

LC

AC

N5

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGOtl-tO

IlM FEMICS =

WEIGHT N0r:M

(100.0)

12.55

0.00

28.67

45.84

0.00

0.00

0.00

7.58

0.00

.77

.35

0.00

0.00

0.00

3.05

.96

.10

0.00

.13

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

11.80

0.00

28.99

46.34

0.00

0.00

0.00

0.00

2.02

1.82

0.00

7.81

0.00

0.00

0.00

1.08

0.00

0.00

.14

0.00

.05

p

C/FM

OZ 42

,11

,11

3-C0MP0NENT

WT.PERCENTS

F 34.63

M .82

A 64.55

F 33.97

54.67

41.22

4.10

1059

PANTELLtKITL

13.2IW 42.02E, ID AMAflA,

M. DE ANGELIS, 1923

•w. OF BAHARASSOLI, ERITREA

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20+

H20-

C02

S03

TOTAL

(JKICINAi

ANALYSIS

69.41

.20

13.31

3.85

.92

• 09

.17

.74

6.13

4.53

0.00

.73

.36

0.00

0.00

0.00

0.00

0.00

0.00

100.44

wATER-C02-FkEE

69.86

.20

13.40

3.88

.93

.09

.17

.74

6.17

4.56

0.00

(100.0)

SI

TI

AL

FE3

Ffc2

MN

M&

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

32.43

.12

7.04

2.69

.72

.07

.10

.53

4.55

3.76

0.00

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

24.30

.05

5.49

1.02^

.27

.03

.09

.28

4.16

2.02

0.00

0

CB

OR

An

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGU/MGO*FEO

IN FtMICS =

FLIGHT NORM

(100.0)

17.05

0.00

27.02

43.49

0.00

0.00

0.00

7.80

0.00

1.97

.56

0.00

0.00

1.73

0.00

.38

0.00

0.00

0.00

0.00

.50

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

17.14

0.00

27.22

43.81

0.00

0.00

0.00

0.00

2.08

3.30

0.00

6.06

0.00

0.00

0.00

.39

0.00

0.00

0.00

0.00

.07

3-COMPONENT

WT.PERCENTS

F 30.5H

M 1.09

A 68.33

F 29.50

C 4.58

A 65.92

N 53.77

K 39.74
1060

COMENDlTE

13.28N 42.02E, ID

M. DE ANGLLIS. 19i3

S.w. OF [,AHARASSOLI . ERITREA

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20+

H20-

C02

S03

TOTAL

0

cn

OR

AB

AN

NE

LC

AC

N5

DI

WO

HY

OL

MT

H'VI

IL

TI

RU

A I'

CC

ORIGINAL

ANALYSIS

78.S6

. 2 0

11.47

. 6 4

. 0 4

. 0 3

. 1 8

• 19

3.62

4.58

0.00

. 0 4

. 0 2

0.00

0.00

O.CO

0.00

0.00

0.00

99.57

wfclGHT I-IOKM

(100.0 )

39.34

. 1 9

27.28

30.87

. 9 5

0.00

0.00

0.00

0.00

0.00

0.00

. 4 5

0.00

0.00

. 6 4

. 1 5

0.00

. 1 2

0.00

0.00

WATER-C02-FREE

(100.0)

78.95

. 2 0

11.53

. 6 4

. 0 4

. 0 3

. 1 8

. 1 9

3.64

4.60

0.00

NON-OX I DAT I ON NORM

(FE2O3 CONVERTED TO FEO)

39.04

. 1 9

27.32

30.91

. 9 5

0.00

0.00

0.00

0.00

0.00

0.00

1.21

0.00

0.00

0.00

. 3 8

0.00

0.00

0.00

0.00

SI

TI

AL

FE3

FE2

MN

MS

CA

NA

K

P

H+

HC

s

0

ATOMS

WEIGHT

36.70

.12

6.07

.45

.03

.02

. 1 1

. 1 4

2.69

3.80

0.00

. 0 0

. 0 0

0.00

0.00

49.44

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

ATOMS

NUMBERS (100.0 )

26.93

.05

4.63

.17

.01

.01

.09

• 07

2.41

2.00

0.00

63.63

552

47.5

5.7

1.4

45.3

.45

.33

1.1

0.00

.25

271

3-COMPONENT

wT.PERCENTS

F 7.51

M 1.99

A 90.51

F 7.50

C 2.09

A 90.41

N 43.15

K 54.59

C 2.26

IN FtKICS - 1.00

No. 1060

MINERALOGY: Phenocrysts: Abundant corroded quartz,

anorthoclase?. Groundmass: Very fine-grained quartz

and alkali feldspar, sometimes as spherulites; rare

iron-oxide, brown amphibole.

OTHER INFORMATION: Comendite from Nomenta-ali

(see 1058) is similar to the above, plus containing some

rare aegirine.

No. 1061

REMARKS: CO£ figure derived from "calcining. "

MINERALOGY: A slightly weathered rock. Phenocrysts:

Zoned andesine-labradorite, rare augite, analcime?.

Groundmass: Fluidal texture; oligoclase-andesine, green

pyroxene, hornblende (with rim reactions), apatite,

magnetite; nodules of brown basic material contain

chlorite-rimmed epidote, and augite and hornblende.

No. 1062

MINERALOGY: Phenocrysts: Zoned Anl5-20 (ca. 2 cm

long), augite and zoned aegirine-augite, rare brown

hornblende. Groundmass: Trachytic groundmass;

Trachytic groundmass; feldspar (orthoclase?), aegirineaugite and associated analcime, apatite, magnetite.

Norm suggests analcime could be secondary after

nepheiine.

OTHER INFORMATION: Analysis (%) of the oligoclase

phenocrysts (contaminated with some analcime):

SiO2 61.79

A1-.O., 22.61

0.34

MgO 0.11 Total 99.99

Other specimens from Adaylo and Assacoma contained

large oligoclase-andesine and brown hornblende

phenocrysts.

F e2°3

C aO

Na2°

K-,O

3 .

9.

1.

12

65

15
1061

SODIC TRACHYANutSITE

14.32N 4O.53E, wALELl, A5SAco»iA. ERITREA

». DE ANGELIS, 1925

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2U

P2O5

H2O +

H2OCO2

SOi

OKlGlrJAl

ANALYSI S

56.5 5

• 6 7

17.7 *

3.7 6

2.8 2

.19

.98

4.3 9

7.5 5

1.7 4

• 8 1

1.7 5

.20

.05

0.0 0

0.0 0

0.0 0

0.0 0

fcATfcR-C02-FI<EE

(100.0)

58.18

.69

18.25

3.87

2.90

.20

1.01

4.52

7.77

1.79

.83

51

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

26.42

.40

9.39

2.63

2.19

.15

.59

3.14

5.60

1.44

.35

.02

.00

.01

0.00

ATOMS

NUMBERS (100.0)

20.50

7

1

1

5

18

58

03

86

06

53

71

31

81

25

0

c*

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MG0*FEU

IN FtMC S =

WEIGHT NOPM

(100.0)

0.00

0.00

10.60

62.12

9.56

2.02

0.00

0.00

0.00

6.21

0.00

0.00

.63

5.62

0.00

1.31

0.00

0.00

1.82

.12

.71

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

10.68

58.09

9.63

4.46

0.00

0.00

0.00

6.67

0.00

0.00

7.20

0.00

0.00

1.32

0.00

0.00

1.B4

.12

.24

TI

P

C/FM

OZ

1.7

1.13

.69

-25

3-COMPONENT

WT.PERCENTS

F 39.05

M 5.87

A 55.13

32.48

21.67

45.85

55.19

12.72

32.09

1062

•DANCALlTt* (ANALCIME TRACHYTE)

14.32N 40.53E, ASSACOMA , ERITREA

M. DE ANGILIS. 1925

SIU2

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20 +

H20-

C02

S03

TOTAl

ORIGINA|

ANALYSIS

57.94

.58

18.22

3.56

2.42

.19

.75

3.59

8.53

2.08

.25

1.86

.12

0.00

0.00

0.00

0.00

0.00

0.00

100.09

WATER-C02-FREE

(100.0)

59.06

.59

18.57

3.63

2.47

.19

.76

3.66

8.69

2.12

.25

SI

TI

AL

Ft3

Ft2

MN

M6

CA

NA

K

P

H+

HC

s

ATOMS

WEIGHT

27.07

.35

9.64

2.49

1.88

.15

.45

2.57

6.33

1.73

.11

.02

.00

0.00

0.00

ATOMS

NUMBERS (100.0

20.72

7

1

5

16

68

96

73

06

40

38

92

95

08

0

CB

OR

AS

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

Ar>

CC

Ih FEMICS =

WEIGHT NORM

(1OO.OI

0.00

0.00

12.56

60.35

5.29

7.25

0.00

o.oo 0.00

5.85

1.74

0.00

0.00

5.27

0.00

1.12

0.00

0.00

.56

0.00

.73

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

12.65

55.57

5.33

10.12

0.00

0.00

0.00

9.97

0.00

0.00

4.68

0.00

0.00

1.13

0.00

0.00

.56

0.00

.21

AL

FM

C

ALK

K

MG

TI

P

C/FM

02

192

35.

19.

12.

31.

1.

-36

3-COMPONENT

WT.PERCENTS

F 34.49

29.63

17.79

52.5«

60.07

14.65

25. 2R
1063

TRAcHYjjOLtRlTE

15.22N 44.lit ,

D. ROMAN, 1926

NKARA lITI c i fc

SANA, vE-'EN

SIU2

TI02

AL203

FE203

FEQ

MNO

MGO

CAG

NA20

K20

P2U5

H2CH

H20-

C02

S03

TOTAL

O«I&I,A L

ANALYSIS

41.P2

1.05

11.07

8.59

10.10

1.05

5.32

ltj.47

1.31

.84

.55

.76

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.93

V>ATER-C02-F*EE

(100.0)

41.75

1.05

11.05

8.58

10.08

1.05

5.31

18.44

1.31

.84

.55

SI

TI

AL

FE3

FE2

MN

M6

CA

NA

K

P

Ht

Hc

s

0

ATOMS

WEIGHT

19.54

.63

5.86

6.01

7.85

.81

3.21

13.20

.97

.70

.24

.01

0.00

0.00

0.00

41.91

ATOMS

NUMBERS (100.0)

16

5

2

3

3

7

21

31

06

51

28

35

08

67

99

42

18

59.96

S10 2 L-EFIC11

0

CP

OR

AS

AN

ME

LC

AC

MS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/M&Otf-EO

IN FtMCS =

-.05

k.tlGHT NORM

(100.0)

0.00

0.00

0.00

0.00

21.77

6.00

3.P9

0.00

0.00

50.53

2.21

0.00

0.00

12.45

0.00

1.99

0.00

0.00

1.20

0.00

.60

-5.14

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

0.00

0.00

22.14

6.10

3.96

0.00

0.00

57.66

0.00

0.00

12.13

0.00

0.00

2.02

0.00

0.00

1.22

0.00

.36

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

80

12.

45.

38.

3.

1.

-34

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

71.44

70.34

8.22

47.55

46.99

5.47

fc.35

4.07

R9.57

No. 1063

REMARKS: MnO values in the analyses of Roman (1926)

are distinctly too high; the value of these analyses is

further reduced by the evident transposition of some of

the mineralogical descriptions from their related analyses

(eg. see 10761). H?O+ values refer to loss on heating.

MINERALOGY: Phenocrysts: Serpentinised zoned augitediopside. Groundmass: An45-55, pyroxene, magnetite,

apatite.

OTHER INFORMATION: Specific gravity 3. 158.

No. 1064

REMARKS: See under 1063.

MINERALOGY: Refers to a rock other than the analysed

specimen? Groundmass: Trachytic texture. An20-25,

quartz, chlorite, calcite, often as spherulites.

No. 1065

REMARKS: See under 1063.

MINERALOGY: Phenocrysts: An60-70, diallage-diopside.

Groundmass: Plagioclase, pyroxene, magnetite, orthoclase; veins of chlorite, quartz, calcite.

OTHER INFORMATION: Specific gravity 2.893.
1064

TRACHYANDESITE QMU&EARITE"

14.56N 43.32E. HAJELA.J . SAFASSAT I

D. ROMAN. 1926

SI02

TI02

AL2O3

FE203

FEO

MNO

MGU

CAO

NA20

K2O

P2O5

H2O+

H2OC02

SO3

TOTAL

ORIGINAL

ANALYSIS

46.59

0.00

9.54

16. 82

7.59

.89

4.87

7.05

4.27

.60

0.00

1.80

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.02

k«ATER-C02-FKEE

(100.0)

47.43

0.00

9.71

17.12

7.73

.91

4.96

7.18

4.35

.61

0.00

SI

Tl

AL

FE3

FE2

MN

MS

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

21.77

0.00

5.05

11.76

5.90

.69

2.94

5.04

3.17

.50

0.00

.02

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

18.12

0.00

4.37

4.93

2.47

.29

2.83

2.94

3.22

.30

0.00

0

CB

OR

AH

AN

NE

LC

AC

NS

DI

wo

HY

OL

MT

HM

IL

TI

RU

AO

CC

MGO/MGCH-FEO

IN FEMC S =

HEIGHT NORM

(100.0)

2 . t-B

o.oo 3.62

36.84

5.14

0.00

0.00

0.00

0.00

24.10

o.oo

2.75

0.00

24. C7

0.00

0.00

0.00

0.00

0.00

0.00

.90

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

3.74

25.55

5.31

6.79

0.00

o.oo 0.00

27.14

0.00

o.oo 31.47

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.28

SI

AL

FM

C

ALK

K

MG

TI

P

104

12.5

60.4

16.9

10.1

.08

.27

0.0

0.00

3-COMPONENT

WT.PERCtNTS

F 71

M 14

A 14

F 67

C 19

A 13

.48

.26

.26

.19

.41

.40

1065

TRACHYDOLLRITL

15.22N 44.HE,

D. RtViAN. 1926

SANA. YE/EN

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20+

H20-

C02

S03

TOTAL

ORIGINAL

AHALYSI5

47.84

.12

13.08

8.04

6.96

1.12

3.41

10.08

4.23

2.55

1.35

.87

0.00

0.00

0.00

0.00

0.00

U.OO

0.00

99.65

V.ATER-C02-FREE

(100.0)

48.43

.12

13.24

8.14

7.05

1.13

3.45

10.20

4.28

2.58

1.37

51

Tl

AL

FE3

FE2

MN

M3

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

22.35

.07

6.92

5.62

5.41

.87

2.06

7.20

3.14

2.12

.59

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

18.11

.03

5.84

2.29

2.21

.36

1.93

4.09

3.11

1.23

.43

0

cn

OR

AB

AN

NE

LC

AC

NS

DI

wo

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FfcMICS =

fctlGHT NORM

(100.0)

0.00

0.00

15.28

23.76

9.22

6.79

0.00

U.OO

0.00

27.63

0.00

0.00

2.28

11.82

0.00

.23

0.00

0.00

2.99

0.00

.58

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

15.53

14.61

9.37

12.06

0.00

0.00

0.00

29.16

0.00

0.00

16.00

0.00

0.00

.23

0.00

0.00

3.03

0.00

.30

L

ALK

K

MG

Tl

P

C/FM

OZ

13.6

# 2

.2

.2

1.3

.6

-41

3-COMPONENT

WT.PERCENTS

F 59.55

M 13.54

A 26.92

F 47.08

C 31.64

A 21.28

N 25.09

K 15.12

C 59.79
1066

TRACHYDOLtRlTE

14.55N 43.29E,

P. ROMAN. 192b

SI02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA2O

K?O

P2O5

H2O*

H2OCO2

SO3

TOTAL

0

C9

OR

AF?

AH

NE

LC

AC

NS

DI

WO

HY

OL

MT

H>"

IL

TI

RU

AP

cc

MCjO/MGO-fFiO

l.'i FENiICS =

ORIGINAL

ANALYSIS

48.00

0.00

16.48

10.15

2.40

3.22

2.55

11.42

4.20

1.13

0.00

1.19

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.74

WEIGHT NORM

(100.0)

0.00

0.00

6.72

29.6B

22.82

3.29

0.00

0.00

0.00

17.59

5.10

0.00

0.00

14.A1

0.00

U.00

0.00

0.00

0.00

0.00

.81

WATER-C02-FKEE

(100.0)

48.22

0.00

16.55

10.20

2.41

3.23

2.56

11.47

4.22

1.14

0.00

NON-OXIOAT ION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

6.85

15.36

23.27

11.43

0.00

0.00

0.00

30.11

0.00

0.00

12.97

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.25

SI

TI

AL

FE3

FE2

MN

Mb

CA

NA

K

P

H«

HC

s

0

ATOMS

WEIGHT

22.43

0.00

8.72

7.10

1.87

2.49

1.54

8.16

3.12

.94

0.00

.01

0.00

0.00

o.oo

44.37

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

ATOMS

NUMBERS (100.0)

17.92

0.00

7.25

2.8A

.75

1.02

1.42

4.57

3.04

.54

0.00

60.62

112

22.6

37.7

28.5

11.2

.15

• 23

0.0

0.00

.76

-33

3-COMPONENT

WT.PERCENTS

F 61.43

M 12.48

A 26.09

F 42.83

C 38.98

A 18.14

No. 1066

REMARKS: See under 1063. MnO ridiculously high.

MINERALOGY: Phenocrysts: An60, "isometric sanidine"

(nepheline?). Groundmass: An40, Mg-rich diopside,

chlorite, "sanidine. "

No. 1067

REMARKS: See under 1063.

MINERALOGY: Phenocrysts: An60-70. Groundmass:

An50-55; augite, partly "altered" to green hornblende;

chlorite, magnetite.

No. 1068

REMARKS: See under 1063.

MINERALOGY: Phenocrysts: An36. Groundmass: An20;

magnetite; rare quartz, calcite, white mica.

OTHER INFORMATION: Specific gravity 2. 672.
1067

TRACHyANuFSITfc

15.02N 43.35E,

0. ROHAN. 1926

WASAL. YEKEN

SI02

T102

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20+

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

49.38

.17

17.05

b.lfi

6.15

1.30

1.92

13.80

.97

1.42

.96

• 36

0.00

0.00

0.00

0.00

0.00

0.00

0.00

101.66

WATER-C02-FREE

(100.0)

48.75

.17

16.83

8.08

6.07

1.28

1.90

13.62

.96

1.40

.95

SI

TI

AL

Ft3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

23.07

.10

9.02

5.72

4.78

1.01

1.16

9.86

.72

1.18

.42

.00

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

18.25

.05

7.43

2.28

1.90

.41

1.06

5.47

.70

.67

.30

0

CB

OR

An

AN

NE

LC

AC

NS

01

WO

HY

OL

MT

HI

IL

TI

RU

AP

CC

MGO/MGO*FEO

IN FEMICS =

WEIGHT NORM

(100.0)

10.37

0.00

B.30

8.12

37.46

0.00

0.00

0.00

0.00

20.65

0.00

.99

0.00

11.73

0.00

.32

0.00

0.00

2.07

0.00

.48

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

1.88

0.00

8.43

8.24

38.05

0.00

0.00

0.00

0.00

21.79

0.00

19.18

0.00

0.00

0.00

.32

0.00

0.00

2.10

0.00

.20

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

02

117

23.9

36.4

35.3

4.4

.<,

.1

.3

.9

.9

-0

3-COMPONENT

WT.PERCENTS

F 76.88

M 10,30

A 12.82

F 46.95

C 45.22

A 7.83

8.77

85.74

1068

TRACHYANOESITE

15.03N 43.43E,

D. ROMAN, 1926

MANAKA, YEMEN

S102

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H2UC02

S03

TOTAL

ORIGINAL

ANALYSIS

55.95

0.00

13.52

12.20

.85

1.64

.71

6.17

2.79

4.23

1.13

.61

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.80

V.ATER-C02-FREE

(100.0)

56.41

0.00

13.63

12.30

.86

1.65

.72

6.22

2.81

4.26

1.14

SI

TI

AL

F£3

F£2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

26.14

0.00

7.15

8.53

.66

1.27

.43

4.41

2.07

3.51

.49

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

20.72

0.00

5.90

3.41

.26

.52

.39

2,45

2.00

2.00

.35

Q

C8

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H4

IL

TI

R'J

AP

CC

MGG/MGO+FLO

III FtMICS =

WHISHT NORM

(100.0)

14.71

0.00

25.26

23.85

11.91

0.00

U.00

0.00

0.00

3.85

3.07

0.00

0.00

8.18

6.AB

0.00

0,00

0,00

2.49

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

4.34

0.00

25.86

24.42

12.20

0.00

0.00

0.00

0.00

11.10

0.00

19.52

0.00

0.00

0.00

0.00

0.00

0.00

2.55

0.00

.09

FM

C

ALK

K

38

20

16

.2

.5

.7

• bO

3-COMPONENT

WT.PERCENTS

F 62.80

49.73

73.51

26.75

21.15

32.07

46.7R
1069

ALBITL-UUARTZ bOSTONITi

14.561-t 43.32E, HAJEUA,

D. ROMAN. 1926

CHUT8A, YEMEN

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

SOi

TOTAL

ANALYSIS

56.90

0.00

13.28

10.17

2.51

.98

.61

6.65

4.46

3.05

.12

• 71

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.44

*ATER-C02-FKEE

(100.0)

57.63

0.00

13.45

10.30

2.54

.99

.62

6.74

4.52

3.09

.12

51

TI

AL

FE3

Ft2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

26.58

0.00

7.03

7.11

1.95

.76

.37

4.75

3.31

2.53

.05

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

21.05

0.00

5.79

2. 84

.78

.31

.34

2.64

3.20

1.44

.04

0

C3

OR

AH

AN

KE

LC

AC

NS

01

woHY

OL

MT

H"A

IL

TI

RU

AP

CC

MGO/MGOtFEO

IN FLMICS =

WEIGHT NORM

(100.0)

9.82

0.00

1H.30

38.30

7.24

0.00

0.00

0.00

0.00

3.33

H.flfl

0.00

0.00

11.46

2.42

0.00

0.00

0.00

.27

0.00

1.00

NON-OXIDATION NORM

(FE203 CONVERTER TO FEO)

0.00

0.00

18.66

39.07

7.38

0.00

0.00

0.00

0.00

22.98

0.00

11.14

.50

0.00

0.00

0.00

0.00

0.00

.27

0.00

.08

NIGGLI

SI

AL

FM

C

AL<

K

MG

TI

P

C/FM

QZ

173

23.9

35.2

21.8

19.2

.3

.0

0.0

.1

.6

-3

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

60.96

2.93

36.11

47.24

?4.7R

27.9H

31.50

21.54

46.96

No. 1069

REMARKS: See under 1063.

MINERALOGY: Phenocrysts: An5-7 (3 mm length) with

inclusions of magnetite, apatite, mica. Groundmass:

Microlites of orthoclase (albite rims), green biotite,

magnetite, apatite, quartz.

OTHER INFORMATION: Specific gravity 2. 657. Sheet

intrusion.

No. 1070

REMARKS: See under 1063.

MINERALOGY: Phenocrysts: Zoned An50-70. Groundmass: Anl5 in trachytic texture; geodes containing

chlorite, calcite, chalcedony.

No. 1071

REMARKS: See under 1063.

MINERALOGY: Groundmass: Trachytic texture;

orthoclase with albitic rims; quartz, green biotite,

ilmenite, magnetite.

OTHER INFORMATION: Specific gravity 2. 740. Sheet

intrusion.
1070

TRACHYANDESITt

15.03N 43.43E,

D. ROMAN. 1926

MANAKA, YEMEN

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K2U

P2O5

H20*

H20-

C02

503

TOTAL

ORIGINAL

ANALYSIS

57.08

0.00

12.65

9.21

.30

1.04

3.76

5.49

5.92

3.46

.07

1.03

0.00

0.00

0.00

0.00

0.00

o.oo

0.00

100.01

WATER-C02-FREE

(100.0)

57.67

0.00

12.78

9.30

.30

1.05

3.80

5.55

5.98

3.50

.07

SI

Tl

AL

FE3

FE2

MM

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

26.67

0.00

6.69

6.44

.23

.81

2.27

3.92

4.39

2.87

.03

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

20.73

0.00

5.41

2.52

.09

.32

2.04

2.14

4.17

1.60

.02

0

CB

OR

Afi

AN

NE

LC

AC

N5

DI

MO

HY

OL

MT

HW

IL

TI

RU

AP

ccMGO/MGO-fFEO

IN FtMC S =

WEIGHT NORM

(100.0)

0.00

0.00

20.70

43.64

0.00

1.40

0.00

3.95

0.00

20.46

.37

0.00

0.00

4.42

4.91

0.00

0.00

0.00

.15

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

21.08

39.35

0.00

4.18

0.00

0.00

1.06

23.31

0.00

0.00

10.87

0.00

0.00

0.00

0.00

0.00

.16

0.00

.43

c

ALK

3-COMPONENT

WT.PERCENTS

F 41.99

M 16.60

A 41.41

F 39.01

C 22.52

A 38.47

N 39.81

K 23.27

C 36.9?

1071

OUARTZ BOSTONITt

14.54N 43.27E,

0. ROMAN, 1926

t L BIHAR, UirAL. YEMEN

SI02

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20 +

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

59.98

.09

14.42

9.94

2.47

.82

.59

1.11

4.13

5.72

.80

.69

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.76

V.ATER-C02-FREE

(100.0)

59.94

.09

14.41

9.93

2.47

.82

.59

1.11

4.13

5.72

.80

51

TI

AL

FL3

FE2

MN

Mii

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

28.0 2

.05

7.6 3

6.9 5

1.9 2

• 6 4

.36

.79

3.0 6

4.7 5

.35

.01

0.0 0

0.0 0

0.0 0

ATOM S

NUMBER S (100. 0

21.6 9

6

2

2

2

02

.15

71

75

25

32

43

90

64

24

0

CB

OR

Ars

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FE O

I N FEMIC S =

WEIGH T NOR M

(100.0)

12.65

1.11

33.86

35.00

.61

0.00

0.00

0.00

0.00

0.00

0.00

1.47

0.00

10.39

2.79

.17

0.00

0.00

1.75

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVEKTED TO FEO)

3.28

1.13

34.52

35.68

.82

0.00

0.00

0.00

0.00

0.00

0.00

22.62

0.00

0.00

0.00

.17

0.00

0.00

1.7B

0.00

.09

3-COMPONENT

WT.PERCENTS

54.31

53.10

4.75

42,15

37,6H

52.19

10.13
1072

ALBIT1C B0STOMTE

15.02fl 43.3bE. »|ASAL«

D. ROMANt 1926

5IU2

TI02

AL2O3

FF203

FED

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

64.50

0.00

15.08

5.64

.41

.80

.61

2.25

7.27

3.04

.65

.32

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.77

WATER-C02-FREE

64.21

0.00

15.01

5.61

.41

.80

.61

2.24

7.24

3.03

.85

(100.0)

SI

Tl

AL

Ft3

FE2

MN

M&

CA

NA

K

P

H*

HC

5

0

ATOMS

WEIGHT

30.13

0.00

7.98

3.94

.32

.62

.37

1.61

5.39

2.52

.37

.00

0.00

0.00

0.00

47.51

ATOMS

NUMBERS (100.0)

22.4H

0.00

6.19

1.48

.12

.24

.32

.84

4.91

1.35

.25

61.82

WEIGHT NOPM

b

0

17

60

(100.0)

.34

.00

.93

.35

NS

DI

WO

HY

OL

MT

H'1

IL

TI

RU

AP

CC

MGO/MGO*hcO

In FtMCS -

0.00

3.27

• B2

0.00

0.00

3.93

2.61

0.00

0.00

0.00

1.M5

0.00

l.on

NON-OXIDATION NORM

(FE203 CONvEHTED TO FEO)

3.91

o.oo

IB.12

61.00

0.00

0.00

0.00

o.oo

.24

5.44

o.oo

9.41

0.00

o.oo

0.00

0.00

0.00

o.oo

1.87

0.00

c

ALK

3-COMPONENT

hT.pERCENTS

F 35.65

M 3.59

A 60.75

32.51

12.09

55.40

57.88

24.20

17.91

No. 1072

REMARKS: See under 1063.

MINERALOGY: Phenocrysts: An5. Groundmass:

Fluidal, trachytic texture; anorthoclase?; some magnetite,

apatite, white mica, rare quartz.

OTHER INFORMATION: Specific gravity 2. 531.

No. 1073

REMARKS: See under 1063.

MINERALOGY: Phenocrysts: Anorthoclase rhombs with

inclusions of magnetite and muscovite. Groundmass:

Saccharoidal quartz and feldspar, some AnlO.

OTHER INFORMATION: Specific gravity 2. 538. Sheet

intrusion in comendite lavas.

No. 1074

REMARKS: See under 1063.

MINERALOGY: Groundmass: Devitrified to microfelsite

with some quartz.
1073

LARvUITE npANTELLERITE"

14.56U 43.32E. j. EL

D. ROMAN. 1926

EID. HAjELA, YEMEN

SI02

TI02

AL203

FEZ03

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20+

H20-

C02

S03

TOTAL

ORIGINAL

ANALYS15

70.08

.10

9.5R

7.22

.28

1.32

.48

1.26

6.15

2.24

.73

.40

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99. 84

WATER-C02-FHEE

(100.0)

70.47

.10

9.63

7.26

.28

1.33

.48

1.27

6.18

2.25

.73

SI

Tl

AL

FE3

FE2

MN

M&

CA

NA

K

P

H«

HC

5

ATOMS

WEIGHT

32.74

.06

5.07

5.05

.22

1.02

.29

.90

4.56

1.86

.32

.00

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

24.70

.03

3.9B

1.92

.08

.39

.25

.48

4.21

1.01

.22

0

CB

OR

AH

AN

NF

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MG0/M6O+FE0

IN FEMICS =

HEIGHT NORM

(100.0)

27.78

0.00

13.35

36.99

0.00

0.00

0.00

13.62

0.00

1.61

0.00

1.12

0.00

3.73

0.00

.19

0.00

0.00

1.61

0.00

.69

NON-OX I DAT I UN NORM

(FE2O3 CONVERTED TO FEO)

27.58

0.00

13.53

37.52

0.00

0.00

0.00

0.00

3.65

1.77

0.00

14.13

0.00

0.00

0.00

.19

0.00

0.00

1.63

0.00

.10

SI

AL

FM

C

ALK

319

25

34

6

33

C/FM

OZ

3-C0MP0NENT

WT.PERCENTS

F 45.82

43.73

7.35

48.92

63.73

23.21

13.06

1074

TRACHYTE UCOMENDITE -

15.23N 44.10E, SANA,

D. ROMAN. 1926

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20+

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

71.69

0.00

10.75

4.44

.44

.66

• 53

2.57

4.46

4.19

0.00

.88

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.81

WATER-C02-FREE

(100.0)

71.74

0.00

10.76

4.44

.44

.86

.53

2.57

4.46

4.19

0.00

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H»

HC

s

ATOMS

HEIGHT

33.49

0.00

5.69

3.11

.34

.67

.32

1.84

3.31

3.48

0.00

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.10

0.00

4.44

1.17

.13

.26

.78

.96

3.03

1.87

0.00

0

CR

OH

AS

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO-^ bO

IN FtKICb =

HEIGHT NOPM

(100.0)

27.26

0.00

24.84

31.95

0.00

0.00

0.00

5.21

0.00

3.27

3.61

0.00

0.00

3.P5

0.00

0.00

0.00

0.00

0.00

0.00

.89

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

25.50

0.00

25.06

32.22

0.00

0.00

0.00

0.00

1.39

11.27

0.00

4.57

0.00

0.00

0.00

0.00

0.00

o.oo 0.00

0.00

.16

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

335

29.7

24.5

12.9

32.il

.38

.15

0.0

0.00

.53

114

3-COMPONENT

WT.PERCENTS

F 34.71

M 3.77

A 61.52

F 30.31

C 15.96

A 53.73

N 39.75

K 37.34

C 22.91
1075

CCMFNblTE

14.56N 43.32E,

0. ROMAN, 1926

«ADI HAJELA,

5102

TIU2

AL203

FE2O3

FEO

MNC

MGO

CAO

NA20

K2U

P205

H20 +

H20-

C02

S03

GRItl.-.AL

ANALYSIS

73.07

.16

9.34

6.98

.37

.43

1.34

2.04

2.04

3.12

1.07

1.08

0.00

0.00

0.00

0.00

HATER-C02-FKEE

(100.0)

73

9

6

1

2

2

3

1

10

16

34

98

37

43

34

04

04

12

07

51

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

H+

HC

s

ATOMS

WEIGHT

34.14

.10

4.94

4.88

.29

.33

.81

1.46

1.51

2.59

.47

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.61

3

1

1

1

04

86

84

11

13

70

77

39

40

32

0

C3

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

M60/W00+FEG

IN FEMICS =

HEIGHT NORM

(100.0)

45.50

1.19

IS.50

17.31

3.85

0.00

0.00

0.00

0.00

0.00

0.00

3.35

0.00

2.14

5.52

.30

0.00

0.00

2.34

0.00

l.on

NON-OXIDATION NORM

(FE2O3 CONvEKTED TO FEO)

40.75

1.20

18.75

17.55

3.90

0.00

0.00

0.00

0.00

0.00

0.00

15.18

0.00

0.00

0.00

.31

0.00

0.00

2.37

0.00

.27

NIGGLI

51

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

372

28.1

40.5

11.2

20.3

.50

.25

.6

2.31

.28

191

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

D.I.

53.07

9.68

37.26

50.5?

14.07

35.46

28.33

43.33

28.33

84.58

No. 1075

REMARKS: See under 1063. This rock may be the host

to 1073.

MINERALOGY: Phenocrysts: Corroded quartz with

apatite inclusions, microperthitic orthoclase, An5.

Groundmass: Microfelsitic, rare iron-oxide.

OTHER INFORMATION: Specific gravity 2.585.

No. 1076

REMARKS: See under 1063.

MINERALOGY: Evidently transposed from another

specimen. Phenocrysts: An70-55. Groundmass:

Corroded K-feldspar crystals, quartz, chlorite,

magnetite, calcite, epidote.

OTHER INFORMATION: Specific gravity 2. 500.

No. 1077

REMARKS: See under 1063.

MINERALOGY: Phenocrysts: Anorthoclase (sericitised).

Groundmass: Devitrified, felsitic; some femics, no

quartz?.

OTHER INFORMATION: Specific gravity 2. 570.
1076

TRACHYDOLE.KITE acOMENDITE"

14.55N 43.30E, j. DAMER,

D. ROMAN, 1926

HAjELA, YEMEN

SIU2

TIO2

AL203

FE2O3

FEO

MNO

M6U

CAO

NA20

K20

P205

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

75.19

0.00

9.42

5.67

.22

.40

.39

.60

3.83

3.14

.27

.28

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.41

WATER-C02-FREE

(100.0)

75.85

0.00

9.50

5.72

.22

.40

.39

.61

3.86

3.17

.27

SI

TI

AL

F£3

FE2

MN

MS

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

35.13

0.00

4.98

3.97

.17

.31

.24

.43

2.84

2.61

.12

.00

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

26.32

0.00

3.89

l.SO

.06

.12

.20

.23

2.60

1.40

.08

0

CB

OR

API

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HW

IL

TI

RU

AP

CC

MGO/MGO«KEG

IN FLMICS =

WLIGHT NOPM

(100.0)

40.58

0.00

18.77

31.22

0.00

0.00

0.00

1.37

0.00

1.10

0.00

.47

0.00

2.04

3.86

0.00

0.00

0.00

.60

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

37.10

0.00

18.98

31.57

0.00

0.00

0.00

0.00

.37

1.25

0.00

10.13

0.00

0.00

0.00

0.00

0.00

0.00

.60

0.00

.12

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F 44.45

50.59

41.48

7.93

1077

HYALOTRACHYTE n

15.03N 43.43E,

D. ROMAN, 1926

b-ALKALllvjE RHYOLlTE*

ATTARA.MANAKA , YEMtN

SI02

TI02

AL2O3

FE203

FEO

MNO

MGO

CAU

NA2O

K2U

P2O5

H2O*

H2OCO2

SO3

TOTAL

ANALYSIS

77.12

.08

12.72

6.42

.89

1.02

.17

.93

.63

1.11

.09

.22

0.00

0.00

0.00

0.00

0.00

0.00

0.00

101.40

WATER-C02-FREE

(100.0)

76.22

.08

12.57

6.35

.88

1.01

.17

.92

.62

1.10

.09

SI

TI

AL

Ft3

Ft2

MN

Mb

CA

NA

K

P

ATOMS

WEIGHT

36.03

.05

6.73

4.49

.69

.79

.10

.66

.47

• 92

.04

ATOMS

NUMBERS (100.0)

26.47

.02

5.15

1.66

.26

.30

.09

.34

.42

.49

.03

0.00

0.00

0.00

0

csOR

AS

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

I rtFEMICS =

WEIGHT NORM

(100.0)

66.33

8.88

6.50

5.28

4.05

0.00

0.00

0.00

0.00

0.00

0.00

.42

0.00

5.91

2.28

.15

0.00

0.00

.19

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

61.23

8.99

6.58

5.35

4.10

0.00

0.00

0.00

0.00

0.00

0.00

13.41

0.00

0.00

0.00

.15

0.00

0.00

.20

0.00

.04

3-COMPONENT

WT.PERCENTS

F 79.28

M 1.84

A 18.87

F 73.25

23.60

41.57

34.83
1078

PANTELLtklTt

14.55H 43.35E.

0. ROMAN, 1926

».ADI kADIA, YEMEN

SIU2

TIU2

AL203

FE2O3

FED

MNO

MdO

CAU

NA20

K 2U

P2U5

H2U*

H20-

C02

S03

TOTAL

ORI&IMrtl

ANALYSIS

79.37

0.00

6.27

4.14

.60

.58

.40

2.57

3.02

3.65

O.CO

1.P9

0.00

0.00

0.00

0.00

0.00

0.00

0.00

101.69

WATER-C02-FREE

(100.0)

78

0

6

4

2

3

3

0

90

00

23

12

60

58

40

55

00

63

00

Si

TI

AL

FE.3

FL2

MN

MG

Ck

NA

K

P

H +

Hc

s

0

ATOMS

taEI&HT

37.08

0.00

3.32

2.90

.47

.45

. 2 *

1.84

2.24

3.03

0.00

.01

0.00

0.00

0.00

50.12

ATOMS

NUMBERS (100.0)

27.45

0.00

2.56

1.08

.17

.17

• ?1

.95

2.03

1.61

0.00

63.77

WLl&HT HC»M

(100.0)

46.24

0.00

21.50

11.8?

0.00

0.00

0.00

11. «4

.02

6.23

2.24

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

NON-OxIDATIUIl NORM

(FE2O3 CONvEhTED TO FEO)

48.49

0.00

21.67

11.91

0.00

0.00

0.00

0.00

3.20

11.23

0.00

3.50

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

uz

482

22.5

28.7

16.8

32.0

.44

.13

0.0

0.00

.59

283

3-COMPONENT

WT.PERCENTS

F 40.14

32.6H

39.50

27.81

No. 1078

REMARKS: See under 1063. Sub-aluminous.

MINERALOGY: Groundmass: Brown glass; microlites

quartz, An5-8, cossyrite(?).

No. 1079

MINERALOGY: Groundmass: Labradorite, titanaugite,

uncommon olivine, magnetite, some glass.

OTHER INFORMATION: Specific gravity 2.97.

No. 1080

MINERALOGY: Groundmass: Brown glass, An60, fresh

Fe-rich olivine; no augite.

OTHER INFORMATION: Specific gravity 2. 95.
1079

AlJGlTt-OLWINt tlASALT

03.50M 45.25E, SHFIK

P. AL0IS1, 1927

..Uf-E. eULO BLIKTI. SOMALI

SI02

TIU2

AL2O3

FE203

FEO

MMO

MGO

CAO

NA20

K20

P2O5

H2U+

H2UC02

S03

TOTAL

OKIC.INAi

ANALYSIS

46.64

3.P2

13.23

4.60

10.51

.19

5.96

10.17

2.58

.59

.47

1.30

.32

0.00

0.00

0.00

0.00

0.00

0.00

100.58

WATER-C02-FKLE

(100.0)

10.62

.19

6.02

10.28

2.61

.60

.47

SI

TI

AL

Ft3

FL2

MN

Mi,

CA

NA

K

P

H*

Hc

s

ATOMS

WEIGHT

21.79

2.29

7.00

3.36

8.17

.15

3.60

7.27

1.91

.49

.21

.02

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

17.65

1.09

5.90

1.37

3.33

.06

3.37

4.12

1.89

.29

.15

WEIGHT NORI*

(100.0)

• K6

0.00

3.53

22.10

22.9R

0.00

0.00

0.00

0.00

20.f.4

0.00

14.47

0.00

7.05

0.00

7.32

0.00

0.00

1.04

0.00

NON-OXIDATION NORM

(FE2O3 CONvFKTED TO FEO)

0.00

0.00

3.56

22.31

23.20

0.00

0.00

0.00

0.00

21.37

0.00

8.75

12.37

0.00

o.oo

7.39

0.00

0.00

1.05

0.00

3-COMPONENT

WT.PERCENTS

F 62.64

M 74.39

A 17.97

F 53.44

C 35.50

A 11.06

1080

OLIVINE BASALT

03.50N 42.25E,

P. ALOISI, 1927

SHEIK i,W!t. LULU BUHTI. SOMALI

SI02

TI02

AL2O3

FE2O3

FFO

MNO

MGU

CAU

NA20

K2U

P2U5

H20-

C02

S03

TOTAL

OKIGINA

AMALYS1

47.

3.

13.

4.

9.

;,.

9.

2.

.

•

*

,2

.8

.0

55

nB

)7

<4

79

.0

*

7

37

0.00

0.00

0.00

0.00

0.00

0.00

100. 13

k,ATER-C02-FKEE

(100.0)

13.56

5.02

9.90

SI

TI

AL

FL3

Ft2

MN

MG

CA

NA

ATOMS

HEIGHT

22.15

2.09

7.09

3.4b

7.59

.14

3.60

7.03

2.07

ATOMS

NUMBERS (100.0)

17.90

.99

5.96

1.41

3.09

.06

3.36

3.98

2.04

0.00

0.00

0

en

OR

AF)

AN

NF

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

WGU/MGO+FL'O

I . FE.MICS =:

HEI&HT NOrM

(100.0)

1.92

0.00

2.40

23.97

23.14

0.00

0.00

0.00

0.00

19.21

0.00

14.34

0.00

7.29

o.oo

b.fc9

0.00

0.00

1.04

0.00

.70

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

2.42

24.20

23.36

0.00

0.00

0.00

0.00

19.95

0.00

12.46

9.80

0.00

0.00

6.76

0.00

0.00

1.05

0.00

.50

112

18.6

49.5

24.9

7.0

.09

.47

3-C0nP0NENT

WT.PERCENTS

F 61.64

M 25.00

A 13.36

F 53.05

C 35.46

A 11.50

N 21.41

K 3.07

C 75.52
1 001

POTASbIC TRACHYT'-

08.56N 39.56E, S.l . :>ASE Or FANTALl. SHOA

L. DUPARC AND f. MOLLY, 1977A

SI02

TI02

AL203

FF.2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H20*

H20-

C02

S03

TOTAL

OKICJIMAI

ANALYSIS

64.84

.42

13.44

3.77

1.50

0.00

.21

1.04

2.R5

6.32

0.00

1.34

0.00

0.00

0.00

0.00

0.00

0.00

0.00

95.73

kATER~

68.69

.44

14.24

3.99

1.59

o.oo .22

1.10

3.02

6.70

0.00

C02—FREE

(100.0)

SI

TI

AL

Ft3

FL2

MN

MG

CA

NA

K

P

H*

HC

S

0

ATOMS

HEIGHT

30.29

.25

7.11

2.64

1.17

0.00

.13

.74

2.11

5.25

0.00

.02

0.00

0.00

0.00

46.02

ATOMS

NUMBERS (100.0)

24.18

.12

5.91

1.06

.47

0.00

.12

.42

2.06

3.01

0.00

62.66

MCiU/MGO + FEO

IH FtMICS =

WEIGHT NORM

(100.0)

22.64

0.00

39.68

25.61

5.45

0.00

0.00

0.00

0.00

.02

0.00

.55

0.00

3.65

1.35

.64

0.00

0.00

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

19.08

0.00

39.98

25.81

5.50

0.00

0.00

0.00

0.00

.02

0.00

8.75

0.00

0.00

0.00

.85

0.00

0.00

0.00

0.00

NIG&LI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

320

39.

21.

5.

33.

1.

0.

85

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

35.97

1.43

62.59

34.04

6.7?

59.24

77.91

61.90

10.19

No. 1081

REMARKS: Loss on heating 1.34%. The work of Lacroix

(1930) suggests that in this analysis the values for Na,O

and K2O have been transposed. The low summation

suggests an incomplete analysis or an error in one of

the oxide values.

MINERALOGY: Phenocrysts: Abundant, flow-aligned

alkali feldspar (2V = 43°); rare grey augite; crocidolite?.

Groundmass: Glass with microlite trains, crocidolite

with quartz rims.

OTHER INFORMATION: Specimen from large flow

reaching nearly to railway. Grey scoriaceous surface

to flow.

No. 1082

REMARKS: Loss on heating 2.40%.

MINERALOGY: Dark basaltic rock. Phenocrysts: Zoned

titanaugite, magnetite octahedra. Groundmass: Brown

glass with microlites of augite, magnetite, plagioclase.

No. 1083

REMARKS: No separate determination of H2O-.

MINERALOGY: Flow-texture. Phenocrysts: Andesine,

rare olivine with reaction rims. Groundmass: Feldspar,

augite, magnetite, ilmenite, rare glass.
1082

AuGITITE

09.00N 37.30E, KALL U STREAM,

L. DUPARC AND L. MOLLY, 19271:

F. OF GHEDO, SHOA

S102

TI02

AL203

FE2O3

FF.O

MNO

MGO

CAO

NA20

K20

P2O5

H20 +

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

42.04

4.18

13.66

6.43

9.51

0.00

S.98

11.33

2.53

2.46

0.00

2.40

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.52

WATER-C02-FREE

(100.0)

42.85

4.26

13.92

6.55

9.69

0.00

6.09

11.55

2.58

2.51

0.00

SI

TI

AL

FE3

FE2

MN

MCj

CA

NA

K

P

H+

HC

5

ATOMS

WEIGHT

19.64

2.51

7.23

4.50

7.39

0.00

3.61

8.10

1.88

2.04

0.00

.03

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

16.28

1.22

6.23

1.88

3.09

0.00

3.46

4.70

1.90

1.22

0.00

DI

WO

MGO/MGO+FEO

IN FLMC S =

HEIGHT NORM

(100.0)

0.00

0.00

14.84

3.80

18.96

9.78

0.00

0.00

0.00

30.85

0.00

0.00

4.17

9.52

0.00

8.08

0.00

0.00

0.00

0.00

NON-OXlDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

6.98

0.00

19.20

11.99

6.31

0.00

0.00

32.54

0.00

0.00

14.79

0.00

0.00

8.18

0.00

0.00

0.00

0.00

91

17.5

p

C/FM

OZ

0

-44

.00

.56

3-COMPONENT

V.T.PERCENTS

F 59.23

M 22.22

A 18.54

F 49.41

C 35.1?

A 15.47

N 15.50

K 15.07

C 69.4?

1083

ScORIACEOuS ANi.ESINE BASALT

13.39N 42.09E, uAHARASSOLl, ERITREA

P. C0MUCC1, 1928

EI02

TIU2

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

47.08

1.59

17.59

10.49

1.45

.27

4.11

9.85

2.72

1.83

• 23

2.72

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.93

wATER—

48.43

1.64

18.09

10.79

1.49

.28

4.23

10.13

2.80

1.88

.24

C02—FREE

(100.0)

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H+

HC

S

ATOMS

WEIGHT

22.00

.95

9.31

7.34

1.13

.21

2.48

7.04

2.02

1.52

.10

.03

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

17.77

.45

7.82

2.98

.46

.09

2.32

3.98

1.99

.88

.07

0

a

OR

Ad

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H

1*

IL

TI

RU

AP

CC

MGU/MGO+FEG

IN FEMICS =

whlCHT NORM

(100.0)

1.21

0.00

11.15

23.72

31.21

0.00

0.00

0.00

o.oo 13. R3

0.00

4.14

0.00

.99

10.13

3.10

0.00

0.00

.52

0.00

1.00

NON-OxIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

11.38

21.22

31.87

1.62

0.00

0.00

0.00

15.24

0.00

0.00

14.96

0.00

0.00

3.17

0.00

0.00

.53

0.00

SI

AL

FM

C

ALK

117

25.

38.

26.

9.

3-COMPONENT

WT.PERCENTS

F 57.96

M 19.95

A 22.09

F 45.33

C 37.40

A 17.27

N 18.89

K 12.71

C 66.40
1084

APHYR1C BASALT

13.10I-I 42.25E*

P. COMUCCI, 1920

dEILUL, ERITREA

SI02

TIU2

AL203

FE203

FEO

MNU

MGO

CAO

NA20

K20

P205

H20+

H20-

C02

SO 3

TOTAL

0

CB

OR

A3

AN

NE

LC

AC

NS

DI

WO

HY

OL

HT

HI

IL

TI

RU

AP

CC

OKJGIMAL

ANALYSIS

4d.84

3,00

11.00

13.12

4,06

.20

6.01

10.75

1.56

1.64

0.00

.23

0.00

0.00

0.00

o.oo 0.00

0.00

0.00

100.41

HtilGHT NORM

(KiO.O)

8.94

0.00

9.fc9

13.20

la.11

0.00

0.00

0.00

0.00

27.43

o.oo 2.26

0.00

5.07

9.63

5.68

O.OO

0.00

0.00

0.00

WATER-C02-FKEE

(100.0)

48.75

2.99

10.98

13.10

4.05

.20

6.00

10.73

1.56

1.64

0.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0,00

9.94

13.54

18.57

0.00

0.00

0.00

0.00

30.31

0.00

18.05

3.75

0.00

0.00

5.H3

0.00

0.00

o.oo

o.oo

SI

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

0

ATOMS

HEIGHT

22.82

L.80

5.82

>.18

9.16

.15

S.63

r.68

.16

.36

).00

.00

).00

>.oo 1.00

43.66

NIGGU

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

ATOMS

NUMBERS

18.33

.85

4.87

3.71

1.28

.06

3.37

4.33

1.14

.79

0.00

61.28

113

15.1

52.2

26.8

6.0

.41

.40

5.2

0.00

.->1

-10

(100.0)

3-COMPONENT

WT

N

K

C

D.I.

PERCENTS

65.10

22.77

12.13

55.19

34.53

10. ?B

ll.lfl

11.76

77.0A

74.0ft

IN FLr.ICS = l.OU

No. 1084

REMARKS: No separate determination of H2O-.

MINERALOGY: Groundmass: An57-60, red-brown

titanaugite, rare altered olivine, rare glass, abundant

magnetite.

No. 1085

REMARKS: Decarbonated with acetic acid prior to

analysis; the exceptionally high CaO in the remaining

rock suggests that contamination from the dissolved

calcite has occurred (see Hieke-Merlin, 1950). No

separate determination of HLO-.

MINERALOGY: Groundmass: Labradorite, augite,

altered Fe-rich olivine, dark glass; calcite-filled

vesicles up to 1 cm diameter; no zeolites.

OTHER INFORMATION: Calcitic scoria also occur on

the Asbol plain, 20 km from Assab. Manasse (1908)

also mentions the presence of calcitic rocks from this

region.

No. 1086

REMARKS: See important note under 1085.

MINERALOGY: Phenocrysts: Large fresh olivine.

Groundmass: Abundant glass with labradorite microlites.

OTHER INFORMATION: Weathers with iron-rich surface. Other specimens less rich in calcite vesicles

contain labradorite phenocrysts, with decomposed

olivine, rare augite and glass, and magnetite in the

groundmass.
1085

SCORIACfcOuS CALCITIC BASALT (DECARBONATED BEFORE ANAL.)

13.ION 42.25E, LjEILUL, ERITREA

P. COMUCCI. 1920

SI02

TI02

ALZ03

FE2O3

FEO

MNO

M30

CAu

NA20

K2J

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

49.05

1.65

a. 50

10.80

5.45

.16

5.IB

16.70

1.70

.78

0.00

1.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.99

WATER-C02-FREE

uoo.oi

49.05

1.65

8.50

10.80

5.45

.18

5.18

16.70

1.70

.78

0.00

SI

TI

AL

FE3

FE2

MN

Mi

CA

NA

K

P

H«

HC

S

ATOMS

hEI&HT

22.92

.99

4.50

7.55

4.24

.14

3.12

11.94

1.26

.65

0.00

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

IB.61

.47

3.80

3.09

1.73

.06

2.93

6.79

1.25

.3b

0.00

0

era

OR

AR

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MG0/MGO*FEO

IN FEMC S =

WEIGHT NORM

(100.0)

7.56

0.00

4.62

14.41

13.23

0.00

0.00

0.00

0.00

27.89

14.18

0.00

0.00

13.41

1.57

3.13

0.00

0.00

0.00

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

4.72

11.35

13.51

1.82

0.00

0.00

0.00

60.17

0.00

0.00

5.24

0.00

0.00

3.20

0.00

0.00

o.oo

0.00

.42

SI

AL

FM

C

ALK

107

11

45

39

4

3-COMPONENT

WT.PERCENTS

F 67.96

M 71.66

A 10.37

F 45.H7

C 47.14

A 7.00

N 8.86

K 4.07

C 87.07

1066

OLIVINE BASALT (OECARRONATEu bEFORE ANALYSIS)

13.1011 42.25E, HEILUL, ERITREA

P. COMUCCI. 192b

SI02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAU

NA20

K20

P205

H2U*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

49. 28

.33

U.10

b.oe

5.61

.32

6.8H

1?.55

ueo 1.03

0.00

1.75

0.00

0.00

0.00

0.00

0.00

0.00

o.oo

100.73

WATER-C02-FRLE

(100.0)

49.79

.33

8.18

8.16

5.67

.32

6.95

17.73

1.82

1.04

0.00

SI

TI

AL

FE3

Ffc2

MN

M£j

CA

NA

K

P

H+

HC

S

ATOMS

WEIGHT

23.02

.20

4.29

5.65

4.36

.25

4.15

12.54

1.34

.86

0.00

.02

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

18.73

.09

3.63

2.31

1.79

.10

3.90

7.15

1.33

.50

o.oo

0

CI3

OR

AB

AN

NE

LC

AC

NS

DI

wo

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO-fFEO

IN FELhICS =

HEIGHT NORM

(100.0)

1.63

0.00

6.16

15.41

11.06

0.00

0.00

0.00

0.00

44.42

8.83

0.00

0.00

11.86

0.00

.63

0.00

O.CO

0.00

0.00

.86

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

6.26

4.65

11.24

5.96

0.00

0.00

0.00

65.36

0.00

0.00

5.89

0.00

0.00

.64

0.00

0.00

0.00

0.00

.50

104

10.

TI

P

C/FM

OZ

.5

0,00

.88

-16

3-COMPONENT

WT.PERCENTS

F 58.50

M 29.40

A 12.09

F 40.18

C 51.51

A 8.31

N 8.83

K 5.05

C 86.11
10S7

OLlVlnlE HA SALT

13.00N 42.42E,

P. C0MUCC1, 192 8

.-IT. SU.LA, A5SA.

SI02

TI02

AL2O3

FE203

FEu

MNO

MGU

CAO

NA2O

K2U

P2U5

H2U*

H2OCO2

SO3

TOTAL

OKlfelrSAL

ANALYSIS

49.26

1.83

14.36

6.38

B.16

.57

5.46

10.56

1.67

.58

0.00

2.11

0.00

0.00

O.no

0.00

0.00

0.00

0.00

100.96

TEK—C02—FkfcE

(100.0)

.85

.65

.53

.45

.25

.58

.52

.68

.69

.59

.00

51

TI

AL

FL3

FE2

MN

Mo

CA

NA

K

P

H +

HC

S

ATOMS

WEIGHT

23.02

1.10

7.60

4.46

6.34

.44

3.29

7.55

1.24

.48

0.00

.03

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

18.52

.52

6.36

1.81

2.57

.18

3.06

4.26

1.22

.28

0.00

0

c^

cm

AP

AN

NE

LC

AC

NS

DI

wo

HY

OL

MT

Hy

IL

TI

RU

AP

CC

fttlCHT H0°h

(100.01

7.P4

0.00

3.47

14.32

30.30

0.00

0.00

0.00

0.00

IB.54

0.00

12.63

0.00

9.38

0.00

3.51

0.00

0.00

0.00

0.00

NON-OXlDATION NONM

(FE203 CONVEKTED TO FEO)

1.04

0.00

3.52

14.50

30.68

0.00

0.00

0.00

0.00

19.44

0.00

27.27

o.oo 0.00

0.00

3.56

0.00

0.00

0.00

0.00

MGO/MGOthtO

IN FEMCS =

117

20

3-COMPONENT

wT.PERCENTS

F

M

A

F

C

65

74

10

53

38

.35

.54

.11

.16

.61

No. 1087

REMARKS: See under 1085.

MINERALOGY: Very fresh rock. Phenocrysts: Yellowgreen olivine. Groundmass: Flow-texture; glass,

labradorite, magnetite, calcite (primary?); no pyroxene.

OTHER INFORMATION: See under 1001.

No. 1088

REMARKS: No separate determination of H-O-.

MINERALOGY: Groundmass: Andesine-labradorite,

augite, magnetite-ilmenite more abundant than in 1083,

rare glass.

No. 1089

REMARKS: No separate determination of H^O-.

MINERALOGY: Phenocrysts: Labradorite-bytownite.

Groundmass: Pale-brown glass, abundant magnetite

and ilmenite?; rather uncommon plagioclase microlites,

brown augite, scarce altered olivine.

OTHER INFORMATION: Olivine-andesine trachybasalt

from Dadda-ho contains ca. 61% SiO_; vetrose olivine

basalts reported from Foroddu (with calcite scoria),

Ela, Ulului, Doctummo (with calcite scoria); olivine

basalts reported from Dubbi, Addula, Dioita.
1088

APHYR1C BASALT

P. C0MUCC1. 1928

AHARASSOLI. ERITREA

SI 02

TI02

AL2O3

FE2O3

FEU

MNU

MGO

CAO

NA20

K 2 0

P2O5

H20*

H20-

C 0 2

S O i

TOTAL

ORICiIMAl

AUALYSI;

49.95

1.35

12.95

7.53

7.41

. 3 0

5.54

11.1?

2.06

1.15

0.00

1.45

o.co

0.00

U.00

0.00

0.00

0.00

0.00

loo.ei

WATER-C02-FREE

(100.0)

50.27

1.36

13.03

7.58

7.46

.30

5.58

11.19

2.07

1.16

0.00

SI

Tl

AL

F L 3

Ffc2

MN

MG

CA

NA

K

P

H +

H -

C

S

ATOMS

•.EIGHT

23.34

. 8 1

6.85

5.27

5.76

. 2 3

3.34

7.95

1.53

. 9 5

0.00

. 0 2

0.00

0.00

0.00

ATOMS

NUMBERS (100.0 )

18.71

. 3 8

5.72

2.13

2.33

. 1 0

3.10

4.47

1.50

. 5 5

0.00

0

en

OR

A H

AN

NE

LC

AC

NS

D I

WO

HY

OL

MT

HV

I L

T I

RU

AP

C.

MGU/MGO+FtO

IN FE'IKS =

FLIGHT NOKM

(100.0)

5.78

0.00

6.85

17.57

22.si

0.00

0.00

0.00

0.00

26.45

0.00

6.94

0.00

11.PI

0.00

2.5a

0.00

o.nn

0.00

0.00

.7ft

NON-OXlDATION NORM

((-E2O3 CONVEKTEl) TO FEO)

0.00

0.00

6.95

17.83

23.14

0.00

0.00

0.00

0.00

28.05

0.00

14. b2

6.59

0.00

0.00

2.62

0.00

0.00

0.00

0.00

. 4 4

117

17.9

3-C0MP0NENT

WT.PERCtNTS

F

M

A

F

C

A

N

K

C

63.0b

23.39

13.55

51.04

37.99

10.97

14. 3H

8.03

77.60

1089

PORPHYRITlC SASA, T

13.34N 41.05E, GHtLELI VOLCANO,

P. COMUCCI, 19k;H

N. CF L. JULI^UI

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K 2 o

P2U5

H20 +

H20-

CO2

SOJ

TOTAL

ANALYSIS

51.95

i.12

14.12

b.52

10.23

. 3 5

4.68

9.22

1.47

. 4 9

0.00

. 5 2

0.00

0.00

0.00

0.00

0.00

0.00

0.00

10U.B7

51.77

2.11

14.07

5.50

10.19

.35

4.86

9.19

1.46

.49

0.00

S I

T l

AL

FE3

F t 2

MN

M&

CA

NA

K

P

H *

H -

C

S

ATOMS

hEIGHT

24.27

1.27

7.47

3.86

7.95

• 27

2.94

6.59

1.09

. 4 1

0.00

. 0 1

0.00

0.00

0.00

ATOMS

NUMBERS (100.0 )

19.23

. 5 9

6.16

1.54

3.17

. 1 1

2.70

3.66

1.06

. 7 3

0.00

0

a

OR

A3

AN

NE

LC

AC

NS

D I

WO

HY

OL

MT

HM

I L

T I

RU

AP

CC

MGO/MGO+FEU

IN FtCICS =

t,ElCHT NORM

(100.0)

12.43

o.no

i.89

12.42

30.36

0.00

0.00

0.00

0.00

12.65

0.00

17.25

0.00

7.99

0.00

4.C1

0.00

0.00

O.CO

0.00

. 5 8

NON-OX IDATION NORM

(FE2O3 CONVFIUEO TO FEO)

6.69

0.00

2.92

12.55

30.68

0.00

0.00

0.00

0.00

13.11

0.00

29.99

0.00

0.00

0.00

4.05

0.00

0.00

0.00

0.00

. 4 0

129

20.7

4.0

0.00

.49

3-COMPONENT

WT.PtRCENTS

F 69.72

M 21.60

A 8.68

F 58.48

C 34.74

A 7.2H

N 13.15

K 4.3H

C 8?.47
1090

SCORIACEUUS HYALO-TRACHVIT

13.3811 42.07E. |',AhARA5S0LI ,ATl£kH0L£. ERITREA

P. COhUCCI, 19^8

SI02

TI02

AL2O3

FC2O3

FEO

MNU

MGO

CAU

NA2O

P2O5

H2u*

H2OCO2

SO3

Oh Id'M L

ANALYSIS

59.60

1.19

15.82

4.93

3.C5

1.02

l.Ofl

5.05

3.36

.29

1.17

0.00

0.00

0.00

I.ATER-C02-FREE

(100.0)

59.72

1.19

15.85

4.94

3.06

1.02

l.oa

5.06

3.37

4.42

SI

TJ

AL

Ft3

FL2

IN

Mo

CA

NA

K

ATOMS

HEIGHT

2 7 .

a.

3.

2 .

3 .

2 .

3 .

85

7 1

3 7

4 5

3 7

7 9

6 5

6 1

4 9

6 6

ATOMS

NUMBERS (100. 0

21.47

. 3 ?

6.72

1.34

. 9 2

. 3 1

. 5 8

1.9S

2.35

2.03

0

c

n

.

OR

AB

AM

NF

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RJ

AP

CC

Irt Hi H.

khlfHT i\Of.M

1100.0)

12.49

0.00

26.IB

2b.55

1 b • 0 3

0.00

0.00

0.00

0.00

6.H3

0.00

• H5

0.00

r.m

0.00

2.26

0.00

0.00

• f>4

o.no

.5 = .71

NON-OXIDATIOM NORM

(KE2O3 CO/NVFKTEI) TO FEO)

7.33

0.00

26.43

28.82

15.17

0.00

0.00

0.00

0.00

7.37

0.00

11.95

0.00

0.00

0.00

2.28

0.00

0.00

. 6 4

0.00

. 2 2

MGGLI

SI

AL

F-M

C

ALK

K

MG

T I

P

C/FM

OZ

2 0 1

31.5

29.6

18.3

20.6

. 4

. 1

3.0

. 4

. 6

19

3-COMPOKENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

47.42

6.42

46.17

38.37

24.2H

37.36

26.21

34.40

39.39

No. 1090

REMARKS: No separate determination of H_O-; notably

rich in manganese and potassium.

MINERALOGY: Groundmass: Brown glass with plagioclase

and rare augite microlites.

No. 1091

REMARKS: No separate determination of FeO or H^O-.

MINERALOGY: Groundmass: Glass with elongated

vesicles; signs of incipient crystallisation.

No. 1092

REMARKS: No separate determinations of FeO or H-jO;

too many terminal zeros in analysis, and summation is

low.

MINERALOGY: Groundmass: Glass with rare microlites.

OTHER INFORMATION: An alkaline rhyolite scoria from

SW of Dubbi contained ca. 70% SiO£ and was composed

of glass with corroded sanidine and aegirine-augite.
1091

PHY0L1T1C PUMICE.

13.ION 42.25E,

P. COMUCCI, 1920

bElHIL. ERITREA

SIU2

TI02

AL2O3

FE2O3

FEO

MNO

MOO

CAG

NA20

K20

P205

H20«

H20-

C02

503

TOTAL

OKIGINAL

ANALYSIS

69.55

0.00

10.91

4.84

0.00

0.00

.45

2.79

3.78

3.05

0.00

4.70

0.00

0.00

U.00

0.00

0.00

0.00

o.oo

100.07

wATER-C02-FhEE

(100.0)

72.93

0.00

11.44

5.07

0.00

0.00

SI

TI

AL

Ft3

Ft2

MN

MG

CA

NA

K

P

H*

HC

5

ATOMS

wEIGHT

32.49

0.00

5.77

3.39

0.00

0.00

.27

1.99

2. BO

2.53

0.00

.06

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.35

0.00

4.69

1.33

0.00

0.00

.24

1.09

2.67

1.42

0.00

DI

wo

HEIGHT NOHM

(1OO.O)

3^.79

0.00

lb.95

33.62

3.92

0.00

0.00

0.00

0.00

2.54

3.08

0.00

O.CO

0.00

5.09

0.00

0.00

0.00

0.00

0.00

III FEMCS = 1.00

NON-OX IDATION NORM

(FE2O3 CONVERTED TO FEO)

29.63

0.00

19.14

33.95

3.96

0.00

0.00

0.00

0.00

9.37

0.00

3.95

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.17

3-COMPONENT

WT.PERCENTS

F 39.93

M 3.71

A 56.35

F 33.47

1092

RHYOLITE Or>ML>IAr>

13.2ON 41.40E,

P. COMUCCI, 1928

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ANALYSIS

69.73

0.00

13.67

5.00

0.00

0.00

• 28

1.50

4.00

3.95

0.00

.50

0.00

0.00

0.00

o.no

o.oo

0.00

0.00

98.B3

KATER-C02-FREE

(100.0)

14.11

5. 08

0.00

1.53

4.07

SI

TI

AL

Ft3

Ft2

MN

M&

CA

NA

K

P

H*

HC

S

ATOMS

HEIGHT

32.58

0.00

7.34

3.50

0.00

0.00

.17

1.07

2.97

3.28

0.00

.01

0.00

0.00

0.00

ATUMS

NUMBERS 1100.0)

24.64

0.00

5.78

1.33

0.00

0.00

.15

.57

2.74

1.78

0.00

wLlGHT UOPC.

(100.0)

28.02

.26

23.81

34.51

7.59

0.00

0.00

0.00

0.00

0.00

0.00

.71

0.00

0,00

5.10

0,00

0.00

0,00

o.no

0.00

NON-OXIDATION NORM

(FE2O3 COWEKTE D TO FEO)

24.81

.27

24.04

34.85

7.66

0.00

0.00

0.00

0.00

0.00

0.00

8.37

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

SI

AL

FM

c

ALK

K

MG

TI

P

C/FK

UZ

342

40.1

20.6

7.9

31.5

.39

.10

0.0

0.00

.38

116

3-tOMPONENT

WT.PERCENTS

F 37.79

34.60

10.3ft

55.02

42.33

41.80

15.87

MGO/MGOtl-LU

lA FEMC5 =
1093

*K£NYITE« )Yft

0H.53N 37.03E, .iT.rO

L . DUPARC Mb L . hOLLY 1-/28A

WEAK -ilLLO, *OLLE.t>A

SI02

TI02

AL2O3

FE2O3

FEU

MNO

MGO

CAO

NA^U

K2O

P2O5

H2O*

H2OC02

S03

TOTAL

AUALYSli

53.77

.57

21.47

3.54

1.80

0.00

.78

2.1b

H.03

4.24

.14

3.67

0.00

0.00

0.00

O.UO

0.00

0.00

0.00

100.16

55.73

.59

22.25

3.67

1.87

0.00

.Ul

2.23

8.32

4.39

.15

SI

TI

AL

Ffc.3

Ft2

MN

Mfa

CA

NA

K

P

H*

Hc

s

ATOMS

HEIGHT

25.12

.34

11.36

2.48

1.40

0.00

.47

1.54

5.96

3.52

.06

.04

0.00

0.00

0.00

ATOMS

NUMHEHS (100.0

19

9

0

5

1

58

16

22

97

55

00

42

84

67

97

04

0

C"

OR

AD

AN

NE

LC

AC

N5

01

WO

HY

OL

MT

HH

It

TI

RU

AP

CC

MGO/MGOtFEO

IN FEM1CS =

VILIGHT MOKM

(100.01

0.00

• 02

26.03

3M.44

10.23

17.41

0.00

0.00

0.00

0.00

0.00

0.00

L.41

4.32

.70

1.12

0.00

0.00

.32

0.00

1.00

NOM-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

.02

26.22

34.75

10.30

19.68

0.00

0.00

0.00

0.00

0.00

0.00

7.59

0.00

0.00

1.13

0.00

0.00

.32

0.00

.25

NIQbLl

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

UZ

174

41.

17.

34.

1.

-62

3-COMPONENT

WT.PERCENTS

F 79.04

H 4.24

A 66.72

F 27.02

C 10.88

A 62.10

N 55.69

K 29.40

C 14.91

No. 1093

REMARKS: MnO trace. Loss on heating, 3.67%;

published summation of 100.02%.

MINERALOGY: Phenocrysts: Very corroded anorthoclase, up to Z cm length. Groundmass: Glass with

anorthoclase and femic microlites; rare apatite,

magnetite, hornblende, no nepheline(?).

OTHER INFORMATION: Occurs as large dyke.

No. 1094

REMARKS: Loss on heating, 1.96%.

MINERALOGY: Phenocrysts: Very abundant; large

titanaugite; olivine, magnetite octahedra, scarce

plagioclase which is younger than the other phenocrysts.

Groundmass: Augite, magnetite, rare biotite, An56,

no glass.

No. 1095

MINERALOGY: Compact dark rock. Groundmass: Fresh

brown glass, andesine-labradorite microlites, some

decomposed femics?.
1094

*TOKE1TE# oAUGlTF-ULlVlUE ^,ASALT»

08.4fliM 37.42t . L. ARfcTE MT . TUKAy,

L. DUPARC AND k, MOLLY, 19281

UPPER GUUER VALLEY , SriOA

S102

T1O2

AL203

FE2O3

FEU

MNO

MGO

CAO

NA20

K 2 0

P2U5

H20*

H20-

C02

S 0 3

TOTAL

ORI&IMAi.

ANALYSIS

43.60

Z.22

10.65

3.53

7.15

0.00

12.62

17.42

1.30

. 5 5

0.00

1.96

0.00

0.00

0.00

0.00

0.00

0.00

0.00

101.00

i»ATER-C02-FHEE

(100.0)

44.02

2.24

10.75

3.56

7.22

0.00

12.74

17.59

1.31

.56

0.00

SI

Tl

AL

FL3

Ft2

MN

Mt>

CA

Hh

K

P

H»

H -

C

5

ATOMS

WEIGHT

20.37

1.33

5.63

2.47

5.56

0.00

7.61

12.45

. 9 6

. 4 6

0.00

. 0 2

0.00

0.00

0.00

ATOMS

NUMBERS (100.0 )

16.40

• f>3

4.7?

1.00

2.25

0.00

7.09

7.02

. 9 5

. 2 6

0.00

NORM 5102 LEFIC1T -I.h9

0

CF)

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO-ff-LO

IIM F-EMCS =

w£l&HT NORM

(100.0)

0.00

0.00

0.00

U.OO

il.78

6.03

2.58

0.00

0.00

52.11

0.00

0.00

9.78

5.IB

0.00

4.25

0.00

o.uo

0.00

0.00

.at

-3.55

NON-OX I DAT I UN NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

0.00

0.00

21.93

6.07

2.60

0.00

0.00

53.41

0.00

0.00

15.33

0.00

0.00

4.28

0.00

0.00

0.00

0.00

.74

3-COMPONENT

WT.PEHCENTS

F 42.47

M 50.1H

A 7.3b

F 35.66

C SS.16

2.85

90.40

1095

APHYUIC BASALT

15.23IM 44.0S(E,

P. C0MUCC1. 1930

5102

T1U2

AL2O3

FE2O3

FEO

MNO

M30

CAO

NA20

K 2 0

P2O5

H20 +

H20-

cot

5 0 3

TOTAL

OI<I£INAL

A11ALYSIS

50.30

3.18

15.93

4.24

9.25

. 1 3

3.64

7.92

2.39

1.25

0.00

. 9 5

. 9 0

0.00

0.00

0.00

0.00

0.00

0.00

100.08

51.21

3.24

16.22

4.32

9.42

.13

3.71

8.06

2.43

1.27

0.00

SI

TI

AL

FL3

Ft2

MN

MG

CA

NA

P

H»

HC

s

ATOMS

fttlGHT

23.50

1.91

8.43

2.97

7.19

. 1 0

2.20

5.66

1.77

1.04

0.00

. 0 1

. 0 1

0.00

0.00

ATOMS

NUl-ihEtfb (100.0 )

IB.9 0

. 9 0

7.06

1.20

2.91

. 0 4

2.04

3.19

1.74

. 6 0

0.00

0

CB

OR

AH

AN

NE

LC

AC

NS

Dl

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGU/MGO*FtO

IN FLK'ICS =

KtlGHT NOPM

1100.0)

7.!>7

0.00

7.54

20.63

29.54

0.00

0.00

0.00

0.00

8.71

0.00

13.60

0.00

6.27

0.00

6.14

0.00

0.00

. 0.00

0.00

. 5 8

NON-OXIDATION NORM

(FE2O3 CONVFKTED TO FEO)

3.03

0.00

7.60

20.80

29.79

0.00

0.00

0.00

0.00

9.01

0.00

23.57

0.00

0.00

0.00

6.20

0.00

0.00

0.00

0.00

. 3 9

S I

AL

FM

C

ALK

K

MG

T I

P

C/FW

CJZ

1 3 4

25.0

44. u

22. /

8 . 3

. 3 3

6 . 4

0.00

. 5 2

1

3-COMPONENT

WT.PERCENTS

F h4.95

M 17.53

A 17.53

F 53.85

C 31.62

A 14.53

N ?0.67

K 10.81

C 68.51
1096

ALKALI TRACHYTE

15.23N 44.15E.

P. COMUCCI. 1930

10KM E. OK SAN»A, YEMEN

SI02

TI02

AL2O3

FE203

FEO

UNU

M50

CAO

NA20

K20

P2O5

H?0*

H2UC02

S03

TOTAL

ORIGINAL

ANALYSIS

68.30

.42

11.88

2.61

1.88

.54

.80

2.20

2.94

b.Ol

0.00

2.74

1.31

0.00

0.00

0.00

0.00

0.00

0.00

100.63

wATER-C02-Fk£E

(100.0)

70.72

.43

12.30

2.70

1.95

.56

.83

2.28

3.04

5.19

0.00

SI

Tl

AL

FL3

FL2

MM

M0>

CA

NA

K

P

H+

HC

S

0

ATOMS

wEI&HT

31.91

.25

6.29

1.83

1.46

.42

.48

1.57

2.18

4.16

0.00

.03

.02

0.00

0.00

50.03

ATUMS

NUMBERS (100.0)

2 4. Rl

.11

5.09

.71

.57

.17

.43

• H6

2.07

2.32

0.00

6 2 . 85

0

CR

OR

AR

AN

NF

LC

AC

NS

DI

MO

HY

OL

MT

H *

IL

TI

P'l

A i'

CC

WGO/MGO»i ! 0

IH FEMCb =

K£lbHT NORM

(100.0)

27.58

0.00

30.74

25.82

4.52

0.00

0.00

0.00

0.00

5.60

0.00

.09

0.00

3.93

0.00

.83

0.00

0.00

0.00

0.00

.62

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

24.86

0.00

30.90

25.96

4.54

0.00

0.00

0.00

0.00

5.91

0.00

7.01

0.00

0.00

0.00

.83

0.00

0.00

0.00

0.00

.26

c

ALK

331

34

25

3-COMPONENT

WT.PEHCENTS

F

M

A

F

C

A

N

K

C

33.91

6.04

60.05

30.67

15.03

54.30

28.97

49.36

71.67

No. 1096

MINERALOGY: Phenocrysts: Corroded anorthoclase.

Groundmass: Anorthoclase, possible orthocalse, ra"re

plagioclase, aegirine-augite, brown glass, no quartz

or cossyrite.

OTHER INFORMATION: Specific gravity 2. 577. Also

from the San'a Valley: vitric sanidine rhyolite contains

77.32% Si©2, Na-plagioclase and augite rock contains

58.90% SiO2.

No. 1097

REMARKS: In Duparc (1930a, b) there are no separate

water determinations, only loss on heating.

MINERALOGY: Phenocrysts: Olivine, rare augite.

Groundmass: Labradorite, magnetite, augite, scarce

olivine, common glass.

OTHER INFORMATION: Dyke cuts birbirite near Yubdo.

No. 1098

REMARKS: See under 1097.

MINERALOGY: Phenocrysts: Olivine, magnetite, rare

augite. Groundmass: Gray augite, magnetite, microlites

of labradorite, rare olivine.
1097

OLlVlNE BASALT jyKL (IN EASE.*! NT ULTRAoASICS)

08.57(1 35.26E. YUPPO, WCLLtGA

L. DUPARC. 19 30*

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OC02

SO3

TOTAL

ANALYSIS

42.47

3.25

14.45

3.55

9.48

.79

9.42

10.40

2.65

2.00

0.00

1.40

o.oo

o.oo

0.00

0.00

0.00

0.00

0.00

99.86

«ATER-C02-Fl<EE

UOO.O)

43.13

3.30

14.66

3.61

9.63

.80

9.57

10.56

2.69

SI

Tl

AL

Ft3

FE2

MN

Mb

CA

NA

K

P

H+

HC

s

ATOMS

WEIGHT

19.84

1.95

7.65

2.48

7.37

.61

5.6H

7.43

1.97

1.66

0.00

.02

0.00

0.00

0.00

ATOKS

NUMBERS 1100.0)

16.13

.93

6.47

1.02

3.02

.25

5.34

4.23

1.95

• 97

0.00

0

en

OR

An

AN

NE

LC

AC

NS

DI

wn

HY

OL

MT

HM

1L

TI

RU

AP

CC

MGO/MGO+KEO

IN FEMCS =

KEI&HT NO^K

(100.0)

o.no

0.00

12.03

2.36

21.92

11.OB

0.00

0.00

0.00

24.69

0.00

0.00

16.43

5.24

0.00

6.26

0.00

0.00

0.00

0.00

.74

NON-OXIDATION NORM

OE203 CONVERTED TO FEO)

0.00

0.00

8.27

0.00

22.07

12.44

3.01

0.00

0.00

25.29

0.00

0.00

22.61

o.oo

0.00

6.30

0.00

0.00

0.00

0.00

.62

SI

AL

FM

C

ALK

<

MS

TI

P

C/FM

QZ

87

17.4

51.9

22.a

7.9

.33

.55

5.0

0.00

.44

-45

3-COMPONENT

WT.PtRCENTS

F 48.08

M 34.76

A 17.16

F 46.40

C 37.04

A 16.56

13.29

69.10

1098

OLlVlNE bASALT

09.03N 36.16E,

L. DUPARCi 1930A

STREA*, E. OF DIOESSA BRIDoU wOLLEGA

SIU2

TIU2

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOIAL

OHI&IMAi.

ANALYSIS

44.29

2.51

14.76

6.36

6.12

.43

9.12

11.74

2.07

1.16

.49

1.30

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.35

WATER-C02-FREE

(100.0)

44.71

2.53

14.90

6.42

6.13

.43

9.21

11.85

2.09

1.17

.49

SI

TI

AL

Ft3

Ft2

MN

MCi

CA

NA

K.

P

H +

HC

s

ATOMS

WEIGHT

20.69

1.50

7.81

4.45

4.76

.33

5.50

8.39

1.54

.96

.21

.02

0.00

0.00

0.00

ATOMS

NUMBEKS 1100.0)

16.57

.71

6.51

1.79

1.42

.14

5.09

4.71

1.50

.55

.16

HEIGHT '10MM

(100.0)

0.00

0.00

6.93

16.30

27.79

.77

0.00

o.oo

o.oo

22.23

o.oo

o.oo

10.77

9.33

0.00

4. el

0.00

0.00

1.08

0.00

NON-OXIDATION NORM

(f-E2O3 CONVERTED TO FEO)

0.00

0.00

7.02

9.02

2B.13

4.83

O.OO

0.00

0.00

23.43

o.oo

o.oo

21.61

o.oo

o.oo

4.87

0.00

0.00

I.10

0.00

5.7

.27

3-COMPONENT

wT.PERCENTS

F 50.2h

M 36.7?

A 13.01

F 45.4f>

C 42.77

A 11.77

N 13.83

K 7.75

C 78.4?

IN FEMCb =
1099

rAbALT

OB.54(1 37.00E,

L. DUPARC, lSCi

bODDO rOL, L. OF ;(AMA PIvER, wOLLEdA

Slu2

TI02

AL203

FE2Q3

FCO

MNO

MGO

CAU

NA2O

K2O

P2O5

H2U*

H2OCO2

SO3

TOTAL

AhALYSI

44.99

2.t4

16.20

6.24

5.H6

.41

&.B9

9.51

1.P2

1.69

.34

1.80

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.39

ATER-C02-FKLE

(100.0)

5.63

2

6

6

5

9

9

1

1

.68

43

33

94

42

02

65

85

71

34

SI

Tl

AL

Ft3

FE2

MM

MG

CA

hk

K

V

H*

HC

5

ATOMS

HEIGHT

21.02

1.58

8.57

4.36

4.55

.32

5.36

6.80

1.35

1.40

.15

.02

0.00

0.00

0.00

ATi.JMS

NUMBERS (100.0)

16.Hi

7

1

1

4

3

1

74

14

76

R3

13

96

81

32

HI

11

0

CP

OR

AB

AN

NE

LC

AC

N5

DI

WO

HY

01

MT

HW

IL

TI

RU

AP

cc

MGO/MGln-KEO

IN FtKlLS =

wtlGHT NOI'.M

(100.0)

0.00

0.00

10.15

15.65

31.45

0.00

0.00

0.00

0.00

11.37

0.00

9.43

6.92

9.20

0.00

5.08

0.00

0.00

.75

0.00

.94

NON-OXIDATION NORM

(fE2O3 CONVERTED TO FEO)

0.00

0.00

10.27

14.57

31.84

.69

0.00

0.00

0.00

12.00

0.00

0.00

24.73

0.00

0.00

5.14

0.00

0.00

.76

0.00

.64

Nl&GLl

SI

AL

FM

C

ALK

K

MG

TI

P

C/Frt

OZ

98

20.

50.

22.

6.

4.

-27*

3-COMPONENT

WT.PERCENTS

F 49.39

M 36.29

A 14.33

F 48.17

C 37.86

A 13.97

N 13.9H

K 12 . <JK

C 73.04

No. 1099

REMARKS: See under 1097.

MINERALOGY: Very fine-grained rock. Phenocrysts:

Small augite, rare olivine. Groundmass: Flow-texture;

labradorite microlites in glass, abundant magnetite,

titanaugite.

No. 1100

REMARKS: See under 1097.

MINERALOGY: Phenocrysts: Abundant, small corroded

olivines. Groundmass: An72-78, titanaugite, olivine,

magnetite, no glass.

No. 1101

REMARKS: See under 1097.

MINERALOGY: Phenocrysts: Olivine, magnetite, small

plagioclase. Groundmass: Labradorite microlites in

glass, magnetite, augite, rare olivine.

OTHER INFORMATION: A basalt from this region

examined by Comucci (1933a) contains large andesine

phenocrysts which are zoned from An32 at the center

to An50 at the crystal boundary. A similar feature has

been observed in the Simien basalts. See also

Augustithis (1964).
1100

BASALT

L. DUPARC, 1930A

„. SLOPES OF MET I VALLEY, E. OF AMPO, SHOA

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

KZO

P2O5

H2O*

H2OC02

SO3

TOTAL

ANALYSIS

45.14

1.42

18.64

9.26

4.77

.14

5.e5

10.54

2.09

1.52

.40

.66

0.00

o.oo

o.oo

0,00

0,00

0.00

0,00

100.43

V.ATER-C02-FREE

(100.0)

45.24

1.42

IB.66

9.28

4.78

.14

5.86

10.56

2.09

1.52

.4U

SI

Tl

AL

Ft3

Ft2

MN

MG

CA

NA

K

P

H +

HC

s

ATOMS

WEIGHT

21.09

.65

9.86

6.4b

3.71

.11

3.53

7.53

1.55

1.26

.17

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

16.74

.40

8.15

2.59

1.48

.04

3.?4

4.19

1.50

.72

.13

0

CB

OH

AH

AN

NE

LC

AC

NS

DI

WO

HY

OL

FT

HI

IL

TI

RU

AC

CC

MGO/MGO*FcO

IN FLMICS =

WEIGHT f.OPM

(100.0)

0.00

0,00

9.02

17.76

37.04

0.00

0.00

0.00

0.00

10.21

0,00

8,37

1.07

11.7R

1.18

2.70

0.00

0.00

,fi8

0.00

1.00

NON-OXIDATIUN NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

9.18

13.25

37.71

2.61

0.00

0.00

0.00

11.18

0.00

0.00

22.42

0.00

0.00

2.75

0.00

0.00

.89

0.00

.4H

SI

AL

F"M

C

ALK

K

100

24.)

43.V

25.1

6.6

.32

3-COMPONENT

WT.PERCENTS

F 59.73

M 24.90

A 15.37

F 49.79

C 37.40

A I?.HI

N 14.77

K 10.74

C 74.49

1101

OLlVlME LASALl

09.01m 38.20t,

L. DUPAKCi 1930A

OF ADDIS ALtM, ShOA

St02

TI02

AL2O3

FF.2O3

FEO

MNO

MGu

CAU

NA20

K20

P2O5

H?0*

H20-

C02

S03

TOTAL

ANALYS1

4 6. (.9

1.80

14.88

10.09

6.73

0.00

5.63

a. 97

2.97

1.48

0.00

1.30

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.54

*ATER-C02-FkEE

(100.0)

47.05

1.81

14.99

10.17

6.78

0.00

5.67

9.04

2.99

1.49

0.00

SI

TI

AL

Ft3

Ft2

MN

Mb

CA

NA

K

P

H*

Hc

s

ATOMS

HEIGHT

21.81

1.08

7.87

7.06

5.23

0.00

3.40

6.41

2.20

1.23

0.00

.02

0.00

0.00

0.00

ATOMS

NOrtBEWS (100.0)

17.56

.51

6.59

2. 86

2.12

0.00

3.16

3.62

2.17

.71

0.00

0

CB

OR

AB

AN

NT

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGU/MCJO+FEO

IK FEHK.S =

WtlGHT NORM

( 100.0)

.19

0.00

B.H3

25.37

23.03

0.00

0.00

0.00

0.00

17.18

0.00

7.19

0.00

14.77

0.00

3.44

0.00

0.00

0.00

0.00

.95

NON-OXIDATION NOhM

(FE203 C0t4vEKTED TO FEO)

0.00

0.00

9.01

19.05

23.49

3.70

0.00

0.00

0.00

18.83

0.00

0.00

22.42

0.00

0.00

3.51

0.00

0.00

0.00

0.00

.43

SI

AL

FM

106

20.0

49.4

.25

• 39

3.1

0.00

.44

-29

3-COMPUNENT

WT.PERCENTS

F 62.53

M 20.93

A 16.54

F 55.62

C 29.66

A 14.72

N 22.13

K 11.03

C 66.84
1102

ANORTHOCLASt TRACHYTE

0R.15N 34.40E, ,'jEAR (j(*K[ELA, ILUBABUR

L. L'JPAkC, 1930 K

SIU2

TI02

AL2O3

FE203

FEO

IwNU

MGO

CAO

NA2O

1C2U

P2O5

H2O*

H2OCO2

SO 3

TOTAL

ANALYSIS

63.17

• 32

10.01

1.C3

0.00

.06

.65

1.33

7.69

7.17

0.00

• 37

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.tO

17

1

0

1

7

7

0

.97

.83

.00

.06

.65

.33

.67

.15

.00

SI

TI

AL

FL3

FL2

MN

M6

CA

NA

K

P

H*

HC

s

ATOMS

«E1GHT

29.51

.19

9.53

1.28

0.00

.05

.39

.95

5.71

5.95

0.00

.00

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

21.94

.08

7.37

.48

0.00

.02

.34

.50

5.18

3.18

0.00

0

C"

OR

A8

AN

NE

LC

AC

MS

DI

WO

HY

OL

KT

H

vi

IL

TI

PU

AP

CC

*r. IC-HT NOPM

(100.0)

(J.00

0.00

4?.39

3S.79

0.00

7.44

0.00

5.30

1.52

3.49

• 52

0.00

0.00

0.00

0.00

.13

.43

0.00

0.00

0.00

NON-OXIDATIUN NOF-M NIGGLl

(FE2O3 COUVFKTEO TO FEO)

0.00 si

0.00

42.53

41.38

0.00

6.13 t

0.00 f

0.00

2.93 f

5.55 (

\L

"M

*LK.

1G

n

./FM

0.00 QZ

0.00

.86

0.00

0.00

.61

0.00

0.00

0.00

0.00

238

4 0.

9.

5.

45.

0!

-28

3-COMPONENT

WT.PERCENTS

F 10.55

10.lh

7.38

87.46

47.50

73.79

NO. 1102

REMARKS: See under 1097; P2 °5

 trace ; n o

 separate

determination of FeO.

MINERALOGY: Aphyric with flow-texture. Groundmass:

Very abundant anorthoclase, magnetite, rare zircon,

brown amphibole, aegirine(?), cossyrite(?), no glass.

OTHER INFORMATION: This rock forms numerous

small domes between the Baro River and the plateau.

No. 1103

MINERALOGY: No description by the author. Groundmass: Gaubert (1901) describes an assemblage of

nepheline, green pyroxene, apatite, magnetite and rare

divine.

No. 1104

MINERALOGY: Phenocrysts: Anorthoclase with glassy

inclusions, some Fe-rich olivine with pyroxene borders,

pale-green diopside with aegirine-augite borders.

Groundmass: Orthoclase microlites, diopside, olivine,

magnetite, rare quartz.

OTHER INFORMATION: This rock-type occurs between

green pantellerite (below) and obsidian (above).
1103

PHONOLlTf.

08.ION 35.3UL.

A. LACROIX, 193d

<,OfE HILLS, ILJ3AUJ R

SI02

TI02

AL203

FE203

FEO

MMO

IMGU

CAO

NA2O

K 2 U

P2U5

H2O+

H2O -

CO2

S 0 3

C L

- 0

TOTAL

ANALYSI

58.22

. 4 4

17.08

1.84

6.09

. 0 7

. 2 2

3.28

6.57

4.28

. 2 1

1.32

. 5 3

o.oo

0.00

. 1 3

o.oo

0.00

-.0 3

100.25

17.38

1.87

6.20

.07

.22

3.34

6.68

4.35

.21

5 1

Tl

AL

F t 3

F E2

MN

MCJ

CA

NA

K

P

H +

H -

C

s

ATOMS

HtlGHT

27.20

. 2 6

9.04

1.29

4.73

. 0 5

. 1 3

2.34

4.87

3.55

. 0 9

. 0 2

. 0 1

0.00

0.00

ATOMS

NUMBERS

21.12

. 1 2

7.30

. 5 0

1.85

. 0 2

. 1 2

1.28

4.62

1.98

. 0 6

Mf.O/MGG*FEU

IN FELMCS =

wElIiHT NOi'M

(100.0)

0.00

0.00

25.79

47.46

4.46

4.99

0.00

0.00

0.00

9 . M

0.00

O.CO

3.64

2.72

0.00

. 6 5

0.00

0.00

. 4 7

0.00

NON-OXIDATION NORM

(FE2O3 CONVFKTED TO FEO)

0.00

0.00

25.89

45.47

4.48

6.18

0.00

0.00

0.00

9.67

0.00

0.00

6.9V

0.00

0.00

. 8 5

0.00

0.00

. 4 7

0.00

197

34.0

MG

T I

P

C/FlA

oz

. 0 5

1 . 1

. 3 0

. 5 1

- 2 7

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

c

41.74

1.16

57.11

35.95

14.87

49.18

46.50

30.29

23.2)

1104

OLlVlnE TkACHYTE

08.56N 39.56E. FAMAL1. SHOA

A. LACROlXi 1930

5102

TIU2

AL2O3

FE2O3

FEu

M N j

M30

CAu

NA20

< 2o

P2O5

H20*

H2UC02

SO3

TOTAL

02.70

• H2

13.42

3.36

6.37

. 4 0

. 1 1

3.06

5.79

3.28

. 1 0

• fcl

• 33

0.00

0.00

0.00

0.00

0.00

0.00

100.35

WATER-C02-FKE.E

(100.0)

63.07

.82

13.50

3.3M

S I

TI

AL

F t 3

F £ 2

MN

h o

CA

NA

K

P

H-f

H -

C

s

ATOMS

HEIGHT

29.29

. 4 9

7.10

2.35

4.95

. 3 1

. 0 7

2.19

4.30

2.72

. 0 4

. 0 1

. 0 0

0.00

0.00

ATOMS

NUMBERS <IOO.O >

22.58

.22

5.70

. 9 1

1.92

. 1 2

. 0 6

1.18

4.05

1.51

. 0 3

KLlCjHT NORM

(100.0)

9.04

0.00

19. S5

49.40

NE

LC

AC

NS

D !

WO

HY

OL

KT

I L

TI

R'J

A^

CC

HGO/MGO-fFEO

IN FEl-ILS =

0.00

0.00

0.00

0.00

12. 2S

0.00

2«lh

0.00

4.91

0.00

1.57

0.00

0.00

.22

0.00

. 0 4

NON-OXIDATION NORM

(I-E2O3 COUVEKTED TO FEO)

5.51

0.00

19.68

49.72

.88

0.00

0.00

0.00

0.00

12.39

0.00

10.03

0.00

0.00

0.00

1.58

0.00

0.00

.22

0.00

.02

S I

AL

FM

ALK

2 2 9

2 9

3 0

12

2 8

. 0

. 1

. 0

. 3

3-COMPONENT

WT.PERCENTS

F 51.45

44.51

14.00

41.49

47.73

27.04

25.23
1105

SOLVSDERCITL

SIu2

TIU2

AL2O3

FF.2O3

FF.O

K'Nu

MGO

CAO

NA20

K?.U

P2O5

H20*

K2UC02

SOJ

TOTAL

uKK-.I'JAL

AijAi ySl64.42

.la

14.54

1..34

1.5 3

0.00

.34

.52

a.03

<t.32

0.00

• 44

.38

0.00

o.no

o.co

0.00

0.00

0.00

100.04

nAT£R-C02-Fr<Et

(100.0)

64.93

.16

14.65

5.3a

1.54

0.00

.34

.52

8.09

4.35

0.00

SI

TI

AL

Ft3

FE2

MN

Mo

CA

NA

K

P

H*

Hc

s

ATOMb

wtlGHT

30.10

.11

7.69

3.73

1.19

0.00

.21

.37

5.96

3.59

0.00

.01

.00

0.00

0.00

ATGfcS

NUMHERS (100.0

22.75

6

1

0

5

1

0

05

0 5

42

45

00

18

20

50

95

00

0

c.

OR

Ar>

AN

NE

LC

AC

N5

CI

WO

HY

OL

MT

H-J

IL

TI

RU

AP

CC

k>Llc-HT i*.Gf»i

(1OO.O)

Z.7R

0.00

Zi.fiO

51.10

0.00

0.00

0.00

ls.iie

0.00

2.?3

O.CO

2.?1

0.00

.OB

0.00

.34

0.00

0.00

0.00

0.00

NON-OxlDATION NORM

(FE2O3 CONvFKTED TO FEO)

5.19

0.00

26.07

51.63

0.00

0.00

0.00

0.00

4.13

2.32

0.00

10.31

0.00

0.00

0.00

.35

0.00

0.00

0.00

0.00

NlGGLl

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

252

33.6

22.H

Z.I

41.4

.i.

.0

.5

0.0

.1

10

3-COMPONfcNT

WT.PEHCENTS

F 35.1 2

M 1.7 4

A 63.1 4

F 34.80

62.39

33.57

4.04

No. 1105

MINERALOGY: Phenocrysts: Large anorthoclase, rare

albite. Groundmass: Anorthoclase, albite, rare quartz.

No. 1106

MINERALOGY: Phenocrysts: Anorthoclase, rare albite,

amphibole (laneite) and later aegirine. Groundmass:

Same as phenocrysts plus rare nepheline.

No. 1107

REMARKS: TiO2 trace.

MINERALOGY: Very fine-grained. Groundmass:

Anorthoclase, scarce aegirine and quartz.
1106

SOLVSdCRGlTE

09.28N 41.53E,

A. LACROlX. 1930

L.ALLA COL, E. OF KARSA, HARAKG(T

SI02

TIU2

AL203

FE203

FEU

MNO

M3O

CAO

NA20

K2O

P2O5

H2U+

H2UC02

SOS

TOTAL

65.14

0.00

is.eo

3.16

1.92

. 2 6

0.00

. 6 0

b.lP

4.54

0.00

. 6 0

. 1 6

0.00

0.00

0.00

0.00

0.00

0.00

100.36

V.ATER-C02-FKEE

(100.0)

65.40

0.00

15.86

3.17

SI

Ti

AL

FL3

F E2

MM

Mo

CA

<

P

H+

H -

C

S

ATOMS

HEIGHT

30.43

0.00

8.36

2.21

1.49

. 2 0

0.00

. 4 3

6.07

3.77

0.00

. 0 1

. 0 0

0.00

0.00

ATOMS

NUMBERS (100.0 )

22.H I

0.00

6.52

. A 3

. 5 6

. 0 8

0.00

. 7 3

5.56

2.03

0.00

R

R

H

N

E

C

C

S

I

3

Y

L

T

L

I

j

•j

IN FOlIC'i =

WEIGHT t.OKM

(1U0.0)

1.61

0.00

27.01

56.18

0.00

0.00

0.00

9.20

. 7 1

2.67

0.00

2.61

0.00

0.00

0.00

0.00

0.00

0.00

o.no

0.00

0.00

NON-OXiDATlUN NORM

(KE2O3 COflVErtTEC TO FEO)

3.07

0.00

27.17

56.52

0.00

0.00

0.00

0.00

3.16

2.69

0.00

7.39

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

SI

AL

FM

c

AL<

K

MG

Tl

P

2 6 0

37.2

16. «

2 . 6

43.4

.27

0.00

0 . 0

0.00

3-COMPONENT

WT.PEKCENTS

F 28.54

M 0.00

A 71.46

F 27.61

1107

LtUCOCRATlC SULV&LLRoITi

O9.2HH 41.53t, t,ALLA

A. LAtPOU, 1930

V+ <AKSA,

SIU2

TI02

AL<:03

FF203

FEO

MNO

MGU

CAy

NA20

K2U

P2O5

H20*

H2UORICiI'iAL

A.vALYSU

67.0H

0.00

16.18

1.23

2.90

• 16

0.00

• 46

6.83

4.58

0.00

. 7 9

. 1 0

0.00

0.00

0.00

0.00

0.00

0.00

100.31

hATER-C02-FkLE

(100.0)

67.47

0.00

16.27

1.24

2.92

.16

ATOMS

WEIGHT

31.34

0.00

8.56

. 8 6

2.25

. 1 ?

0.00

. 3 3

5.07

3.80

0.00

. 0 1

. 0 0

0.00

0.00

ATUMS

NUMhtRS (100.0 )

23.44

0.00

6.66

. 3 2

• R5

. 0 5

0.00

. 1 7

4.63

2.04

0.00

0

CH

OR

An

AM

NF.

LC

AC

NS

D I

WO

HY

OL

MT

HM

IL

T I

R'J

AP

CC

MGU/MGO+FEO

1,1 FEKR5 =

rtCICjHT flOFK

(100.0)

7.10

0.00

27.30

5b.03

0.00

0.00

0.00

(1.00

2.05

0.00

3.61

0.00

1.69

0.00

0.00

0,00

0.00

0.00

0.00

0.00

NON-OXIUATION NORM

(FE203 COuVFKTEl) TO FEO)

5.92

0.00

27.36

58.17

0.00

0.00

0.00

0.00

. 0 6

2.06

0.00

6.44

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

MG

TI

P

C/F11

0 7

0.00

0 . 0

0.00

. 1 4

2 5

3-COMPONtNT

wT.PLRCENTS

F 26.5«

M 0.00

A 73.42

F 25.81
A. LACROIX. 1930

SI 02

TIO2

AL2O3

FE203

FEO

MNO

MGU

CAU

NA20

K2u

P2O5

H20 +

H2Ucnz S03

TOTAL

OKIMilAL

67.30

.79

10.30

3.09

t>«9

.3

.3

1.9

5.9

3.5

.1

I

.25

.16

0.00

0.00

0.00

0.00

0.00

0.00

100.13

«ATER-C02-FhihE

(100.0)

67.49

.79

10.33

3.1U

6.01

.32

.36

1.93

5.96

3.60

.12

SI

Tl

AL

FL3

Ft2

MN

MG

CA

NA

K

P

H +

hC

s

ATOMS

WEIGHT

31.44

.47

5.45

2.16

4.66

.25

.22

1.37

4.41

2.98

.05

.00

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

24.01

4

1

4

1

.21

33

S3

79

10

19

73

11

64

04

Xi-t FEI'.ICb -

KLlChT MORI,

(100.0)

lb.22

0.00

21.33

33.05

0.00

0.00

0.00

B.99

1.69

7.K1

0.00

7.15

0.00

0.00

0.00

1.50

0.00

0.00

• 2fc

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

19.74

0.00

21.46

33.25

0.00

0.00

0.00

0.00

4.09

7.88

0.00

11.80

0.00

0.00

0.00

1.51

0.00

0.00

• 2b

0.00

h1GGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

276

24.9

33

8

33

2

5

5

1

2ft

07

4

21

25

68

3-C0MP0NENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

O.I.

47.87

1.90

50.24

44.23

9.35

46.42

51.ttH

31.31?

16.77

96.14

No. 1108

MINERALOGY: Resembles solvsbergites 1105-7.

Phenocrysts: Anorthoclase, hedenbergite. Groundmass:

Anorthoclase, aegirine(?), quartz, cossyrite, glass,

Fe-rich olivine in some specimens.

No. 1109

REMARKS: No separate determination of f^O-; subaluminous.

MINERALOGY: Groundmass: Glass, cossyrite,

hedenbergite, magnetite.

No. 1110

MINERALOGY: Resembles Karsa solvsbergites 1105-7.

Phenocrysts: Anorthoclase, Hedenbergite. Groundmass:

Anorthoclase, green pyroxene (aegirine?), quartz

cossyrite, glass, Fe-rich olivine in some specimens.
1109

PANTFLLERITIC CKSIl,lAN

09.00H 39.56E. N. SIUL FANTALI.

A. LACROIX. 1930

SI02

TI02

AL203

FF<:03

FEU

MNU

M3U

CAO

NA2O

K2O

P205

H20*

H2oCO2

SO3

CL

TOTAL

DKIGIMAL

ANALYSIS

69.06

.61

6.30

4.98

6.?6

.17

.27

.94

7.37

3.39

.07

.47

0.00

0.00

.47

.06

0.00

0.00

0.00

100.42

KATER-C02-FREE

(100.0)

69.46

.61

6.34

5.01

7.41

3.41

.07

SI

TI

AL

Ft3

FE2

HN

Mo

CA

NA

K

P

H»

Hc

s

ATOMS

*E16HT

32.26

.37

3.33

3.48

4.87

.13

.16

.67

5.47

2.81

.03

.01

0.00

0.00

• 19

ATOMS

NUMBERS (100.0)

2 4. BO

.16

2.67

1.35

1.88

.05

.14

.36

5.13

1.55

.02

IN FtMCS =

29.38

0.00

20.20

13.57

U.OO

0.00

0.00

14.53

7.64

3.79

0.00

9.58

0.00

0.00

0.00

1.16

0.00

0.00

.15

0.00

NON-OXIDATION NORM

(FE2O3 CONVFKTEP TO FEO)

31.95

0.00

20.40

13.70

0.00

0.00

0.00

0.00

11.59

3.84

0.00

17.19

0.00

0.00

0.00

1.18

0.00

0.00

.16

0.00

.05

SI

AL

FM

C

ALK

292

15.7

40.5

4.3

39.5

3-C0MP0NENT

WT.PERCENTS

F

M

A

F

C

A

N

K.

50.47

1.21

4B.32

49.00

4.10

46.90

62.99

28.97

1110

POKPHYRITIC C.RANOPHYRE uENOLlTHS Ik PANTELLERITE)

08.56N 39.56L, FANTALI. SHOA

A. LACRJIX. 1930

SI02

TI02

AL2O3

FF2O3

FEu

MNO

MGU

CAO

NA20

K20

P?U5

H20*

H2UC02

S03

TOTAL

AnALYSl

69.P6

.52

11.41

3.4fl

3.3?

• 39

0.00

.92

5.72

4.22

0.00

.29

.07

0.00

0.00

0.00

o.oo

0.00

0.00

100.?3

4.23

0.00

SI

TI

AL

FL3

FL2

MN

HO

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

32.64

.31

6.04

2.43

2.60

.30

0.00

.66

4.24

3.50

U.OO

.00

.00

0.00

0.00

ATOMS

NlMBERS (100.0)

24.59

.14

4.73

.92

.99

.12

0.00

.35

3.91

1.90

0.00

0

CD

OR

AB

AM

NF

LC

AC

N5

01

WO

HY

OL

MT

H*l

IL

TI

R;J

AP

cc

MGO/MGO+FfcO

IN FEl.ICS =

ULICH T LIO^M

(100.0)

20.26

0.00

25.04

35.?0

0.00

0.00

0.00

10.11

.44

4.09

0.00

3.P7

O.PO

0.00

0.00

.99

0.00

0.00

0,00

0,00

0,00

NON-OXIDATIUN NORM

(FE203 CONVERTEO TO FEO)

21.99

0.00

25.21

35.44

0.00

0.00

0.00

0.00

3.14

4.11

0.00

9.12

0.00

O.OC

0.00

1.00

0.00

0.00

0,00

0.00

0.00

SI

AL

FM

C

ALK

321

30.9

26.5

4.5

38.0

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

40.73

0.00

59.27

38.61

5.20

56.19

52.67

38. Bh

8.47
1111

P0RPHYR1TIC ObSHilAN (':LLL>EL' TUFM

08.561-1 39.55E, 5. SIj, FAN1AL1, SHOA

A. LACRO1X. 1930

SIU2

TI02

AL2O3

FE203

FEU

MNU

MGO

CAO

NA20

K20

P2U5

H20*

H?0-

C 0 2

S 0 3

TOTAL

OKl&INAl

70.52

.6.0

9.30

1.38

b.72

. 2 4

0.00

1.92

5.98

4.C1

. 0 6

. 1 1

. 1 4

0.00

0.00

0.00

0.00

0.00

0.00

10U.05

*ATER-C02-FKtE

70.71

. 6 0

9.33

1.36

5.74

. 2 4

0.00

1.93

6.00

4.02

. 0 6

(100.0)

S I

T l

AL

F t 3

F t 2

MN

Mtj

CA

NA

K

P

H *

H -

C

s

ATOMS

WEIGHT

32.95

. 3 6

4.92

. 9 7

4.45

. 1 9

0.00

1.37

4.44

3.33

. 0 3

. 0 0

. 0 0

0.00

0.00

ATOMS

NUMBERS (100.0 )

24.96

. 1 6

3.86

. 3 7

1.70

. 0 7

0.00

. 7 3

4.11

l.fi l

. 0 2

HEIGHT NORM

(100.0)

2h.65

0.00

23.f3

25.54

0.00

0.00

0.00

H.01

4.83

WA

IL

T I

RU

AP

cc

MGO/vlGC-ft-LU

IN FEMICS =

O.CO

1.14

0.00

0.00

. 1 3

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

27.35

0.00

23.89

25.61

0.00

0.00

0.00

0.00

5.91

8.25

0.00

7.72

0.00

0.00

0.00

1.15

0.00

0.00

.13

0.00

0.00

c

ALK

321

25.0

27.5

9.4

38.1

.41

0.00

2.1

.12

3-COMPONENT

WT.PtHCENTS

F 41.54

M 0.00

A 58.46

F 37.35

C 10.10

A 52.55

N 50.21

K 33.67

C 16.12

NO. 1111

MINERALOGY: Phenocrysts: Alkali feldspar, corroded

quartz, brown amphibole, cossyrite, magnetite.

Groundmass: Glass, feldspar, pyroxene, and magnetite

microlites; bears fragments of porphyritic basalt, and

corroded isolated An30 xenocrysts.

No. 1112

MINERALOGY: Flow-texture. Phenocrysts: Abundant

aegirine-hedenbergite; cossyrite, anorthoclase, Fe-ric h

olivine rimmed with hedenbergite. Groundmass: Glass,

with microlites of feldspar and green femics.

No. 1113

MINERALOGY: Phenocrysts: Hedenbergite-aegirine,

cossyrite, corroded quartz, sodic orthoclase.

Groundmass: Yellow glass, with pyroxene microlites.

OTHER INFORMATION: Occurs above rock 1104.
1112

AEGIK1NE. PAUTELLERITE (aELDEl, TUFF)

08.56N 39.55E. S. Sliit rANIAlI , SriOA

A. LACROIX. 1930

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K2U

P2O5

H2O*

H2OCO2

503

TOTAL

AUALYSI

70.7fc

.59

b.31

3.96

4.61

.22

0.00

1.5a

5.64

4.06

0.00

• 46

.23

0.00

0.00

0.00

0.00

0.00

0.00

100.42

*ATER-C02-FREE

(100.0)

70.95

4.07

0.00

SI

Tl

AL

Ft3

Ft2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

33.06

.35

4.40

2.77

3.58

.17

0.00

1.13

4.18

3.37

0.00

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.14

.16

3.4H

1.06

1.37

.07

0.00

.60

3.89

1.H4

0.00

WEIGHT ^OPM

(10C.0)

28.42

0.00

24.12

20.15

0.00

0.00

0.00

11.52

3.43

7.03

0.00

4.21

0.00

0.00

0.00

1.12

0.00

0.00

0.00

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

30.45

0.00

24.31

20.30

0.00

0.00

0.00

0.00

6.52

7.08

0.00

10.20

0.00

0.00

0.00

1.13

0.00

0.00

o.oo

0.00

0.00

SI

AL

FM

c

ALK

K

MG

TI

P

C/FM

OZ

326

22.6

32.4

7.H

37.2

• 3?

0.00

2.0

0.00

.24

121

3-CQKPONENT

WT.PERCENTS

F 46.91

M 0.00

A 53.09

F 43.17

50.00

35.99

14.01

1113

PANTELLERlTlC GliSIuIAN d-LCEhT FLOv.)

08.5fe)M 39.56E, S. SIL>L FAMTALI , SHOA

A. LACKOIX. 1930

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20+

H20-

C02

503

TOTAL

OklflNAL

71.30

.61

7.42

U 9 6

6.79

.36

0.00

.60

6.63

4.26

0.00

• 19

.03

0.00

0.00

0.00

0.00

0.00

0.00

100.15

4.26

0.00

SI

TI

AL

Ft3

FE2

MN

Mlj

CA

NA

P

H*

HC

s

ATOMS

HEIGHT

33.31

.37

3.93

1.37

5.2 B

.28

0.00

.43

4.92

3.54

0.00

.00

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.30

.16

3.10

.52

2.02

.11

0.00

• ?3

4.56

1.93

0.00

WEIGHT NOBh

(100.0)

31. P2

U.OO

14.41

0.00

0.00

0.00

S.24

WO

HY

OL

MT

HM

IL

TI

R LI

AP

CC

MG0/MG0*FEO

IN FEM1C3 =

0.00

10.75

0.00

0.00

0.00

1.16

o.oo 0.00

0.00

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

32.83

0.00

25.36

14.46

0.00

0.00

0.00

0.00

9.78

2.67

0.00

13.73

0.00

0.00

0.00

1.16

0.00

0.00

0.00

0.00

0.00

SI

AL

FM

C

ALK

K

MG

TI

P

329

20.2

34.5

3.0

42.3

.30

0.00

2.1

0.00

3-COMPONENT

WT.PERCENTS

F 44.55

M 0.00

A 55.45

F 43.23

C 2.96

A 53.80

N 57.70

K 37.08

C 5.22
1114

AEGIR1NE PANTELLERITF

12.44N 43.0SE. DAhlTA,

A. LACROIX.* 1930

SIo2

T102

AL2O3

FE2O3

FEU

MNU

MGO

CAO

NA2O

K2O

P2U5

H2O*

H2OCO2

SO3

TOTAL

ANALYSIS

73.28

• 47

b.33

5.72

1.19

0.00

.35

.7?

4.34

4.03

0.00

1.37

.32

0.00

O.OO

0.00

0.00

0.00

o.no

100.12

^itR—C02~FKEE

(100.0)

4.45

.46

8.46

5.81

1.21

0.00

.36

.73

4.41

4.09

0.00

SI

TI

AL

FE3

FE2

MN

MCi

CA

N»

K

P

H*

Hc

s

ATOMS

HEIGHT

34.24

.28

4.41

4.00

.92

0.00

.21

.51

3.22

3.35

0.00

.02

.00

0.00

0.00

ATOMS

NUMBERS 1100.0)

26.04

3

1

0

2

1

0

13

49

53

35

00

19

27

99

R3

00

0

CB

01*

AS

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HI

IL

TI

P.U

AO

CC

MGO/MGO+TLO

I,, FE.MCS =

KtlftHT NOKM

(100.0)

35.11

0.00

24.26

20.69

0.00

0.00

0.00

14.72

0.00

3.00

0.00

.23

0.00

1.07

0.00

.91

U.OO

0.00

0.00

0.00

.59

NON-OxlDATION NORM

(FE2O3 COUVEHTED TO FEO)

37.04

0.00

24.54

20.93

0.00

0.00

0.00

0.00

3.93

3.24

0.00

9.41

0.00

0.00

0.00

.92

0.00

0.00

0.00

o.oo

.10

SI

AL

FM

cALK

<

MG

TI

P

C/FM

QZ

400

26.8

31.9

4.2

37.1

.3R

• 09

1.9

0.00

.13

182

3-COMPONENT

WT.pEROENTS

F 44.21

M 2.24

A 53.55

F 43.19

C 4.50

A 52.31

N 47.74

K 44.33

NO. 1114

REMARKS: P2O5 trace.

MINERALOGY: None given.

No. 1115

MINERALOGY: Poor in femics, so not designated a

pantellerite.

No. 1116

REMARKS: MnO and CaO traces.

MINERALOGY: None given.
1115

COMENuITt

11.55.M 42.57E,

A. LACROIx. 1930

NT. -\k LA, AFAR AND IS5A

SI02

TIU2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

<20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

75.P6

• 39

9.75

2.00

1.98

.08

0.00

•

 K R

3.32

4.72

0.00

• El

.75

0.00

0.00

0.00

0.00

0.00

0.00

100.2*

»jATEK-C02-FRLE

(100.0)

2.01

.08

3.36

4.78

0.00

SI

TI

AL

Ft3

Ft2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

35.44

.23

5.16

1.40

1.54

.06

0.00

.41

2.46

3.92

0.00

.01

.01

o.oo 0.00

ATOMS

NUMBERS (100.0)

26.66

.10

4.04

.53

.58

.02

0.00

.22

2.26

2.12

0.00

*1GO/MGO*FtO

let FLMCS =

WEIGHT NORM

(100.0)

3a.03

0.00

2B.35

24.15

0.00

0.00

0.00

3.1*8

0.00

2.61

0.00

l.?3

0.00

1.00

0.00

.75

0.00

0.00

U.OO

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

38.05

0.00

28.46

24.24

0.00

0.00

0.00

0.00

1.03

2.62

0.00

4.85

0.00

0.00

0.00

.75

0.00

0.00

0.00

0.00

AL

FM

C

ALK

K

MG

TI

P

C/FM

UZ

36.3

20.4

3« V

39.4

.4R

O.UO

1.4

0.00

.19

230

3-COMPONENT

WT.PERCENTS

F 33.11

M 0.00

A 66.89

F 31.59

C 4.60

A 63.81

N 3D.52

K 54.76

C 6.73

1116

AEGIK1NE PAKTELLERITE .

11.19N 42.55E. HOL-HOL* AFAH AND ISSA

A. LACRtJlX. 1930

SIU2

TI02

AL2O3

FF2O3

FEO

MNO

MGO

CAU

NA20

K?0

P2O5

H20*

H2UC02

503

TOTAL

OHltlNAL

ANALYSIS

78.72

.31

7.7H

4.39

1.31

0.00

0.00

0.00

4.24

3.03

0.00

.31

.22

0.00

O.PO

o.oo 0.00

0.00

0.00

100.31

WATER-C02-FKEE

(100.0)

78.89

.31

7.80

4.40

1.31

0.00

0.00

0.00

4.25

3.04

0.00

SI

Tl

AL

FL3

FL2

MN

MG

CA

NA

K

P

H*

Hc

s

ATOMS

WEIGHT

36. 78

.19

4.12

3.07

1.02

0.00

0.00

o.oo 3.15

2.52

0.00

.00

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

27.27

.08

3.18

1.15

.3R

0.00

0.00

0.00

2.85

1.34

0.00

cr

MGO/MCiO«(-tO

l i. FEMII.S -

fctlf'HT NORh

(100.0)

44.68

0.00

1H.O0

23.IB

0.00

0.00

0.00

11.35

U.OO

U.OO

0.00

1.50

0.00

• 71

0.00

.59

O.OO

0.00

0.00

0.00

NON-OX IDAT ION NORM

(FE2O3 CONVF.KTEO TO FEO)

46.32

0.00

18.15

23.37

0.00

0.00

0.00

0.00

3.02

0.00

0.00

8.53

0.00

0.00

o.oo .60

0.00

0.00

0.00

0.00

40.2

.32

0.00

1.5

0.00

0.00

291

3-COMPONENT

WT.PERCENTS

F 43.95

M 0.00

A 56.05

F 43.95

C 0.00

A 56.05

N 58.32

K 41.6H

C 0.00
09.02H 38.4iE. ST. !,F.bk,,L CHUhCri, ADDIS ALABA , SHOA

H.P.T. ROHLEDEK AND C.5. HITCHES, 1930

SIU2

TI02

AL203

FE2O3

FFO

MNU

MGU

CAU

NA20

PC20

P2O5

H2O +

H2UC02

S03

S

BrtO

V1O3

TOTAL

ANALY'ilb

4*1.59

2.1ft

14.23

3.33

9.33

.20

B.72

10.96

2.17

.72

.42

1.82

.60

0.00

0.00

.01

.02

.05

0.00

100.33

«ATtR-C02-FKEE

(100.0)

46.60

2.21

14.55

3.40

9.54

.20

8.91

11.20

2.22

.74

.43

SI

TI

AL

Ft3

Ft2

MN

MC>

CA

NA

K

P

H+

HC

s

ATOMS

WEIGHT

21.30

1.29

7.53

2.33

7.25

.15

5.26

7.83

1.61

.60

.18

.02

.01

0.00

0.00

ATOMS

NUiiHERS (100.0

17.24

6

2

4

4

1

61

3

9

9

0

9

4'

?

}

1

0

CR

OR

AB

AN

NE

LC

AC

NS

DI

teO

HY

OL

MT

H»i

IL

TI

RU

AP

CC

MGO/MGO+FEO

In HEMICS =

WL1CHT NOPM

(100.0)

0.00

0.00

4.36

18.80

27.53

0.00

o.co

0.00

0.00

2 0. 7R

0.00

4.62

13.64

4.95

0.00

4.19

0.00

0.00

.94

0.00

.72

NON-OXIDATIGN NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

4.39

17.89

27.71

.56

0.00

0.00

0.00

21.25

0.00

0.00

23.04

0.00

0.00

4.22

0.00

0.00

.94

0.00

.60

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F 52.16

H 35.93

A 11.91

F 47.76

C 41.34

A 10.90

N 15.67

K 5.20

C 79.13

No. 1117

MINERALOGY: Phenocrysts: Serpentinised olivine.

Groundmass: Plagioclase, augite, magnetite, olivine(?).

No. 1118

REMARKS: No separate determination of FeO. The

nature of this rock is puzzling, and the presence of

native carbon suggests contamination.

MINERALOGY: Not given.

No. 1119

MINERALOGY: None given.
1118

ROCK FROM LARGE BLISTERS 1,'J itELDED TJFF

OR.55N 39.55E, N.bj. OK METAHARA. SHOA

H.R.T. ROhLEDEK AND C.b. H1TCHEM, 1930

5102

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P205

H20+

H20-

C02

S03

Bfto

Cl_

C

-0

T01AL

ORIGINAL

ANALYSIS

SI.11

.50

10.03

6.99

0.00

.24

1.25

6.36

5.20

6.19

.13

2.83

1.07

5.28

1.P2

.05

.19

1.19

-.04

100.39

WATER-C02-FREE

(100.0)

58.08

.57

11.40

7.94

0.00

.27

1.42

7.23

5.91

7.03

.15

SI

TI

AL

Ft3

FE2

MM

Mb

CA

NA

K

P

ATOMS

WEIGHT

23.88

.30

5.31

4.89

0.00

.19

.75

4.55

3.86

5.14

.06

ATOKS

NUMBERS (100.0)

21.08

.16

4.R7

2.17

0.00

.08

.77

2.81

4.16

3.26

.05

MGU/MGGtFLO

IN FEhlCS =

.41

HEIGHT MOF'M

(100.0)

2.90

0.00

39.30

IB.27

0.00

0.00

0.00

21.73

1.01

0.00

0.00

3.34

0.00

0.00

0.00

.55

0.00

.25

.30

11.90

.41

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO]

6.57

o.oo 39.87

18.54

0.00

0.00

0.00

0.00

6.85

0.00

0.00

14.31

0.00

0.00

0.00

1.03

0.00

0.00

.31

12.07

175

20.3

3-COMPONENT

wT.PERCENTS

F 35.61

28.25

25.71

46.04

79.30

34.87

35. R3

1119

ALKAL I TRAChYTt

09.02H 38.47E, .iRITIbri U-.ASS,, ADDIS AEAF-.A,

H.P.T. RUHLEDEk AND C.5. HITCHEN. 1930

SI02

TIU2

AL2O3

FE2O3

FEO

MNO

MGU

CAO

NA20

K20

P2U5

H20*

H2UCOi

S03

S

PflO

V203

TOTAL

UKIr,INA(.

ANALYSIS

63.13

1.14

15.72

2.50

1.77

.21

.81

1.72

4.55

4.09

.26

3.03

1.00

0.00

0.00

.01

.11

.01

0.00

100.06

WATER-C02-FKEE

(100.0 )

65.83

1.19

16.39

2.61

1.85

.22

.84

1.79

4.74

SI

TI

AL

FE3

Ft2

MM

MC)

CA

NA

<

P

H+

HC

s

ATOMS

WEIGHT

29.49

.63

8.32

1.75

1.38

.16

.49

1.23

3.38

3.40

.11

.04

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

23.00

.31

6.75

.69

.54

.06

.44

.67

3.22

1.90

.08

HEIGHT NOf;M

(100.0)

17.32

1.26

25.27

40.25

7.32

0.00

o.oo 0.00

0.00

0.00

0.00

2.11

0.00

3.24

.38

2.26

0.00

0.00

NON-OXIDATION NORM

^E203 CONVEKTE O TO FEO)

14.78

1.27

25.40

40.45

7.36

0.00

0.00

0.00

0.00

0.00

0.00

7.8K

0.00

0.00

0.00

2.27

0.00

0.00

SI

AL

FM

C

ALK

275

40.4

20. H

8.1

30.7

C/TM

01

3-COMPONENT

WT.PERCENTS

F 31.12

M 5.90

A 62.97

F 29.19

C 11.76

A 59.06

N 43.92

K 39.4ft

C 16.60

CC

MGO/HGO+HEO

IN FEMCS =
1120

PANTELLEKIT L

08.55N 39.55E, LiETfciEt

H.P.T. ROHLEDtN AND C.5.

f'ANTALI AND METAHARA

HITCHEN, 1930

SIu2

TI02

AL2O3

FE2O3

FEO

MNU

WGU

CAu

NA20

K20

P2O5

H20 +

H20-

C02

S03

BflO

CL

TOTAl

ORIGI'JA L

ANALYSIS

6b.69

• 40

9.98

0.52

.f,8

.14

.03

.76

5.P4

4.23

.07

.?0

.04

0.00

.10

.06

.02

0.00

0.00

99.76

fcATER-C02-FREE

(100.0)

69.15

.40

10.05

8.58

.68

.14

.03

.77

5.88

4.26

.07

SI

TI

AL.

FE3

FE2

MN

MCJ

CA

NA

K

P

ATOMS

HEIGHT

32.09

.24

5.28

5.96

.53

.11

.02

.54

4.33

3.51

.03

ATUMS

NUhBEHS (100.0

24.44

4

2

4

1

11

19

29

20

04

02

29

03

92

02

0

Cfl

OR

A?

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

IL

TI

Rl.l

A?

cc

MGU/MGO-ff CO

I J^ FtMCS =

wtlGHT NC^M

(100.0)

22.72

0.00

25.?3

27.92

0.00

O.CO

0.00

ly.33

0.00

.16

1.33

0.00

0.00

1.51

• e.R

.76

0.00

0.00

.1?

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVEKTED TO FEO)

24.45

0.00

25.65

28.39

0.00

0.00

0.00

0.00

5.19

3.07

0.00

12.31

0.00

0.00

0.00

.78

0.00

0.00

.16

0.00

.01

SI

AL

FM

C

ALK

309

26

32

3

37

C/FM

OZ

3-COMPONtNT

HT.PERCENTS

F 47.67

53.92

39.06

7.0?

No. 1120

MINERALOGY: Flow-texture. Phenocrysts:

Anorthoclase, quartz, aegirine-augite, cossyrite,

riebeckite. Groundmass: Glass.

No. 1121

MINERALOGY: Flow-texture. Phenocrysts: Anorthoclase, quartz, aegirine-augite, cossyrite, riebeckite.

Groundmass: Glass.

No. 1122

MINERALOGY: None given.
1121

PANTFLLERITE

08.59N 39.54E, ON CONi OF FANTAl. I , SHOA

H.P.T. ROhLLDEk AND C.S. HITCHEM, 1930

SI02

TI02

AL2O3

FE<!03

FEO

MNJ

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2Ocot

S03

S

BUO

OKIOINA L

ANALYSIS

70.99

.38

9.18

3.15

4.67

.25

.19

.71

6.07

4.24

.28

• ?2

.02

0.00

0.00

.01

.01

0.00

WATER-C02-FREE

(100.0)

70.91

.38

9.17

3.15

4.66

.25

.19

.71

6.06

4.2'.

.28

51

Tl

AL

FE3

F12

MN

ho

CA

NA

K

P

Hf

HC

5

ATOMS

*EIGHT

33.17

.23

4.86

2.20

3.63

.19

.11

.51

4.50

3.52

.12

.00

.00

0.00

0.00

ATOMS

NUMBERS (100.01

25.00

3

1

4

1

10

81

84

38

07

10

27

15

91

08

0

OR

AR

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

|-|M

IL

TI

RLI

AP

CC

MGO/MCiO*/E0

IN FEMICS =

WtlGHT NORh

(100.0)

27.13

0.00

25.10

23.54

0.00

0.00

0.00

9.13

4.08

1.66

0.00

a.02

0.00

0.00

0.00

.72

0.00

0.00

.61

0.00

.07

NON-OXIDATION NORM

(FE2O3 CONVEKTED TO FEO)

28.73

0.00

25.25

23.69

0.00

0.00

0.00

0.00

6.53

1.68

0.00

12.78

0.00

0.00

0.00

.73

0.00

0.00

.62

0.00

.05

329

25.

3-COMPONtNT

wT.PERCENTS

F 42.69

M 1.04

A 56.2R

F 41.51

55.08

38.48

6.44

1122

PANTELLEHlTfc

O9.O3H 38.46E, G E

H.P.T. ROHLEDER AND

MA.N EhbASSy,

. S. H1TCHF.N,

ADDIS ABAbA,

1930

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA^O

K20

P205

H20*

H2OS03

S

ATER-C02-FREE

(100.0)

2.85

.42

1.10

3.95

2.42

.09

.28

.39

3.98

4.38

.15

SI

Tl

AL

FE3

FE2

MN

MO

CA

NA

<

P

ATOMS

WEIGHT

33.34

5

2

1

2

3

25

75

71

84

07

16

27

89

56

07

ATUMS

NlMHfcHS (100.0

25.46

4

1

2

1

11

57

04

71

03

14

15

70

95

05

0

CR

OR

An

AN

NF.

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

PU

AD

CC

«IGO/MG0»FfcO

IN FEMILS =

KtlGHT KOftH

(100.0)

31.97

0.00

2!>.</5

32.65

0.00

0.00

0.00

.99

0.00

.86

0.00

1.20

0.00

5.25

0.00

.79

0.00

0.00

.34

0.00

.49

NON-OX I DAT I ON NORM

OE2O 3 CONVERTED TO FEO)

28.53

0.00

26.15

32.90

0.00

0.00

0.00

0.00

.26

.91

0.00

10.11

0.00

0.00

0.00

.80

0.00

0.00

.34

0.00

.08

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

381

34.

28.

2.

34.

1.

3-COHPONENT

WT.PEHCENTS

F 42.45

M 1.84

A 55.71

F 42.13

45.51

50.06

4.43
1123

PANTELLLHITIC UhSIpl

08.36N 39.08E( HO

H.P.T. MOHLLDLH AND

SHOA

HITC-HEN, 1930

SI02

TIU2

AL203

FE2O3

FEU

MNu

MGO

CAU

NA2O

K2U

P2U5

H2O-*

H2UC02

SO3

s

TOTAL

ANAL YSI

71.63

.36

11.31

2.4 1

3.56

.20

.02

.41

b.f. 1

4.56

.07

.25

0.00

0.00

0.00

.01

0.00

0.00

0.00

100.40

NATER-C02-FKEE

(100.0)

SI

Tl

AL

FL3

FE2

MN

MO.

C«

NA

K

P

Ht

Hc

s

33.47

.22

5.98

1.69

2.77

.15

.01

.29

4.16

3.79

.03

.00

0.00

0.00

0.00

ATOfcS

NUrtBEHS (100.0)

25.02

1.04

.06

.01

.15

3.80

2.03

.02

0

C

1!

09

A1

AN

NE

LC

AC

NS

DI

WO

HY

OL

I*!T

HM

IL

TI

RU

An

CC

.VL'CIH T r-.O^M

(100.0)

23. M4

0.00

26.99

32.70

0.00

0.00

0.00

b.98

l.f 1

1.45

0.00

'j.f-0

0.00

0.00

0.00

.ftfi

0.00

0.00

.15

0.00

NON-OXIDATION NORM

(FE2O3 COrivFhlTED TO FEO)

25.05

0.00

27.11

32.85

0.00

0.00

0.00

0.00

3.47

1.4b

0.00

9.23

0.00

0.00

0.00

.69

0.00

0.00

.15

0.00

3-COMPONENT

WT.PERCENTS

F 36.94

36.07

2.48

61. 4")

53.02

43.10

3.A8

No. 1123

REMARKS: No separate determination of H^O-.

MINERALOGY: None given.

No. 1124

REMARKS: No separate determination of H_O-.

MINERALOGY: None given.

No. 1125

REMARKS: High-alumina basalt.

MINERALOGY: Dark, dense rock. Phenocrysts: Rare

An50, olivine. Groundmass: An50, olivine, augite,

rare magnetite and glass.
1124

PANTELLEMTl

O9.OIH 38.46E, NEAR JuBILEt PALACE, ADDIS ABABA,

H.P.T. ROHLEDER AND C.S. H1TCHEN, 1930

SI02

TI02

AL2O3

FE2O3

FEO

MMU

Mf,0

CAO

NA2O

K?O

P205

H2Q+

H2OC02

S03

TOTAL

ANALYSIS

71.91

.41

11.44

2.67

2.76

.14

.IS

.21

4.38

4.63

.04

1.18

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.95

WATER-C02-FREE

(100.0)

72.81

.42

11.58

2.70

2.79

.14

.IB

.21

4.43

4.69

SI

TI

AL

Ft3

FL2

MN

Mb

CA

NA

K

P

H*

HC

s

ATOMS

HEIGHT

33.60

.25

6.05

1.87

2.15

.11

.11

.15

3.25

3.84

.02

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.39

.11

4.76

.71

.82

.04

.09

.08

3.00

2.09

.01

CC

MGO/MGO+FF.U

In FEl-'ICS =

WEIGHT NOPN':

(100.0)

27.80

0.00

27.78

33.44

0.00

CJ.OO

0.00

3.69

0.00

.72

0.00

3.62

0.00

2.08

0.00

.79

0.00

0.00

• 09

0.00

NON-OX I DAT I ON NORM

(FEZ03 CONVFKTEO TO FEO)

27.00

0.00

27.93

33.61

0.00

0.00

0.00

0.00

.9H

.73

0.00

8.87

0.00

0.00

0.00

.79

0.00

0.00

.09

0.00

C/FU

3-C0MP0NENT

WT.PEHCENTS

F 37.14

37.06

1.43

61.50

47.51

50.22

1125

OLlVlNE uASAlT

09.02.J 3S.46E,

P. COMUCCI, 1432

SIU2

TI02

AL2O3

FE2O3

FEU

MNU

MGO

CAu

NA20

K20

P2O5

H20*

H20-

COZ

S03

47.33

.79

22.17

.40

7.88

.16

7.72

9.74

2.61

1.20

0.00

SI

TI

AL

F L 3

FE2

MN

Mli

CA

NA

<

P

Ht

Hc

s

ATOMS

«EICHT

21.80

.47

11.57

.27

6.04

.12

4.59

6.86

1.91

.98

0.00

.01

.01

0.00

0.00

ATUhS

NUMBERS (100.0)

17.&7

.21

9.42

.11

2.38

.05

4.16

3.76

1.R2

• 55

0.00

O.CO

0.00

0.00

R

M

E

S

I

i

r

i.j

IK FEMICS =

HEIGHT NORM

( 100.0)

O.CO

0.00

7.09

18.07

45.24

2.18

0.00

0.00

0.00

2.60

0.00

0.00

22.74

.57

o.no

1.50

0.00

0.00

0.00

0.00

.66

NON-OXIDATION HORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

7.09

17.63

45.27

2.43

0.00

0.00

0.00

2.61

o.oo

o.oo

23.46

0.00

0.00

1.50

0.00

0.00

0.00

0.00

.64

SI

AL

FM

C

ALtC

104

2 8 . tt

40.9

23. U

7.3

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

41.80

38.99

19.21

37.94

44.63

17.43

19.25

8.84
1126

ANORTHOCLAS L TRAChYTL

08.58N 3(J.46F» bKV

P. COMUCCI , 1932

OF ADDIS ABABA (OUAKRY bY KAILwAY)

SIU2

TIU2

AL2O3

FF2O3

FEO

MNU

MSO

CAO

NA2O

K 2 U

P2O5

H2O +

H2UCO<!

5 0 3

TOTAL

URICIKAL

ANALYSIS

61.78

1.10

13.23

7.<?8

0.00

. 1 2

. 7 6

3.1ft

4.27

4.39

0.00

1.76

1.70

0.00

0.00

0.00

o.oo

0.00

0.00

100.27

l»AT£R-C02-FKfcE

63.82

1.14

13.67

8.24

0.00

.12

.79

3.28

4.41

4.53

0.00

(100.0)

SI

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

Ht

HC

s

0

ATOMS

HEIGHT

28.66

.66

7.00

5.58

0.00

.09

.46

2.27

3.17

3.64

0.00

.02

.02

0.00

0.00

48.49

ATOMS

NUMBERS (100.0 )

22.70

.30

5.73

2.21

0.00

.04

.42

1.25

3.04

2.06

0.00

62.25

WEIGHT NORM

(100.0)

15.«2

0.00

26.87

37.41

4.03

0.00

IL

TI

R ' J

Ai">

cc

MGO/MGO+l-tO

IH F£MC3 =

.71

1.70

U.OO

O.CO

0.00

1.00

NON-OXIUATION NOPM

(FE203 CONVERTED TO FEO)

10.39

0.00

27.30

38.01

4.09

0.00

0.00

0.00

0.00

10.88

0.00

7.15

0.00

0.00

0.00

2.19

0.00

0.00

0.00

0.00

.19

C/FM

oz

243

30.7

28.5

13.4

27.4

.40

.16

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

45.86

4.37

49.77

40.26

16.04

43.69

36.06

37.06

26.B6

No. 1126

REMARKS: FeO trace.

MINERALOGY: Flow-texture. Groundmass: Brown

glass,"• abundant anorthoclase/sanidine, sometimes as

corroded micro-phenocrysts ; magnetite, ilmenite(?);

very rare plagioclase; no femics, no quartz.

OTHER INFORMATION: A yellow-brown rock of

localised occurrence.

No. 1127

REMARKS: High water-content due to weathered nature

of rock.

MINERALOGY: Flow-texture. Phenocrysts: Anorthoclase, rare quartz. Groundmass: Glass, anorthoclase;

rare brown hornblende, altered augite; fragments of

basalt, glass; cavities filled with yellow earthy

material.

OTHER INFORMATION: Used in building construction in

Addis Ababa.

No. 1128

MINERALOGY: Flow texture. Phenocrysts: Sanidine.

Groundmass: Glass, abundant sanidine, rare quartz,

no femics.

OTHER INFORMATION: A similar rock from km 5

along the railway is richer in quartz.

REMARKS: MgO trace.
1127

ANORTHOCLASL. TRACHYTE (ULLriFO TUFF) (LEATHERED)

09.01N 38.45E, ADDIS /*HAp,A, SHUA

P. COMUCCI, 1932

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2U5

H2O*

H2UCO2

SO3

TOTAL

ORIGINAL

ANALYSIS

62.68

.99

13.44

5.25

1.00

.15

• 46

2.72

3.C6

4.43

0.00

4.00

2.30

0.00

0.00

0.00

0.00

0.00

0.00

100.48

*ATER-C02-FKEE

(100.0)

66.55

1.05

14.27

5.57

1.06

.16

.49

SI

Tl

AL

FE3

FL2

MN

Mi

CA

NA

K

P

H'f

HC

s

ATOMS

WEIGHT

29.28

.59

7.11

3.67

.78

.12

.28

1.94

2.27

3.68

0.00

.05

.03

0.00

0.00

ATOMS

NUMBERS (100.0)

23.52

.28

5.94

1.49

.31

.05

.26

1.09

2.23

2.12

0.00

MGO/MGO-fFt'O

IN FfcMCS =

ktlGHT NORM

(100.0)

23.42

0.00

27.87

27.56

10.41

0.00

0.00

0.00

0.00

2.63

.24

0.00

0.00

.91

4.96

2.00

0.00

0.00

0.00

0.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

19.61

0.00

28.17

27.86

10.52

0.00

0.00

0.00

0.00

3.50

0.00

8.32

0.00

0.00

0.00

2.02

0.00

0.00

0.00

0.00

C/FM

OZ

3-COMPONENT

WT.PERCfcNTS

F 44.01

37

16

45

29

43

26

.97

.52

.50

.97

.39

.64

1128

COMENuiITIf wELDED

08.58N 38.46E.

P. COMUCCI, 193Z

TUFF

OKI. 5 OF ADDIS ABA9A (QUAKRY bY RAILWAY)

SI02

TI02

AL203

FE2O3

FEO

MNU

MGO

CAO

NA20

tf ? 0

P2U5

H20*

H20-

COi

S03

TOTAL

OKICJMA L

ANALYSIS

71.78

.66

10.29

4.43

1.67

.21

0.00

1.02

3.70

5.37

0.00

.70

. fib

0.00

0.00

0.00

0.00

0.00

0.00

100.69

WATER-C02-FHEE

(100.0)

3.73

5.42

0.00

SI

Tl

AL

FE3

Ft2

MN

Mb

CA

NA

K

P

H*

HC

S

ATOMS

HEIGHT

33.54

.40

5.44

3.10

1.30

.16

0.00

.73

2.75

4.46

0.00

.01

.01

0.00

0.00

ATOMS

NUMHtRS (100.0)

25.44

.18

4.30

1.18

.50

.06

0.00

.39

2.54

2.43

0.00

HEIGHT NORN,

(100.0)

30.26

0.00

32.10

23.17

0.00

0.00

0.00

7.48

0.00

1.56

1.41

0.00

0.00

2.75

O.DO

1.26

0.00

0.00

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVFKTED TO FEO)

29.69

0.00

32.38

23.37

0.00

0.00

0.00

0.00

1.99

4.60

0.00

6.69

0.00

0.00

0.00

1.28

o.oo 0.00

0.00

0.00

SI

AL

FM

C

ALK

K

MG

Tl

P

C/FM

OZ

375

31.7

25.7

5.7

36.8

.49

0.00

2.6

0.00

.22

143

3-COMPONFNT

WT.PERCENTS

F 40.21

37. 68

6.30

56.07

36.67

53.22

10.11

IU FtMCS = 0.00
07.00i< 39.10L, HEAR ,)U>OLA, ARUSS1

E. REP0S51. 1932

SI02

TI02

AL2O3

FE2O3

FFJ

WNO

MGO

CAO

NA2O

K2O

P?O5

H2U*

H2OCO2

SO3

TOTAL

^l< 111 |AL

ANALYSIS

4b.50

2.?8

14.'.2

4.P2

4.03

.14

5.f,5

12.24

3.44

2.M

.tz

2.44

1.04

1.16

0.00

0.00

0.00

0.00

0.00

100.59

hATEK—

47.42

2.38

15.03

5.02

4.20

.15

5.89

12.76

3.59

2.93

.65

C02—FKEE

(100.0)

51

TI

AL

FE3

Ft2

MN

Mlj

CA

NA

K

P

Hf

HC

s

0

ATOMS

«EIGHT

21.26

1.37

7.63

3.37

3.13

.11

3.41

8.75

2.55

2.33

.27

.03

.01

.32

0.00

46.05

ATOMS

NUC.HERS (100.0)

17.45

.66

6.52

1.39

1.30

.05

3.74

5.03

2.56

1.3R

.20

60.73

0

CM

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

IL

TI

PU

AP

CC

MGU/Mt.O*f EO

I IX FEMCS =

V.L1CHT NORM

(100.0)

0.00

U.00

17.13

13.33

16.01

9.05

0.00

0.00

0.00

27.49

o.no

0.00

1.24

7.07

.10

4.45

0.00

0.00

1.40

<;.72

1.00

NON-OXIDATION NORM

(ht2O3 CONVEKTED TO FEO)

0.00

o.oo

17.30

7.72

16.17

12.24

0.00

0.00

0.00

29.27

0.00

0.00

8.65

0.00

0.00

4.50

0.00

0.00

1.41

2.75

.63

N1GGLI

51

AL

FM

C

ALK

K

M6

TI

P

C/FM

QZ

107

20.1

36. 8

3 1. 0

12.1

.-i

.5

4.0

.6

.8

-41

3-COMPONENT

HT.PtRCENTS

F 42.6

M 27.2

A 30.1

F 32.3

C 44.7

A 22.8

N 18.60

K 15.20

C 66.70

No. 1129

REMARKS: Cl trace.

MINERALOGY: Phenocrysts: Corroded aegirine-augite,

less common brown hornblende. Groundmass: Microlites of pyroxene, feldspar/nepheline, and of sodalite(?),

common magnetite; rare vesicles contain natrolite and

calcite.

OTHER INFORMATION: A similar rock from between

Guri and Mio contains pyroxene phenocrysts zoned from

titanaugite to aegirine-augite; also serpentinised olivine

phenocrysts.

No. 1130

MINERALOGY: Groundmass: Abundant zoned labradorite,

common serpentinised olivine (occasionally as phenocrysts), abundant magnetite, rare ilmenite, rare brown

hornblende and biotite.

OTHER INFORMATION: An identical rock occurs in the

Wosho Valley north of Bokoji. Basalt from the Katar

headwaters, north of the Sella di Karra, contains

abundant iddingsitised olivine phenocrysts in a glassy

groundmass.

No. 1131

REMARKS: Weathering shows in water and carbon

dioxide contents Cl trace.

MINERALOGY: Phenocrysts: Uncommon small altered

nepheline, abundant zoned pyroxene (augite out to

aegirine), barkevikite with rims of aegirine-augite.

Groundmass: Nepheline, aegirine-augite, apatite,

titanite rare biotite, sodalite(?); vesicles contain

natrolite-scolecite, calcite.
1130

DOLERITIC BASALT

07.30N 39.16t.

E. RFP0SS1, 1932

hULULLl, S. OF 15OKOJI. ARUSS1

SIU2

TIO2

AL2O3

FE2O3

FFU

MNO

N'GO

CAO

NA2O

K2U

P2U5

H20 +

H2uCO2

S03

TOTAL

OKIKINA L

ANALYSIS

46.99

2.68

18.07

3.21

9.32

.21

5.13

B.'-O

3.91

1.04

.53

• 53

.25

0.00

0.00

0.00

O.OO

0.00

0.00

100.37

WATER-CO2-FRI1E

(100.0)

18.14

3.22

9.36

.21

5.15

8.53

3.93

SI

Tl

AL

FL3

Ft2

MN

MG

CA

NA

K

P

H +

Hc

s

ATOMS

*fcIGHT

21.95

1.61

9.56

2.25

7.24

.16

3.09

6.07

2.90

.66

.23

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

17.34

.74

7.86

.89

2.88

.07

2.83

3.36

2.HO

.49

.17

Q

C1

OR

A^i

AN

NE

LC

AC

N5

CI

HY

OL

MT

HI

1L

TI

RU

A°

CC

MG0/MG0*f-LO

IK Ft I'; K b =

WE.I&HT KOF.-N

(100.0)

0.00

0.00

6.1H

29.27

2b.76

2.17

0.00

0.00

0.00

ii.66

0.00

0.00

13.99

4.6R

0.00

5.11

0.00

0.00

1.16

0.00

.62

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

6.22

25.72

28.93

4.21

0.00

0.00

0.00

8.88

0.00

0.00

19.73

0.00

0.00

5.14

0.00

0.00

1.17

0.00

.4H

111

25.

3-COMPONENT

wT.PERCENTS

F 55.4?

PI 22.69

A 21.89

F 48.23

C 32.72

A 19.05

N 29.07

K 7.73

C 63.20

TI.NGUAITE (nEAI.itKLD SLl.l.TLf)

07.30IN| 40.40E, uETnELP: ,',IJ(-L ANLI MIO,

€. REPObSI, 1932

OF SULK: HUSShIN, ARUSSI

SI02

TI02

AL2O3

FF.2O3

FFO

MNO

MGO

CAO

NA20

K2U

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

47.43

.44

16.83

5.40

4.31

.25

1.76

6.31

7.11

3.00

.66

4.48

1.21

.42

0.00

0.00

0.00

U.00

U.00

99.61

wAT!£k-C02-FH£E

50

18

5

(100.0)

.73

.47

.00

.78

7.60

3.21

SI

TI

AL

FL3

Ft2

MN

MG

CA

NA

K

ATOMS

WEIGHT

22.16

.26

8.90

3.78

3.35

.19

1.06

4.51

5.27

2.49

ATOMS

NUMHERS (100.0)

18.38

.13

7.69

1.58

1.40

.08

1.02

2.62

5.35

1.4H

.11

0.00

0

C'3

OR

AT

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGOtFEO

IN FEhlCS =

»ElCHT r.OKM

(100.0)

0.00

0.00

IB.92

26.74

5.39

20.28

0.00

0.00

0.00

16.50

.37

0.00

0.00

9.35

0.00

.69

0.00

0.00

1.54

1.02

.64

NON-OX I DAT I ON NORM

(FE2O3 CONVEkTED TO FEO)

0.00

0.00

19.13

20.13

5.45

24.25

0.00

0.00

0.00

18.33

0.00

0.00

9.24

0.00

0.00

.90

0.00

0.00

1.55

1.03

.27

ALK

K

MG

TI

P

C/FM

OZ

24.5

.22

.25

.9

.78

.64

-67

3-COMPONENT

WT.PtRCENTS

F 45.00

M 8.16

A 46.85

F 37.16

C 24.15

A 38.69

N 43.30

K 18.27

C 38.43
1132

TINGUAITE nNEPHEL

07.05N 39.42E.

F. REPOSSI, 1932

MT. LAjO, „ . OF CiOuA, ARuSSI

SIO2

TIO2

AL203

FE2O3

FEU

MNu

MGO

CAO

NA2O

If 2 0

P2O5

H20 +

H2UC02

503

TOTAL

0

aOR

AR

AN

NE

LC

AC

NS

DI

WO

HY

OL

<«T

H*l

IL

TI

R:|

AP

ccMGu/MGO+FLU

If* FF-MICS =

ORIGINAL

ANALYSIS

S0»i9

.<>6

20.18

2.49

2.16

• 15

.73

2.23

9.34

4.77

.20

4.94

1.23

.33

0.00

0.00

0.00

0.00

0.00

99.90

»El&HT NORM

(100.0)

0.00

0.00

30.15

23.76

0.00

31.7*

0.00

1.F9

0.00

fc.92

0.00

0.00

.43

2.91

0.00

.93

0.00

0.00

.47

.80

.55

v«ATER-C02-FKtE

(100.0)

54.27

.49

21.61

2.67

2.31

.16

.78

2.39

10.00

5.11

.21

NON-OX 1DAT ION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

30.30

22.69

0.00

32.55

0.00

0.00

.50

7.24

0.00

0.00

4.50

0.00

0.00

.94

0.00

0.00

.47

.HI

.25

SI

Tl

AL

FL3

Ft2

MN

Mo

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

23.68

.28

10.68

1.74

1.68

.12

.44

1.59

6.93

3.96

.09

.06

.01

.09

0.00

48.55

NIGGL1

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

ATOMS

NUMBERS

19.11

8

6

2

13

97

71

68

05

41

90

R3

30

06

59.84

162

38.0

15.7

7.6

38.7

.25

.22

1.1

.27

.49

-91

(100.0)

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

U.I.

23.86

3

72

22

10

(.7

57

29

13

75

4C

15

62

22

lh

19

86.43

No. 1132

REMARKS: High water content.

MINERALOGY: Phenocrysts: Abundant nepheline, with

altered margins (hydrated and carbonated); scarce

corroded biotite, apatite. Groundmass: Phonolitic

texture; nepheline, aegirine-augite, no sodalite, no

iron-oxides.

No. 1133

REMARKS: Repossi gives a summation of 100.48, but

the actual summation of his figures (op. cit. p. 286) is

108.78. Examination of the Niggli values calculated by

Repossi from this analysis reveals that the error lies in

the AlpO- figure. To obtain the published summation,

8. 30% has been subtracted from the published A12O^,

21.15% to obtain 12.85% as given here.

MINERALOGY: Phenocrysts: Labradorite, with ilmenite

inclusions scarce pale-green augite, rare rounded

olivines. Groundmass: Plagioclase, pyroxene, rare

olivine and glass; accessory ilmenite, magnetite, apatite.

OTHER INFORMATION: Repossi discusses basalts from

the Mt. Chilalo and Gasara (Bali) regions under one

heading. This rock is usually cited by later authors

as from Gasara - - see Comucci (1948) and Hieke-Merlin

(1950) - - but a careful reading of Repossi (p. 286)

reveals that Mt. Chilalo is the locality.

No. 1134

REMARKS: SiO^ seems high for the given mineralogy.

MINERALOGY: Phenocrysts: None. Groundmass:

Labradorite, augite, olivine, common magnetite,

scarce glass.
1133

PASALT

E. REpOSSI, 1932

UOUr>TKUL LOCALITY nNEAR MT. CHILALO, ARUSSI«

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2U*

H2UC02

S03

TOTAL

OklGINAl

ANALYSIS

50.92

3.07

12.85

4.33

8.44

.22

5.66

10.78

2.63

.77

.43

.20

.18

0.00

0.00

0.00

0.00

0.00

0.00

100.48

WATER-C02-FKE E

(100.0)

50.87

3.07

12.84

4.33

8.43

.22

5.65

10.77

2.63

.77

.43

SI

Tl

AL

FE3

FE.2

MN

Mb

CA

NA

K

P

H+

HC

S

ATOMS

HEIGHT

23.79

1.84

6.80

3.03

6.56

.17

3.41

7.70

1.95

.64

.19

.00

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

18.80

.85

5.59

1.21

2.61

.07

3.12

4.?7

1.88

.36

.13

HEIGHT NORM

(100.0)

CB

OR

AB

AN

NF

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

R'J

AP

CC

MGO/MfaO*FEO

IN FtMC S =

0.00

4.56

22.27

20.93

0.00

0.00

0.00

0.00

24.38

0.00

V.57

0.00

6.29

0.00

5.S2

0.00

0.00

.94

0.00

.72

NON-OXlDATION NORM

(FE2O3 CONVERTED TO FEO)

.6B

0.00

4.59

22.46

21.11

0.00

0.00

0.00

0.00

25.27

0.00

19.07

0.00

0.00

0.00

5.87

0.00

0.00

.95

0.00

SI

AL

FM

C

ALK

124

18

46

28

7

C/FM

OZ

3-COMPONENT

WT.PEHCENTS

F 58.50

M 75.93

A 15.57

F 47.38

C 40.00

A 12.62

1134

TRACHYBASALT (KECtflT COHE)

OB.33W 39.17E. ADAMA, SHOA

E. REpOSSl, 1932

SI02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA.-0

K20

P2O5

H20*

H20-

C02

S03

TOTAL

OK K. I'ML

ANALYSIS

57.54

1.06

14.40

3.99

6.R2

.13

2.09

4.41

4.49

4.38

.32

.08

.08

0.00

o.no

0.00

o.oo

0.00

0.00

99.79

V«ATER-CO2-F*EE

(100.0)

57.75

1.06

14.45

4.00

6.65

.13

2.10

4.43

4.51

4.40

.32

SI

TI

AL

FE3

FE2

MM

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

26.88

.64

7.62

2.79

5.30

.10

1.26

3.15

3.33

3.64

.14

.00

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

20.93

.?9

6.17

1.09

2.08

.04

1.14

1.72

3.17

2.03

.10

0

CP

OR

AS

AM

NE

LC

AC

NS

DI

WO

HY

OL

MT

HI

IL

TI

RD

AP

CC

MGO/hGO+FEO

IN J-'tl-'.ICb =

FLIGH T NORM

(100.0)

2.21

0.00

26.04

3H.22

6.15

0.00

0.00

0.00

0.00

11.71

0.00

7.13

0.00

5.K2

0.00

2.02

0.00

o.oo

.70

0.00

.47

NON-OXIDATION NORM

(FE2O3 CONVEKTED TO FEO)

0.00

0.00

26.24

38.51

6.20

0.00

0.00

0.00

0.00

12.09

0.00

7.91

6.29

0.00

0.00

2.03

0.00

0.00

.71

0.00

• 29

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 49.66

M 9.60

A 40.74

F 44.87

C 18.31

A 36.8?

N 33.HI

K 32.9H

C 33.21
1135

PANTELLtKITIC wLLOEO TJFF

, OOUS'TFuL LOCALITi (MT. KAKKA, AKUSSI)

F. REpOSSl, 1932

SIU2

TIU2

AL2O3

FE203

FEO

MMO

CAU

NA2O

K2O

P2O5

H2O*

H2OSO3

ANALYSIS

71. 9H

• 36

10.15

5.15

1.78

.14

.16

.22

4.37

5.07

0.00

0.00

0.00

0.00

0.00

0.00

100.34

v,ATER-tO2-FKEE

(100.0)

10.20

5.17

1.79

4.39

5.09

SI

Tl

AL

FE3

Ft2

ATOMS

HEIGHT

33.63

.22

5.37

3.60

1.38

.11

.10

.16

3.24

4.21

0.00

0.00

ATOhS

NUMBERS (100.0)

rvtlCHT NOPM

(100.0)

28.94

0.00

30.19

24.04

0.00

0.00

0.00

11.64

0.00

IL

TI

RU

AP

ccMGO/MGO*FEO

In FEMICS =

.t.9

0.00

0.00

.31

0.00

.21

NON-OXlDATIuN NORM

(FE2O3 CONVERTED TO FEO)

29.82

0.00

30.49

24.28

0.00

0.00

0.00

0.00

3.10

.24

0.00

11.05

0.00

0.00

0.00

.69

0.00

0.00

.31

0.00

.05

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

X.

C

D.I.

41.92

.97

57.11

41.77

1.33

58.90

45.24

52.48

2.28

97.74

No. 1135

MINERALOGY: Green, flow-textured rock. Phenocrysts:

Anorthoclase, scarce quartz. Groundmass: Brown glass

(n 1.510), magnetite and aegirine-augite microlites,

fragments of basalt.

OTHER INFORMATION: Repossi notes the uncertainty

of this locality, and a more likely source for such a

rock-type is either eastern Ghedeb, further south, or

Adama, further north.

No. 1136

MINERALOGY: Phenocrysts: An65, rare serpentinised

olivine. Groundmass: Plagioclase, Fe-rich olivine,

magnetite, altered rose-coloured material; no augite,

no glass.

OTHER INFORMATION: Basalts from:

Abalti: Large augite phenocrysts rimmed with

magnetite, large olivines, small An50, in groundmass

plagioclase, magnetite, glass. Jimma: Zoned phenocrysts, An50 (center) to An70 (rim). Agaro: Zoned

phenocrysts, An70 (center) to An55 (rim), in groundmass

of plagioclase, olivine, augite, magnetite, very rare

glass.

No. 1137

REMARKS: High Fe2O due to weathering(?).

MINERALOGY: Phenocrysts: Sodic labradorite.

Groundmass: Plagioclase, brown hornblende, biotite(?).
1136

OLlVlNE BASALT

07.39N 36.02E. ACHEVO,

P. COrtUCCI. 1933A

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P205

H2O*

H2OCO2

SO3

ORIGINAL

ANALYSIS

48.08

2.P6

17.52

3.37

7.87

.05

5.58

9.17

3.19

1.46

0.00

.64

.P2

0.00

0.00

0.00

0.00

*ATER-C02-FREE

(100.0)

.05

5.63

SI

TI

AL

FE3

FL2

MH

MG

C*

NA

K

P

H+

HC

s

ATOMS

*EIGHT

22.46

1.71

9.27

2.36

6.12

.04

3.37

6.55

2.37

1.21

0.00

.01

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

17.77

.80

7.63

.94

2.44

.02

3.08

3.63

2.29

.69

0.00

0

CH

OR

AB

AN

NF

LC

AC

NS

DI

WO

HY

OL

f»T

H»t

IL

TI

R'J

AP

CC

MG0/M60+FE0

I iM Fthleb =

«E.IGHT NORM

(100.0)

0.00

0.00

b.72

27.28

29.38

0.00

0.00

0.00

0.00

13.45

0.00

.50

10.26

4.94

o.co 5.47

0.00

0.00

0.00

0.00

.72

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

8.78

23.82

29.58

1.97

0.00

0.00

0.00

13.85

0.00

0.00

16.49

0.00

0.00

5.51

0.00

0.00

0.00

0.00

.55

115

24.7

42.0

23.6

9.7

.23

.48

5.2

0.00

.56

-24

3-COMPONENT

rtT.PERCENTS

F

M

A

F

C

A

N

K

C

52.35

25.99

21.66

44.85

36.59

18.56

23.08

10.56

66.35

1137

»GORF ROCK* n^LRSA

08.09U 35.32E.

P. COMUCCI» 1933A

HILL, ;URE, ILUBABOR

SIU2

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2U5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

50.74

2.27

15.31

9.88

5.40

.03

2.66

6.04

3.bB

2.60

0.00

1.00

1.12

0.00

0.00

0.00

0.00

0.00

0.00

100.63

*ATER-C02-FREE

(100.0)

51.51

2.30

15.54

10.03

5.48

.03

Si

TI

AL

FL3

FE2

MN

Mi

CA

NA

K

P

H*

Hc

s

ATOMS

WEIGHT

23.71

1.36

8.10

6.91

4.20

.02

1.60

4.32

2.66

2.16

0.00

.01

.01

0.00

0.00

ATUMS

NUMBERS (100.0)

19.03

.64

6.77

2.79

1.70

.01

1.49

2.43

2.60

1.25

0.00

Q

CB

OR

AB

AN

NE

LC

AC

HS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MG0*FEU

IN FEMICS =

rttlGHT NORM

(100.0)

5.58

0.00

15.63

30.Hl

18.25

0.00

0.00

0.00

0.00

9.53

0.00

2.32

0.00

11.13

2.3S

4.37

0.00

0.00

0.00

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

15.94

31.41

18.60

0.00

0.00

0.00

0.00

10.71

0.00

5.94

12.93

0.00

0.00

4.46

0.00

0.00

0.00

0.00

.29

C

ALK

K

MG

TI

P

C/FM

OZ

17.7

14.0

.i

.2

4.7

0.0

.4

-18

3-COMPONE.NT

WT.PERCENTS

F 63.35

M 11.03

A 25.62

F 55.56

C 21.96

A 22.47

N 29.30

K 21.28

C 49.43
1136

PlCRITIC LASALT

14.58N 43.HE . 45KM E. OF HODEIDA,

P. COMUCCI, 1933B

SIO2

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O +

H2OCO2

SO3

TOTAL

ORIGINAL

ANALYSIS

40.86

3.66

11.54

10.00

4.59

.1<>

11.10

14.28

.76

1.00

0.00

1.97

.16

0.00

0.00

0.00

0.00

0.00

0.00

100.13

WATER-C02-FREE

(100.0)

41.69

3.73

11.78

10.20

4.68

.19

11.33

14.57

.80

1.02

0.00

51

TI

AL

FE3

FE2

MM

Mb

CA

NA

K

P

H*

HC

S

0

ATOMS

HEIGHT

19.09

2.19

6.11

6.99

3.57

.15

6.70

10.21

.58

.83

0.00

.02

.00

0.00

0.00

43.70

ATOMS

NUMBERS (100.0)

15.73

1.06

5.74

2.90

1.48

.06

6.38

5.89

.58

.49

0.00

60.18

NORM SIO2 DEFICIT 0.00

WEIGHT

0

en

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H'-1

IL

TI

RU

AP

CC

0.00

0.00

6.04

3.;?7

25.52

1.P9

U.00

0.00

0.00

36.51

0.00

0.00

7.94

4.94

6.61

7.08

0.00

0.00

0.00

0.00

-1.27

NON-OXIDATION NORM

FE2O3 CONVERTED TO FEO)

0.00

0.00

0.00

0.00

26.02

3.73

4.83

0.00

0.00

39.01

0.00

0.00

20.51

0.00

0.00

7.22

0.00

0.00

0.00

O.OO

NIGGLl

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

79

13

54

29

2

5

0

2

5

7

7

46

59

3

00

55

-32

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

D.I.

53.11

40.41

6.4ft

47.60

46.59

5.81

4.86

6.23

88.97

56.79

IN FEMCS = 1.00

No. 1138

MINERALOGY: Phenocrysts: Large titanaugite, large

colourless Mg-rich divine. Groundmass: Brown glass;

magnetite; microlites of augite and olivine; rare

plagioclase.

No. 1139

MINERALOGY: Phenocrysts: Common large augite,

less common, smaller Mg-rich olivine. Groundmass:

Clear brown glass (more abundant than in 1138), microlites augite and olivine(?).

No. 1140

MINERALOGY: Phenocrysts: Not abundant, large yellow

augite, iddingsitised olivine. Groundmass: Ca-rich

plagioclase, augite; no glass.
1139

PICRITIC hASALT

15.25N 44.11E,

P. COMUCC1, 19330

iM. OF SANA. YE»1EN

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

SO3

TOTAL

OKI&INAL

ANALYSIS

41.30

3.20

13.86

6.86

6.42

.20

8.76

13.44

1.06

1.66

0.00

2.52

.58

0.00

0.00

0.00

0.00

0.00

0.00

99.86

fcATER-C02-FNEE

(100.0)

42.68

3.31

14.32

7.09

6.63

.21

9.05

13.89

1.10

1.72

0.00

SI

TI

AL

Ft 3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

.EIGHT

19.30

1.92

7.33

4.80

4.99

.15

5.28

9.61

.79

1.38

0.00

.03

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

16.05

.94

6.35

2.01

2.09

.07

5.08

5.60

.RO

.82

0.00

5102 DEFICIT 0.00

0

CB

OR

AR

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

k.£lbHT NORM

(100.0)

0.00

0.00

10.16

2.97

29.07

3.42

0.00

0.00

0.00

31.30

0.00

0.00

6.51

10.30

0.00

6.27

0.00

0.00

0.00

0.00

-.18

NON-OXIDATION NORM

(F-E203 CONVERTED TO FEO)

0.00

0.00

0.00

0.00

29.47

5.10

8.08

0.00

0.00

33.26

0.00

0.00

17.93

0.00

0.00

6.36

0.00

0.00

0.00

0.00

MGO/MGO*FEO

IN FEMCS =

C

ALK

3-COMPONENT

WT.PERCENTS

F 53.63

M 35.3H

A 10.99

F 45.11

C 45.65

10.27

H3.17

1140

PICRITIC fc,ASALT

15.08N 43.4t>t. nETWEEN MAFHAQ AND SUK-EL-KAMI5,

P. COMUCCI, 1933L

SIU2

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

S03

TOTAL

OKI&INA L

ANALYSIS

42.64

5.10

10.66

9.07

6.34

.30

7.44

13.06

1.63

.65

0.00

3.21

.38

0.00

0.00

0.00

0.00

0.00

0.00

100.48

WATER-C02-FKLE

44.01

5.26

11.00

9.36

6.54

.31

7.68

13.48

1.68

.67

0.00

(100.0)

SI

TI

AL

Ft3

Ft2

MN

Mt,

CA

NA

K

P

H*

HC

s

ATOMS

HEIGHT

19.92

3.06

5.64

6.34

4.93

.23

4.49

9.33

1.21

.54

0.00

.04

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

16.69

1.50

4.92

2.68

2.08

.10

4.35

5.48

1.24

.32

o.oo

Q

CR

OR

AB

AN

NE

LC

AC

NS

DI

wo

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGOtFEO

IN FEMICS =

WLlGHT NORM

(100.0)

1.21

0.00

3.97

14.26

20.46

0.00

0.00

0.00

0.00

36.23

0.00

2.37

0.00

6.90

4.62

9.99

0.00

0.00

0.00

0.00

1.00

NON-OXIOATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

4.04

9.74

20.83

2.59

0.00

0.00

0.00

39.12

0.00

0.00

13.51

0.00

0.00

10.17

0.00

0.00

0.00

o.oo

.58

c

ALK

3-COMPONENT

WT.PERCENTS

F 61.37

M 29.61

A 9.07

F 50.11

C 42.47

10.63

4.24

85.14
1141

PICRITIC BASAUT

15.24N 44.11E,

p. COWJCC:. i93

2K>". N. OF SANA. YEMtN

SIU2

TIO2

AL2O3

FE2O3

FEO

MNu

MflO

CAu

NA2O

•C2U

P205

H2O*

H2UCO2

SO3

TOTAL

UKIfclNA

ANALY5I

43.30

3.98

12.36

11.49

5.84

.18

6.70

10.81

2.02

L.79

0.00

1.49

• 58

0.00

0.00

0.00

0.00

0.00

0.00

100.54

wATER-C02-FKEE

12

11

5

6

10

2

1

0

.55

.67

.93

.18

.80

.98

.05

.82

.00

51

TI

AL

FL3

FE2

MN

MC

CA

NA

iC

P

H*

HC

s

ATOMS

HEIGHT

20.23

2.39

6.54

8.04

4.54

.14

4.04

7.73

1.50

1.49

0.00

.02

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

16.67

1.15

5.61

3.34

1.88

.06

3.85

4.46

1.51

.86

0.00

0.00

0.00

10.76

17.39

19.63

0.00

0.00

0.00

IL

TI

RU

AP

CC

MGU/MGU+FEO

IN FtMCS =

7.67

0.00

0.00

0.00

0.00

1.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

11.01

6.B5

20.08

5.92

0.00

0.00

0.00

29.82

0.00

0.00

18.47

0.00

0.00

7.84

0.00

0.00

0.00

0.00

.50

NIGGLI

SI

C/FM

OZ

0.00

.49

-33

3-COMPONENT

WT.PERCENTS

F 62.25

M 24.07

A 13.69

C

O.I .

54.24

33.83

11.92

13.8?

12.24

73.94

No. 1141

MINERALOGY: Phenocrysts: Large colourless augite;

equally abundant olivine, serpentinised or occasionally

iddingsitised. Groundmass: Flow-texture; plagioclase,

augite, magnetite; no glass or olivine.

No. 1142

MINERALOGY: Phenocrysts: Augite, uncommon, small

Mg-rich olivine (serpentinised and iddingsitised).

Groundmass: Abundant augite; plagioclase, magnetite;

no glass.

No. 1143

MINERALOGY: Vesicular rock. Phenocrysts: Zoned

brown-red augite, serpentinised olivine. Groundmass:

Labradorite-andesine, augite, abundant magnetite.
PICRITIC BASALT

15.02N 43.49E, 15KM W. OF MAFHAo,

P. COMUCCI, 193311

SIO2

TIO2

AL2O3

FE2O3

FEo

MNO

MGO

CAU

NA20

K2O

P2O5

H2O*

H2OCO2

SO3

TOTAL

ORIGINAL

ANALYSIS

45.52

3.10

10.64

7.44

5.42

.18

11.24

11.14

1.80

1.06

0.00

2.29

.60

0.00

0.00

0.00

0.00

0.00

0.00

100.43

WATER-C02-FREE

uon.oi

46.67

3.18

10.91

7.63

5.56

.IB

11.52

11.42

1.85

1.09

0.00

SI

Tl

AL

F£3

FE2

MN

MG

CA

NA

<

P

H+

HC

S

ATOMS

WEIGHT

21.27

1.86

5.63

5.20

4.21

.14

6.78

7.96

1.34

.88

0.00

.03

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

17.30

.89

4.77

2.13

1.73

.06

6.38

4.54

1.33

.51

0.00

MGO/MGO+FEU

IK FfcMICS =

WEIGHT NORM

(100.0)

0.00

0.00

6.43

15.64

18.24

0.00

0.00

0.00

0.00

30.00

0.00

9.07

4.05

9.34

1.20

6.03

0.00

0.00

0.00

0.00

NON-OX lOAT ION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

6.53

13.47

18.51

1.30

0.00

0.00

0.00

31.80

0.00

0.00

22.27

0.00

0.00

6.12

0.00

0.00

0.00

0.00

0.00

• 44

-25

3-COMPONENT

WT.PERCENTS

F 47.70

M 41.69

A 10.61

F 47.88

C 41.47

A 10.65

1143

OLlVlNE-AUGlTt BASALT

15.ION 43.5fE, TAHAF

P. COMUCCI, 1933B

:RID,L. SUK-tL-KAMS, YEMtN

SIU2

TI02

AL203

FE2O3

FEU

MNO

MGO

CAU

NA2O

K20

P2O5

H2O+

H2OCO2

S03

TOTAL

ANALYSIS

45.56

3.20

11.82

7.15

6.34

.20

9.17

12.30

1.64

1.22

0.00

1.79

.14

0.00

0.00

0.00

0.00

0.00

0.00

100.53

fcATER-C02-FREE

(100.0)

46.21

3.25

11.99

7.25

6.43

.20

9.30

12.47

1.66

1.24

0.00

SI

TI

AL

FE3

Ft2

MN

Mb

CA

NA

<

P

H*

HC

s

ATOMS

WEIGHT

21.29

1.92

6.25

5.00

4.93

.15

5.53

8.79

1.22

1.01

0.00

.02

.00

0.00

0.00

ATOMS

NUMHERS (100.0

17.25

5

2

2

5

4

1

0

91

27

04

01

06

18

99

20

59

00

0

CB

OR

AR

AN

NE

LC

AC

NS

DI

WO

HY

OL

WT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

WEIGHT NOKM

(100.0)

0.00

0.00

7.33

14.10

21.56

0.00

0.00

0.00

0.00

31.61

0,00

7.24

1.47

10,53

0.00

6.16

0.00

0.00

0.00

0.00

.97

NON-OXIDATION NORM

UE203 CONVERTED TO FEO)

0.00

0.00

7.43

10.58

21.86

2.01

0.00

0.00

0.00

33.63

0.00

0.00

18.24

0.00

0.00

6.24

0.00

0.00

0.00

0.00

.63

C/FM

QZ

97

14. 8

52.2

28.0

5.0

.33

.56

3-COMPONENT

WT.

F

M

A

F

C

.PERCENTS

52

35

11

47

42

.86

.93

.21

.09

.93
1144

APHVR1C eASALT

14.57N 43.33E, 3KM N. OF HAjELA,

P. COMUCCI , 1933'J

SIU2

TIU2

AL2O3

FE2O3

FEO

MNU

MGU

CAO

NA2O

K20

P?05

H20*

H2OCO2

SO3

TOTAL

0

ce

OR

A8

AM

N£

LC

AC

NS

DI

MO

HY

OL

HM

IL

TI

R'.l

AP

CC

IN FtMICb =

ORIGINAL

ANALYSIS

50.18

2.68

11.20

12.72

3.42

.21

5.58

10.04

2.05

1.00

0.00

1.16

.26

0.00

0.00

0.00

o.oo 0.00

0.00

100.50

WEIGHT NORM

(100.0)

11.35

0.00

5.98

17.54

18.55

0.00

0.00

0.00

0.00

24.78

0.00

2.57

0.00

4.00

10.10

5.13

0.00

0.00

0.00

0.00

1.00

k,ATER-C02-FREE

(100.0)

50.65

2.70

11.30

12.84

3.45

.21

5.63

10.13

2.07

1.01

0.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

1.64

0.00

6.13

17.9B

19.01

0.00

0.00

0.00

0.00

27.39

0.00

22.59

0.00

0.00

0.00

5.26

0.00

0.00

0.00

0.00

.46

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

<

P

H*

HC

s

0

ATOMS

WEIGHT

23.44

1.61

5.93

8.90

2.66

.16

3.37

7.18

1.52

.83

0.00

.01

.00

0.00

0.00

44.90

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

ATOMS

NUMBERS

18.87

.76

4.96

3.61

1.08

.07

3.13

4.05

1.50

.48

0.00

61.49

122

16.1

51

26

6

4

0

3

4

24

40

9

00

51

-3

(100.0)

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

D.I.

65.16

22.53

12.31

55.22

34.35

10.43

15.66

7.64

76.70

74.31

No. 1144

MINERALOGY: Phenocrysts: Rare labradorite. Groundmass: Chiefly glass with common magnetite, augite

microlites, rectangular "feldspar" crystals replaced

with chalcedony fibres.

OTHER INFORMATION: Collected from 630 m above

Hajela river.

No. 1145

REMARKS: No separate determinations of FeO, H2O-;

TiO_ included in Al-O ; MgO trace.

MINERALOGY: Phenocrysts: Rare small, altered

anorthoclase. Groundmass: Flow-texture; grey glass

with patches of green glass.

OTHER INFORMATION: From Hajela, sanidine

hyalorhyolite, SiO, 75.06%. From Mt. Nekum, San'a,

obsidian, SiO_ 59%.

No. 1146

REMARKS: No separate determinations of FeO, H2O-;

TiOp included in Al^O,; MgO trace.

MINERALOGY: Groundmass: Rather fine-grained,

uniform grain size, quartz and sericitised K-feldspar.

OTHER INFORMATION: From 3 km east of Manaka,

yellow-green rock with iron-stained concentric zoning;

too fine-grained for microscopic resolution; possibly

a glassy alkali rhyolite(?): SiO2 77.94%, R2O3 12.74%

(low in iron), H2O 1.92%, a little CaO, no CO,.
11*5

HYALORHYOLITC:

15.08N 43.46E,

P. COMUCC1, 1933i:

1OK.M N. OF MAFhAk. YEMEN

SIO2

TIO2

AL2O3

FE2O3

FEO

MMO

MGO

CAO

NA20

K2O

P2O5

H2O*

H2OCO2

SO3

TOTAL

OKIGIIJA,

ANALYSIS

73. 2B

0.00

13.66

1.90

0.00

0.00

0.00

.56

3.44

6.18

0.00

1.16

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.18

.ATER-C02-FKEE

(100.0)

74.01

0.00

13.80

1.92

0.00

0.00

0.00

.57

3.47

6.24

0.00

SI

Tl

AL

F£3

FE2

MN

MG

CA

NA

K

P

H*

HC

5

ATOMS

HEIGHT

34.24

0.00

7.23

1.33

0.00

0.00

0.00

.40

2.55

5.13

0.00

.01

0.00

0.00

0.00

ATOHS

NUMBERS (100.0)

25.54

0.00

5.61

.50

0.00

0.00

0.00

.21

2.33

2.75

0.00

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGU/MGO+FEO

IN FEMC S =

WEIGHT NORM

(lon.o)

28.53

.27

36.99

29.48

2.81

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

1.92

0.00

0.00

0.00

0.00

o.oo

0.00

NON-OX IOAT IUN NORM

(FE2O3 CONVEKTED TO FEO)

27.33

.27

37.13

29.56

2.82

0.00

0.00

0.00

0.00

0.00

0.00

2.87

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

421

46.3

8.2

3.5

42.0

• b4

0.00

0.0

0.00

.42

153

3-C0MP0NENT

WT.PERCENTS

F 16.49

33.79

60.71

5.50

1146

TERTIARY M c

15.01N 43.4t

P . COMUCCI,

SIQ2

TI02

AL2O3

FE2O3

FFO

MNO

MGO

CAU

NA20

K20

P2U5

H2U*

H2UC02

S03

TOTAL

ORIGINAL

ANALYSIS

78.84

0.00

11.97

.87

0.00

0.00

0.00

.52

2.43

5.C5

0.00

.88

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.56

V.ATER-C02-FREE

(100.0)

79.09

0.00

12.01

.87

0.00

0.00

0.00

.52

2.44

5.07

0.00

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H.

Hc

s

ATOMS

WEIGHT

36.83

0.00

6.33

.61

0.00

0.00

0.00

• 37

1.80

4.19

0.00

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

27.04

0.00

4.84

.22

0.00

0.00

0.00

.19

1.62

2.21

0.00

WEIGHT NORM

(100.0)

44.27

1.54

30.03

20.69

2.60

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.88

0.00

0.00

0.00

0.00

0.00

IIM FEHICS = 0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

43.75

1.55

30.08

20.72

2.60

0.00

0.00

0.00

0.00

0.00

0.00

1.30

0.00

0.00

o.oo

0.00

o.oo

0.00

0.00

0.00

0.00

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

•568

50.9

4.7

4.0

40.3

.58

0.00

0.0

0.00

.85

307

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

D.I.

10.4?

0.00

89.58

9.81

5.86

R4.33

30.37

63.1?

6.50

LOO.00
1147

OLlVlNE-Au'llTt BASALT

14.00N 42.45E. jE(,EL <"Ui UR IS.

P. COMUCCI, 1933C

SIU2

TIU2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2G

P2Q5

HZU*

H2UCO2

SO3

TOTAL

ORI&lr.A,

ANALYSIS

45.56

3.10

16.28

11.55

1.91

.16

6.01

11.34

2.P7

1.06

0.00

.76

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.60

k.ATEK-CO2-FKEE

45.63

3.10

16.31

11.57

1.91

.16

6.02

11.36

2.87

1.06

0.00

(100.0)

SI

Tl

AL

FE.3

FE2

MN

Mb

CA

NA

K

P

H*

HC

s

0

ATOMS

«EIGHT

21.29

1.86

8.61

8.08

1.48

.12

3.63

8.10

2.13

.86

0.00

.01

0.00

0.00

0.00

44.41

ATOMS

NUMBERS (100.0)

16.R9

.87

7.12

3.23

.59

.05

3.33

4.51

2.06

.50

0.00

60.85

0

CR

OR

An

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

KGU/MCiO-fFEO

IM FEMICS =

WEIGHT NOPM

(100.0)

0.00

0.00

6.29

23.90

28.41

.25

0.00

0.00

0.00

19.69

0.00

0.00

4.13

0.00

11.59

4.39

1.35

0.00

0.00

0.00

1.00

NON-OX I DAT I ON NORM

(FE2O3 CONvFtUED TO FEO)

0.00

0.00

6.43

14.35

29.06

5.72

0.00

0.00

0.00

23.7B

0.00

0.00

14.64

0.00

0.00

6.02

0.00

0.00

0.00

0.00

.55

NlGGLl

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

102

21.

43.

2 7.

7.

5.

0.

-29*

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

57.5?

25.68

16.79

46.85

39.47

13.6ft

No. 1147

REMARKS: H2O- trace.

MINERALOGY: Phenocrysts: Zoned An60 (center) to An30

(rim) large brown-red augite, altered olivine. Groundmass: Flow-texture; labradorite, augite, fresh olivine;

uncommon black glass with magnetite-ilmenite.

No. 1148

REMARKS: Analyst P. Comucci.

MINERALOGY: Phenocrysts: Olivine. Groundmass:

Ophitic, holocrystalline; zoned An70-50; titanaugite,

olivine, scarce magnetite, calcite.

OTHER INFORMATION: From Moga, on the Hafun

Peninsula, North Somali: an erratic boulder of olivine

basalt on the shoreline (note: the nearest land-exposure

of basalt is 250 km to the WNW on the Gulf of Aden coast.

This erratic is presumably derived from the Indian Ocean

floor). Niggli values (the original analysis is not given):

si 92.9, ti 2.6, al 17.3, fm 47, c 30, alk 5.7, mg. 0.56,

k 0. 18. Mineralogy: Fresh olivine phenocrysts in a

medium-grained groundmass of zoned An70-50, olivine,

ophitic titanaugite, uncommon magnetite.

No. 1149

MINERALOGY: Phenocrysts: Andesine-labradorite,

augite, magnetite. Groundmass: Feldspar, hornblende,

nepheline.

OTHER INFORMATION: Specific gravity 2. 564,

published norm inaccurate.
1 1 8

AuGlTE-OLIVlNE BASALT

11.2511 5O.OOE, 15KM

P. ALOISI, 1934

ESF OF KANDALA, N. SOMALI

SIO2

TIO2

AL2O3

FE2O3

Ff.0

MNO

HGO

CAO

NA2O

K2O

P2O5

H2O*

H2OC02

SO3

TOTAL

ORIGI'JAl

ANALYSIS

44.42

1.70

14.05

6.54

5.69

.17

B.44

13.37

2.32

.80

0.00

.P2

.16

1.77

0.00

0.00

0.00

0.00

0.00

100.25

WATER-C02-FNEE

(100.0)

6.71

5.84

.17

8.66

13.71

2.38

.82

0.00

SI

TI

AL

FE3

FE2

MN

Mb

CA

NA

K

P

Ht

HC

S

ATOMS

WEIGHT

20.75

1.02

7.43

4.57

4.42

.13

5.09

9.56

1.72

.66

0.00

.01

.00

.48

0.00

ATOMS

NUMBERS (100.0)

16.89

.49

6.30

1.88

1.81

.05

4.79

5.45

1.71

.39

0.00

IN FEI- ICS =

wLlGHT NORM

(100.0)

4.77

25I7I

0.00

0.00

0.00

0.00

23.59

0.00

.79

H.44

9.57

0.00

3.25

0.00

0.00

0.00

4.06

.92

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

4.83

12.89

26.04

3.89

0.00

0.00

0.00

24.94

0.00

0.00

20.01

0.00

0.00

3.29

0.00

0.00

0.00

4.12

. 6 1

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F 51.41

M 35.4B

A 13.11

F 42.58

C 46.55

A 10.86

N 14.07

K 4.85

C 81.08

1149

PHONOLITIC TRACnYLASALT

10.15iM 35.12E, M . ".Zu-ODO

L. MUHLEN AND J.H . HELL.'iERS,

SIU2

TI02

AL2O3

FE203

FEO

MNU

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

5

TOTAL

ANALYSIS

55.62

.30

17.Bl

1.46

5.49

1.42

.55

^.32

6.89

7.08

.27

.71

.16

.12

0.00

.12

0.00

0.00

0.00

100.32

»tATER-C02-FRtE

(100.0)

56.06

.30

17.95

1.47

5.53

1.43

.55

2.34

SI

TI

AL

FL3

FE2

MN

Mb

CA

NA

k

P

H +

HC

S

ATOMS

WEIGHT

25.99

.18

9.42

1.02

4.27

1.10

.33

1.66

5.11

5.88

.12

.01

.00

.03

0.00

ATOfcS

NUMBtRS (100.0)

20.18

.08

7.62

.40

1.67

.44

.30

.90

4.R5

3.28

.08

0

CR

OR

At)

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGG+hFO

IN FEMICS r

WEIGHT IvORM

(100.0)

0.00

0.00

42.22

17.36

0.00

19.01

0.00

4.26

.35

8.11

0.00

0.00

7.24

U.00

0.00

.57

0.00

0.00

.59

.28

.13

NON-DXIDATIUN NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

42.33

19.95

0.00

17.68

0.00

0.00

1.48

8.15

0.00

0.00

8.94

0.00

0.00

.57

0.00

0.00

.60

.28

.11

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 32.37

42.30

43.46

14.24
1150

PHONOLITL

10.15N 35.12E, HT. B.ELMODO, rfOL

L. MUriLtN AND J.H. HtLLMEKS. 1936

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K2U

P2O5

H20*

H20-

C02

S03

S

TOTAL

0

CB

OR

AB

AN

NE

LC

AC

ORIGINAL

ANALYSIS

56.19

1.42

17.15

1.72

6.48

• 85

.98

3.70

3.C6

6.91

.13

.62

.19

.16

0.00

.17

0.00

0.00

0.00

100.53

(.EIGHT NORM

(100.0)

0.00

0.00

41.12

28.09

9.02

2.60

0.00

0.00

WATER-C02-FKEE

(100.0)

56.53

1.43

17.26

1.73

6.52

.86

.99

3.72

3.88

6.95

.13

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

41.25

26.18

9.05

3.69

0.00

0.00

SI

Tl

AL

Ft3

FE2

MN

Mo

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

26.25

9

1

5

2

2

5

0

85

07

20

04

66

59

64

86

74

06

01

00

04

00

45.34

NIGGLI

SI

AL

FM

C

ALK

K

MG

T

ATOMS

NUMBERS (100.0)

20.53

7

1

1

2

3

39

38

47

98

26

53

45

74

22

04

61.00

180

32.4

2 8 . t

12."

2 6. <

3.<

>

4

6

HM

IL

T!

RU

AP

ccMfiO/MGO*l-Ld

0.00

2.71

0.00

0.00

.29

.37

0.00

6.70

0.00

0.00

9.76

0.00

0.00

2.72

0.00

0.00

.29

.37

3-COMPONENT

WT.PERCENTS

F 41.10

M 4.91

A 53.98

F 36.17

C 16.32

A 47.51

N 26.68

K 47.75

C 25.57

No. 1150

REMARKS: Strongly potassic.

MINERALOGY: Phenocrysts: Plagioclase, nepheline,

some hauyne. Groundmass: Flow-texture; glass, with

andesine and nepheline; rare biotite, magnetite, hornblende, augite, olivine.

OTHER INFORMATION: Specific gravity 2.501.

No. 1151

REMARKS: Republished by Hieke-Merlin (1950) (see this

list no. 1224). Hieke-Merlin has taken 2.00% from FeO

and added it to Fe.O,; has interchanged H~O+ with CO?,

and H,O- with total H,O

MINERALOGY: Recent scoriaceous lava. No mineralogy

given by Gortani and Bianchi. For Hieke-Merlin see 1224.

No. 1152

REMARKS: Analysis republished by Hieke-Merlin (1950),

but allocated to a different locality, (see this list no.

1225). No separate H^O- determination.

MINERALOGY: See 1225.
1151

r'ASALT (SEE 1224)

08.30rt 42.53E, MT. FAR50, DAGAMED O ROAD,

M. GORTANI AND A. iilANCHl , 1937

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H20*

H2OCO2

SO3

TOTAL

ANALYSIS

50.41

2.58

15.94

1.26

11.53

.22

5.02

9.28

2.44

1.12

0.00

.36

.24

0.00

0.00

0.00

0.00

0.00

0.00

100.40

WATER-C02-FKEE

(100.0)

50.51

2.59

15.97

1.26

11.55

.22

5.03

9.30

2.44

1.12

0.00

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

X

P

H*

HC

S

ATOMS

WEIGHT

23.55

1.55

8.43

.88

8.96

.17

3.03

6.63

1.81

.93

0.00

.00

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

18.64

.72

6.95

.35

3.57

.07

2.77

3.68

1.75

.53

0.00

0

CFS

OR

AP

AN

NF

LC

AC

N5

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

IN FtMICS =

WEIGHT NORM

(100.0)

.63

0.00

6.65

20.73

29.26

0.00

0.00

0.00

0.00

14.17

0.00

21.P3

o.oo

1.S3

0.00

4.91

0.00

0.00

0.00

0.00

.50

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

. 6.66

20.78

29.33

0.00

0.00

0.00

0.00

14.28

0.00

21.96

2.06

0.00

0.00

4.92

0.00

0.00

0.00

0.00

.46

124

23.

3-COMPONENT

WT.PERCENTS

F 59.85

M 23.49

A 16.66

F 49.90

C 36.21

A 13.09

N 19.00

K 8.72

C 72.27

1152

APHYRIC BASALT (SEE 12?!>)

D9.16H 41.45E, NEAR E. SUMMIT,

M. GORTANI AND E. BlANClU, 1937

MT. GARAMULATA, HARARG E

SI02

TI02

AL2O3

FE203

FEO

MNU

MOO

CAO

NA20

K20

P2O5

H2U +

H2UC02

S03

TOTAL

ORIGINAL

ANALYSIS

51.02

.98

15.40

2.72

10.21

.19

5.04

H.94

2.73

1.32

.76

1.10

0.00

0.00

0.00

0.00

o.oo 0.00

0.00

100.41

WATER-C02-FRtE

(100.0)

51.37

.99

15.51

2.74

10.28

.19

5.08

9.00

2.75

1.33

.77

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H»

HC

s

ATOMS

WEIGHT

23.84

.59

8.15

1.90

7.94

.15

3.04

6.39

2.03

1.10

.33

.01

0.00

0.00

0.00

ATUMS

NUMBERS (100.0)

18.87

6

3

2

3

1

27

71

76

16

06

78

55

96

62

24

0

CR

OR

An

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

Arc

CC

MGO/MGCHf-LO

IN FtNICS =

WEIGHT NOPM

(100.0)

1.29

0.00

7.87

23.31

26.01

0.00

0.00

0.00

0.00

11.86

0.00

22.13

0.00

3.98

0.00

1.87

0.00

0.00

l.H

0.00

.52

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

7.91

23.43

26.15

0.00

0.00

0.00

0.00

12.06

0.00

22.16

4.72

0.00

0.00

1.88

0.00

0.00

1.68

0.00

.43

MG

TI

P

C/FM

OZ

3-COMPONENT

WT.PERCEhTS

F 58.72

M 22.89

A IB.39

F 49.88

C 34.49

21.02

10.16

68.82
1153

ALKALINE hHYOLITE

13.53N 38.HE , MT. A

G. MEKLft , c . hlMJCCI,

SEITAN, DEMBtGUlNA, TlGRAy

SIO2

TI02

AL203

FET2O3

FEU

MNO

MGO

CAO

NA2O

K?0

P2O5

H2O+

H2OC02

SO3

TOTAL

ORIcINAi

ANALYSIS

72.95

.07

13.85

2.50

• 36

.08

.28

.20

5.49

3.23

.11

.72

.43

0.00

0.00

0.00

0.00

0.00

0.00

100.27

ivATER-C02-FKEE

(100.0)

73.60

.07

13.97

2.52

.36

.06

.28

.20

5.54

3.26

.11

SI

Tl

AL

Ft3

FE2

MN

MG

CA

NA

K

P

H+

HC

S

0

ATOMS

wEIGHT

34.08

.04

7.33

1.75

.28

.06

.17

.14

4.07

2.68

.05

.01

.01

0.00

0.00

49.60

ATOMS

NUMBERS 1100.0

25.22

5

3

1

02

64

65

10

02

14

07

68

43

03

6 2 . 98

0

CR

OR

AR

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

IL

TI

RU

AP

CC

MG0/M60+FEO

IN FENlCS =

wtlCHT NORM

(100.0)

2B.17

1.18

19.31

46.99

.3")

0.00

0.00

0.00

0.00

0.00

0.00

.71

0.00

1.23

1.C.8

.13

0.00

0.00

.24

0.00

1.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

26.26

1.19

19.41

47.22

.35

0.00

0.00

0.00

0.00

0.00

0.00

5.19

0.00

0.00

0.00

.13

0.00

0.00

.24

0.00

.17

NIGGLl

SI

AL

FM

C

ALK

<

HG

Tl

P

C/FM

QZ

395

4 4.

14.

1.

40.

135*

3-COMPONENT

WT.PERCENTS

F 24.11

H 2.36

A 73.5?

F 24.28

C 1.70

A 74.0?

N 61.55

K 36.21

C 2.24

No. 1153

REMARKS: Published summation of 100.32.

No. 1154

MINERALOGY: Phenocrysts: An50 (not zoned), fresh

olivine (1/2-mm diameter), rather uncommon. Groundmass: Labradorite, titanaugite, olivine, magnetite (some

large crystals), apatite; no glass.

OTHER INFORMATION: Comucci (1933a) refers to a

specimen from this vicinity which contained zoned An60

phenocrysts.

No. 1155

REMARKS: MnO trace.

MINERALOGY: Phenocrysts: Anorthoclase (could be

sanidine) cossyrite. Groundmass: Glass (n = 1.510),

quartzo-feldspathic aggregates, accessory riebeckite,

more common than aegirine.
1154

OLIVINE BASALT

07.39N 36.49E.

G. PAGLIANI, 1940

AIRFltLD, KAFFA

SI02

TIU2

AL203

FE2O3

FEO

MNU

MGO

CAO

NA20

K20

P2O5

H20+

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

42.94

1.69

16.88

2.BO

7.14

.30

10.46

11.98

3.79

1.13

0.00

.97

.40

0.00

0.00

0.00

0.00

0.00

0.00

100.48

WATER-C02-FWEE

(100.0)

43.33

1.71

17.03

2.B3

10.55

12.09

3.82

SI

Tl

AL

FE3

Ft2

MN

MG

CA

NA

K

P

H+

Hc

s

ATOMS

*ElGHT

20.06

1.01

8.93

1.96

5.55

.23

6.31

8.56

2.81

.94

0.00

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

15.88

.47

7.36

.78

2.21

.09

5.78

4.75

2.72

.53

0.00

NORM SI02 DEFICIT 0.00

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

I-W

IL

TI

RU

AP

CC

MGO/MGO+FLO

IN FtflCS =

WtlGHT KOHM

(100.0)

0.00

0.00

3.73

0.00

2b. 89

17.56

2.37

0.00

0.00

27.39

0.00

0.00

15.72

4.10

0.00

3.23

0.00

0.00

0.00

0.00

8C

-.68

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

0.00

0.00

26.03

17.65

5.32

0.00

0.00

27.95

0.00

0.00

20.48

0.00

0.00

3.25

0.00

0.00

0,00

0.00

.69

c

ALK

C/FM

QZ

3-COMPONENT

WT.PtRCENTS

F 39.26

M 41.31

A 19.43

F 37.03

C 44.63

A 18.33

N 22.43

IC 6.69

C 70.89

1155

PANTELLERITE (t>RFY-6REErn

07.41N 36.53E, 6K>' E. OF JlMMA,

G. PAGLIAN1, 1940

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MSO

CAO

NA2O

K2O

P2O5

H2O+

H2OCO2

SOi

TOTAL

ANALYSIS

68. 58

.49

8.43

4.67

4.80

0.00

.20

.66

6.86

3.45

0.00

1.59

.60

0.00

0.00

0.00

0.00

0.00

0.00

100.33

WATER-C02-FKEE

(100.0)

69.88 SI

Tl

AL

FE3

FE2

MN

Mo

CA

NA

<

P

H*

rlC

5

ATOMS

WEIGHT

32.04

.29

4.46

3.27

3.73

0.00

.12

.47

5.09

2.86

0.00

.02

.01

0.00

0.00

ATOMS

NUMHERS (100.0)

24.73

.13

3.58

1.27

1.45

0.00

.11

.26

4.80

1.59

0.00

Q

cn

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H'l

IL

TI

RU

AP

CC

MGO/MGO+FEO

IU FEMICS =

WEIGHT NORM

(100.0)

25.32

0.00

20.83

24.58

0.00

0.00

0.00

13.81

4.43

2.95

0.00

7.13

0.00

0.00

0.00

.95

0.00

0.00

0.00

0.00

.08

NON-OX I DAT I ON NORM

(FE2O3 CONVEKTED TO FEO)

27.73

0.00

21.02

24.80

0.00

0.00

0.00

0.00

8.15

2.99

0.00

14.34

0.00

0.00

0.00

.96

0.00

0.00

0.00

0.00

.04

0.00

.09

100

3-COMPONENT

WT.PERCENTS

47.40

1.00

51.60

46.33

62.53

31.45

6.0?
1156

PANTELLERITE (CLJE)

G. PA&LlAnl. 1940

SI02

TI02

AL203

FE2O3

F E J

MNO

MGO

CAJ

NA2O

K2O

P2O5

H2U*

H20-

C02

SO3

TOTAL

AMALYS1

72.16

0.00

10.06

4.94

1.2B

0.00

^ 7

.48

5.2b

4.65

0.00

.76

.42

0.00

0.00

0.00

0.00

0.00

o.oo

100.60

*ATER-C02-FKEE

(100.0)

72.58

0.00

10.12

4.97

1.29

0.00

.57

.48

5 . 31

4.68

0.00

SI

TI

AL

Ft3

Ft2

MN

Mfc,

CA

NA

•ft

<|-

ATOMS

..EIGHT

33.71

0.00

5.32

3.46

.99

0.00

.34

.34

3.92

3.86

0.00

.01

.00

0.00

0.00

ATOMS

NIMHERS (100.0)

25.34

0.00

4.16

1.31

.38

0.00

.30

.18

3.60

2.08

0.00

0

Cft

OR

AT

AN

NF

LC

AC

NS

DI

MO

HY

CL

"T

hH

IL

TI

RU

AM

CC

MGO/MGO+KF:o

hfcltHT W<M

(100.0)

26.47

0.00

27.72

25.96

0.00

0.00

0.00

14.42

.63

2.02

0.00

2.78

0.00

0.00

0.00

0.00

0.00

0.00

0.00

o.oo

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

28.99

0.00

27.98

26.21

0.00

0.00

0.00

0.00

4.49

2.12

o.oo 10.21

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

NIGbLl

SI

AL

FM

cALK

K

MG

TI

P

C/FM

QZ

357

29.4

28.0

2.6

40.1

.37

.15

0.0

0.00

.09

129

3-COMPONENT

WT.PtHCENTS

F 37.20

M 3.41

A 59.39

F 37.40

50.7?

44. 6?

No. 1156

REMARKS: TiO2 trace.

MINERALOGY: Phenocrysts: Rounded anorthoclases.

Groundmass: Quartz-anorthoclase, common riebeckite

(no aegirine); accessory biotite, magnetite; no cossyrite.

No. 1157

REMARKS: TiO2 trace.

MINERALOGY: Anorthoclase. Groundmass: Quartzanorthoclase, no femics, extremely fine-grained

yellowish background material.

No. 1158

REMARKS: TiO^ and MnO traces; no separate H2Odetermination.

MINERALOGY: Very similar to Jimma pantellerites

(1155-7). Phenocrysts: Anorthoclase. Groundmass:

Quartz-anorthoclase, minute aegirine, rare cossyrite;

calcite-lined vesicles.
1157

PANTELLEHITL (VVHITC)

G. PAt.LIAM» 19*0

SI02

TI02

AL2O3

FE2O3

FEU

MNO

MGO

CAO

NA20

K20

P205

H20*

H2uC02

S03

TOTAL

OKItlNAi

ANALYSIS

72.19

0.00

9.80

4.98

1.29

0.00

.4

. bi

5.R

4.5<

0.0(

• 7i

.4

0.00

0.00

0.00

0.00

0.00

0.00

100.7ft

PER—C02—FHEE

(100.0)

.45

.00

.84

.00

.29

.00

.43

.54

.84

.61

.00

SI

Tl

AL

Ffc3

Ft2

MN

MG

CA

NA

K

P

Ht

HC

s

ATONIS

wEI&HT

33.73

0.00

5.19

3.48

1.00

0.00

.26

.39

4.32

3.81

0.00

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0

25.30

0.00

4.05

1.32

.38

0.00

.22

.20

3.96

2.05

0.00

0

CB

OR

AS

AN

NE

LC

AC

NS

01

WO

HY

OL

MT

HI

IL

TI

R'J

AP

CC

MGO/MGO+FEO

IN FtMCS =

WClGHT NORM

(100.0)

26. 81

0.00

27.30

24.90

0.00

0.00

0.00

14.50

1.91

2.29

0.00

2.30

0.00

0.00

0.00

0.00

0.00

0.00

u.oo

0.00

.37

NON-OXIDATION NORM

(FE203 CONvF.KTED TO FEO)

29.35

0.00

27.56

25.14

0.00

0.00

0.00

0.00

5.79

2.39

0.00

9.76

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

.13

NlGGLl

SI

AL

FM

C

ALK

353

26

26

2

42

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 36.65

53.15

41.92

4.93

1158

PANTELLtKlTIC nELLLD TUFF

08.28 K 39.09E. KOKA, A*ASH. SHOA

G. PAoLlAMt 1940

SI02

TI02

AL2O3

FE203

FEO

MNO

CAO

NA20

K2U

P205

H20 +

H20-

CO2

S03

TOTAL

ANALYSIS

72.ee

0.00

10.12

6.15

1.09

0.00

.64

6.00

2.f4

0.00

.42

0.00

0.00

0.00

u.oo

0.00

0.00

0.00

100.38

!iATER-C02-FK£E

(100.0)

72.91

0.00

10.12

6.15

1.09

0.00

.54

.64

6.00

2.54

0.00

SI

Tl

AL

Ft3

FE2

MN

M6

CA

NA

<

P

H»

HC

S

ATOMS

WEIGHT

34.05

0.00

5.35

4.30

.85

0.00

.33

.46

4.45

2.11

0.00

.00

0.00

0.00

0.00

ATOMS

NUMBERS I 100.0)

25.36

0.00

4.15

1.61

.32

0.00

.28

.24

4.05

1.13

0.00

0

CT

OR

AF)

AN

NE

LC

AC

NS

DI

wo

HY

OL

MT

H'^

IL

TI

RU

AP

CC

MjO/MCiOtFKO

IN FEI,ICb' =

'HEIGHT KOPM

(100.0)

29.50

0.00

15.06

37.91

0.00

o.co

0.00

11.46

0.00

2.51

0.00

.35

0.00

3.20

0.00

0.00

0.00

0.00

0.00

0.00

.91

NON-OX I DM T I ON NORM

<FE2O3 COHVEKTE D TO FEO)

29.31

0.00

15.24

38.37

0.00

0.00

0.00

0.00

3.06

2.82

o.oo

11.20

0.00

0.00

0.00

0.00

0.00

0.00

0.00

o.oo

.14

TI

/FM

3-COMPONENT

WT.PERCENTS

F 44.36

M 3.31

A 52.33

F 44.09

C 3.90

A 52.01

N 65.36

K 27.67

C 6.97
1159

VITRIC wtLt)tL> TUFF

08.57U 39.45E* h

0. HIEKt, 1941

j ILO-"fcTAHARA RAILwAy, SHuA

SIU2

T1O2

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20+

H20-

C02

SO 3

CL

F

TOTAL

ORIGINAL

ANALYSIS

67.96

.46

7.04

7.73

1.32

.22

.88

2.00

7.04

4.77

0.00

.21

.20

0.00

0.00

.20

.05

0.00

0.00

100.08

hATER-C02-FREE

(100.0)

68.36

.46

7.08

7.78

1.33

.22

.89

2.01

7.08

4.80

0.00

SI

Tl

AL

Ft3

FE2

MN

Mt

CA

NA

-It

HATOMS

WEIGHT

31.75

.28

3.72

5.41

1.03

.17

.53

1.43

5.22

3.96

0.00

.00

.00

0.00

0.00

ATOMS

NUhRERS (100.0)

24.31

.12

2.97

2.08

.40

.07

.47

.77

4.89

2.18

0.00

0

o.\

OR

AR

AN

NE

LC

AC

NS

DI

WO

HY

OL

^T

HM

IL

TI

R1J

AP

CC

MGO/MGO+HEO

IN FL>,ICS =

ULlGHT MORii

(100.0)

24.24

0.00

28.42

9.65

0.00

0.00

0.00

22.55

S.77

8.26

0.00

.22

0.00

0.00

0.00

.88

0.00

0.00

0.00

0.00

.58

NON-OXIDATION NORM

(FE2O3 CONVEKTED TO FEO)

28.18

0.00

28.86

9.80

0.00

0.00

0.00

0.00

11.91

8.86

0.00

11.52

0.00

0.00

0.00

.89

0.00

0.00

0.00

0.00

.18

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

az

276

16.t)

34.3

8.7

40.2

.31

.16

1.4

0.00

.25

85

3-C0MP0NENT

WT.PERCENTS

F 41.63

M 4.05

A 54.32

F 39.59

C 8.75

A 51.66

N 50.98

K 34.54

C 14.4H

No. 1159

REMARKS: P2O5 absent.

MINERALOGY: Phenocrysts: Anorthoclase, zoned

aegirine-augite, cossyrite. Groundmass: Spherulitic

and fluidal glass, rare magnetite, fragments of trachyandesite (bearing augite with arfvedsonite rims) and

trachyrhyolite.

No. 1160

REMARKS: P ^ trace.

MINERALOGY: Phenocrysts: Micro-phenocrysts of

anorthoclase and aegirine-augite. Groundmass: Finely

vesicular glass, feldspathic microlites, cossyrite.

OTHER INFORMATION: Occurs as schlieren in 1159.

No. 1161

MINERALOGY: Ophitic texture: zoned labradorite and

titanaugite, both in large crystals. Common limonitised

magnetite.

OTHER INFORMATION: Occurs in a laccolith, where this

rock-type grades into orthoclase gabbro (see 1164).
1160

PANTELLERITI C OtiSlDlAN (FKOM rtlTHlN TUFF 1159)

08.57N 39.45E, MALK A JILO-KETAHARA RAILWAY* SHOA

0. HIEKE. 1941

SI02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2U

P2O5

H2O*

H2UCO2

SO3

OL.

F

TOTAL

ANALYSIS

68.00

.38

7.38

3.98

4.55

.24

.75

2.04

7.83

4.73

0.00

.13

.10

0.00

0.00

• 24

.13

0.00

0.00

100.48

WATER-C02-FKEE

(100.0)

68.08

.38

7.39

3.98

7.84

4.74

0.00

SI

TI

Al_

Ft3

Ft2

MN

Mb

CA

NA

K

P

H +

HC

5

ATOMS

WEIGHT

31.77

.23

3.90

2.78

3.54

.19

.45

1.46

5.81

3.93

0.00

.00

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

24.22

.10

3.10

1.07

1.36

.07

.40

.78

5.41

2.15

0.00

0

crc

OR

AB

AN

NE

LC

AC

NS

01

WO

HY

OL

MT

HH

IL

TI

P'J

AP

CC

MGO/MGO+F-tO

IN FLMICS =

KtlCiHT NORM

(100.0)

24.03

0.00

28.06

11.58

0.00

0.00

0.00

1 1. *>b

9.73

8.79

0.00

5.53

0.00

0.00

0.00

.72

0.00

0.00

0.00

0.00

.23

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

26.03

0.00

28.27

11.67

0.00

0.00

0.00

0.00

12.88

8.96

0.00

11.46

0.00

0.00

0.00

.73

0.00

0.00

0.00

0.00

.15

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

uz

268

17.2

32.2

8.7

42.0

.28

.14

1.1

0.00

.27

75

3-COMPONENT

WT.PERCENTS

F 39.06

M 3.43

A 57.51

F 36.88

C 8.8?

A 54.30

C

U.I.

53.63

32.40

13.97

1161

COARSL UASALT (GABtlRD)

13.10M 39.HE . MAUL. MAJ FARASH.

F. ROUOLICO, R. PltRUCCIM , 1942

SI02

TIU2

AU203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

OklGINAt

ANALYSIS

4b.04

2.96

14.78

4.95

8.47

.15

5.11

10.94

3.27

2.16

.32

1.51

.81

0.00

0.00

0.00

0.00

0.00

0.00

100.47

HATER-C02-FKEE

(100.0)

15.06

5.04

8.63

.15

5.21

11.15

3.33

2.20

.33

SI

TI

AL

FE3

FtZ

MN

MG

CA

NA

<

P

H*

HC

S

ATOMS

WEIGHT

21.04

1.77

7.82

3.46

6.58

.12

3.08

7.82

2.43

1.79

.14

.02

.01

0.00

0.00

ATOMS

NUrtBERS (100.0)

17.15

.85

6.63

1.42

2.70

.05

2.91

4.47

2.42

1.05

.10

0

CR

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGU/MGO + f-EO

lu FkhlCS =

fctlGHT NOWI»

(100.0)

0.00

0.00

13.03

13.06

19.58

8.22

0.00

0.00

0.00

27.51

0.00

0.00

4.F3

7.33

0.00

5.72

0.00

0.00

.71

0.00

.71

NON-OXIDATIUN NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

13.16

7.32

19.78

11. 48

0.00

0.00

0.00

28.68

0.00

0.00

13.09

0.00

0.00

5.78

o.oo 0.00

.72

0.00

.48

C/FM

QZ

103

20.0

3-COMPONENT

WT.PERCENTS

F 56.01

M 71.33

A 22.66

F 45.05

C 36.72

A 18.23

N 19.9R

K 13.19

C 66.83
1162

OLIVlHE BASALT i;VKfc'

13.0*1% 39.01E. FEP'AXOA. TICRAY

F. ROOOLICO. H. V'ltRUCClNl, 1942

SIu2

TI02

AL2O3

FE203

FEU

MNU

KGO

CAD

NA20

K2U

P2U5

H20*

H20-

C02

503

TOTAL

ORI&IliAi.

ANALYSIS

45.38

1.83

13.79

3.99

S.47

.10

8.38

11.70

2.21

2.07

.41

1.P5

• <>7

0.00

O.CO

0.00

0.00

0.00

0.00

100.65

WATER-C02-FREE

(100.0)

46.15

1.86

14.02

4.06

8.61

.10

8.52

11.90

2.25

2.11

.42

SI

Tl

AL

Ft3

FE.2

MN

MG

CA

NA

K

P

H*

HC

S

0

ATOMS

WEIGHT

21.20

1.10

7.30

2.79

6.58

.08

5.05

8.36

1.64

1.72

.18

.02

.01

0.00

0.00

44.62

AT0M5

NUMBERS (100.0)

17.15

.52

6.1'

1.1'

2.6i

.0

4.7

4.7'

1.6<

1.00

.13

60.12

0.00

0.00

12.47

9.52

21.92

5.17

0.00

0.00

0.00

26.08

0.00

O.CO

12.52

5.90

0.00

3.53

0.00

O.00

flORM

(100.0)

If-. FullS -

NON-OXIDATION NORM

(HE2O3 CONVERTED TO FEO)

0.00

0.00

12.56

4.88

22.09

7.76

0.00

0.00

0.00

28.89

0.00

0.00

19.34

0.00

0.00

3.56

0.00

0.00

• 92

0.00

.60

c

ALK

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 49.60

M 33.36

A 17.04

F 43.HI

C 41.14

A 15.05

N 13.83

K 12.95

C 73.22

No. 1162

MINERALOGY: Ophitic diabasic texture. G.roundmass:

Zoned An.70 (center) to An45 (rim); abundant titanaugite;

abundant magnetite, also as inclusions in plagioclase;

talc-chlorite after olivine.

No. 1163

REMARKS: Published summation is 100.96.

MINERALOGY: Aphanitic, semi-ophitic texture.

Groundmass: An65, titanaugite, fresh olivine (large

negative optic angle) all in equal abundance; much

magnetite, minute apatite.

No. 1164

REMARKS: CO2 trace. Highly potassic rock.

MINERALOGY: Medium-grained, ophitic texture.

Groundmass: Fresh An65-70, Sericitised orthoclase,

abundant augite; rare biotite, apatite, magnetite, ilmenite,

pyrite; cavities with quartz and calcite.

OTHER INFORMATION: Occurs in laccolith, where it

grades into rock-type 1161.
1163

OLIVINE BASALT DYK.L

13.0711 39.05E, SESSEUA, A^ATIL A FORT, W. OF SA.iRE. TIGftAY

F. ROOOLICO, R. PItRUCCiNt, 1<J42

SI02

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

SO3

TOTAL

ANALYSIS

46.02

1.97

18.OR

2.87

9.76

.14

4.68

12.40

2.74

1.52

.26

.33

.14

0.00

0.00

0.00

0.00

0.00

0.00

100.91

WATEH-CO2-FKEE

(100.0)

45.82

1.96

18.00

2.86

9.72

.14

4.66

12.35

2.73

1.51

.26

SI

TI

AL

FL3

Ft2

MN

M6

CA

NA

K

P

H*

HC

S

ATOMS

•EIGHT

21.50

1.18

9.57

2.01

7.59

.11

2.82

8.86

2.03

1.26

.11

.00

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

17.03

7

3

2

4

1

55

89

80

03

04

59

92

97

72

08

0

CB

OH

AO

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

IL

TI

RU

AP

CC

MGO/MGO+KEO

IN FEMICS i

WEIGHT NORM

(100.0)

0.00

0.00

8.96

11.86

32.36

6.10

0.00

0.00

0.00

22.«0

0.00

0.00

9.47

4.15

0.00

3.72

0.00

0.00

.57

0.00

.55

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

9.01

8.62

32.54

7.93

0.00

0.00

0.00

23.26

0.00

0.00

14.34

0.00

0.00

3.74

0.00

0.00

.57

0.00

.44

C/FM

OZ

3-C0MP0NENT

WT.PERCENTS

F 58.55

M 21.70

A 19.75

F 43.12

C 42.34

A 14.54

N 16.45

K 9.12

C 74.43

1164

ORTHOCLASE bAB

13.ION 39.11E.

F. ROiX>Ll(.O, R

MAI FARASm n. OF SAMREi

ItRUCCI'jI, 1942

5102

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAU

NA20

<20

P2O5

H20+

H20-

C02

S03

S

-0

TOTAL

ANALYSIS

46.13

2.07

IB.54

1.53

6.32

.09

7.43

5.76

1.75

6.17

.57

2.P6

• 74

0.00

0.00

.33

o.no

0.00

-.16

100.13

TER-C02-ctftE

(100.0)

.87

.15

.24

.59

.56

.09

.71

.98

.62

.40

.59

SI

Tl

AL

FE3

FL2

Mil

Ml)

CA

NA

K

P

H +

HC

s

ATOMS

•EIGHT

21.55

1.24

9.81

1.07

4.91

.07

4.48

4.12

1.30

5.12

.25

.03

.01

0.00

0.00

ATOMS

NUnfltHS (100.0)

17.43

.59

8.26

• 44

2.00

.03

4.19

2.33

1.28

2.98

.18

WEIGHT NORM

(100.0)

0.00

0.00

37.93

2.28

25.38

7.11

0.00

0.00

o.oo

.69

0.00

0.00

18.94

2.31

0.00

4.OH

0.00

0.00

1.29

0.00

let FtMCv = .77

NON-OXIDATION NORM

(FE2O3 cONVFKTEr TO FEO)

0.00

0.00

38.04

.45

25.45

8.12

0.00

0.00

0.00

.70

0.00

0.00

21.84

0.00

0.00

4.09

0.00

0.00

1.30

0.00

.70

SI

AL

FM

C

ALK

3-COMPONLNT

WT.PtRCENTS

F 33.84

M 32.03

A 34.14

F 36.46

C 26.75

A 36.79

N I?.79

K 45.10

C 42.11
1165

OLlVlNE BASALT (LACCOLIT rARclN)

13.12IM 39.22E, ADI GULAaUL. E. OF SAMRL, TIuRAY

F. RODOLICO, K. PIERUCCIMI, 1942

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2U

P2O5

H2O+

H2OC02

SO3

TOTAL

ORIOINA L

ANALYSIS

46.89

1.2ft

12.63

1.67

9.52

.10

U.P7

11.04

2.18

1.75

• 2B

.89

.33

0.00

0.00

0.00

0.00

0.00

0.00

100.43

i«ATER-C02-FREE

(100.0)

47.26

1.29

12.73

1.68

9.60

.10

11.96

11.13

2.20

1.76

.28

SI

Tl

AL

Ft3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

0

ATOMS

(.EIGHT

21.91

.77

6.68

1.17

7.40

.08

7.16

7.89

1.62

1.4!i

.12

.01

.00

0.00

0.00

44.17

ATOMS

NUMBERS (100.0

17.38

5

2

6

4

1

36

52

47

96

03

57

39

57

R3

09

59. 86

0

CE(

OP

AB

AN

NF

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

ccMGO/MGO+FEO

IN FEHICS =

WtlGHT NORM

(1OO.0)

0.00

0.00

10.44

9.75

19.63

4.81

0.00

0.00

0.00

27.52

0.00

0.00

22.3*

2.45

0.00

2.45

0.00

0.00

.62

0.00

.73

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

10.48

7.83

19.69

5.88

0.00

0.00

0.00

27.80

0.00

0.00

25.24

0.00

0.00

2.46

0.00

0.00

.62

0.00

.68

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

94

15.

54.

23.

6.

1.

-32

3-COMPONENT

WT.PERCENTS

U.46

13.9H

14.56

2.7R

2.20

15.0?

14.56

11.69

73.75

NO. 1165

MINERALOGY: Black, fine-grained, ophitic rock.

Groundmass: Poorly zoned An58-55 (very rarely

phenocrysts), abundant large augite, small green olivines,

common large magnetite, rare limonite and apatite.

OTHER INFORMATION: Occurs at margin of large

laccolith.

No. 1166

MINERALOGY: Fine-grained. Phenocrysts: Microphenocrysts of zoned An70 (center) - An35 (rim).

Groundmass: Labradorite; fresh olivine (large negative

optic angle) with incipient alteration, diopside-augite

as common as olivine; rare biotite associated with

magnetite (coarse-grained); rare apatite.

No. 1167

REMARKS: Published summation is 100.33. CI trace.

MINERALOGY: Very fine-grained, aphanitic, grey rock.

Groundmass: Flow-texture; orthoclase (also some phenocrysts) and slightly subordinate nepheline, rather

uncommon aegirine-augite with aegirine rims, rare

muscovite (katapleite?); no observed sodalite, lavenite,

or wohlerite.

OTHER INFORMATION: Specific gravity 2.57. This

rock-unit has flowed out on the Antalo Limestone.
1166

OLlVlNE BASALT (INTRUSIVE)

13.3ON 39.33E, MT. OUIHA,

F. ROUOLICO, R. PIERUCCIMi

E. OF OUIHA, TlGRAY

SI 02

TIOZ

AL2O3

FE2O3

FEO

MNO

MGU

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

47.25

2.57

11.39

4.99

12.03

.13

5.66

9.60

3.19

2.35

.63

.83

.34

0.00

0.00

0.00

0.00

0.00

0.00

100.96

WATER-C02-FREE

(100.0)

47.35

2.58

11.41

5.00

12.06

.13

5.67

9.62

3.20

2.35

.63

SI

Tl

AL

F£3

FL2

MN

M'o

CA

NA

K

P

H +

HC

S

ATOMS

WEIGHT

22.08

1.54

6.03

3.49

9.35

.10

3.41

6.86

2.37

1.95

.27

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0

17.69

5

1

3

3

3

2

1

73

08

42

82

04

20

90

34

14

20

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H'-1

IL

TI

R:J

At'

CC

MGO/MGO+FE0

IN FtMICS =

WEIGHT NORM

(100.0)

0.00

0.00

13.94

20.21

9.79

3.73

0.00

0.00

0.00

28.38

0.00

0.00

10.41

7.26

0.00

4.89

0.00

0.00

1.38

0.00

.57

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

14.08

14.59

9.89

6.91

0.00

0.00

0.00

29.24

0.00

o.oo

18.95

0.00

0.00

4.93

0.00

0,00

1.39

0.00

.42

C/FM

UZ

3-COMPONENT

WT.PERCENTS

F 60.31

M 20.06

A 19.63

F 52.9?

C 29.85

A 17.23

N 21.07

K 15.52

C 63.41

1167

T1NGUAITE

I3.26N 39.09E, IXJrtoANI pASS,

F. RODOLICO, R. PIERUCCINI, 19<,

SA.MftE-ABfil AD01 ROAD, TlGRAy

SI 02

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2U5

H20 +

H20-

C02

S03

TOTAL

OKItlNAL

ANALYSIS

59.92

.30

16.73

3.33

.43

.18

.57

1.58

9.26

6.35

.03

1.18

.11

0.00

.33

0.00

0.00

o.oo 0.00

100.30

WATER-C02-FKEE

60.72

.30

16.95

3.37

• 44

.18

.58

1.60

9.38

6.43

.03

(100.0)

SI

TI

AL

FL3

FL2

MN

MG

CA

NA

<

P

H.

HC

s

ATOMS

WEIGHT

27.99

.18

8.85

2.33

.33

.14

.34

1.13

6.87

5.27

.01

.01

.00

0.00

.13

ATOMS

NUMBERS (100.0)

21.28

.08

7.00

.89

.13

.05

.30

.60

6.38

2.88

.01

0

CB

OR

AB

AN

NF.

LC

AC

NS

DI

woHY

OL

MT

HM

IL

Tl

RU

AP

CC

MGO/MGO*FEO

IN FEHICS =

WEIGHT NORM

(100.0)

0.00

0.00

38.12

31.25

0.00

10.e7

0.00

9.79

4.00

4.32

1.02

0.00

o.oo 0.00

0.00

.58

0.00

0.00

.07

0.00

. .75

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

38.37

36.75

0.00

8.07

0.00

0.00

6.62

6.76

0.00

0.00

2.78

0.00

0.00

.58

0.00

0.00

.07

0.00

.25

C/FM

OZ

210

34.6

13.6

3-COMPONENT

WT.PERCENTS

F 18.86

53.87

36.94

9.19
1168

BASALT

09.0AH 35.2«E»

P. COMUCCI, 1948

KARTA-<FLLA CONFLUENCE, WOLLEGA

5IU2

TI02

AL203

FE2O3

FEO

MNU

MGO

CAU

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

OK 101HAL

A/iALYSIS

46.18

3.07

13.12

4.26

10.33

.19

5.73

a.07

3.36

2.10

.64

2.29

.90

0.00

0.00

0.00

0.00

0.00

0.00

100.24

WATER-C02-FKEE

47.58

3.16

13.52

4.39

10.b4

.20

5.90

8.32

3.46

2.16

.66

(100.0)

SI

Tl

AL

Ffc3

Ft2

MN

MO

CA

NA

K

P

H»

HC

s

0

ATOMS

HEIGHT

21.58

1.84

6.94

2.98

8.03

.15

3.46

5.77

2.49

1.74

.28

.03

.01

0.00

0.00

44.95

ATOMS

NUMRERS (100.0)

17.76

.89

5.95

1.23

3.33

.06

3.29

3.33

2.51

1.03

.21

60.42

0

C'i

OR

An

AN

NE

LC

AC

NS

DI

WO

HY

OL

••T

H*'

IL

T!

RJ

*•• >

CC

MTiU/MOO-f 1-i.U

IH FtMlCS =

•.EIGHT riORM

(100.0)

0.00

0.00

12.P1

25.78

14.91

1.93

0.00

0.00

0.00

18.48

0.00

0.00

12.26

6.38

0.00

b.00

0.00

0.00

1.44

0.00

.64

MON-OXlDATION NOhM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

12.92

20.90

15.03

4.71

0.00

0.00

0.00

19.05

0.00

0.00

19.88

0.00

0.00

6.05

0.00

0.00

0.00

.48

NIGGL1

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

oz

111

18.

4 9.

20.

11.

5.

-33

3-COMPONFNT

WT.PERCENTS

F 56.59

M 22.23

A 21.IR

F 51.BH

C 28.70

A 19.47

N 24.83

K 15.52

C 59.6i

NO. 1168

MINERALOGY: Holocrystalline. Groundmass: An42,

titanaugite, fresh olivine, magnetite.

No. 1169

REMARKS: P2°5 trace-

 A Potassic rock.

MINERALOGY: Vetrose base. Phenocrysts: An60-65.

Groundmass: Plagioclase, iddingsitised olivine, rare

brown augite.

No. 1170

MINERALOGY: Flow-texture. Groundmass: Sanidine,

aegirine-augite, magnetite, calcite.

OTHER INFORMATION: Possibly a welded tuff.
1169

P0RPHYR1T1C TRACHYUA'ALT

09.01N 36.32E, SUVfMT OF TULU DA*

P. COMUCC1. 1948

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGU

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

SO3

TOTAL

OKlfclNAL

ANALYSIS

50.24

2.39

16.12

11.14

1.43

.06

.32

>.6O

.26

>.5O

).00

.99

.52

.00

.00

.00

.00

.00

.00

100.57

V.ATER-C02-FKEE

(100.0)

51.76

2.46

16.61

11.48

1.47

.06

2.39

5.77

2.33

5.67

0.00

SI

Tl

AL

Ft3

FE2

HN

MG

CA

NA

K

P

H«

HC

s

ATOMS

WEIGHT

23.47

1.43

8.53

7.79

1.11

.05

1.40

4.00

1.68

4.57

0.00

.02

.02

0.00

0.00

ATOMS

NUMBERS (100.0)

19.OR

.68

7.22

3.19

.45

.02

1.32

2.28

1.67

2.67

0.00

0

enOR

A3

AN

NE

LC

AC

NS

01

WO

HY

OL

MT

IL

TI

RU

AP

CC

MGO/MG0.FE0

IN FEMlCS =

fcElGHT NORM

(100.0)

3.29

0.00

33.56

19.74

18.07

0.00

0.00

0.00

0.00

6.23

0.00

3.08

0.00

0.00

11.50

3.25

1.28

0.00

0.00

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVEKTE D TO FEO)

0.00

0.00

34.31

19.62

18.47

.31

0.00

0.00

0.00

9.27

0.00

0.00

13.23

0.00

0.00

4.78

0.00

0.00

0.00

0.00

.33

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

27.7

38.1

17.5

16.6

.62

.26

5.2

0.00

.46

-20

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K.

C

55.50

10.24

34.26

48.48

21.60

29.93

16.9?

41.17

41.92

1170

TRACHYANOtSITE

09.30N 35.34E, MT. KATT A

P. C0MUCC1. 194B

SIU2

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

ORIGINAL

ANALYSIS

53.31

1.10

16.98

>.5O

i.ee

.27

.37

1.90

..91

1.21

.47

.40

.56

.11

).00

).00

).00

ftATER-C02-F«tE

(100.0)

55.59

1.15

17.71

5.74

4.05

.28

2.47

4,07

5,12

3.35

.49

SI

TI

AL

Ft3

FE2

MN

Mfci

CA

NA

K

P

ATOMS

wEI&HT

24.91

.66

8.98

3.85

3.02

.21

1.43

2.79

3.64

2.66

.21

ATOMS

NUMBERS (100.0

19.95

.31

7.49

1.55

1.22

.09

1.32

1.56

3.56

1.53

.15

0

OR

AR

AN

NE

LC

AC

NS

DI

wo

HY

OL

MT

IL

TI

RU

AP

CC

MGO/MGOVhCO

IN FEI-UCS =

WEIGHT NOWM

(100.0)

1.64

0.00

19.81

43.37

15.36

0.00

0.00

0.00

0.00

.98

o.oo 7.02

0.00

8.33

0.00

2.17

0.00

0.00

1.07

.8*

NON-OXIDATION NORM

(FE2O3 CONVEKTED T O FEO)

0.00

0.00

20.02

43.85

15.53

0.00

0.00

0.00

0.00

1.06

0.00

2.53

13.46

0.00

0.00

2.20

0.00

0.00

1.08

.26

.36

C/Frt

OZ

165

31

3-COhPONENT

WT.PERCENTS

F 47.21

M 11.93

A 40.87

F 43.83

C 1R.22

A 37.94

N 40,85

K 26.71

C 32.45
1171

TRACHYANDES1TE

09.3011 35.34E,

P. COMUCCI, 194

H T . KATTA JORGA , WOLLEGA

SIU2

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

54.22

.92

18.90

2.89

5.02

.22

1.80

4.80

4.11

4.17

.50

1.87

.42

.12

0.00

0.00

0.00

0.00

0.00

99.96

kATtR-C02-FREE

55.58

.94

19.37

2.96

5.15

.23

1.85

4.92

4.21

4.27

.51

(100.0)

SI

Tl

AL

Ft3

Ft2

MN

Mi

CA

NA

<

P

H*

HC

s

ATOMS

WEIGHT

25.33

.55

10.00

2.02

3.90

.17

1.09

3.43

3.05

3.46

.22

.02

.00

.03

0.00

ATOMS

NUMBERS (100.0)

19.94

.25

8.19

.80

1.55

.07

.99

1.69

2.93

1.96

.16

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HW

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

WEIGHT NORM

(100.0)

.20

.22

25.29

35.69

20.65

0.00

0.00

0.00

0.00

0.00

0.00

10.47

0.00

4.30

0.00

1.79

0.00

0.00

1.12

.28

.51

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

.22

25.44

35.89

20.76

0.00

0.00

0.00

0.00

0.00

0.00

5.50

8.99

0.00

0.00

1.80

0.00

0.00

1.13

.28

.32

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

168

34.6

28.H

16.0

20.7

.4

.2

2.1

.6

.5

-15

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

43.97

10.01

46.03

37.68

22.87

39.45

31.4?

31. 8H

36.70

No. 1171

MINERALOGY: Flow-texture. Groundmass: Sanidine

(An40?), aegirine-augite, large magnetite octahedra,

rare calcite.

OTHER INFORMATION: Possibly a welded tuff.

No. 1172

MINERALOGY: Groundmass: K-feldspar, nepheline,

aegirine, rare magnetite.

No. 1173

MINERALOGY: Vetrose base. Phenocrysts: Sanidine.

Groundmass: Glass with some feldspar, aegirine,

magnetite.
1172

BOSTONITE DYKE

08.46N 35.52E,

P. COMUCCI, 1948

BASE OF SUMMIT PYRAMID. TULU JEHGO, WOULEGA

5102

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K2U

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

59.70

.20

17.14

5.87

1.29

.17

.09

1.00

7.36

5.B2

.09

1.12

.42

0.00

0.00

0.00

0.00

0.00

0.00

100.27

WATER-C02-FKEE

(100.0)

60

17

5

1

1

7

5

47

20

36

95

31

17

09

01

45

89

09

SI

TI

AL

F£3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

27.89

.12

9.07

4.11

1.00

.13

.05

.71

5.46

4.83

.04

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0

21.40

7

1

5

2

05

24

59

39

05

05

38

12

66

03

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H*l

IL

TI

R'J

AP

CC

MGO/MGO+FEO

IN FLMICb =

WEIGHT MORM

(100.0)

0.00

0.00

34.92

45.03

0.00

6.17

0.00

6.00

0.00

.49

1.62

0.00

0.00

4.20

.99

.38

0.00

0.00

.20

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

35.32

44.13

0.00

7.00

0.00

0.00

1.60

4.05

0.00

0.00

7.30

0.00

0.00

.39

0.00

0.00

.20

0.00

.03

SI

AL

FM

C

ALK

214

36.3

20. H

3.9

39.1

3-COMPONENT

WT.PERCEMS

F 35.05

51.90

41.04

7.05

1173

ALKALINE TRACHYTf.

08.51N 35.50E. BUBE.

P. COMUCCI, 1948

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAU

NA20

K20

P205

H2G +

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

59.96

.50

16.55

3.43

2.55

.20

.55

1.60

6.19

6. 69

.11

1.34

.74

0.00

0.00

0.00

o.oo

o.oo

0.00

100.41

wATER-C02-FfiEE

(100.0)

60.98

.51

16.63

3.49

2.59

.20

.56

1.63

6.30

6.80

.11

51

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

Ht

HC

S

ATOMS

WEIGHT

28.01

.30

8.76

2.40

1.98

.15

.33

1.14

4.59

5.55

.05

.02

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

21.62

7

4

3

14

03

93

77

06

30

62

33

08

03

0

CR

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

"IL

TI

RU

AP

CC

MfiO/MGOtFEO

IN FEHICS =

KL-IGHT NORM

(100.0)

0.00

0.00

40.31

39.42

0.00

4.98

0.00

4.?0

0.00

6.28

0.00

0.00

.63

2.96

0.00

.97

0.00

0.00

.24

0.00

.41

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

40.58

39.84

0.00

4.93

0.00

0.00

1.12

6.54

0.00

0.00

5.78

0.00

0.00

.97

0.00

o.oo

.25

0.00

.16

SI

AL

FM

C

ALK

218

35

20

6

37

3-COMPONENT

WT.PERCENTS

F 30.81

29.23

7.8?

A?.95

42.75

46.20

11.05
1174

POSTONITE DYKE

08.45n 35.51E, SUMMIT OF TULU JERoO, WOLLEGA

P. COMUCC U 1948

SIU2

T1O2

AL2O3

FE2O3

FEU

MNO

MGO

CAO

N42O

K2u

P2U5

H2O*

H2OCO2

SO3

TnTAL

ORIGINAL

ANALYSIS.

60.CR

.10

16.47

5.05

1.22

.16

.16

1.45

S.90

6.96

.07

1.P9

1.00

o.co

0.00

0.00

0.00

0.00

0.00

100.53

WATER-CO2-FHEE

(100.0)

61.53

.10 1

16.87 /

>I

nVL

5.17 FE3

1.25 Ft2

.16 MU

.IS Mi

1.49 CA

6.04 NA

7.13 *

.07 f

1+

3

ATOMS

HEIGHT

28.07

.06

8.71

3.53

.95

.12

.11

1.04

4.38

5.78

.03

.02

.01

0.00

0.00

47.72

ATOMS

NUMBERS (100.0)

21.82

.03

7.05

1.38

.37

.05

.10

.56

4.16

3.23

.02

61.24

WtlGHT '<OKM

(100.0)

0.00

0.00

42.23

42.83

0.00

2.26

0.00

3.74

0.00

.Q9

2.37

0.00

0.00

4.26

.94

0.00

0.00

.16

0.00

IN Flli'Itb = 1.00

NON-OXIDATION NORM

(FE203 CONVEKTE O TO FEO)

0.00

0.00

42.65

40.03

0.00

4.03

0.00

0.00

1.00

6.23

0.00

0.00

5.71

0.00

0.00

.20

0.00

0,00

.16

0.00

C/FM

02

3-COMPONENT

WT.PERCENTS

F 32.47

M .91

A 66.60

f 30.47

C 7.OS

A 62.49

N 41.23

K 48.64

C 10.13

No. 1174

MINERALOGY: Holocrystalline, flow-textured.

Groundmass: Very dominant K-feldspar; nepheline,

aegirine, magnetite, chlorite.

No. 1175

REMARKS: F2C>5 trace.

MINERALOGY: Phenocrysts: Sanidine. Groundmass:

Dominant alkali feldspar; some sodic plagioclase,

arfvedsonite; rare quartz, muscovite, epidote,

barkevikite(?).

OTHER INFORMATION: Imprecise locality.

No. 1176

REMARKS: Published summation is 100.41.

MINERALOGY: Abundant glass shows in H-O content.

Phenocrysts: Sanidine. Groundmass: Sanidine, sodic

plagioclase, green pyroxene, magnetite, all set in glass;

no quartz; spherulites bear calcite.

OTHER INFORMATION: Locality not identified.
1175

C0ME«4L)ITE

P. COMUCCI, 1946

1K> N. OF GORUCwiA, LEFT BANK BARG RIVERt ILUdAUOR

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

SO3

TOTAL

GRICINAi

AMALYSI:

63.50

.57

14.51

3.87

2.50

.12

.14

• 4H

b.36

5.41

0.00

.82

1.81

0.00

0.00

0.00

0.00

o.oo

0.00

100.09

hATER-C02-FKtE

(100.0)

5.55

0.00

SI

T l

AL

FE3

Ft2

ATOMS

WEIGHT

29.67

ATOMS

NUMBERS (1G0.0)

0

CT

OR

AT

AN

NE

LC

AC

NS

Dt

wo

HY

OL

MT

HM

IL

TI

RU

AP

CC

KEIGH T IMC'I

(100.0)

5.60

0.00

32.89

45.f>2

0.00

0.00

0.00

8.57

0.00

2.15

0.00

2.3B

0.00

1.4B

0.00

1.11

0.00

0.00

0.00

0.00

NON-OXIDATION NORM

(FE203 CONVF.KTED TO FEO)

6.11

0.00

33.14

45.97

0.00

0.00

0.00

0.00

2.28

2.19

0.00

9.18

0.00

0.00

0.00

1.12

0.00

0.00

0.00

0.00

MGO/MGO+FLO

IN FEMCb =

SI

AL

FM

TI

P

C/FM

QZ

l.b

0.00

.10

17

3-COMPONENT

WT.PERCENTS

F 34.B5

51.92

44.16

1176

TRACHYRHYOLITt

P. COnUCCIi 194 8

i'O<A AND GAMALIt. cJARO VALLEY

SI02

TI02

AL2O3

FE203

FFO

MNO

MGO

CAO

NA2O

K2O

P2J5

H20*

H2OCO2

SOJ

THTAL

ANALYSI

64.48

.86

10. 2H

3.15

3.F8

.16

.78

2.16

3.13

5.24

.16

4.86

1.06

.11

0.00

0.00

0.00

0.00

0.00

100.31

*ATEK-CO;z-FKE.E

(100.0)

68.39

.91

10.90

3.34

4.12

.17

.83

2.29

3.32

5.56

• 17

SI

TI

AL

Ft3

FE2

MN

MG

CA

NA

K

P

ATOMS

WEIGHT

30.13

.52

5.44

2.20

3.02

.12

.47

1.54

2.32

4.35

• 07

ATOMS

NUCIBERS (100.0)

24.32

4

1

2

2

24

57

90

23

05

44

B7

29

52

05

0

enOR

AH

AN

NF.

LC

AC

NS

DI

wn

HY

OL

MT

HI

IL

TI

AP

CC

IN FEhJCS =

WEIGHT NOkM

(100.0)

23.00

0.00

32.P9

25.05

U.CO

0.00

0.00

2.71

0.00

ti.18

0.00

2.30

0.00

3.49

a.oo

1.73

0.00

0.00

.37

.27

.3"

NON-OX I DAT I ON NORM

(FE2O3 CONVERTED TO FEO)

21.02

0.00

33.11

25.21

0.00

0.00

0.00

0.00

.72

8.45

0.00

9.11

0.00

0.00

0.00

1.74

0.00

0.00

.37

.27

.19

FM

C

ALK

K

MG

TI

P

C/FM

QZ

31.9

10.7

29.5

.52

.17

3.0

.31

.33

84

3-COMPONENT

WT.PERCENTS

F 43.45

M 4.82

A 51.73

F 40.03

C 12.30

A 47.67

N 29.72

K 49.76

C 20.51
1177

GLASSY BASAL1

P. COMUCC] , 1950

SI02

TI02

AL2O3

FE203

FEO

MNU

MGO

CAU

NA20

KZU

P205

H20+

H20-

C02

S03

TOTAL

OHItlMAL

ANALYSIS

4

1

1

2.32

2.53

b.13

,.13

.21

• 17

b.99

3.98

L.40

L.25

3.00

1.88

'.52

).00

0.00

0.00

0.00

0.00

0.00

100.51

kATER-C02-FKEE

(100.0)

44.97

2.69

17.14

15.01

.22

.18

7.43

9.54

1.49

1.33

0.00

SI

Tl

AL

FE3

FE2

MU

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

HEIGHT

19.77

1.52

8.53

9.88

.16

.13

4.22

6.42

1.04

1.04

0.00

.05

.03

0.00

0.00

47.72

ATOMS

NUMBERS (100.0)

16.65

.75

7.48

4.19

.07

.06

4.11

3.79

1.07

.63

0.00

61.22

0

CB

OR

A?

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/hGO+FEO

IiM FtMC S =

Wtl&HT MOl'M

(100.0)

3.68

0.00

7.87

12.61

36.14

0.00

0.00

0.00

0.00

2.74

0.00

17.26

0.00

0.00

15.04

.86

3.80

0.00

0.00

0.00

1.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

8.10

12.98

37.20

0.00

0.00

0.00

0.00

9.63

0.00

8.10

18.74

0.00

0.00

5.25

0.00

0.00

0.00

0.00

.57

NIGGLI

SI

AL

FM

C

ALK

<

MG

TI

P

C/FM

OZ

99

2 2.

50.

22.

5.

4.

0.

-21

3-COMPONENT

WT.PERCENTS

59.80

29.15

11.05

55.22

3 4. 5R

10.20

12.04

10.75

77.21

NO. 1177

MINERALOGY: Groundmass: Dark brown glass, possible

fertile microlites, bands of fine vesicles.

OTHER INFORMATION: Locality not identified.

No. 1178

MINERALOGY: Highly scoriaceous rock. Groundmass:

Dark-brown glass, corroded Mg-rich olivine and augite

(augite crystallised after olivine), feldspar microlites.

OTHER INFORMATION: Young lava of Aden Series.

No. 1179

MINERALOGY: Phenocrysts: Olivine, rare brown

augite. Groundmass: Basic plagioclase, abundant

femics (olivine and augite(?), magnetite.
1178

GLASSY BASALT

11.55N 37.19E,

P. COMUCCI, 1950

OAGA ISLAND. LAKE TANA

SI02

TI02

AL2O3

FE2O3

FEU

MNO

MGO

CAO

NA20

K2J

P2O5

H20+

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

43.42

2.11

13.01

10.74

3.49

.13

9.81

10.21

4.31

1.29

.50

.59

.62

0.00

0.00

0.00

0.00

0.00

0.00

100.43

V.ATER-C02-FREE

43.85

2.13

13.14

10.85

3.52

.13

9.91

10.31

4.35

1.30

.50

(100.0)

SI

Tl

AL

FE3

FE2

MN

Mb

CA

NA

K

P

H +

HC

s

ATOMS

WEIGHT

20.29

1.26

6.88

7.51

2.71

.10

5.92

7.30

3.20

1.07

.22

.01

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

16.23

.59

5.73

3.03

1.09

.04

5.48

4.09

3.13

.62

.16

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HI

IL

TI

R'J

AP

CC

M60/MG0+FE0

IN FEMICS =

WEIGHT NORM

(100.0)

0.00

0.00

7.71

13.00

12.41

12.94

0.00

0.00

0.00

27.92

0.00

0.00

8.25

5.64

6.98

4.04

0.00

0.00

1.10

0.00

1.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

7.88

3.44

12.67

18.54

0.00

0.00

0.00

30.06

0.00

0.00

22.15

0.00

0.00

4.13

0.00

0.00

1.13

0.00

.63

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

48.01

33.10

18.89

47.37

33.99

18.64

27.2h

B.16

64. 5R

1179

OLlVlNE BASALT

12.32N 37.11E,

P. COMUCCI, 1950

CjOANG VALLEY, BE&HEMDE H

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

SOi

TOTAL

ORIGINAL

ANALYSIS

43.66

2.57

14.30

4.46

7.41

.14

8.69

9.80

3.02

3.07

.40

2.03

.59

0.00

0.00

0.00

0.00

0.00

0.00

100.34

MATER-C02-FHEE

(100.0)

44.68

2.63

14.63

4.56

7.58

.14

9.10

10.03

3.09

3.14

.41

SI

TI

AL

FE3

FE2

MN

MC

CA

NA

K

P

ATOMS

WEIGHT

20.40

1

7

3

5

5

7

2

2

54

57

12

76

11

36

00

24

55

17

ATOMS

NUMBERS (100.0)

16.57

6

1

2

5

3

2

1

73

40

28

36

05

04

99

22

49

13

WEIGHT NORM

(100.0)

0.00

0.00

Id.60

2.63

16.72

12.77

0.00

U.OO

0.00

24.50

0.00

0.00

12.26

6.63

0.00

4.99

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

13.14

0.00

16.87

14.32

4.41

0.00

0.00

25.38

0.00

0.00

19.94

0.00

0.00

5.03

0.00

0.00

AL

FM

C

ALK

K

MG

18.0

49.1

22.5

10.5

.40

.58

3-COMPONENT

WT.PERCENTS

F 44.21

M 33.11

A 22.68

F 42.76

C 35.30

A P1.94

N 19.01

K 19.32

C 61.67

CC

MGO/MGG+FEO

IN FEKICS =
1180

PORPHYRITIC DOLE^ITIC BASALT

, GONDAR-DEtjAREK ROA0,

P. COMUCCI, 1950

SIU2

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NAiO

K2U

P2O5

H2O*

H2OSO3

ORlGI'iAL

ANALYSIS

44.43

1.16

14.27

8.28

3.49

WATER-CO2-FREE

(1OO.O)

48.29

1.26

15.51

9.00

3.79

.16

9.58

10.43

1.64

SI

TI

AL

FE3

FE2

MN

Mb

CA

NA

ATOMS

WEIGHT

20.76

.70

7.55

5.79

2.71

.12

5.31

6.86

1.12

ATOMS

NUMBERS (100.0)

17.65

.35

6.68

2.48

1.16

.05

5.23

4.09

1.16

.16

0.00

0.00

0.00

TOTAL

Q

CB

OR

Aft

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H'X

IL

TI

R'J

AP

CC

IN Ftr-iICS =

100.07

WEIGHT hOHM

(100.0)

4.54

0.00

2.00

13.91

33.93

0.00

0.00

0.00

0.00

13.96

0.00

17.42

0.00

9.13

2.72

2.39

0.00

0.00

0.00

0.00

1.00

NON-OX I DAT I ON NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

2.03

14.16

34.53

0.00

0.00

0.00

0.00

14.98

0.00

20.92

10.96

0.00

0.00

2.43

0.00

0.00

0.00

0.00

.63

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

UZ

104

19. 6

52.4

24.1

3.9

.12

.59

2.0

0.00

.46

-12

3-COMPONENT

MT,

F

M

A

F

C

A

N

K

C

O.I.

.PERCENTS

52.54

39.33

8.13

50.75

41. 40

7.85

13.22

2.71

84.Oh

57.19

No. 1180

REMARKS: Very high water content.

MINERALOGY: Phenocrysts: Large An70, rare augite.

Groundmass: Medium grained, rare large vesicles;

An70(?), abundant augite; serpentinised olivine, glass;

magnetite.

No. 1181

REMARKS: Titaniferous, sub-aluminous.

MINERALOGY: Phenocrysts: Olivine showing resorbtion,

rare titanaugite. Groundmass: Feldspar, augite,

magnetite.

OTHER INFORMATION: Locality not identifiable.

No. 1182

MINERALOGY: Phenocrysts: Abundant fresh Mg-rich

olivine. Groundmass: Olivine, titanaugite, subordinate

plagioclase An55, glass, magnetite.

OTHER INFORMATION: Recent lava; locality not

identifiable. Analysis of scolecite from north of Danqual

hot springs (locality not identifiable): SiO? 45.40%,

A12O3 26.26%, total iron as Fe2O- 0.16%,

MgO 13.76%, Na2O 0.72%,

13.75%, summation 100. 23.

0.18%, total
1181

OLIVINE LASALT

11.2ON 37.34E,

P. COMUCCI. 1950

ARAGHlr LlnO nr,OJJA«»

5102

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

OR It, IN A,

ANALYSIS

45.00

3.70

8.80

5.87

10.11

.16

10. R9

12.05

1.87

.73

0.00

.53

.<*8

0.00

0.00

0.00

0.00

0.00

0.00

100.19

»,ATER-cO2-FrtEE

(100.0)

45.37

3.73

8.87

5.92

10.19

.16

10.98

12.15

1.89

SI

TI

AL

Ft3

Ft2

MN

Mt,

CA

NA

ATOMS

WEIGHT

21

2

4

4

7

6

8

1

02

22

66

11

86

12

57

61

.39

ATOMS

NUKBERS (100.0

17.12

1.06

3.95

1.68

3.22

.05

6.18

4.91

1.38

0

ce

OR

A

1)

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FLO

Ii4 FEMICS =

WEIGHT NORM

(100.0)

0.00

0.00

4.36

15.98

13.55

0.00

0.00

0.00

0.00

37.43

0.00

1.59

11.42

B.60

0.00

7.08

0.00

0.00

0.00

0.00

.82

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

4.41

10.26

13.70

3.20

0.00

0.00

0.00

38.90

0.00

0.00

22.37

0.00

0.00

7.16

0.00

0.00

0.00

0.00

.62

MG

TI

P

C/Fil

UZ

.56

5.6

0.00

.44

-28

3-COMPONENT

WT.PLRCENTS

F 54.22

52.17

39.34

8.49

12.76

4.9M

82.25

1182

SCORIACEObS PUKPHYRITIC > ASALT

, TULU 2UHA, (M.

P. C0.1UCC1 , 1950

OF DANGHILA) GOJJAM

SI02

TI02

AL2O3

FE203

FEU

MNU

MGU

CAO

NA20

K20

P205

H20*

H20-

COZ

S03

TOTAL

OKI&INA L

ANALYSIS

45.17

1.05

14.86

3.27

6.82

.12

12.53

11.06

2.38

2.05

.32

.42

.75

0.00

0.00

0.00

0.00

0.00

0.00

100.eo

WATER-C02-FHEE

(100.0)

45.34

1.05

14.92

3.28

6.85

.12

12.58

11.10

2.39

2.06

.32

SI

TI

AL

FL3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

AT0M5

WEIGHT

21.10

7

2

5

7

7

1

1

63

86

29

30

09

56

90

77

70

14

00

01

0.00

0.00

ATOMS

NUMBERS (100.0)

16.57

.29

6.43

.90

2.10

.04

6.86

4.35

1.69

.96

.10

0

cs

OR

AB

AN

NE

LC

AC

NS

DI

wo

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGOtFEO

I iM FEhlCS =

WEIGHT NORM

(100.0)

0.00

0.00

12.18

3.50

23.86

9.07

0.00

0.00

0.00

23.40

0.00

0.00

20.44

4.77

0.00

2.00

0.00

0.00

.70

0.00

.83

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

11.67

0.00

24.01

11.04

.46

0.00

0.00

24.00

0.00

0.00

26.11

0.00

0.00

2.01

0.00

0.00

.71

0.00

.72

C/FM

QZ

52.7

23.2

7.1

3-COMPONENT

WT.PERCENTS

F 37.30

M 46.37

A 16.38

F 39.44

C 43.24

A 17.3?

N 15.36

K 13.23

C 71.40
1183

DOLFRITIC BASALT

11.25N 36.58E,

P. COMUCCIi 19bO

SIO2

TIO2

AL2O3

FE2O3

FEO

MNU

CAO

NA2O

K2U

P2O5

H2O*

H2OCO2

S03

TOTAL

ORIGINAL

ANALYSIS

45.41

1.41

13.98

5.36

6.62

.14

8.93

9.38

1.29

.96

• 20

3.90

2.30

0.00

0.00

0.00

0.00

0.00

0.00

99.88

WATER-C02-FREE

(100.0)

48.47

1

14

5

7

9

10

1

1

51

92

72

07

15

53

01

38

02

21

SI

TI

AL

FE3

FE2

MN

M(j

CA

NA

K

P

hU

HC

s

0

ATOMS

WEIGHT

21.22

.85

7.40

3.75

5.15

.11

5.39

6.70

.96

.80

.09

.05

.03

0.00

0.00

47.41

ATOMS

NUMBERS (100.0

17.80

6

1

2

5

3

42

46

58

17

05

?3

94

98

4B

07

60.83

0

C3

OR

AR

AM

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

ltt FEMICS =

wtlGHT NORM

(1OO.0)

2.18

0.00

6.07

11.67

31.49

0.00

0.00

0.00

0.00

13.57

0.00

23.3R

0.00

b.31

0.00

2.R6

0.00

0.00

.47

0.00

.84

NON-OXIDATION NORM NIGGLI

(FE2O3 CONVERTED TO FEO)

0.00 3I

0.00 AL

6.14

11.80

31.84

0.00 I

0.00 »

"M

^LK

IS

0.00 TI

0.00 P

14.15 C/FM

0.00 QZ

22.00

10.71

0.00

0.00

2.89

0.00

0.00

.47

0.00

.62

105

19.1

53.3

23.3

4.3

.33

.58

2.5

.20

.44

-12

3-COMPONENT

wT.PERCtNTS

F

M

A

F

C

A

N

K

C

D.I.

51.73

38.56

9.72

50.74

39.73

9.53

11.09

8.25

80.65

57.29

NO. 1183

REMARKS: High water content.

MINERALOGY: Groundmass: Yellow-brown glass with

rare magnetite and rare vesicles, serpentinised olivine,.

augite, An70.

OTHER INFORMATION: Locality not identified.

No. 1184

MINERALOGY: Phenocrysts: Somewhat altered olivine.

Groundmass: Plagioclase, augite, olivine, magnetite.

OTHER INFORMATION: Locality not identified.

No. 1185

REMARKS: Sub-calcic-magnesic.

MINERALOGY: Extemely fine-grained rock. Groundmass: Abundant plagioclase, glass, augite, iddingsitised olivine (occasional phenocrysts), magnetite.
11 84

OLIVINE BASALT

P. COMUCCI. 1950

SI 02

TI02

AL2O3

FE203

FEO

MNO

MGO

CAD

NA2Q

K20

P2O5

H2G+

H20-

C02

S03

TOTAL

ORI&INAl

ANALYSIS

45.57

1.64

16.25

3.21

6.91

.16

9.19

10.76

2.24

1.17

.12

1.69

1.00

0.00

0.00

0.00

0.00

0.00

o.no

99.91

WATER-C02-FREE

(100.0)

46.87

1.69

16.71

3.30

11.07

2.30

1.20

SI

TI

AL

Ft3

F£2

MM

MG

CA

NA

K

P

H +

HC

s

ATOMS

WEIGHT

21.29

.98

8.60

2.25

5.37

.12

5.54

7.69

1.66

.97

.05

.02

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

17.13

.46

7.20

.91

2.1R

.05

5.16

4.34

1.63

.56

.04

IN FEMICS -

WEIGHT NOPM

(1OO.O)

0.00

0.00

7.13

17.15

31.68

1.29

0.00

0.00

0.00

IB.13

0.00

O.PO

16.36

4.R0

0.00

3.20

0.00

0.00

.27

0.00

NON-OXIDATION NORM

(FE203 CONVEKTED TO FEO)

0.00

0.00

7.17

13.43

31.88

3.37

0.00

0.00

0.00

18.58

0.00

0.00

22.08

0.00

0.00

3.22

0.00

0.00

.27

0.00

.67

SI

AL

FM

C

99

20.«

47.9

25.0

3-COhPONENT

WT.PtRCENTS

F 44.54

M 40.45

A 15.01

F 41.66

C 44.30

A 14.04

N 15.81

K 8.26

C 75.94

1185

APHYRIC BASALT

12.37IM 37.27E,

P. COMUCCI, 1950

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAU

NA20

K20

P205

H20 +

H20-

C02

S03

TOTAL

OftK-INAL

ANALYSIS

45.64

3.07

16.02

6.65

7.54

.18

4.76

7.39

4.24

2.38

.04

1.29

1.07

U.OO

0.00

0.00

0.00

0.00

0.00

100.27

kATER-C02-FKEE

(100.0)

7.70

.18

4.86

SI

TI

AL

Ft3

FE.2

MN

Mlj

CA

NA

K

P

H +

HC

s

ATOMS

WEIGHT

21.32

1.84

8.48

4.65

5.86

.14

2.87

5.28

3.15

1.98

.02

.02

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

17.30

.88

7.16

1.90

2.40

.06

2.69

3.00

3.12

1.15

.01

0

CR

OR

AB

AN

NE

LC

AC

N5

DI

WO

HY

OL

MT

H!A

IL

TI

RU

AP

CC

MGO/MG0*FEO

IN FEMICS -

WEIGHT NORM

(100.0)

0.00

0.00

14.39

22.52

17.97

7.69

0.00

o.oo

o.oo

15.45

U.OO

0.00

6.07

9.87

0.00

5.95

0.00

o.oo

.09

0.00

.81

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

14.58

14.89

18.21

12.08

0.00

0.00

0.00

16.45

0.00

0.00

17.67

0.00

0.00

6.03

0.00

o.oo

.09

0.00

.45

C/FM

QZ

19. 1

13.6

3-COMPONENT

«IT.PERCENTS

F 55.49

M 18.62

A 25.«9

F 50.32

C 26.21

A 23.48

N 30.26

K 16.99

C 52.75
1186

GLASSY BASALT

U.OOiM 36.5SE.

P. COfiUCCl* 1950

SIU2

TI02

AL2O3

FE2O3

FEO

MNO

M60

CAO

NA20

K 2 0

P205

H20 +

H20-

C 0 2

S 0 3

TOTAL

ORIGINAL

ANALYSIS

45.77

1.58

16.05

3.63

7.12

. 1 9

ti.34

10.29

3.65

2.21

• 39

. 6 4

. 4 8

0.00

0.00

0.00

0.00

0.00

0.00

100.34

WATER-C02-FREE

(100.0)

46.13

1.59

16.18

3.66

7.18

. 1 9

8.41

10.37

3.66

2.23

. 3 9

SI

TI

AL

F£3

FtZ

MN

Mi,

CA

NA

K

P

H*

H -

C

S

0

ATOMS

WEIGHT

21.38

. 9 5

8.49

2.54

5.53

.15

5.03

7.35

2.71

1.83

. 1 7

. 0 1

. 0 1

0.00

0.00

44.19

ATOMS

NUMBERS (100.0 )

16.43

. 4 4

7.00

1.01

2.21

. 0 6

4.60

4.08

2.62

1.04

. 1 2

59.89

0

CB

OR

AP

AN

NE

LC

AC

NS

D I

WO

HY

OL

MT

H"ri

IL

TI

RJ

AD

CC

MGG/MGO+HFG

I,i FLMCS =

WEIGHT riCiRK*

(100.0 )

0.00

0.00

13.19

B.91

20.99

12.07

0.00

0.00

0.00

22.70

0.00

0.00

12.04

S.32

0.00

3.02

0.00

0.00

. 0 6

0.00

. 7 P

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

13.28

4.73

21.14

14.45

0.00

0.00

0.00

23.35

0.00

0.00

19.14

0.00

0.00

3.04

0.00

0.00

. 8 7

0.00

. 6 3

N1GG

SI

AL

FM

C

ALK

K

M3

TI

P

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 43.09

M 33.43

A 23.49

F 39.96

C 38.25

A J1.7H

N 22.60

K 13.68

C 63.72

No. 1186

MINERALOGY: Groundmass: Preponderant brown glass,

augite, corroded olivine, magnetite, rare plagioclase.

OTHER INFORMATION: Finely scoriaceous, young lava

of Aden Series.

No. 1187

MINERALOGY: Groundmass: Fine-grained actinolite

and altered plagioclase, nodules of serpentinite(?) and

magnetite.

OTHER INFORMATION: Precise nature of this rock is

uncertain. From 100 m below the summit of Selki:

altered quartz-gabbro, composed of abundant zoned

An67, actinolite, epidote, chlorite, common magnetite,

brown titanite, rare quartz.

No. 1188

MINERALOGY: Coarsely scoriaceous rock. Phenocrysts:

An70-75, olivine, augite. Groundmass: Plagioclase,

magnetite, glass, femics(?), no zeolites.

OTHER INFORMATION: Locality not identified.
1187

ALTERED HcRUBLENDITE

13.17N 38.17E, MT.

P. COMUCCI. 19S0

5AMPHIBOLITISLD BASALT"

SELKl, blMIEN

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H20-

CO2

SO3

TOTAL

ORIGINAL

ANALYSIS

45.78

1.13

11.16

4.95

7.47

.08

16.24

H.43

1.01

1.23

• 16

1.91

1.12

0.00

0.00

o.oo 0.00

0.00

0.00

100.67

wATER-C02-FREE

46.89

1.16

11.43

5.07

7.65

.08

16.63

8.63

1.03

1.26

.16

(100.0)

SI

TI

AL

FE3

FE2

MN

M6

CA

NA

K

P

H +

HC

S

ATOMS

WEIGHT

21.39

.68

5.90

3.46

5.81

.06

9.80

6.02

.75

1.02

.07

.02

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

17.13

.32

4.92

1.40

2.34

.03

9.07

3.38

.73

.59

.05

0

CP

OR

A8

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO*FEO

IN FEMC S =

WtlGHT NORM

(100.0)

0.00

0.00

7.46

8.77

22.80

0.00

O.OO

0.00

0.00

15.19

0.00

19.60

16.26

7.37

0.00

2.20

0.00

0.00

.36

0.00

.87

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

7.53

8.85

23.02

0.00

0.00

0.00

0.00

15.64

0.00

10.83

31.54

0.00

0.00

2.22

0.00

0.00

.36

0.00

.73

SI

AL

FM

C

ALK

88

12.7

66.4

17.5

3.4

3-COMPONENT

WT.PERCENTS

F 40.19

H 52.56

A 7.25

F 53.79

C 36.51

A 9.70

11.53

79.01

1188

P0RPHYR1TIC GLASSY OLlVlliE RASALT

11.47N 37.10E. MOSHA riGOjJAM"

P. COMUCCI, 1950

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA£O

K20

P205

H20*

H20-

C02

S03

TOTAL

ORI&INA L

ANALYSIS

46.23

1.63

14.34

4.95

8.47

.18

9.20

9.76

2.33

.73

.28

1.33

.88

0.00

0.00

0.00

0.00

0.00

0.00

100.31

WATER-C02-FREE

(100.0)

47.13

1.66

14.62

5.05

8.63

.18

9.38

9.95

2.38

.74

.29

SI

TI

AL

Ft3

Ft2

MM

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

21.60

.98

7.59

3.46

6.58

.14

5.55

6.98

1.73

.61

.12

.02

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

17.38

6

1

2

5

3

1

46

35

40

67

06

16

93

70

35

09

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

wo

HY

OL

MT

HM

IL

TI

RU

AP

CC

MG0/M60*Ft0

IN FtMK S =

WEIGHT NORM

(100.0)

0.00

0.00

4.41

20.13

27.00

0.00

0.00

0.00

0.00

16.73

0.00

10.21

10.42

7.33

0.00

3.15

0.00

0.00

.62

0.00

-.77

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

4.45

20.33

27.26

0.00

0.00

0.00

0.00

17.30

0.00

.71

26.14

0.00

0.00

3.18

0.00

0.00

.63

0.00

.59

SI

AL

FM

C

100

18.2

53.3

22.6

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F 52.26

M 35.83

A 11.92

F 51.14

C 37.20

A 11.66

N 18.17

K 5.69

C 76.13
1189

PORPHYRITlC r.ASALT

12.07H 37.55E, L

P. COMLICC1. 1950

E. OF ADDIS ZEMEN, BEGHEMDEk

SI 02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20 +

H20-

C02

S03

ORIGINAL

ANALYSIS

46.29

1.61

13.93

6.87

6.20

.18

6.19

9.72

2.97

2.60

.42

2.58

0.00

0.00

0.00

100.16

wATER-C02-FKEE

UOO.O)

14.36

7.08

10.02

3.06

2.68

SI

TI

AL

FE3

FE.2

MN

MG

CA

NA

•it

•IATOMS

WEIGHT

21.63

.97

7.37

4.80

4.82

.14

3.73

6.95

2.20

2.16

.18

.03

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

17.

0

OR

AR

AN

NE

LC

AC

NS

Dl

WO

HY

OL

MT

HH

IL

TI

RU

AP

ccMGO/MGG*FEO

IN FEMC 5 r

fcElCiHT NOCM

(100.0)

0.00

0.00

15.88

18.91

17.46

3.82

0.00

0.00

0.00

23.68

0.00

0.00

5.85

10. ?q

0.00

3.15

0.00

0.00

.95

0.00

.86

NON-OX I DAT I ON NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

16.09

10.90

17.72

8.35

0.00

0.00

0.00

25.18

0.00

0.00

17.60

0.00

0.00

3.19

0.00

0.00

.96

0.00

.51

NIG6LI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

108

19.

46.

24.

10.

2.

-35*

3-COMPONENT

WT.PERCENTS

F 52.64

M ?4.93

A 22.43

F 46.09

C 34.27

A 19.64

N 19.42

K 17.00

C 63.57

No. 1189

MINERALOGY: Phenocrysts: Small plagioclase, titanaugite, olivine, Groundmass: Plagioclase, magnetite,

augite.

No. 1190

MINERALOGY: Abundant An65, augite, iddingsitised

olivine. Groundmass: Plagioclase, abundant magnetite,

altered olivine.

No. 1191

MINERALOGY: Very fine-grained, minutely vesicular

rock. Phenocrysts: Zoned An70 (center) to An73 (rim),

small serpentinised olivines. Groundmass: Plagioclase,

abundant magnetite, augite.

OTHER INFORMATION: Locality not identified.
1190

PORPHYFUTIC BASALT

11.36N 36.52E. 1S«ALA GHEORGHIS.

P. COMUCCI , 1950

SIO2

TIO2

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K2O

P2O5

H2O*

H2OCD2

S03

TOTAL

ORIGINAL

ANALYSIS

46.40

2.06

16.49

6.00

5.48

.14

5.76

9.48

4.12

1.54

.45

1.33

.77

0.00

0.00

0.00

0.00

0.00

0.00

100.02

WATER-C02-FREE

(100.0)

47.39

2.10

1 .84

>.13

).6O

.14

>.88

J.68

• .21

1.57

.46

SI

TI

AL

FE3

FL2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

21.68

1.23

8.72

4.20

4.26

.11

3.47

6.78

3.06

1.28

.20

.02

.01

0.00

0.00

ATOMS

NUMBERS (100.0

17.37

.58

7.28

1.69

1.72

.04

3.22

3.80

2.99

.74

• 14

0

a

OR

A8

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

PiJ

AP

CC

MGO/MGOthtiU

IN FbMICS =

WEIGHT NORM

(100.0)

0.00

0.00

9.31

24.29

22.37

6.16

0.00

0.00

0.00

IS.20

0.00

0.00

5.77

8.90

0.00

3.99

0.00

0.00

1.00

0.00

.91

NON-OX I DAT I ON NORM

(FE2O3 CONVEKTED TO FEO)

0.00

0.00

9.42

17.44

22.63

10.10

0.00

0.00

0.00

19.37

0.00

0.00

15.98

0.00

0.00

4.04

0.00

0.00

1.02

0.00

.54

FM

C

ALK

41. a

23.8

11.7

3-COMPONENT

WT.PERCENTS

F 50.11

M 25.15

A 24.72

F 43.13

C 35.61

A 21.2h

N 27.21

K 10.17

C 62.62

1191

PORPHYRITIC

P. COMUCCI, IS>5O

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MtjO

CAO

NA20

K2U

P205

H20*

H2UC02

S03

TOTAL

ORIGINAL

ANALYSIS

46.47

1.87

15.17

4.67

8.40

.16

7.50

9.45

3.46

1.15

.23

1.08

• 43

0.00

0.00

0.00

o.co

0.00

0.00

100.04

WATER-C02-FKEE

47.16

1.90

15.40

4.74

8.53

.16

7.61

9.59

3.51

1.17

.23

(100.0)

SI

TI

AL

FE3

FE2

MN

Mo

CA

NA

K

P

H*

HC

5

ATOMS

WEIGHT

21.71

1.12

8.03

3.27

6.53

.12

4.52

6.75

2.57

.95

.10

.01

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

17.39

.53

6.69

1.32

2.63

.05

4.19

3.79

2.51

.55

.07

0

CR

OR

AH

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMC S =

WEIGHT I-IORM

(100.0)

0.00

0.00

6.91

23.18

22.76

3.57

0.00

IJ.OO

0.00

19.04

0.00

0.00

13.55

6.P9

0.00

3.60

0.00

0.00

.51

0.00

.74

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

6.97

17.89

22.96

6.58

0.00

0.00

0.00

19.69

0.00

0.00

21.75

0.00

0.00

3.63

0.00

0.00

.52

0.00

.56

103

19.8

48.6

22.5

9.1

.18

.51

3.1

.22

.46

-33

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

H

K

C

U.I.

51.91

29.79

18.31

4 8. IS

34.83

16.99

24.61

8.18

67.21

63.54
1192

PICFUHC PAbALT

11.3614 37.23E.

P. COMUCCI, 1950

(:AP, GOJJAM

5102

TIU2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K2U

P205

H20*

H20-

C02

503

TOTAL

ORIGINAL

ANALYSIS

47.10

• P6

14.42

4.21

7.90

.17

10.46

9.12

2.95

1.19

.10

1.29

.43

0.00

0.00

0.00

0.00

0.00

0.00

100.20

bATER-C02-FKEE

(100.0)

47.83

.87

14.64

4.27

8.02

.17

10.62

9.26

3.00

1.21

.10

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

22.01

.52

7.63

2.94

6.14

.13

6.31

6.52

2.19

.99

.04

.02

.01

0.00

0.00

44.76

ATOMS

NUMBERS (100.0

17.49

6

1

2

5

3

2

24

31

IB

46

05

flO

63

13

56

03

60.12

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AC

cc

MGO/MGO+f-LU

IN Fbr-ilCS =

WEIGHT NORM

(100.0)

0.00

0.00

7.16

21.56

22.90

2.07

0.00

o.oo 0.00

It).12

0.00

0.00

20.10

6.21

0.00

1.66

0.00

0.00

• ?2

0.00

• 7fNON-OXIDATION NORM

(FE2O3 CONVEKTED TO FEO)

0.00

0.00

7.21

16.78

23.09

4.78

0.00

0.00

0.00

18.63

0.00

0.00

27.61

0.00

0.00

1.67

0.00

0.00

.22

0.00

C/FM

OZ

3-COhPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

45.34

39.16

15.50

47.73

35.95

16.32

22.25

B.97

68.78

No. 1192

MINERALOGY: Aphyric, with rare vesicles. Groundmass: Abundant brown augite, uncommon An50, rather

altered olivine, scarce magnetite, some brown glass.

OTHER INFORMATION: Young lava of Aden Series.

No. 1193

MINERALOGY: Groundmass: Abundant An60-55, common

augite, fresh Mg-rich olivine, black glass, rare

magnetite.

OTHER INFORMATION: Locality not identified.

No. 1194

REMARKS: H2O+ and CO together equal 1. 39%; high

alumina, high alkalis.

MINERALOGY: Extremely fine-grained. Groundmass:

An52, magnetite, olivine(?), calcite (signs of alteration).

OTHER INFORMATION: Locality not identified.
1193

nOLERITIC r.ASALT

11.15N 36.50Ei

P. COMUCCI, 1950

KOLETTOA, DANGHILA, GOJJAH

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K20

P2O5

H20*

H2OCO2

SO3

TOTAL

ORIGINAL

ANALYSIS

48.33

.98

17.58

2.38

7.90

.11

7.75

11.49

2.90

.13

.07

.59

.10

0.00

0.00

0.00

0.00

0.00

0.00

100.31

k.ATER-C02-FREE

48.51

.98

17.65

2.39

7.93

.11

7.7H

11.53

2.91

(100.0)

51

TI

AL

Ft3

FE2

MN

MG

CA

NA

ATOMS

WEIGHT

22.58

.59

9.30

1.66

6.14

.09

4.67

8.21

2.15

ATOMS

NUMBERS (100.0)

17.65

.27

7.57

.66

2.42

.03

4.23

4.50

2.06

0.00

0.00

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+F-EO

IN FEMICS =

HEIGHT NORM

(100.0)

0.00

0.00

.77

24.68

34,67

0.00

0.00

0.00

0.00

18.10

0.00

1.61

14.68

3.47

0.00

1.87

0,00

0.00

.15

0.00

.69

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

.78

22.99

34.83

.97

0.00

0.00

0.00

18.41

0.00

0.00

19.99

0.00

0.00

1.88

0.00

0.00

.15

0.00

.60

SI

AL

FM

C

ALK

K

MG

TI

p

C/FM

106

22.7

44.0

27.0

6.3

.03

.58

1.6

.06

.bl

3-COMPONENT

WT.PERCENTS

6.80

4.39

1194

APHYR1C BASALT

P. COMUCCI. 1950

VESUS TAROP (N. SLOPES OF)

SI02

TIU2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P205

H2U+

H20-

C02

503

TOTAL

ORIGINAL

ANALYSIS

48.43

2.22

18.62

6.63

3.98

.25

3.35

6.90

5.36

2.12

.44

1.39

.40

0.00

0.00

0.00

0.00

0.00

0.00

100.09

WATER-C02-FREE

49.27

2.26

18.94

6.74

4.05

.25

3.41

7.02

5.45

2.16

.45

(100.0)

51

TI

AL

FE3

F£2

MN

M&

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

22.63

1.33

9.85

4.64

3.09

.19

2.02

4.93

3.98

1.76

.19

.02

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

17.89

.62

8.11

1.85

1.23

.08

1.85

2.73

3.84

1.00

.14

0

CB

OR

AH

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MG0/MG0*FEO

IN FEKICS -

KEIGH T NORM

(100.0)

0.00

0.00

12.77

32.95

20.78

7.19

0.00

0.00

0.00

8.94

0.00

0.00

3.05

7.37

1.68

4.29

0.00

0.00

.98

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

12.94

26.21

21.05

11.17

0.00

0.00

0.00

9.80

0.00

0.00

13.50

0.00

0.00

4.34

0.00

0.00

,99

0.00

.44

3-COMPONENT

WT.PERCENTS

F 49.49

M 15.67

A 34.89

F 42.46

C 27.61

A 79.93

C

D.I .

37.27

14.74

47.98
1195

D0LER1TIC BASALT

12.36N 37.1OE,

P. COMUCCI, 1950

TARAkA nl3£L6HEMDER«

5102

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

<20

P205

H2U*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

40.54

1.14

16.86

3.53

7.83

.13

7.05

10.74

2.08

1.09

.32

.69

.19

0.00

0.00

0.00

0.00

0.00

0.00

100.19

*ATER-CO2-F«EE

(100.0)

48.88

1.15

16.98

3.55

7.88

.13

7.10

10.81

2.09

1.10

.32

SI

TI

AL

FE.3

FE2

MN

MQ

CA

NA

K

P

H +

HC

s

0

ATOMS

HEIGHT

22.68

.68

8.92

2.47

6.09

.10

4.25

7.68

1.54

.90

.14

.01

.00

0.00

0.00

44.73

ATOMS

NUMBERS <100.0

17.90

7

2

3

4

1

32

33

98

42

04

88

25

49

51

10

60.79

0

CO

OR

AN

NF.

LC

AC

NS

Dl

WO

HY

OL

MT

HM

IL

Tl

RiJ

AP

CC

MGO/MGO+HEO

IN FEI-iICS =

HEIGHT hORM

(100.0)

0.00

0.00

6.50

17.76

33.65

0.00

0.00

0.00

0.00

14.80

0.00

16.08

3.16

b.16

0.00

2.IP

0.00

0.00

.70

0.00

.70

NON-OX I DAT I ON NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

6.54

17.88

33.88

0.00

0.00

0.00

0.00

15.19

0.00

9.66

13.94

0.00

0.00

2.19

0.00

o.oo

.71

0.00

.56

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

110

22.

45.

26.

6.

1.

-15

3-COMPONENT

WT.PERCENT5

F

M

A

F

C

A

52.64

32.67

14.69

44.95

42.50

12.54

No. 1195

MINERALOGY: Medium-grained. Groundmass: Rather

large anhedral augite, An70, scarce altered olivine,

magnetite, glass(?).

OTHER INFORMATION: Locality not identified.

No. 1196

MINERALOGY: Phenocrysts: An70 (center) to An60 (rim).

Groundmass: An50, rather rare augite, iddingsitised

olivine, no glass.

OTHER INFORMATION: Another specimen from this

locality had plagioclase about 10% An more calcic in

both phenocrysts and groundmass.

No. 1197

MINERALOGY: Phenocrysts: An50, anorthoclase, very

large titanaugite, uncommon aegirine-augite, brown

hornblende with rim of augite and magnetite. Groundmass: Plagioclase, augite, magnetite, no olivine.
1196

PORPHYRITIC rJASALT

11.53N 12.O1E, CONSELA,

P. COtfUCCI, 1950

SI02

TI02

AL2O3

FE2O3

FEO

MNU

MGO

CAO

NA20

K 2 0

P2O5

H20*

H20-

C 0 2

S 0 3

TOTAL

ORIGINAL

ANALYSIS

49.06

2.57

15.40

4.34

6.34

. 1 5

5.81

H.84

3.62

1.83

. 3 6

1.32

. 7 3

0.00

0.00

0.00

0.00

0.00

0.00

100.37

V<ATER-C02-FHtE

(100.0)

15.66

4.41

5.91

8.99

51

T I

AL

Ft 3

F £ 2

MN

Mb

CA

NA

K

P

H +

H -

C

S

ATOMS

WEIGHT

22.92

1.54

8.15

3.04

4.93

. 1 2

3.50

6.32

2.69

1.52

. 1 6

. 0 2

. 0 1

0.00

0.00

ATOMS

NUMBERS (100.0 )

18.24

. 7 2

6.75

1.22

1.97

. 0 5

3.22

3.52

2.61

. 8 7

. 1 1

0

CR

OR

A8

AN

NE

LC

AC

NS

D I

WO

HY

OL

MT

HM

I L

T I

RU

AP

CC

MGO/MGU-n-tO

IN FEMC.S =

wtlGHT NOf<K

(100.0)

0.00

0.00

11.02

30.90

2O.fr7

. 1 7

0.00

0.00

0.00

17.47

0.00

0.00

7.59

6.41

0.00

4.96

0.00

0.00

.CO

0.00

. 8 2

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

11.12

26.04

20.84

2.95

0.00

0.00

0.00

18.24

0.00

0.00

15.00

0.00

o.oo

5.00

0.00

0.00

. 8 1

o.oo

. 5 7

S I

AL

FM

1 2 1

2 2

4 2

. 3

.a

3-COMPONENT

tfT.PERCENTS

F

M

A

F

C

A

N

K

C

48.68

26.4H

24.84

42.77

35.40

21.83

?5.33

12.81

61.86

1197

TRACMYDOLtRITt

Il.OOM 36.55E, ENJA-(AKA,

P. COMUCCI. 1950

5IU2

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K 2 0

P2O5

H20 +

H20-

C 0 2

S 0 3

TOTAL

ORIGINAl

ANALYSIS

53.93

1.24

17.82

5.08

3.70

. 1 0

2.43

4.S7

4.66

4.20

0.00

1.49

. 9 3

0.00

0.00

0.00

0.00

0.00

0.00

100.45

*ATER-C02-FKtE

(100.0)

55.01

4.75

4.28

0.00

S I

T I

AL

F t 3

FE2

MN

MCj

CA

NA

K

P

H *

H -

C

S

ATOMS

wEI&HT

25.20

. 7 4

9.43

3.55

2.88

. 0 8

1.47

3.48

3.46

3.49

0.00

. 0 2

. 0 1

0.00

0.00

ATOMS

NUMBERS (100.0 )

19.79

. 3 4

7.71

1.41

1.14

. 0 3

1.33

1.92

3.32

1.97

0.00

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

I L

T I

RU

AP

CC

MGO/MGO+FEO

IN FLMC5 =

WEldHT NORM

(100.0)

0.00

0.00

25.38

36.35

15.54

1.06

0.00

0.00

0.00

7.22

0.00

0.00

2.51

7.53

0.00

2.40

0.00

0.00

0.00

0.00

. 9 1

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

25.63

32.70

15.69

4.34

0.00

0.00

0.00

7.85

0.00

0.00

11.36

0.00

0.00

2.42

0.00

0.00

0.00

0.00

. 3 9

C/FM

QZ

160

31.

31.

3-COMPONFNT

rtT.PERCENTS

F 43.75

M 12.11

A 44.15

F 39.00

C 21.6
119S

PHONOLITL

ll.OON 36.54t , ENJA,<A«A, ijOJjAM

p . cnwucci. iy>o

SIU2

TIo2

AL203

FF203

FEU

KNU

M<30

CAu

NA20

<20

P2O5

H2u*

H20-

C02

S03

TOlAl

ANALYSI

55.04

.50

19.57

3.63

• 93

.22

.44

1.78

8. 86

7.62

.05

.90

1.02

O.CO

0.00

0.00

0.00

0.00

0.00

100.56

ftATER-C02-F«tE

(100.0)

55.80

.51

19.84

3.68

.94

.22

.45

1.80

8.98

7.73

.05

SI

TI

AL

Ft3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

HEIGHT

25.71

.30

10.35

2.54

.72

.17

.27

1.27

6.57

6.33

.02

.01

.01

0.00

0.00

ATOMS

NUMBERS (100.0

19.76

8

6

3

14

28

98

28

07

24

69

17

49

02

D

C'i

OR

AB

AN

NF.

LC

AC

NS

DI

WO

HY

OL

M

H*.

II.

TI

R'J

AP

CC

KLlGHT NOI<M

(100.0)

0.00

0.00

45.76

7.24

0.00

28.G1

0.00

10.67

1.19

4.67

1.1H

0.00

0.00

0.00

o.ro

.96

0.00

0.00

.11

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

46.09

13.03

0.00

25.10

0.00

0.00

4.04

7.62

0.00

0.00

3.05

0.00

0.00

.97

0.00

0.00

.11

0.00

N1GGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

176

3b.

13.

6.

43.

1.

-78

IN F-Lt- K b =

3-COMPONENT

wT.PERCENTS

F 21.21

M 2.0b

A 76.7?

F 19.9H

48.52

41.73

No. 1198

MINERALOGY: Fine-grained, aphyric. Groundmass:

Minute sanidine, common nepheline, green hornblende,

rather large barkevikite, pale-pink cancrinite, very

rare colourless pyroxene, red-brown iron-oxide (cossyrite?).

No. 1199

MINERALOGY: Fine-grained, aphyric. Groundmass:

Minute sanidine (anorthoclase?) common nepheline,

green hornblende, rather large barkevikite, very rare

colourless pyroxene, red-brown iron-oxide (cossyrite?).

No. 1200

MINERALOGY: Very fine-grained, aphyric. Groundmass:

Sodic plagioclase(?), K-feldspar, pale yellow nepheline,

rare aegirine or aegirine-augite, magnetite, glass.
1199

r>HONOLITfc

ll.OOM 36.54E,

P. COMUCC1, 1950

SI02

T102

AL2O3

FE2O3

FEG

MNO

MGU

CAO

NA20

K20

P205

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

56.56

.67

20.60

2.63

1.07

• 25

0.00

2.01

9.33

5.05

.09

.92

1.10

0.00

0.00

0.00

0.00

o.oo 0.00

100.48

1.09

.25

0.00

2.04

9.48

5.13

SI

TI

AL

Ft3

Ft2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

26.42

.40

11.01

1.84

.83

.19

0.00

1.44

6.92

4.19

.04

.01

.01

0.00

0.00

ATOMS

NUMREK S (100.0)

20.11

.18

8.72

.70

.32

.08

0.00

.77

6.44

2.29

.03

0

CB

OS

AR

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

M^O/MGOtFEO

IN FEMC S =

ntl&hT NO W

(100.0)

0.00

0.00

30.39

37.42

0.00

23.1Q

0.00

.27

0.00

0.00

4.01

o.oo 0.00

2.37

.95

1.29

0.00

0.00

.20

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

30.54

32.90

0.00

25.77

0.00

0.00

.07

8.62

0.00

0.00

.60

0.00

0.00

1.30

0.00

0.00

.20

0.00

0.00

SI

AL

FM

190

41

10

K

MG

TI

P

C/FM

QZ

.26

0.00

1.7

.13

.70

-75

3-COMPONENT

WT.PERCENTS

F 20.46

M 0.00

A 79.54

F 18.42

C 10.00

A 71.5 B

N 56.92

K 30.81

C 12.26

1200

PHONOLITE

12.ION 37.52E,

P. C0MUCC1, 1950

AMBA Lit1'), IFA(j. BtGHEMDER

SI02

TI02

AL203

FE2O3

FEO

MNO

MRO

CAO

NA2O

K2O

P2O5

H2O*

H2OC02

SO3

TOTAL

ANALYSIS

60.57

• •v l

17.45

4.61

.50

.06

.84

1.88

5.29

5.94

0.00

1.16

1.05

0.00

0.00

0.00

0.00

0.00

0.00

99. R6

WATEH-C02-FKEE

(100.0)

62.03

. 5 1

.06

SI

TI

AL

FE3

Ft2

MN

MG

CA

NA

<

P

H +

HC

s

ATOMS

WEIGHT

28.30

.31

9.23

3.22

.39

.05

.51

1.34

3.92

4.93

0.00

.01

.01

0.00

0.00

ATUMS

NUMBERS (100.0)

21.83

.14

7.41

1.25

.15

.02

.45

.73

3.70

2.73

0.00

FLIGHT r«OHM

(100.0)

2.31

0.00

36.04

45.95

6.39

0.00

0.00

0.00

0.00

2.48

0.00

l.CO

0.00

.34

4.50

TI

RU

AP

CC

MGO/HGO+I-^U

IN FtMC S =

0

0

0

0

1.

.00

.00

.00

.00

oo'

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

36.37

46.37

6.45

0.00

0.00

0.00

0.00

2.77

0.00

3.98

3.07

0.00

0.00

1.00

0.00

0.00

0.00

0.00

.28

SI

AL

FM

C

ALK

K

MG

TI

P

229

38.9

19.7

7.6

33.8

.42

.24

1.5

0.00

3-COMPONEI4T

WT.PEHCENTS

F 29.74

78.05

10.3?

61.64

40.35

45.31

14.34
1201

NHONOLlTt

12.10* 37.52E,

P. COMUCCI, 1950

l("Ai.,» BEdHEMDER

SI02

TIu2

AL2O3

FE2O3

FEU

MNO

MGO

CAO

NA2C

K2u

P2O5

H2U +

H2OC02

SO 3

TOTAL

ANA

61.

17.

4 .

#

•

.

5.

5 .

0.

1.

1.

;l1

'.6

il

49

1

-,1

54

i6

• 2

DO

^

'6

0.00

0.00

0.00

0.00

0.00

0.00

100. 57

wATEFi-C02-Fr<EE

(100.0)

63.59

.11

18.36

4. 74

.50

.11

.63

.56

5.82

5.57

0.00

SI

TI

AL

Ft3

FE2

MN

M&

CA

NA

K

P

H*

HC

s

ATOMS

HEIGHT

28.90

.07

9.45

3.22

.38

.09

.37

.39

4.20

4.50

0.00

.02

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

22.23

7

1

3

2

0

03

57

25

15

03

33

21

95

49

00

0

Cft

OR

A;;

AM

HE

LC

AC

NS

CI

wo

HY

OL

MT

H-1

IL

TI

R1J

AP

CC

MGO/MGGtFLO

IN FEMC5 =

KtlGHT NOPM

(100.0)

b.09

1.71

33.02

49.36

2.76

0.00

0.00

0.00

0.00

0.00

0.00

1.57

0.00

1.67

3.60

• 21

0.00

0.00

0.00

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVEKTEO TO FEO)

2.46

1.73

33.32

49.81

Z.79

0.00

0.00

0.00

0.00

0.00

0.00

9.67

0.00

0.00

0.00

.22

0.00

0.00

0.00

0.00

.20

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

247

4 2.

19.

2.

35.

0.

4

3-COMPONENT

WT.PERCENT5

F 30.38

M 3.63

A 65.99

F 30.50

C 3.23

A 66.27

H 48.71

K 46.64

C 4.65

No. 1201

MINERALOGY: Very fine-grained, aphyric. Groundmass: Sodic plagioclase(?), K-feldspar, pale yellow

nepheline, rare aegirine or aegirine-augite, magnetite,

glass.

OTHER INFORMATION: Termed "nepheline trachyte"

by Comucci (also 1200).

No. 1202

MINERALOGY: Groundmass: Yellow-brown glass, some

aegirines; microlites anorthoclase, magnetite, and

femics.

OTHER INFORMATION: Locality not identified.

No. 1203

REMARKS: Potassic quartz-trachyte.

MINERALOGY: Phenocrysts: Corroded anorthoclase,

rare aegirine. Groundmass: K-feldspar, augite,

magnetite, quartz(?), plagioclase(?), limonite(?).

OTHER INFORMATION: Locality not identified.
1202

HYALOTRACHYTE

P. COMUCCl. 1950

SI02

TI02

AL203

FE203

FEU

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H2UC02

S03

ORIGINAL

ANALYSIS

62.27

1.08

13.02

2.55

6.76

.If,

.72

4.11

4.02

3.49

.11

1.36

.53

0.00

0.00

0.00

k,ATER-C02-FREE

(100.0)

13.25

2.59

6.88

SI

Tl

AL

Ft3

FE2

MN

M6

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

29.09

.65

6.89

1.7H

5.25

.12

.43

2.94

2.98

2.90

.05

.02

.01

0.00

0.00

ATOMS

NUhBERS (100.0)

22.74

.30

5.60

.70

2.07

.05

.39

1.61

2.85

1.63

.03

Q

CO

OR

AH

AN

NE

LC

AC

NS

Dl

WO

HY

OL

MT

HM

IL

TI

RJ

AP

cc

MGuVMGO-fKtU

FEMICS =

HEIGHT NO^M

(100.0)

14.72

0.00

21.04

34.69

7.24

0.00

0.00

0.00

0.00

11.19

o.no

5.02

0.00

3.77

0.00

2.09

0.00

0.00

.24

0.00

.21

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

12.04

0.00

21.14

34.86

7.28

0.00

0.00

0.00

o.oo

11.36

0.00

10.9B

0.00

0.00

0.00

2.10

0.00

0.00

.25

0.00

.14

SI

AL

FM

230

28.4

32.6

C/FM

QZ

3-COHPONENT

WT.PERCENTS

F 53.OH

M 4.10

A 42.82

F 44.48

34.60

30.03

35.3?

1203

PORPHYRITIC TRACHYRHYOl.ITf

12.45N 37.43E, AMDA GHEORGHIS«

P. COMUCCl, 1950

N.L.. OF GONDAR, bEc-iHEMDER

5102

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

66.19

.91

12.95

5.10

.99

.07

• 55

3.01

3.81

4.24

.26

1.04

1.05

0.00

0.00

0.00

0.00

0.00

0.00

100.17

^ATER-C02-FKEE

(100.0)

13.20

5.20

1.01

51

Tl

AL

Ft3

Ft2

MN

Mo

CA

NA

K

P

H +

HC

S

ATOMS

WEIGHT

30.92

.55

6.85

3.57

.77

.05

.33

2.15

2.83

3.52

.11

.01

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

23.77

.25

5.48

1.3b

.30

.02

.29

1.16

2.65

1.94

.08

0

c

OR

A9

AN

HE

LC

AC

NS

DI

WO

HY

OL

MT

H"A

IL

TI

RU

AP

CC

MGO/MGO*FE0

IN FEMIC5 =

WLl&HT NORM

(100.0)

23.15

0.00

25.62

32.95

5.76

0.00

0.00

0.00

o.oo

3.02

1.70

0.00

0.00

.81

4.66

1.76

0.00

0.00

.58

0.00

1.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

19.60

0.00

25.B7

33.28

5.82

0.00

0.00

0.00

0.00

6.99

0.00

6.07

0.00

0.00

0.00

1.78

0.00

0.00

.59

0.00

.18

SI

AL

FM

C

ALK

<

290

33.4

24.3

14.2

28.1

.47

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F 41.46

M 3.74

A 54.80

F 35.51

C 17.55

A 46.94

N 34.45

K 38.34

C 27.22
1204

HYALOKHYOLITk.

P. C0MUCC1, 1950

AXIUOA, r,QjjAM

SIU2

TIU2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2U

P2O5

H2O*

H2OCOt

SO3

TOTAL

ANALYSIS

68.55

.67

13.82

5.73

.30

.03

.41

.68

3.58

3.20

.11

2.1)6

1.25

0.00

0.00

0.00

0.00

0.00

0.00

100.39

ATER-CO^-FrftE

(100.0)

0

4

5

3

3

61

69

24

90

31

03

42

70

69

30

11

SI

Tl

Al_

FL3

Ft2

MN

Mb

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

32.03

.40

7.31

4.01

.23

.02

.25

.49

2.66

2.66

.05

.02

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

24.57

.18

5.84

1.55

.09

.01

.22

.76

2.49

1.46

.03

0

en

OR

A

n,

AM

NF

LC

AC

N5

DI

WO

HY

OL

M T

H'l

IL

TI

RJ

wLIGHT riO'^h

(100.0)

34.56

3.55

19.54

31.29

2.fi2

o.ro

0.00

0.00

0.00

0.00

0.00

1.05

0.00

0.00

5.92

.72

0.00

.31

NON-OXlDATIJN NORM

(FE2O3 CONVEKTED TO FEO)

31.14

3.59

19.76

31.64

2.85

0.00

0.00

0.00

0.00

0.00

0.00

9.45

0.00

0.00

0.00

1.33

0.00

0.00

NIGGLI

SI

AL

FM

C

ALK

K.

MG

TI

P

C/FM

QZ

349

41.

26.

3.

28.

?..

136*

0.00

3-COMPONfNT

WT.PERCENTS

F 45.61

44.70

5.04

50.26

47.99

42.90

9.1?

No. 1204

MINERALOGY: Finely scoriaceous rock. Groundmass:

Yellow glass, sanidine, magnetite, mica(?), zeolite(?).

OTHER INFORMATION: Locality not identified.

No. 1205

REMARKS: Potassic rock.

MINERALOGY: Phenocrysts: K-feldspar. Groundmass:

Holocrystalline quartz, slightly altered K-feldspar,

some anorthoclase(?), epidote, iron-oxide.

OTHER INFORMATION: Locality not identified.

No. 1206

MINERALOGY: Groundmass: Yellow-brown (partly

devitrified), corroded anorthoclase.

OTHER INFORMATION: Locality not identified.
1205

QUARTZ POkPHYRY

P. COMUCCI. 1950

OF 1FAC,, hEr.HEKDER

SIU2

TI02

AL203

FE2O3

FF.O

MNO

MGO

CAO

NA20

K2O

P2O5

H2O*

H2OCO2

SO3

TOTAL

ANALYSIS

70.63

»?4

11.95

4.91

.30

0.00

• 10

.25

4.78

5.31

0.00

.74

.86

0.00

0.00

0.00

0.00

0.00

0.00

100.07

KATER-CO2-FKEE

(100.0)

12.14

4.99

.30

0.00

.10

.25

SI

TI

AL

Ft3

FL2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

33.00

.14

6.32

3.43

.23

0.00

.Ob

.18

3.55

4.41

0.00

.01

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

25.00

.06

4.98

1.31

.09

0.00

.05

.09

3.28

2.40

0.00

31.96

32.35

MT

HM

IL

TI

RU

AP

cc

MGO/MGO»FEO

IN FEMCS =

.28

2.12

.46

0.00

0.00

o.oo 0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

24.08

0.00

32.27

32.66

0.00

0.00

0.00

0.00

2.08

1.13

0.00

7.32

0.00

0.00

0.00

.47

0.00

0.00

0.00

0.00

.04

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

363

36.2

21.1

1.4

41.3

.47

.04

.9

0.00

.07

113

3-COMPONENT

WT.PERCENTS

F 33.83

1206

HYALONHYOLITt

P. COMUCCI, 1950

SLOl--ES OF KICHA

SI02

TI02

AL203

FE2O3

FEO

MNG

MGO

CAJ

NA20

K2U

P2O5

H20*

H20-

C02

S03

TOTAL

ANALYSIS

72.07

.36

13.97

1.02

1.00

.08

.38

1.25

3.HO

3.70

0.00

2.49

.23

0.00

0.00

0.00

0.00

0.00

0.00

100.35

..ATER-C02-FKEE

(100.0)

14.31

1.04

1.02

SI

TI

AL

Ft3

Ft2

MN

MG

C»

Nh

K

P

H+

HC

S

ATOMS

WEIGHT

33.67

.22

7.39

• 71

.78

.06

.23

.89

2.82

3.07

0.00

.03

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.37

.10

5.80

.27

.29

.0?

.20

.47

2.59

1.66

0.00

0

CB

OR

A1

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

IL

TI

PJ

AP

CC

MflO/*t&O*f to

IN Ftf-;ICS =

v>E_lGHT NOUf

(100.0)

32.94

1.45

22.46

3J.O2

6.37

0.00

0.00

0.00

0.00

0.00

0.00

1.54

0.00

1.5?

0.00

.70

0.00

0,00

0,00

O.PO

.69

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

31.90

1.45

22.51

33.09

6.38

0.00

0.00

0.00

0.00

0.00

0.00

3.97

0.00

0.00

0.00

.70

0.00

0.00

0.00

0.00

.30

4O3

46.1

12.5

TI

P

C/FM

OZ

1.5

0.00

.60

167

3-COMPONENT

wT.PERCENTS

F 20.40

18.76

11.61

69.64

43.43

42.24

14.29
1207

IIYALOKHYULITt

11.38N 37.03E ,

P . COMUCCI. 1^

SIU2

TI02

AL203

FE203

FEO

MNU

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

AI.ALY5I5

73.87

• ?6

12.56

3.28

• 36

0.00

.79

1.59

2.45

"••60

0.00

.27

.20

0.00

0.00

0.00

U.00

0.00

0.00

100.23

I.ATER-C02-FRE.E

(100.0)

74.05

.26

12.59

3.29

.36

0.00

.79

1.59

4.61

0.00

SI

TI

AL

Fh.3

Ft2

MN

M&

CA

NA

K

P

H*

HC

s

ATOMS

HEIGHT

3*. 51

.16

6.65

2.29

.28

0.00

.48

1.14

1.S2

3.82

0.00

.00

.00

0.00

0.00

ATOMS

NUMBERS (100.0

25.66

5

0

1

2

0

07

14

86

10

00

41

59

65

04

00

0

CT

OR

Afl

AM

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

Tl

PU

AP

cc.

Mf.O/MGO + FEO

IN FLMICS =

fttlGhT NOPM

(100.0)

37.37

.64

27.33

20.84

7.93

0.00

0.00

0.00

0.00

0.00

0.00

1.98

0.00

.41

3.01

.49

0.00

0.00

o.no

0.00

1.00

MOM-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

35.25

.64

27.50

20.97

7.98

0.00

0.00

0.00

0.00

0.00

0.00

7.16

0.00

0.00

0.00

.50

0.00

0.00

0.00

0.00

.34

NIGGLI

SI

AL

FM

C

ALK

K.

MG

TI

P

C/FM

OZ

401

40.

21.

9.

28.

1.

0.

186

3-COMPONENT

WT.PERCENTS

F 31.71

29.64

12.95

57.41

28.36

53.24

18.40

No. 1207

REMARKS: Potassic rock.

MINERALOGY: Groundmass: Abundant red-brown glass

(with spherulites), sanidine, corroded anorthoclase(?),

common quartz, phlogopite, magnetite.

No. 1208

REMARKS: Potassic rock.

MINERALOGY: Phenocrysts: Very rare quartz and

sanidine. Groundmass: Holocrystalline quartz and

K-feldspar spherulites, aegirine-augite.

OTHER INFORMATION: Imprecise locality.

No. 1209

MINERALOGY: Fine-medium grained. Groundmass:

Holocrystalline, spherulites, abundant limonite, quartz,

anorthoclase, no femics.
1208

RHY0L1TE

13.12N 38.18E.

P. COMUCCI. 1950

MAI SHAHA VALLEY. SIMIEN» BEGHr.MDER

SI02

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K2U

P2O5

H20*

H20-

C02

S03

TOTAL

OR I 61.-4 Ai

ANALYS11

7i>.25

.43

10.B8

2.60

1.64

.04

0.00

.43

3.76

5.06

0.00

.37

• 16

0.00

o.oo 0.00

0.00

0.00

0.00

100.32

WATER-C02-FREE

(100.0)

75.41

.43

10.60

2.61

1.64

.04

0.00

.43

SI

TI

AL

FE3

Ffc2

MN

M&

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

35.16

.26

5.60

1.82

1.27

.03

0.00

.31

2.79

4.20

0.00

.00

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

26.18

.11

4.34

.68

.48

.01

0.00

.16

2.54

2.25

0.00

0

CB

OR

AP

AM

NE

LC

AC

NS

DI

kiO

HY

OL

MT

H'l

IL

TI

RLJ

AP

CC

MGU/MGO+FEO

HEIGHT NOPM

(1OO.O)

34.01

0.00

30.05

26.25

0.00

0.00

0.00

5.03

0.00

1.91

0.00

.f 5

0.00

1.27

0.00

.f>2

0.00

0.00

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

34.05

0.00

30.20

26.39

0.00

0.00

0.00

0.00

1.34

1.92

0.00

5.28

0.00

0.00

0.00

.82

0.00

0.00

0.00

0.00

FM

cALK

K

MG

TI

P

C/FM

OZ

19.9

2.7

40.6

.47

0.00

1.9

o.oo .14

192

3-COMPONENT

WT.PERCENTS

F 32.47

M 0.00

A 67.53

F 31.43

C 3.19

A 65.38

C

D.I.

40.65

54.70

4.65

1209

RHYOLITt

13.16IM 38.23E,

P. COrtuCCl, 1950

(-DD1S ARIT, SIMlEN

SIU2

TIOZ

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P205

H20 +

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

75.BO

.39

9.56

6.18

.20

0.00

.15

.36

3.20

3.08

.07

1.16

.27

0.00

0.00

0.00

0.00

0.00

0.00

100.42

KATER-C02-FKEE

(100.0)

76.57

.39

9.66

6.24

.20

0.00

3.23

3.11

.07

SI

TI

AL

Ft3

FE2

HU

Mli

CA

NA

IC

P

H*

HC

S

ATOMS

WEIGHT

35.41

.23

5.06

4.32

.16

0.00

.09

.26

2.37

2.56

.03

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

26.57

.10

3.95

1.63

.06

0.00

.08

.14

2.IB

1.38

• 02

HEIGHT NORM

(1C0.0)

4<..9O

.44

lb.44

27.43

1.39

0.00

0.00

0.00

0.00

0.00

0.00

.38

0.00

U.00

6.26

.43

0.00

.17

.15

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

41.28

.45

18.66

27.76

1.41

0.00

0.00

0.00

0.00

0.00

0.00

9.52

0.00

0.00

0.00

• 76

0.00

0.00

.16

o.oo

c

ALK

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F 49.80

48.19

46.39

MGO/MGU+FEO

IN FEMCS =
1210

SCORIACEOuS POkPHYRlTIC ..ASAlT

08.40 K 39.2/E, «ALE'!CMITI,

 C:

0. HltKE-l-lEKLIN. 1950

SI02

TI02

AL.203

FF2O3

FEO

MNO

MGO

CAO

NA20

K?O

P?O5

H2U +

H?UC0<!

SO3

TOTAL

OCItlr.AL

ANALYSIS

43.fcO

1.97

lfa.13

3.70

7.6H

.05

5.48

12.12

3.00

• !1B

.34

.C6

.68

0.00

0.00

0.00

0.00

0.00

0.00

9S.69

*ATER-C02-FREE

(100.0)

45.08

2.03

18.66

3.HI

7.91

.05

5.64

12.4K

3.09

.91

.35

SI

Tl

AL

FL3

FL2

MN

Mb

CA

NA

K

P

H*

Hc

s

0

ATOMS

WEIGHT

20.46

1

9

2

5

3

e2

0

0

la

59

59

97

04

31

66

23

73

15

01

01

00

00

43.77

ATOMS

NUMBERS (100.0

16.65

.56

8.12

1.06

2.45

.02

3.11

4.94

2.21

.43

.11

60.35

ntlCiHT NOW,

(100.0)

0.00

0.00

5.36

13.66

34.34

6.67

0.00

0.00

0.00

20.83

0.00

0.00

JJ.79

b.53

0.00

3.b5

0.00

0.00

.77

o.oo

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

5.40

9.54

34.60

9.12

0.00

0.00

0.00

21.48

0,00

0.00

15.21

0.00

0.00

3.8b

0.00

0.00

.77

0.00

NlbOLl

SI

AL.

FM

C

ALK

K

MG

TI

P

C/FM

UZ

98

23.

39.

29.

7.

3.

-33

3-COMPONENT

WT.PERCENTS

F 54.87

M 26.42

A 18.71

F 41.56

C 44.27

A 14.17

No. 1210

REMARKS: Published summation is 99.69; the error

would appear to lie in either SiC>2 or Al^O,.

MINERALOGY: Phenocrysts: Zoned An72 (center) to

An57 (rim). Groundmass: Mostly glass; rare feldspar,

pyroxene, fresh olivine, magnetite, ilmenite.

No. 1211

REMARKS: P2O5 trace.

MINERALOGY: Penocrysts: Titanaugite, zoned olivine

(Fal6 center; Fa28 periphery). Groundmass: Labradorite-bytownite, abundant magnetite, rare glass,

apatite.

OTHER INFORMATION: Mode: 26% pyroxene phenocrysts,

18% olivine phenocrysts, 56% groundmass.

No. 1212

MINERALOGY: Phenocrysts: Titanaugite, serpentinised

(net pattern) olivine Fa25 An70. Groundmass: Pyroxene,

altered olivine, plagioclase, magnetite, rare biotite,

very rare brown hornblende; tiny calcite veins cut this

rock.

OTHER INFORMATION: Mode: 25% pyroxene phenocrysts,

10% olivine phenocrysts, 5% plagioclase phenocrysts,

50% groundmass, 10% serpentine, talc (from olivine).
1211

OLlVlNE-PYROxtNE

0. HItKE-MERLll.

WADI S.;KYA, DLrtRA BERHAN-DtBRA ilNA ROAD, SHOA

1950

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGu

CAO

NA20

K20

P205

H2U*

H2OC32

SO3

CK2O3

TOTAL

ANALYSIS

44.48

3.06

9.U

6.43

6.01

.18

13.45

12.26

2.56

1.18

0.00

.34

.26

0.00

0.00

.08

0.00

0.00

o.oo

99.90

wATER-COz-FKEE

(100.0)

44.83

3.06

9.69

6.48

6.06

.16

13.56

12.36

2.58

1.19

0.00

SI

Tl

AL

FL3

FE2

MN

MG

C A

NA

K

P

H +

HC

s

ATOMS

HEIGHT

20.78

1.83

5.08

4.50

4.67

.14

8.11

6.76

1.90

.98

0.00

.00

.00

0.00

0.00

ATOMS

NUMHtRS (100.0)

16.63

.86

4.24

1.81

1.88

.06

7.51

4.91

l.flf c

.56

0.00

0

OR

At}

AM

NE

LC

AC

NS

01

WO

HY

OL

MT

HI

IL

TI

RU

AP

CC

MGO/MGO-fFEU

IN FEKICS =

WEIGHT NORM

(100.0)

0.00

0.00

7.04

H.ll

11.30

7.45

0.00

0.00

0.00

39.15

0.00

0.00

11.69

9.41

0.00

5.65

0.00

0.00

0.00

0.00

• 9C

NON-OXlCATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

7.13

.66

11.44

11.64

0.00

0.00

o.oo

41.03

0.00

0.00

22.18

0.00

0.00

5.92

0.00

0.00

0.00

0.00

.73

FM

C

ALK

K

MG

TI

P

C/FM

QZ

57.7

25. Z

6.2

.23

.67

4.4

0.00

.44

-40

3-COMPONENT

WT,

F

M

A

F

C

A

N

K

C

.PERCENTS

41

45

12

43

43

13

16

7

76

.98

.39

.6?

.74

.11

,V>

.00

.37

.6?

1212

OLIVlNE-PYROXENfc BASALT

11.15N 40.10E. 3.5K'-l L. OF

0. HIEKE-I1EKL1N. 1950

BURKA. bATlE. wALLO

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2U5

H20*

H20-

C02

S03

CK.2O3

TOTAL

ORIGINAL

AUALYSI:

44.72

2.13

a.40

4.34

8.82

.56

11.90

ll.frO

1.97

.74

.40

2.f7

1.24

.21

0.00

.10

0.00

0.00

0.00

99.eo

WATEK-C02-FKEE

46.79

2.23

8.79

4.54

9.23

.59

12.45

12.14

2.06'

.77

.42

(100.0)

SI

TI

AL

FL3

FL2

MN

Mb

CA

NA

K

P

H*

H.

C

S

ATOMS

WEIGHT

20.89

1.28

4.44

3.04

6.86

.43

7.18

8.29

1.46

.61

.17

.03

.01

.06

0.00

ATUMS

NUMBERS (100.0)

17.43

• A3

3.86

l.?8

2.88

.19

6.93

4.85

1.49

.37

0

C3

OR

AR

AN

NE

LC

AC

NS

DI

WO

HY

01.

MT

HM

IL

Tl

Ft')

A=>

CC

MGU/MGOfl-LO

IN FLMIC J =

wE.IC.hT NORM

(100.0)

0.00

0.00

4.57

17.43

12.39

0.00

0.00

0.00

0.00

35.25

0.00

1.38

16.77

b.5l!

0.00

4.22

0.00

0.00

.91

.50

.79

NON-OXIOATION NORM

(FE2O3 CONVEKTED TO FEO)

0.00

0.00

4.61

13.17

12.49

2.39

0.00

o.oo

0.00

36.23

0.00

0.00

25.42

0.00

0.00

4.25

0.00

0.00

.92

.50

.66

C/FM

QZ

3-COMPONENT

wT.PERCENTS

F 47.39

M 42.8")

A 9.76

F 47.91

C 42.23

13.77

5.17

ai.06
1213

OLIVINE PYROxEhE bASALT

09.32N 42.1SE* H. FLAM S OK MT. AbDULLA, HARAR^

0. HIEKE-hEKLIfc, 1950

SIO2

TIO2

AL203

FE2O3

FEJ

MNO

MGO

CAO

NA20

K20

P2O5

H20 +

H2UC02

S03

TOTAL

uklclriAL

ANALYSIS

44.92

1.74

13.48

2.68

10.35

.08

9.34

10.72

2.76

• R2

.30

1.82

• R8

0.00

0.00

0.00

0.00

0.00

0.00

99.89

wATER

46.22

1.79

13.87

2.76

10.65

.08

9.61

11.03

2.84

.84

.31

SI

TI

AL

FE3

FL2

MN

MG

CA

NA

K

P

H +

HC

S

ATOMS

WEIGHT

20.99

1.04

7.13

1.87

8.05

.06

5.63

7.66

2.05

.68

.13

.02

.01

0.00

0.00

ATOMS

NUMBERS (100.0

17

6

3

5

4

2

.12

.50

.05

.77

.30

.03

.31

.38

04

40

10

0

CH

OR

AT

AN

NF

LC

AC

NS

DI

WO

HY

OL

MT

WA

IL

TI

RU

AD

CC

MGO/MGO+FEO

I;M FEMCS =

WEIGHT MOKM

(100.0)

0.00

0.00

5.00

15.95

22.57

4.40

0.00

0.00

0.00

24.79

O.CO

0.00

19.22

4.01

0.00

3.40

0.00

0.00

.67

0.00

• 6B

NON-OXIDATION NORM

(FE2O3 cONVFrtTED TO FEO)

0.00

0.00

5.02

12.84

22.69

6.15

0.00

0.00

0.00

25.21

0.00

0.00

23.99

0.00

0.00

3.41

0.00

0.00

.68

0.00

.60

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

95

16.

52.

24.

6.

2.

-32

3-COMPONENT

WT.PERCENTS

F 50.21

M 35.99

A 13.80

47.68

}<J«22

13.10

NO. 1213

REMARKS: Published summation is 99.86.

MINERALOGY: Phenocrysts: Titanaugite, fresh olivine

(2V = 84°). Groundmass: An65, titanaugite, olivine,

magnetite, ilmenite.

No. 1214

MINERALOGY: Phenocrysts: Microphenocrysts: augite,

olivine Fa26, almost wholly iddingsitised with serpentine borders. Groundmass: Labradorite, pyroxene,

olivine, abundant yellow-ochre glass, common magnetite,

octahedra.

OTHER INFORMATION: Mode: 21% augite microphenocrysts, 3% olivine microphenocrysts, 35% pyroxene,

olivine, magnetite, 26% glass, 6% plagioclase, 9%

serpentine (from olivine).

No. 1215

REMARKS: Published summation 100.28.

MINERALOGY: Phenocrysts: Zoned An83 (center) to

An54 (rim). Groundmass: Extremely fine-grained An70,

augite, olivine, iron-oxides.

OTHER INFORMATION: The locality of this specimen

is suspect, as the Entotto Range is entirely formed of

alkali rhyolite and trachyte lavas and tuffs (eg. , see

1235).
1214

LIMBUKGITIC BASALT

11.1114 39.59E, 3KM <l. OF [ATIEi

0. HItKE-MEKLIN. 1950

SIU2

TI02

AL2O3

FE2O3

FED

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

S03

CRiO3

TOTAL

ORIGINAL

ANALYSIS

45.51

1.27

12.45

10.25

3.34

.18

7.38

12."47

2.28

1.27

.07

1.91

1.32

0.00

0.00

.06

0.00

0.00

0.00

99.76

WATER-C02-FREE

(100.0)

47.18

1.32

12.91

10.63

3.46

.19

1.32

.07

ATOMS

WEIGHT

TI

AL

FES

FE2

ATOMS

NUMBERS (100.0)

Q

CB

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

R'J

AP

CC

MGO/MG0«KL0

IN FtK.ICS =

WEIGHT NORM

(100.0)

0.00

0.00

7.79

19.30

20.68

.40

0.00

0.00

0.00

33.59

0.00

0.00

2.47

7.98

5.14

2.50

0.00

0.00

.16

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

7.96

9.36

21.11

6.00

0.00

0.00

0.00

36.52

0.00

0.00

16.34

0.00

0.00

2.55

0.00

0.00

.16

0.00

.55

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F 55.42

M 30.10

A 14.4fl

F 45.90

C 42.11

A 11.99

1215

PORPHYRITIC ^ASALT

C9.O3N 38.45E, tiELO..,

0. HItKE-MERLIN. 1950

ENTOTTO MARIAM, ADDIS ABAJ A , SHOA

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20+

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

45.52

1.82

21.12

2.68

6.95

.07

4.42

11.86

2.67

.67

.26

1.55

.62

0.00

0.00

0.00

U.00

0.00

0.00

100.21

V.ATER-C02-FREE

(100.0)

46.43

1.86

21.54

2.73

7.09

.07

4.51

12.10

2.72

.68

.27

SI

TI

AL

FL3

FE2

MN

MG

CA

NA

K

P

H +

HC

s

ATOMS

HEIGHT

21.27

1.09

11.17

1.87

5.40

.05

2.67

8.48

1.9S

.56

.11

.02

.01

0.00

0.00

ATOMS

NUMBERS (100.0

16.96

9

2

2

4

1

51

28

75

17

02

46

74

93

32

08

HEIGHT NORM

(100.0)

0.00

0.00

4.05

20.78

44.51

1.25

0.00

0.00

0.00

11.51

0.00

0.00

9.83

3.97

0.00

3.52

0.00

0.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

4.07

17.72

44.74

2.97

0.00

0.00

0.00

11.80

0.00

0.00

14.57

0.00

0.00

3.54

0.00

0.00

FM

cALK

34

29

7

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F 55.3«

M 25.42

A 19.21

F 38.78

C 47.76

A 13.45

N 17.57

K 4.41

C 78.03

MGO/MGO+FEO

IN FEKICS =
1216

P0RPHYRIT1C bASALT

1O.O5N 42.52E, MT. IUDIDLEI,

0 . HIEKE-KEkLIN, 1950

GOKTI , HARARGE

SIOZ

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K 2 0

P2O5

H20 +

H2UC0 2

S 0 3

TOTAL

OkltlNAi

ANALYSIS

46.06

1.82

15.72

3.40

9.46

. 1 1

6.35

9.00

3.23

1.21

. 3 4

2.20

. 8 4

0.00

0.00

0.00

0.00

0.00

0.00

99.74

WATER-C02-FREE

(100.0)

47.63

1.88

16.26

3.52

9.78

. 1 1

6.57

9.31

3.34

1.25

.35

SI

Tl

AL

F E3

FE2

HN

MG

CA

NA

K

P

H *

H -

C

S

0

ATOMS

WEIGHT

21.52

1.09

8.32

2.38

7.35

. 0 9

3.83

6.43

2.40

1.00

. 1 5

. 0 3

. 0 1

0.00

0.00

45.15

ATOMS

NUMBERS (100.0 )

17.57

. 5 2

7.07

. 9 8

3.02

. 0 4

3.62

3.68

2.39

. 5 9

. 1 1

60.42

0

CB

OR

A a

AN

NE

LC

AC

NS

D I

WO

HY

OL

MT

H*t

I L

T I

RU

AP

cc

MGO/MGOFL O

lit FLi'iICS =

WEIGHT NORM

(100.0)

0.00

0.00

7.41

2b.12

25.63

1.73

0.00

0.00

0.00

15.22

0.00

0.00

15.44

5.11

0.00

3.57

0.00

0.00

. 7 7

0.00

. 6 4

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

7.46

21.22

25.80

3.95

0.00

0.00

0.00

15.59

0.00

0.00

21.62

0.00

0.00

3.60

0.00

0.00

. 7 7

0.00

. 5 1

NIGGLI

S I

AL

FM

C

ALX

K

MG

TI

P

C/FM

QZ

1 0 7

2 1 .

4 6 .

2 2 .

9 .

3 .

- 2 9

3-COMPONENT

WT.PERCENTS

F 54.3H

M 26.85

A 18.77

F 48.90

C 34.22

A 16.88

NO. 1216

MINERALOGY: Phenocrysts: An64, not zoned with the

exception of a few individual crystals (all in the

bytownite-labradorite range); zoned olivine (Fa40 center

to Fa30 rim), with iddingsitised margins. Groundmass:

An64, completely iddingsitised olivine, augite, common

iron-oxides, rare apatite.

No. 1217

REMARKS: CC>2 trace.

MINERALOGY: Phenocrysts: Large (1 cm), zoned An63

(center) to An58 (rim). Groundmass: Minute plagioclase

crystals, altered femics, abundant minute magnetites.

No. 1218

MINERALOGY: Scoriaceous grey lava. Penocrysts:

Zoned An70 (center) to An58 (rim), augite, altered

olivine (2V - 86°). Groundmass: Plagioclase, augite,

altered olivine, magnetite, ilmenite.
1217

PORPHYRITIC u

09.51N 39.47E

0. HIEKE-MERLlh

ALT

EiELOk' DEr>RA S1NA.

1950

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

46.36

2.99

17.10

4.54

7.40

.07

4.02

8.16

3.51

2.36

.63

1.16

1.62

0.00

0.00

0.00

0.00

0.00

0.00

99.92

WATER-C02-FREE

(100.0)

47.72

3.08

17.60

4.67

7.62

.07

4.14

8.40

3.61

2.43

.65

SI

TI

AL

Ft3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

21.66

1.79

9.05

3.18

5.75

.05

2.42

5.83

2.60

1.96

.27

.01

.02

0.00

0.00

ATOMS

NUMBERS (100.0)

17.59

.85

7.65

1.30

2.35

.02

2.28

3.32

2.58

1.14

.20

0

CB

OR

A3

AN

NF

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMItS =

HEIGHT NORM

(100.0)

0.00

0.00

14.39

26.41

24.59

2.29

0.00

0.00

0.00

10.82

0.00

0.00

7.46

6.79

0.00

5.H4

0.00

0.00

1.42

0.00

.72

NON-OXIDATION NORM

(FE203 CONVEkTED TO FEO)

0.00

0.00

14.52

21.21

24.81

5.25

0.00

0.00

0.00

11.32

0.00

0.00

15.56

0.00

0.00

5.89

0.00

0.00

1.43

0.00

.46

51

AL

FM

C

ALK

117

25

39

22

12

3-C0MP0NENT

WT.PERCENTS

F 54.70

M 18.4?

A 26.89

F 45.9H

C 31.42

A 22.60

N 25.02

K 16.02

C 58.16

1218

PORPHYRITIC BASALT

10.ION 41.40E. (IT. AJELtl,

0 . HIEKE-I-ERL1N> 1950

SI02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2U5

H2O*

H2OCO2

SO3

ORIGINAL

ANALYSIS

46.47

2.27

16.45

5.92

6.21

.16

6.21

10. B2

3.03

.86

.33

.88

.30

0.00

0.00

WATER-C02-FREE

47.07

2.30

16.66

6.00

6.29

.16

6.29

10.96

3.07

(100.0)

SI

TI

AL

FE3

FE2

MN

MCj

CA

NA

ATOMS

WEIGHT

21.71

1.36

8.70

4.14

4.83

.12

3.75

7.73

2.25

ATOMS

NUMBERS (100.01

17.33

.64

7.23

1.66

1.94

.05

3.46

4.32

2.19

0.00

0.00

0

CR

OP.

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HI

IL

TI

RK

AP

CC

MGO/MGO + I-EOIN FEhlCS =

WEIGHT NORM

(100.0)

0.00

0.00

5.16

26.02

29.08

0.00

0.00

0.00

0.00

ltt.59

0.00

• 77

6.58

t>.71

0.00

4.36

0.00

0.00

.73

0.00

.87

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

5.22

19.82

29.41

3.52

0.00

0.00

0.00

19.67

0.00

0.00

17.21

0.00

0.00

4.41

0.00

0.00

.74

0.00

.55

SI

AL

FM

C

ALK

106

22

43

26

8

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 54.57

M 27.94

A 17.50

F 45.19

C 40.31

A 14.49

N 20.60

K 5.85

C 73.56
1219

r ASALT DYM: dt> :

11.06U 39.39L, KOv

0. H]tKt-',ERLII(, 1950

LiASALTIC TUFFS)

A-LtSSlt RUAb, kALLO

SI02

TI02

AL2O3

FF203

FED

MMu

MGU

CAO

NA20

K2U

P2O5

H20+

H?UC02

S03

TOTAL

URIC-INAl

ANALYSIS

47.04

2.28

lb.37

3.72

9.17

.OB

5.51

y.j"»

3.65

1.3R

.43

.fi6

.58

0.00

0.00

0.00

0.00

0.00

0.00

99.91

HATER-C02-FKEE

(100.0)

47.77

2

15

3

9

5

9

3

1

32

61

78

31

OH

60

99

71

40

44

SI

TI

AL

FE3

Ft2

MN

MCJ

CA

NA

K

P

H+

HC

S

0

ATOMS

HEIGHT

21.98

1.37

8.13

2.60

7.13

.06

3.32

7.03

2.71

1.15

.19

.01

.01

0.00

0.00

44.23

ATOMS

NUMBERS (100.0

17.66

.64

6.80

1.05

2.RR

.03

3.09

3.96

2.66

.66

.14

60.42

0

CR

OR

AT

AN

NF

LC

AC

NS

DI

WO

HY

OL

MT

IL

TI

RU

AP

CC

•'GO/MGG+FEO

IiN FtMC S =

nLIGHT NOI'M

(100.0)

0.00

0.00

ti.3O

23.97

21.77

4.03

0.00

0.00

0.00

20.76

0.00

0.00

10.32

b.49

o.no

4.39

0.00

0.00

.95

0.00

.64

KON-OXIDATIJN NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

8.36

19.77

21.92

6.44

0.00

0.00

0.00

21.35

0.00

o.oo

16.78

0.00

0.00

4.43

0.00

0.00

.96

0.00

.49

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

uZ

110

21.1

43.9

24.7

10.3

.20

.44

4.0

.43

.56

-32

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K.

C

D.I.

55.01

23.52

21.47

46.43

35.45

18.12

24.55

9.2K

66.17

70.05

No. 1219

MINERALOGY: Fine-grained, flow textured. Phenocrysts: Rare An86 (center) to An57 (rim), very rare

serpentinised olivine. Groundmass: An6l, pyroxene,

olivine, magnetite, yellow glass.

No. 1220

MINERALOGY: Flow-texture. Phenocrysts: Augite,

altered olivine. Groundmass: An70, augite, magnetite,

green nodules (chalcedony?).

No. 1221

MINERALOGY: Phenocrysts: Abundant zoned An68

(center) to An34 (rim), rare olivine with iddingsitised

borders. Groundmass: Plagioclase, pyroxene, olivine,

common magnetite, some ilmenite, rather common

apatite, secondary calcite.
1220

OLIVlUE-PYRuXLNE bASALT

11.13N 39.55Ei bATIE-'

0. HIEKE-MEKLIN, 1950

,T. RARUD PASS. NEAR L. ARDIBBO, WALLO

SI02

T102

AL203

FE2O3

FEO

MNO

MGO

CAU

NA20

K2O

P2O5

H2O+

H2OCOd

S03

TOTAL

URIC.IilAl

ANALYSIS

47.22

4.01

12.49

8.05

5.11

.20

6.40

10.06

2.62

1.43

.22

.60

1.20

0.00

0.00

0.00

0.00

0.00

0.00

99.61

WATER-C02-FREE

(100.0)

48.28

4.10

12.77

8.23

5.22

.20

SI

Tl

AL

FL3

FL2

MN

Me

CA

NA

K

ATOMS

*EI6HT

22.06

2.40

6.61

5.63

3.97

.15

3.86

7.19

1.94

1.19

ATOMS

NUhBfc'RS (100.0)

17.92

1.15

5.59

2.30

1.63

.06

3.63

4.09

1.93

.69

0.00

0.00

R

R

N

E

C

C

s

I

Y

L

T

L

I

J

D

IN FEMCS =

wtlGHT NORM

(100.0)

2.48

0.00

8.66

22.71

18.46

0.00

0.00

0.00

0.00

24.40

0.00

5.02

O.CO

5.66

4.34

7.78

0.00

0.00

.49

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FtO)

0.00

0.00

8.80

23.07

18.76

0.00

0.00

0.00

0.00

26.30

0.00

1.73

12.94

0.00

0.00

7.90

0.00

0.00

.50

0.00

.58

51

AL

FM

C

ALK

C

MG

TI

P

C/FM

113

17.6

48.2

25.9

8.3

7.2

3-COMPONENT

WT.PERCENTS

F 55.74

M 77.11

A 17.15

F 48.26

C 36.89

A 14.85

N 18.57

K 10.13

C 71.30

1221

P0RPHYR1T1C uASA

12.38N 4212h .

0 . HItKE-t-.ERLINi

buRE,

1950

»EST OF ASSAtt

SI02

TI02

AL2O3

FE203

FEO

MMO

MOO

CAU

NA20

KP.0

P2O5

H20*

H20-

C02

S03

TOTAL

ANALYSIS

47.56

2.74

15.95

3.06

9.91

.22

3.72

10.36

3.67

1.30

.73

.22

.16

.18

0.00

0.00

0.00

0.00

0.00

99.78

wATER-COz-F

(100

47.93

2.76

16.08

3.08

KEE

.0)

SI

TI

AL

Ft3

FE2

MN

Mti

CA

NA

K

ATOMS

WEIGHT

22.22

1.64

8.44

2.14

7.70

.17

2.24

7.40

2.72

1.08

ATOMS

NUMBERS (100.0)

17.78

.77

7.03

.86

3.10

• 07

2.08

4.15

2.66

.62

0

CH

OH

AB

AN

NF

LC

AC

N5

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGU/MGO+FEO

IN FEhlCS =

WEIGHT NORM

(100.0)

0.00

0.00

7.75

27.53

23.30

2.04

0.00

0.00

0.00

19.21

0.00

0.00

b.45

4.47

0.00

5.23

0.00

0.00

1.61

.41

.51

NON-OXIDATION NORM

IFE203 CONVERTED TO FEO)

0.00

0.00

7.79

24.12

23.44

3.99

0.00

0.00

0.00

19.63

0.00

0.00

13.73

0.00

0.00

5.26

0.00

0.00

1.62

.42

.40

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

115

2 2. 8

39.O

26.9

10.7

.19

.34

5.0

.75

.68

-28

3-COMPONENT

KT.PERCENTS

F 5<5.88

M 17.17

A 22.95

f 45.83

C 36.61

A 17.56

N 73.94

K 8.48

C 67.58
1222

ApHYRIC BASALT

09.34N 42.14E,

0. HIEKE-C.ERLIN,

JARSAGORO.

1950

N. FLANKS MT. ABDULLA, HARARGE

SI02

TI02

AL203

FE203

FEO

MNO

MGU

CAO

NA20

K2O

P2U5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

47.88

2.43

14.01

3.62

10.08

• 07

5.39

9.64

2.14

.66

.52

2.20

1.26

.06

0.00

0.00

0.00

0.00

0.00

99.96

VvATER-C02-Fr!EE

(100.0)

49.65

2.52

14.53

3.75

10.45

.07

5.59

10.00

2.22

.68

.54

SI

TI

AL

Ft3

Ft2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

22.37

1.46

7.41

2.53

7.84

.05

3.25

6.89

1.59

.55

.23

.03

.01

.02

0.00

45.74

ATOMS

NUMBERS (100.0)

16.40

.70

6.35

1.05

3.?5

.02

3.09

3.97

1.60

.32

.17

61.08

0

CB

OR

AB

AN

NE

LC

AC

NS

01

WO

HY

OL

MT

HM

IL

TI

RU

AP

ccMGU/MGO+FtO

IN FEMICS -

wLlGHT NORM

(100.0)

4.23

0.00

4.05

IB.80

27.61

o.oo 0.00

0.00

0.00

15.22

0.00

1 8. 5 3

0.00

5.45

0.00

4.78

0.00

U.00

1.18

.14

.60

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

.28

0.00

4.08

18.94

27.81

0.00

0.00

0.00

0.00

15.62

0.00

27.13

0.00

0.00

0.00

4.81

0.00

0.00

1.19

.14

.47

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

116

20.

4 7.

25.

6.

4.

-6

3-COMPONENT

WT.PERCENTS

F 62.59

M 24.62

A 12.79

F 52.41

C 36.88

A 10.71

No. 1222

REMARKS: Hieke-Merlin (1950) gives for this analysis

two summations: 99-46% on p. 16 and 99.94% on p. 26;

neither agrees with the total of oxide values.

MINERALOGY: Groundmass: Zoned An62 (center) to

An54 (rim), augite, very abundant magnetite, partly

devitrified brown glass, some ilmenite, calcite in

cavities.

No. 1223

REMARKS: Published summation is 99.87; CO, trace.

MINERALOGY: Groundmass: Zoned An68 (center) to

An56 (rim), Fe-rich augite, scarce altered olivine,

magnetite, ilmenite, some calcite-filled vesicles.

No. 1224

REMARKS: Republication of analysis 1151 (see remarks

under 1151 for manner of re-adjusting some oxide values).

MINERALOGY: Extremely fine-grained. Phenocrysts:

Very rare An6l-59. Groundmass: Plagioclase,

pyroxene, magnetite, green glass, very rare olivine.
1223

APHYRIC BASALT

10.44N 42.34E, AISHA

0. HItKE-f.ERLIN, 1950

SIO2

TI02

AL2O3

FE203

FEU

MNU

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

Okl&IMAL

ANALYSIS

50.32

2.28

12.70

4.00

10.51

.11

5.38

9.60

2.94

• 83

.35

.60

.24

0.00

0.00

0.00

0.00

0.00

0.00

99.P6

WATER-C.02-FREE

(100.0)

50.82

2.30

12.83

4.04

10.61

.11

5.43

9.70

2.97

.84

.35

SI

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

H»

HC

s

ATOMS

WEIGHT

23.51

1.37

6.72

2.80

8.17

.09

3.25

6.86

2.18

.69

.15

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

18.86

.64

5.61

1.13

3.30

.03

3.01

3.86

2.14

.40

.11

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

R'J

AP

CC

MGO/MGO+FEO

IN FEMICS =

HEIGHT NORM

(100.0)

2.2a

0.00

4.96

25.17

19.16

0.00

0.00

0.00

0.00

22.25

0.00

15.15

0.00

5.87

0.00

4.37

0.00

0.00

.77

0.00

.59

NUN-OXIDATION NORM

<FE2O3 CONVERTED TO FEO)

0.00

0.00

5.00

25.37

19.31

0.00

0.00

0.00

0.00

22.85

0.00

16.46

5.83

0.00

0.00

4.40

0.00

0.00

.78

0.00

SI

AL

FM

C

ALK

122

18.2

48.5

25.1

8.2

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

61.33

22.74

15.93

52.04

34.43

13.5?

21.99

6.21

71.80

1224

APHYRIC bASALT <REPUHLIC*TION OF 1151**)

O8.3ON 42.53E. MT. FARSO, DAGAMED O ROAD.

0. HIEKE-KERL1N, 1950

SI02

TI02

AL2O3

FE2O3

FEO

MNU

MGO

CAO

NA20

K20

P2O5

H20+

H20-

C02

S03

TOTAL

ORlGltjAL

ANALYSIS

50.41

2.58

15.69

3.26

9.53

.22

5.02

9.28

2.44

1.12

.25

.24

0.00

.36

0.00

0.00

0.00

0.00

0.00

100.40

WATER-C02-FREE

(loo.o)

50.51

2.59

15.72

3.27

9.55

.22

5.03

9.30

2.44

1.12

.25

SI

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

H +

HATOMS

HEIGHT

23.55

1.55

8.30

2.28

7.41

• 17

3.03

6.63

1.81

.93

.11

.00

0.00

ATOMS

NUMBERS (100.0)

18.61

6

2

2

3

1

72

83

91

95

07

77

67

75

53

08

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

wo

HY

OL

MT

H

M.

IL

TI

RJ

AP

CC

MGO/MGO*KLO

in FEfilCS =

WtlGHT NORM

(100.0)

4.01

0.00

6.62

20.65

2B.48

0.00

0.00

0.00

0.00

11.40

0.00

17.P5

0.00

4.73

0.00

4.e9

0.00

0.00

.55

.fl2

.60

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

.57

0.00

6.66

20.78

28.65

0.00

0.00

0.00

0.00

11.68

0.00

25.35

0.00

0.00

0.00

4.92

0.00

0.00

.55

.82

.47

3-COMPONENT

WT.PERCENTS

F 59.85

M 23.49

A 16.66

F 49.90

C 36.21

A 13.89

N 19.00

K 8.72

C 72.27
1225

APHYRI C BASALT (tftPUPLICATION OF 1152)

09.16N 41.45b. w« SUMMIT MT. GAKAWJLAT A (TOP OF SUCCESSION) »•*

0. HltKE^.ERLlN. 1950

SI02

TI02

AL2O3

FE2O3

FF.0

MNO

MGO

CAO

NA20

K20

P2O5

H2U*

H20-

C02

S03

TOTAL

JRIC.IMAL

ANALYSIS

51.02

.98

15.40

2.72

10.21

.19

5.04

8.94

2.73

1.32

.76

1.10

0.00

0.00

o.oo

0.00

0.00

0.00

0.00

100.41

wATER-C02-F«EE

(100.0)

51.37

.99

15.51

2.74

10.28

.19

5.08

9.00

2.75

1.33

.77

SI

TI

AL

F£3

FL2

MN

Mb

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

23.84

.59

8.15

1.90

7.94

.15

3.04

6.39

2.03

1.10

.33

.01

0.00

0.00

0.00

44.96

ATUMS

NUMbERS (100.0)

18.8"

6

3

2

3

1

2"

7

7(

It

0

7

5

9(

6

2<

61.01

0

cn

OR

AB

AN

NF

LC

AC

N5

DI

WO

HY

OL

MT

HM

IL

TI

R:J

An

CC

MGO/MGOtFEO

IN FLKK.5 =

fttlGHT NORM

(100.0)

1.29

0.00

7.K7

23.31

26.01

0.00

0.00

0.00

0.00

U.B6

0.00

22.13

0.00

3-98

0.00

1.87

0.00

0.00

1.67

0.00

.52

NON-OXIDATION NORM

(FE2O3 CONVERTER TO FEO)

0.00

0.00

7.91

23.43

26.15

0.00

0.00

0.00

0.00

12.06

0.00

22.16

4.72

0.00

0.00

1.88

0.00

0.00

1.68

0.00

.43

NIGGLI

SI

AL

FM

C

ALK

K

M3

TI

P

C/FM

01

126

2 2.

45.

23.

8.

1.

-9

3-C0MP0NENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

58.72

22.89

18.39

49.88

34.49

15.67

21.02

10.16

68.02

No. 1225

REMARKS: Republication of analysis 1152, but under

different locality; three types of basalt from this region

are discussed, but the analysed one is not distinguished.

No separate determination of H-O-.

MINERALOGY: Very fine-grained. Groundmass:

Labradorite-bytownite, augite, rare altered olivine,

yellow glass, magnetite, ilmenite.

No. 1226

MINERALOGY: Fine-grained, flow-textured. Groundmass: An60-58, pyroxene, rarer olivine, magnetite,

apatite; geodes bearing pyroxene, biotite, brown hornblende (2V = 80°).

No. 1227

MINERALOGY: Phenocrysts: Anorthoclase (corroded

crystals with secondgeneration anorthoclase and glass

on rims), rare sanidine, aegirine-augite. Groundmass:

K-feldspar, plagioclase, aegirine-augite, common

magnetite, some apatite.
1226

BASALT DYKE (IN ijASEI^ENT)

09.28N 41.55E» *GATE CF HARAR*

0. HIEKE-MERLIN, 1950

HARAR-OIRE DArtA ROAD. HARARGE

SI02

TIU2

AL2O3

FE2O3

FEO

MNO

MGU

CAU

NA20

K20

P205

H20 +

H20-

C02

503

TOTAL

ORIGIMA L

ANALYSIS

51.56

3.04

13.07

2.76

9.82

.26

4.65

fa.36

3.06

1.78

.54

.58

.t)6

o.no

0.00

0.00

0.00

0.00

0.00

100.34

WATER-C02-FKEE

(100.0)

52.13

3.07

13.22

2.79

9.93

.26

4.70

8.45

3.09

1.80

SI

Tl

AL

FE3

F£2

Mm

M3

CA

NA

K

P

H*

HC

S

ATOMS

HEIGHT

24.09

I.a2

6.92

1.93

7.63

.20

2.80

5.97

2.27

1.48

.24

.01

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

19.24

.85

5.75

.78

3.07

.08

2.59

3.34

2.21

.85

.17

IN FEMCb =

WclGHT NORM

(100.0)

2.91

0.00

10.66

26.23

16.82

0.00

0.00

0.00

0.00

1B.1H

0.00

14.11

0.00

4.06

0.00

5.S3

0.00

(J.OO

1.19

0.00

.58

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

10.72

26.37

16.91

0.00

o.oo

0.00

0.00

18.56

o.oo

20.26

.10

0.00

o.oo

5.86

0.00

0.00

1.20

0.00

.46

51

AL

FM

C

ALIC

K

MG

TI

p

C/FM

OZ

135

20.1

45.7

23.5

10.7

.28

.40

6.0

.60

.51

-8

3-COMPONENT

WT.PERCENTS

F 57.00

M 21.07

48.80

32.43

18.77

23.18

13.48

63.33

1227

TRAC^IYTIC dLLUio TUFF

09.41N 39.42E, OEf.RA

0 . HlfcKE-MEKLIN, 1V53

SIU2

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P205

H20+

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

63.92

.56

16.86

2.34

1.42

.09

• 41

1.36

8.00

3.92

.16

.56

.60

0.00

0.00

0.00

0.00

0.00

0.00

100.20

WATER-C02-FKEE

(100.0)

64.54

.57

17.02

2.36

1.43

.09

.41

1.37

8.08

3.96

SI

TI

AL

FE3

FE2

MN

»C

CA

NA

<

ATOMS

WEIGHT

29.86

.34

8.92

1.64

1.10

.07

.25

.97

5.94

3.25

ATOMS

NUMBERS (100.0)

22.41

.15

6.97

.62

.42

.03

.21

.51

5.44

1.75

0.00

0.00

0

C<3

OR

AR

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H»1

IL

TI

RU

AP

CC

PGO/MGO+FEO

IN FEMCS =

iXLlGHT NORM

(100.0)

.69

0.00

23.45

65.50

0.00

0.00

0.00

2.f,6

0.00

3.50

.66

0.00

0.00

2.10

0.00

1.07

0.00

0.00

.35

0.00

.67

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

23.56

65.80

0.00

0.00

0.00

0.00

.70

5.13

0.00

2.03

1.34

0.00

0.00

1.08

0.00

0.00

.36

0.00

.20

3-COMPONENT

WT.PERCENTS

F 23.37

M 2.55

A 74.08

F 22.07

C 7.9H

A 69.95

N 60.24

K 29.52

C 10.24

.1. 90.17
1228

P0RPHYRIT1C TRACHYTE

11.19W 39.40E, UESSIE-QUORAM hoADt NEAR L. HAyk

0. HIEKE-C.ERLIN. 1953

SI02

TI02

AL2O3

FF2O3

FEO

MNO

•AGO

CAO

NA20

K20

P205

H20*

H20-

C02

503

TOTAL

ORIGIHA L

ANALYSIS

64.58

1.14

15.81

1.64

2.95

.10

.52

2.52

5.78

3.72

.34

.65

.27

.30

0.00

0.00

0.00

0.00

0.00

100.32

HATEH-C02-FKEE

(100.0)

65.17

1.15

15.95

1.65

2.98

.10

.52

2.54

5.83

3.75

• 34

SI

Tl

AL

Ffc3

FE.2

MN

MG

CA

NA

<

P

H +

HC

S

0

ATOMS

WEIGHT

30.17

.68

8.37

1.15

2.29

.08

.31

1.80

4.29

3.09

.15

.01

.00

.08

0.00

47.85

ATOMS

NUMBERS (100.0)

22.80

6

3

1

30

58

44

87

03

27

95

96

68

10

62.01

htlGHT KOKM

(1OO.O)

11.57

0.00

22.18

49.32

6.17

0.00

0.00

0.00

0.00

2.12

0.00

2.t2

0.00

2.40

0.00

2.IB

0.00

0.00

.75

.69

NON-OX I OAT I ON NORM

(FE2O3 CONVERTED TO FEO)

9.86

0.00

22.25

49.48

6.19

0.00

0.00

0.00

0.00

2.19

0.00

6.41

0.00

0.00

0.00

2.18

o.oo 0.00

.75

.69

NI

SI

AL

FM

C

AL

K.

MG

TI

P

C/

oz

IN FLMIC S =

3-COMPONENT

WT.PERCENTS

F 31.42

M 3.56

A 65.02

F 27.63

C 15.17

A 57.19

N 48.09

K 30.95

C 20.97

No. 1228

MINERALOGY: Cryptocrystalline. Groundmass: Glass

with An45 and magnetite, scarce apatite, calcite,

altered pyroxene(?).

No. 1229

MINERALOGY: Phenocrysts: Microphenocrysts of An38,

aegirine-augite, and Fe-oxide. Groundmass: Feldspar,

glass, magnetite, aegirine-augite.

No. 1230

REMARKS: Potassic rock.

MINERALOGY: Welded tuff(?). Phenocrysts: Sanidine.

Groundmass: Fluidal glass, with sanidine and Fe-oxides.
1229

PORPHYRITIC TRACHYTE

11.54N 4W48E,

0 . HIEKE-J-iERLII.

SIDE GUN.A GRAp.EN, CENTRAL AFAR

SI02

TI02

AL2O3

FE203

FfO

MNO

MQO

CAU

NA20

K20

P205

H20+

H20-

C02

S03

TOTAL

ORI&INAL

ANALYSIS

64.68

1.37

12.62

2.85

3.41

.06

1.43

3.64

5.05

3.34

.37

.90

.20

0.00

0.00

0.00

0.00

0.00

0.00

99.92

I*ATER-CO2-FKEE

(100.0)

65.45

1.39

12.77

2.88

3.45

.06

1.45

3.68

5.11

3.38

.37

SI

Tl

AL

FE3

FE2

MN

Mb

CA

NA

K

P

H»

HC

S

ATOMS

HEIGHT

30.22

.82

6.6B

1.99

2.65

.05

.86

2.60

3.75

2.77

.16

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

23.10

5

1

1

3

1

.37

.31

.77

02

02

76

39

50

52

.11

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMCS =

WEIGHT NORM

(100.0)

15.77

0.00

20.03

43.34

1.86

0.00

0.00

0.00

0.00

11.16

.20

0.00

0.00

4.19

0.00

2.63

0.00

0.00

.82

0.00

.73

NON-OX I DAT I UN NORM

(FE2O3 CONVERTED TO FEO)

12.80

0.00

20.14

43.59

1.87

0.00

0.00

0.00

0.00

12.20

0.00

5.94

0.00

0.00

0.00

2.65

0.00

0.00

.82

0.00

.36

FM

C

ALK

K

MG

TI

28.1

15.3

27.5

.30

.30

4.0

3-COMPONENT

WT.PERCENTS

F 38.93

M 8.89

A 52.18

F 34.23

C 19.90

A 45.87

N 41.98

K 27.76

C 30.2h

1230

SANIDINE TRACHYTE

10.06N 42.40E, S.k.

0. HlbKE-hEKLIN, 1953

L.ASE ST. tLLIS, HARARGE

SI02

TI02

AL203

FE2O3

FEU

MNO

MGJ

CAO

NA20

K20

P2O5

H20+

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

64.96

.68

14.05

6.88

.43

0.00

.36

.36

4.91

5.49

.24

.40

1.08

0.00

0.00

0.00

0.00

0.00

0.00

99.84

*ATER-C02-FREE

(100.01

66.04

.69

14.28

6.99

.44

0.00

.37

.37

4.99

5.58

.24

SI

TI

AL

Ft3

FE2

MN

MG

CA

NA

K

P

H*

Hc

s

ATOMS

*EIGHT

30.35

.41

7.43

4.81

.33

0.00

.22

.26

3.64

4.56

.10

.00

.01

0.00

0.00

ATOMS

NUMBERS (100.0

23.28

5

1

0

3

2

18

93

86

13

00

19

14

41

51

07

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

WEIGHT NORM

(100.0)

14.92

0.00

33.07

42.34

.00

0.00

0.00

0.00

0.00

0.00

0.00

.91

0.00

0.00

7.01

.93

.19

.09

.53

0.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

10.38

0.00

33.52

42.92

.00

0.00

0.00

0.00

0.00

.34

0.00

10.97

0.00

o.oo

0.00

1.33

0.00

0.00

.54

0.00

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

282

35.

26.

1.

35.

2.

38

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

40.45

1.99

57.55

40.45

1.99

45.63

51.02

MGO/MGO*FfO

IN FEMCS =
1231

SANIDINE TRACHYTE

10.08H 42.49E, 5.E. i.ASE KT. ELLIS, HARARsE

0. HltKE-h.EHLlN. 1953

5102

TIU2

AL203

FF203

FEO

MNO

MGCl

CAO

NA20

K2U

P2O5

H2G*

H20-

C02

503

TOTAL

UKI&IfJAL

ANALYSIS

66. RO

.40

15.07

4.64

.14

0.00

.45

.56

4.P.8

b.t9

.09

.56

.44

0.00

0.00

0.00

0.00

0.00

0.00

99.92

«ATEfc-C02-FKEE

(100.0)

67.53

.40

15.23

4.69

.14

0.00

.45

.57

4.93

5.95

.09

SI

TI

AL

FL3

Ffc2

MN

MCj

CA

Hh

K

P

H*

HC

S

0

ATOMS

WEIGHT

31.21

.24

7.97

3.25

.11

0.00

.27

.40

3.62

4.89

.04

.01

.01

0.00

0.00

47.91

ATOMS

NUMBERS (100.0)

23.59

.11

6.27

1.24

.04

0.00

.74

.21

3.34

2.66

.03

62.?8

0

CB

OR

AD

AN

N?

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

WEIGHT NOhM

(100.0)

14.42

0.00

35.28

41.85

1.75

0.00

0.00

0.00

0.00

0.00

0.00

1.14

0.00

0.00

4.70

.30

.26

.10

.20

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

11.41

0.00

35.60

42.23

1.77

0.00

0.00

0.00

0.00

.46

0.00

7.55

0.00

o.oo 0.00

.77

0.00

0.00

.20

0.00

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

299

39.

19.

2.

38.

1.

47

MGO/MG0*FEO

IN FEMC5 =

3-COMPONENT

WT.PERCENTS

F 29.R7

43.07

51.99

4.94

No. 1231

REMARKS: MnO trace; potassic rock.

MINERALOGY: Phenocrysts: K-feldspar (sanidine?).

Groundmass: Trachytic texture, sanidine, plagioclase,

quartz, haematite, limonite.

No. 1232

MINERALOGY: Phenocrysts: Rare sanidine/anorthoclase.

Groundmass: Fluidal glass, quartz, feldspar, aegirineaugite, rare magnetite, limonite, calcite.

OTHER INFORMATION: Derived from the Ayelu volcanic

center (see also 1237).

No. 1233

REMARKS: Originally published by O. Hieke (1941).

Potassic rock.

MINERALOGY: Vitric crystal tuff with lenses and layers

of obsidian schlieren. Phenocrysts: Corroded quartz,

anorthoclase (2V 38 = 40°), brown hornblende. Groundmass: Yellow-brown glass, cossyrite, magnetite,

microlites of arfvedsonite-riebeckite(?).
1232

PORPHYRITIC QUARTZ TRACHyTE (WELDED TUFF)

10.ION 40.39E. 2KK E. OF GAwANI. AFAR

0. HIEKE-MERLIN. 1953

SIU2

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

67.12

.27

14.45

1.08

1.45

.11

.26

2.08

6.29

4.38

.09

1.41

.46

.42

0.00

0.00

0.00

0.00

0.00

99.67

WATER-C02-FREE

(100.0)

68.78

.28

14.81

1.11

1.49

.11

.27

2.13

6.45

4.49

.09

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H+

HC

S

ATOMS

WEIGHT

31.36

7

1

1

4

3

0

.16

65

76

13

09

16

49

67

64

04

02

01

11

oo

ATOMS

NUMBERS (100.0

23.83

.07

6.05

.29

.43

.03

.14

.79

4.33

1.99

.03

0

CH

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

R'J

A"

CC

MG0/MG0*FLO

IN FEMCS =

WEIGHT NORM

(100.0)

11.58

0.00

26.48

50.93

0.00

0.00

0.00

3.10

0.00

6.04

.12

0.00

o.oo .05

o.oo

.52

0.00

o.oo .20

.96

.26

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

12.05

0.00

26.54

51.03

0.00

0.00

0.00

0.00

.82

6.38

0.00

1.47

0.00

0.00

0.00

.52

0.00

0.00

.20

.98

.17

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F 18.80

34.35

16.31

1233

PAHTELLE&ITIC VITRIC TUFF

09.15rt 40.45E, MlESSG (tuARRY P,Y RAILWAY) 1

0. HlEKE-r.ERLINt 1953 (0. HIEV.E, 1941)

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORICINA L

ANALYSIS

68.80

.15

9.64

3.90

2.18

.19

.57

1.28

3.97

5.00

.13

4.00

.38

0.00

0.00

0.00

0.00

0.00

0.00

100.19

k»ATER-C02-F«EE

(100.0)

71.81

.16

10.06

4.07

2.28

.20

.59

1.34

4.14

5.22

.14

SI

TI

AL

FE3

Ft2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

32.14

.09

5.10

2.73

1.69

.15

.34

.91

2.95

4.15

.06

.05

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.23

4

1

2

2

04

17

08

67

06

31

50

82

34

04

Q

C3

OR

A3

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGOtFEO

IN FEMICS =

WEIGHT NOKM

(100.0)

26.42

0.00

30.92

22.64

0.00

0.00

0.00

11.02

0.00

b.00

0.00

3.00

0.00

.40

0.00

.30

0.00

0.00

.30

0.00

.32

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

28.07

0.00

31.17

22.82

0.00

0.00

0.00

0.00

2.93

5.15

0.00

9.26

0.00

0.00

0.00

.30

0.00

0.00

.30

0.00

.16

SI

AL

FM

c

ALK

K

MG

TI

P

C/FM

OZ

345

28

29

6

35

124

-COMPONENT

T.PERCENTS

38.92

37.23

7. 84

54.93

38.73

48.78

12.49
123*

COMENDITE

08.41N 39.O2E. QUARRY AT KM54. ADDIS ABAB*-MOjjO ROAD. SHOA

0. HIEKE-f-'EKLIN, 1953

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H2UC02

503

TOTAL

ORIGINAL

ANALYSIS

70.20

.38

11.12

3.77

.85

.17

.36

.R8

4.71

5.58

.04

.88

1.10

0.00

0.00

0.00

0.00

0.00

0.00

100.04

WATER-C02-FKEE

(100.0)

71.59

.39

11.34

3.84

.87

.17

.37

.90

4.80

5.69

.04

SI

TI

At.

FL3

Ft2

MN

MG

CA

NA

K

P

H+

HC

S

0

ATOMS

WEIGHT

32.80

.23

5.aa

2.64

.66

.13

.22

.63

3.49

4.63

.02

.01

.01

0.00

0.00

48.69

ATOMS

NUMBERS (100.0)

25.01

.10

4.67

1.01

• ?5

.05

.19

.34

3.25

2.54

.01

62.57

0

C8

OR

At)

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H"

1L

TI

Ru

A^>

CC

MGO/MljO»Hr.U

IN FthlCS =

WEIGHT NORM

(100.0)

23.40

0.00

33.72

26.59

0.00

0.00

0.00

11.16

.35

3.54

0.00

.43

0.00

0.00

0.00

.74

0.00

0.00

.09

0.00

.4f

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

25.33

0.00

33.97

26.78

0.00

0.00

0.00

0.00

3.32

3.72

0.00

6.04

0.00

0.00

0.00

.74

0.00

0.00

.09

0.00

.15

353

33

3-COMPONENT

WT.PERCENTS

F 30.26

M 2.36

A 67.39

F 29.26

42.17

49.96

7.88

NO. 1234

REMARKS: Potassic rock.

MINERALOGY: Aphyric. Groundmass: Sanidine, quartz,

plagioclase, aegirine, limonite, cossyrite(?).

No. 1235

REMARKS: Originally published by O. Hieke (1941).

MINERALOGY: Wholly glassy with rare signs of

devitrification.

OTHER INFORMATION: This obsidian occurs in flowbanded vitric trachyrhyolite.

No. 1236

REMARKS: Potassic rock.

MINERALOGY: Porphyritic, with some micropegmatitic

texture. Phenocrysts: Sanidine, barkevikite-riebeckite

more common than aegirine-augite, both rimmed with

aegirine. Groundmass: sanidine, quartz, riebeckite,

aegirine, cossyrite (with aegirine rims), iddingsitised

Fa88 (with aegirine rims), limonite; no glass, no

plagioclase.
1235

COMENLiITIC OhSIOlAN

O9.O3N 38.45N, KIDOTTA RCERETO, tNTOTTO, N. OF ADDIS

0. HIEKE-I.ERLIN, 1953 (0. HIEkE, 1941)

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P205

H2G*

H2C1-

C02

S03

CL

F

TOTAL

ORIGINAL

ANALYSIS

70.88

.53

10.59

1.42

4.41

.11

.36

.48

6.21

4.75

.05

.16

.07

0.00

0.00

.18

.17

0.00

0.00

100.37

V.ATER-C02-FREE

(100.0)

71.03 SI

.53 TI

10.61 AL

1.42 FE.3

4.42 FE2

.11 MN

.36 M&

.48 CA

6.22 NA

4.76 *

.05 F

ATOMS

WEIGHT

33.12

.32

5.60

.99

3.43

.09

.22

.34

4.61

3.94

.02

.00

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

24.88

.14

4.38

.38

1.30

.03

.19

.18

4.23

2.13

.01

0

CB

OR

AR

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

HEIGHT NORM

(100.0)

24.60

0.00

28.21

28.04

0.00

0.00

0.00

..13

..67

.84

).00

'.40

).00

J.00

).00

.01

>.00

j.00

.11

0.00

14

NON-OX 1 DAT I ON NORM

(FE203 CONVERTED TO FEO

25.31

0.00

28.29

28.11

0.00

0.00

0.00

0.00

5.78

1.85

0.00

9.54

0.00

0.00

0.00

1.01

0.00

0.00

.11

0.00

.11

C/FM

OZ

334

29.4

25.4

2.4

42.7

3-COMPONENT

WT.PERCENTS

F 33.99

M 2.10

A 63.91

F 33.76

54.20

41.52

4.20

1236

PANTELLERITIC WELDED TuFh

09.15N 40.45E» MIESSO (SLOPES OF ASSApOT).

0. HltKE-CERLlN. 1953

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

S03

TOTAL

ORIGINAl

ANALYSIS

72.12

.20

8.96

3.95

2.42

.11

.46

1.26

4.13

5.24

.13

.72

.48

0.00

0.00

0.00

0.00

0.00

0.00

100.18

WATER-C02-FHEE

(100.0)

72.86

.20

9.05

3.99

2.44

.11

.46

1.27

4.17

5.29

.13

SI

TI

AL

FE3

FE2

MN

Mi

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

33.69

.12

4.74

2.76

1.88

.09

.28

.90

3.06

4.35

.06

.01

.01

0.00

0.00

ATOMS

NUMBERS (100.0

25.61

3

1

2

2

05

75

06

72

03

24

48

84

38

04

0

CR

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

VT

HI

IL

TI

RU

AP

CC

IN FEMC S =

HEIGHT NORM

(100.0)

30.28

ci.oo

31.37

17.03

0.00

0.00

0.00

11.58

1.22

4.79

0.00

3.06

0.00

0.00

0.00

.38

0.00

0.00

• ?9

0.00

.Zt

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

32.33

0.00

31.61

17.16

0.00

0.00

0.00

0.00

4.31

4.91

0.00

9.00

0.00

0.00

0.00

.39

0.00

0.00

.29

0.00

.13

c

ALK

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 39.32

38.85

49.29

11.85
1237

CCWENulTIC ObSlDlAN (IN ElDED TUFF)

10.05N 40.39E , „ . FOOT OF MT. A.jELU,

0 . HIEKE-MERLIN, 1953 (O. HIEKE, 1941)

SI02

TIU2

AL2O3

FE2O3

FEU

MNO

MGO

CAU

NA2O

K2O

P2O5

H2O*

H2OC02

503

CL.

F

TOTAL

ORIGINAL

ANALYSIS

72.82

.30

10.30

.44

2.99

.03

.22

1.48

b.69

4.67

0.00

.10

.04

0.00

0.00

.30

.11

0.00

0.00

100.49

WATER-C02-FREE

72.86

.30

10.31

.44

2.99

.03

.22

1.48

6.69

4.67

0.00

(100.0)

SI

TI

AL

Ft3

FE2

MM

Mo

CA

NA

K

P

H*

HC

s

0

ATOMS

HEIGHT

34.02

• IB

5.45

.31

2.32

.02

.13

1.06

4.96

3.88

0.00

.00

.00

0.00

0.00

47.74

ATOMS

NUWHtWS (100.0)

25.30

.08

4.22

.12

.87

.01

.11

.55

4.51

2.07

0.00

62.17

0

CB

OR

AR

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

ccMGO/MGO+FEO

IN FEMICS =

WtlGHT NORM

(100.0)

28.21

0.00

27.69

26.95

0.00

0.00

0.00

1.28

6.61

6.47

0.00

2.23

0.00

0.00

0.00

.57

0.00

0.00

0.00

0.00

.12

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

28.43

0.00

27.72

26.97

0.00

0.00

0.00

0.00

6.95

6.48

0.00

2.88

0.00

0.00

0.00

.57

0.00

0.00

o.oo 0.00

.11

NIGGLl

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

358

29.h

15.7

7.8

46.6

.31

.10

1.1

0.00

.50

121

3-COMPONENT

WT.PERCENTS

F 22.85

M 1.47

A 75.6ft

F 71.OS

52.10

36.37

11.53

NO. 1237

MINERALOGY: Groundmass: Glass with abundant

crystallites of anorthoclase; magnetite, uncommon

aegirine-augite; no quartz(?).

No. 1238

MINERALOGY: Spherulitic texture. Phenocrysts:

Strongly resorbed K-feldspar phenocrysts, composed of

anorthoclase (2V=50°) accreted on orthoclase (2V=6l°).

Groundmass: Spherulites composed of orthoclase(?) and

chalcedony; haematite, magnetite, zircon; zeolites in

cavities.

No. 1239

REMARKS: Originally published by O. Hieke (1941).

MINERALOGY: Groundmass: Fluidal glass; crystallites

of feldspar, apatite, zircon, green pyroxene.

OTHER INFORMATION: This rock forms characteristic

cupolas, presumably formed by trapped gases.
1238

COMENuITE

10.41N 39.52E.

0. HIEKE-MERLIN,

MOFA, 45KM 5. OF KOMBOLCHA (ON ROAD)

1953

SI02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

73.08

.45

11.61

2.48

.72

.09

.88

1.64

3.80

t.04

.15

.82

.41

0.00

0.00

0.00

0.00

0.00

0.00

100.17

WATER-C02-FREE

(100.0)

73.86

.45

11.73

2.51

.73

.09

.89

1.66

3.84

4.08

.15

SI

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

34.14

.27

6.14

1.73

.56

.07

.53

1.17

2.82

3.35

.07

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0

25.54

4

2

1

12

78

65

21

03

46

61

58

80

04

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

hW

IL

TI

RU

AP

CC

MGO/MGO-i-FtlO

IN FtPICS =

WEIGHT NORM

<100.0)

32.25

0.00

24.20

32.58

2*66

0.00

0.00

0.00

0.00

3.66

0.00

.53

0.00

1.33

1.60

.66

0.00

0.00

.33

0.00

1.00

NON-OXIDATIUN NORM

<FE2O3 CONVERTED TO FEO)

30.35

0.00

24.32

32.74

2.67

0.00

0.00

0.00

0.00

4.00

0.00

4.72

0.00

0.00

0.00

.67

0.00

0.00

.33

0.00

.39

SI

AL

FM

C

ALK

MG

Tl

P

C/FM

389

36.

20.

9.

33.

1.

3-COMPONENT

WT.PERCENTS

F 26.85

25.24

12.93

61.83

40.08

42.62

17.30

1239

CONItNi/ITIC ObSIOlAN

11.53N 41.08E, 23H1 „ . FROV; SARDO, CENTRAL AFAK

0 . HlEKE-h.ERLl N 195 3 (O . HIEr.E , 1941 )

SIU2

TI02

AL203

FE203

FEO

MNU

MGO

CAO

NA2O

K2O

P205

H20*

H2UC02

S03

CL.

F

TOTAL

ANALYSIS

73.80

.22

12.10

.82

1.56

.01

.22

.84

5.10

4.95

.08

.22

.09

0.00

0.00

.19

.06

0,00

0.00

100.26

WATER-C02-FREE

74.02

.22

12.14

.82

1.56

.01

.22

.84

5.12

4.96

.08

(100.0)

SI

TI

AL

FL3

FE2

MN

MG

CA

NA

K

P

H+

HC

S

ATOMS

WEIGHT

34.48

.13

6.40

.57

1.21

.01

.13

.60

3.78

4.11

.03

.00

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.54

.06

4.94

.21

.45

.00

.11

.31

3.42

2.19

.02

0

CB

OR

AI3

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+hEO

IN FtMC S =

WEIGHT NOPM

(100.0)

26.83

0.00

29.43

34.74

0.00

0.00

0.00

2.39

1.38

3.22

0.00

1.42

0.00

0.00

0.00

.42

0.00

0.00

.18

0.00

.22

NON-OX I DAT I UN NORM

(FE2O3 CONVERTED TO FEO)

27.24

0.00

29.47

34.80

0.00

0.00

0.00

0.00

2.02

3.25

0.00

2.62

0.00

0.00

0.00

.42

0.00

0.00

.18

0.00

.16

3-COMPONENT

WT.PERCENTS

F 18.81

M 1.74

A 79.45

F 17.94

46.83

45.45
C E u

1O.33N 42.39E.

0. HItKE-MERLIN,

MIL MlLLACAT.

1953

ARAwEINA, HARARQ E

SI 02

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K2O

P2O5

H2O*

H2OCO2

SOJ

TOTAL

OKICJINAL

ANALYSIS

74.12

0.00

11.96

1.29

.36

0.00

.52

1.24

2.42

5.71

0.00

1.46

1.04

0.00

0.00

0.00

0.00

0.00

0.00

100.12

V.ATER-C02-FHEE

(100.0)

75.93

0.00

12.25

1.32

.37

0.00

.53

1.27

2.48

5.85

0.00

SI

TI

AL

Ft3

FE2

MM

Ma

CA

NA

K

P

H»

Hc

s

0

ATOMS

WEIGHT

34.63

0.00

6.33

.90

.28

0.00

.31

.89

1.80

4.74

0.00

.02

.01

0.00

0.00

50.22

ATOMS

NUMBERS (100.0)

26.18

0.00

4.98

.34

.11

0.00

.27

.47

1.66

2.58

0.00

63.41

0

CB

OR

AB

AN

NF

LC

AC

NS

DI .

WO

HY

OL

MT

H'-1

IL

Tl

Rll

AP

ccKGO/MGO+t-tO

IN FthlCS -

rttl&HT NORM

(100.0)

35.74

0.00

34.67

21.03

4.97

0.00

0.00

0.00

0.00

1.05

0.00

.84

0.00

1.19

.50

0.00

0.00

0.00

0.00

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

34.62

0.00

34.76

21.09

4.98

0.00

0.00

0.00

0.00

1.15

0.00

3.41

0.00

0.00

o.oo 0.00

0.00

0.00

0.00

0.00

.40

NlGGLl

SI

AL

FM

C

ALK

<

M6

TI

P

C/FM

QZ

451

42.<

12.

8.

36.

.

0.

,]

.8

0.00

.65

204

3-COMPONENT

WT.PERCENTS

F 16.07

M 5.05

A 78.93

F 14.97

C 11.25

A 73.77

N 75.83

K 60.94

C 13.23

No. 1240

REMARKS: TiO2, MnO,

 p

2 ° 5 '

 CO2 traces ; strongly

potassic rock.

MINERALOGY: Microspherulitic texture. Groundmass:

Spherules of orthoclase (sanidine?) and chalcedony;

quartzo-feldspathic mosaic between spherules; some

haematite, limonite, calcite.

No. 1241

MINERALOGY: Phenocrysts: Anhedral quartz, euhedral

sanidine. Groundmass: Quartz, sanidine titaniferous

sodic hornblende, magnetite, limonite, apatite, glass.

No. 1242

REMARKS: P2O5 trace.

MINERALOGY: Phenocrysts: Corroded quartz, sanidine

(2V=41°). Groundmass: Quartz, sanidine, albite,

aegirine-augite, barkevikite.
1241

P0RPHYRIT1C CONiE

11.2OiM 39.41E,

0 . HIEKE-MEKLIN,

LAKE HAYK. WALLO

SIU2

TI02

AL2O3

FE203

FED

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

77.72

.48

10.19

1.42

1.03

.04

.22

.14

3.59

4.58

.03

.54

.28

0.00

0.00

0.00

0.00

0.00

0.00

100.26

f^ATER—1

78.16

.48

10.25

1.43

1.04

.04

.22

.14

3.61

4.61

.03

C02-FREE

(100.0)

SI

TI

AL

FE3

FE2

MN

Mb

CA

NA

K

P

H+

HC

S

ATOMS

HEIGHT

36.31

.29

5.39

.99

.80

.03

.13

.10

2.66

3.80

.01

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

26.67

.12

4.15

.37

.30

.01

.11

.05

2.41

2.02

.01

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

cc

MGO/MGO+fEO

1.-4 FEK.ICS =

WEIGHT NORM

(1OO.0)

39.35

0.00

27.30

27.03

0.00

0.00

0.00

3.1R

0.00

.44

o.oo

1.24

0.00

.48

O.OO

.92

0.00

0.00

.07

0.00

.44

NON-OXIDATION NORM

(FE2O3 CONVEKTED TO FEO)

39.60

0.00

27.38

27.10

0.00

0.00

0.00

0.00

.84

.46

0.00

3.64

0.00

0.00

0.00

.92

0.00

0.00

.07

0.00

.18

C/FM

02

3-COMPONENT

WT.PERCENTS

F 22.60

M 2.03

A 75.37

F 22.77

C 1.30

A 75.93

N 43.70

K 55.11

1242

PORPHYRtTIC COMEMDlTE (HITHI N TRAP SERIES) uSHEET«

11.31N 39.36E. UTCHALI, ViALLO

0. HIEKE-hERLIN, 1953

SI02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P205

H2U*

H20-

C02

503

TOTAL

OKIGINAi.

ANALYSIS

79.OS

.48

8.72

1.57

1.18

.06

.18

• 30

3.40

4.09

0.00

.53

.25

0.00

0.00

0.00

0.00

o.oo

0.00

99.P4

ATER-C02-F*EE

(100.0)

9.83

.48

8.80

1.58

1.19

.06

.18

.30

3.43

4.13

0.00

SI

TI

AL

FE3

Ft2

MN

Mb

CA

NA

K

P

H+

HC

S

ATOMS

WEIGHT

36.95

.29

4.61

1.10

.92

.05

.11

.21

2.52

3.40

0.00

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

27.44

3

2

1

0

.13

57

41

34

02

09

11

29

81

00

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

H'4

IL

TI

RU

AP

CC

MGG/MGOtFEO

IN FtMICS =

HEIGHT NORM

(100.0)

44.78

0.00

24.47

22.25

0.00

0.00

0.00

4.60

.38

1.30

0.00

1.29

0.00

0.00

0.00

.92

0.00

0.00

0.00

0.00

.2e

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

45.64

0.00

24.55

22.32

0.00

0.00

0.00

0.00

1.60

1.33

0.00

3.64

0.00

0.00

0.00

.92

0.00

0.00

0.00

0.00

.13

569

37.0

18.0

2.3

42.7

.44

3-COMPONENT

WT.PERCENTS

F 26.391

43.65

52.50

3.85
1243

ANKARAMITIC UASALT

15.21N 44.10E, J . ASStR, SANA, YE«l£N

N.M. SHUKRI AND E.Z. BA5TA, 1955

SI 02

TI02

AL2O3

FE203

FEU

MNO

MGO

CAO

NA20

K2U

P2O5

H 20 +

H2UC02

S03

TOTAL

OR It, INA[.

ANALYSIS

39.72

3.00

13.03

.72

13.64

.03

11.32

14.04

1.35

.17

.20

2.R8

0.00

.14

0.00

0.00

0.00

0.00

0.00

100.44

WATER-C02-FREE

(100.0)

40.77

3.08

13.38

.74

14.21

.03

11.62

14.41

1.39

.17

.21

SI

TI

AL

FE3

FE2

MN

MG

CA

N*

K

P

H+

HC

s

0

ATOMS

WEIGHT

18.56

1.80

6.89

.50

10.76

.02

6.83

10.03

1.00

.14

.09

.03

0.00

.04

0.00

43.74

ATOMS

NUMBERS 1100.0)

15.41

5

4

6

5

1

88

96

21

50

01

56

84

02

08

07

59. 48

SI02 LEFIC1T

0

CB

OH

AH

AN

NE

LC

AC

NS

DI

WO

HY

OL

I*T

HM

IL

TI

RU

AP

CC

MGO/MGO+FEU

IN FE.MCS =

-1.46

fctlGHT NOFiM

(100.0)

0.00

0.00

0.00

0.00

29.69

6.35

• ei

0.00

0.00

32.50

0.00

0.00

24.47

1.07

0.00

5.83

0.00

0.00

.45

.33

.6?

-1.84

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

0.00

0.00

29.73

6.36

.81

0.00

0.00

32.62

0.00

0.00

25.74

0.00

0.00

5.84

0.00

0.00

.45

.33

.63

N1GGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

74

14.

54.

28.

2.

4.

-36

3-COMPONENT

WT.PERCENTS

F 53.14

M 41.31

A 5.55

8.6R

1.09

90.23

No. 1243

REMARKS: No separate determination of H2O-.

MINERALOGY: Phenocrysts: Diopside-augite and

titanaugite, fresh olivine Fa 11, with bowlingite rims.

Groundmass: Augite, olivine, labradorite microlites,

magnetite.

OTHER INFORMATION: Mode: 23% labradorite, 49.5%

augite, 1 3. 5% olivine, 14% magnetite.

No. 1244

MINERALOGY: Phenocrysts: Large diopside (or

diopside-augite) and younger zoned titanaugite, olivine.

Groundmass: Augite, olivine, magnetite, labradorite

microlites.

OTHER INFORMATION: Mode: 14% labradorite, 62%

pyroxene, 7. 5% magnetite, 16.5% serpentine (mostly

after olivine).

No. 1245

REMARKS: CO2 trace.

MINERALOGY: Groundmass: Pyroxene more abundant

than olivine, magnetite, labradorite with intersertial

glass.

OTHER INFORMATION: Mode: 31% labradorite, 28%

pyroxene, 6% glass, 15. 5% olivine, 19. 5% magnetite.
1244

ANKARAMITL

15.03N 43.56E, MAFHAQ, YEMEN

N.M. SHUKkl AND E.Z. BASTA, 1955

SI02

TI02

AL2O3

FE203

FEU

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OCO^

SO3

TOTAL

ORIGINAL

ANALYSIS

42.62

2.54

11.31

8.25

5.03

.27

8.24

14.87

1.25

.89

.33

2.96

.99

.51

0.00

0.00

0.00

0.00

0.00

100.06

WATER-C02-FHEE

(100.0)

44.58

2.66

11.83

8.63

5.26

.28

8.62

15.55

1.31

.93

SI

TI

AL

Ft3

FE2

MM

Mo

CA

NA

<

ATOMS

WEIGHT

19

1

5

5

3

4

10

91

52

98

77

91

21

97

63

93

74

ATOMS

NUMBERS (100.0)

16.7

.7

5.2'

2.4

1.6

• 0

4.8'

6.2-

.9

.4

t

r

0

Cfl

OR

A8

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

IL

TI

RiJ

A^

CC

MGO/MGOtf-L.0

IN FEMICS =

WEIGHT NORM

(100.0)

0.00

0.00

5.48

11.02

23.51

0.00

0.00

0.00

0.00

37.37

0.00

3.48

.41

10.16

1.59

5.01

0.00

0.00

.75

1.21

1.00

NON-OXIDATION NORM

(KE203 CONVERTED TO FEO)

0.00

0.00

5.57

4.13

23.90

3.83

0.00

0.00

0.00

40.19

0.00

0.00

15.28

0.00

0.00

5.10

0.00

0,00

.76

1.23

.60

c

AUK

C/FM

QZ

3-COMPONEN T

WT.PERCENTS

F 56.1*

H 34.A3

A 9.04

43.84

49.09

7.07

5.23

B7.42

15.34N 44.05E.

N.M. SHUKkl AND

HAl.A, YE.-XN

.2. BAbTA, 19

SI02

TI02

AL2O3

FE2O3

FEO

MNU

MGO

CAO

NA20

K2O

P2O5

H2O*

H2OCO2

SO3

S

CL

TOTAL

ANALYSIS

44

1

14

2

9

5

10

2

1

1

6

0

0

0

0

100

04

30

91

26

36

18

79

41

63

16

15

80

60

00

00

055

075"

00

00

72

nATER-C02-FREE

(100.0)

47.26

1.39

16.00

2.43

10.04

.19

6.21

11.17

2.82

1.24

1.23

SI

TI

AL

Ffc3

FE2

MN

Mb

CA

NA

K

P

ATOMS

WEIGHT

20.5a

.78

7.89

1.5H

7.28

.14

3.49

7.44

1.95

.96

.50

ATOMS

NUMBERS (100.0)

17.46

.39

6.97

.68

3.11

.06

3.43

4.42

2.02

.59

.39

0.00

0.00

0

Cfi

09

AR

AN

NE

LC

AC

NS

or

wo

HY

OL

MT

H*t

IL

TI

PI)

AP

CC

MG0/MGO*FI£O

Ili FEMICS =

HEIGHT NORM.

(100.0)

0.00

0.00

7.37

22.71

27.27

.66

0.00

0.00

0.00

I/.33

0.00

0.00

15.79

3.52

0.00

2.65

0.00

O.CO

2.70

0.00

.58

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

7.41

20.01

27.40

2.18

0.00

0.00

0.00

17.61

0.00

0.00

20.03

0.00

0.00

2.66

0.00

0.00

2.71

0.00

• 50

SI

AL

FM

C

ALK

K

MG

Ti

p

C/FM

QZ

106

21.1

44.1

26.9

7.9

.11

.47

2.3

1.17

.61

-26

3-COMPONENT

WT.PERCENTS

F 54.81

M 27.31

A 17.88

F 45.00

C 40.32

A 14.68
1246

OLIVINE bASALT

13.35N 44.OOE, TA

N.M. SHUKkl Aub L.I.

-Iz, YEMEN

UASTA, 1955

ST02

TI02

AL203

FE2O3

FEO

MNO

MSO

CAO

NA20

K2O

P2U5

H2U*

H2OC02

S03

TOTAL

0

CB

OR

AH

AN

NF

LC

AC

NS

DI

WO

HY

OL

MT

HV

IL

TI

An

CC

ORIGINAL

ANALYSIS

45.06

5.20

lfa.70

4.98

7.74

.10

3.25

6.90

3.71

.52

.32

2.33

0.00

1.33

0.00

0.00

0.00

0.00

0.00

100.14

WEIGHT fiORM

(100.0)

2.57

0.00

3.15

32.lh

27.95

0.00

0.00

0.00

0.00

5.35

0.00

7.51

0.00

7.40

0.00

10.09

0.00

0.00

.72

3.10

*ATER-C02-FRtE

(100.0)

46.70

5.39

17.31

5.16

8.02

.10

3.37

9.22

3.85

.54

.33

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

3.IB

32.47

28.23

0.00

0.00

0.00

0.00

5.73

0.00

8.07

8.28

0.00

0.00

10.19

0.00

0.00

.72

3.13

SI

TI

AL

Ft3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

21.05

3.12

8.84

3.48

6.02

.08

1.96

6.36

2.75

.43

.14

.03

0.00

.36

0.00

45.52

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/Frt

OZ

ATOMS

NUMBERS

17.31

1.50

7.56

1.44

2.49

.03

1.86

3.66

2.76

.26

.10

61.01

117

25.6

39.4

24.8

10.2

.OH

.3?

10.2

.35

.63

-24

(100.0)

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

D.I.

62.97

16.09

70.94

49.21

34.43

16.36

28.2h

3.96

67.7R

79.65

In FEMCS =

No. 1246

REMARKS: No separate determination of H^O-.

MINERALOGY: Phenocrysts: Labradorite, titanaugite,

olivine Fal8. Groundmass: Same minerals as phenocrysts, plus Fe-oxides.

OTHER INFORMATION: Mode: 62. 2% labradorite,

13. 5% pyroxene, 8. 1% olivine, 5.4% serpentine and

chlorite, 10.8% magnetite and ilmenite.

No. 1247

REMARKS: No separate determination of H^O-.

MINERALOGY: Phenocrysts: An58, and titanaugite

together make up about 30% of rock. Groundmass: An50

microlites, titanaugite, magnetite, rare glass, chlorite,

calcite, epidote.

OTHER INFORMATION: Mode: 50% labradorite, 12%

augite, 22% magnetite (and ilmenite), 8% chlorite,

8% calcite and epidote.

No. 1248

REMARKS: CO2 trace.

MINERALOGY: Groundmass: Vesicular black glass, with

minute magnetite(?), few laths labradorite, some

olivines, rare titanaugite.

OTHER INFORMATION: Mode: 11.8% labradorite, 17.6%

olivine, 70. 6% glass and iron-ores.
1247

LAbRAuORlTE-TITANAuGlTC '.ASAiT

13.55N 43.32E. HA-17. YEMEN

N.M. SHUKhl AND F.Z. DAbTA, 1955

SIU2

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

503

TOTAL

ORIGINAL

ANALYSIS

45.10

5.20

12.79

4.53

B.17

.06

6.01

10.90

2.78

.84

.13

3.20

0.00

.54

0.00

0.00

0.00

o.oo

0.00

100.25

WATER-CO2-FREE

(100.0)

46.73

5.39

13.25

4.69

8.47

.06

6.23

11.29

2.88

.87

.13

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

21.07

3.12

6.77

3.17

6.35

.05

3.63

7.79

2.06

.70

.06

.04

0.00

.15

0.00

ATUMS

NUMBERS (100.0)

17.44

1.51

5.83

1.32

2.65

.02

3.47

4.52

2.09

.41

.04

0

CF)

OR

AS

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

IL

TI

RU

AP

ccM60/MG0»FE0

IN FtMICS =

WEIGHT NORM

(100.0)

.27

0.00

5.13

24.28

20.51

0.00

0.00

0.00

0.00

24.58

0.00

6.72

0.00

6.78

0.00

10.17

0.00

0.00

.29

1.27

.88

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

5.17

23.93

20.69

.31

0.00

0.00

0.00

25.79

0.00

0.00

12.27

0.00

0.00

10.26

0.00

0.00

.30

1.28

.60

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 56.87

M 26.91

A 16.21

F 46.66

C 40.04

A 13.30

I24B

HYALObASALT FWB

15.30N 44.00E, KAULET EL ERG . SANA,

M.M. oHUKRI AND E,Z> RASTA, 1955

SIu2

TI02

AL203

FE2O3

FEO

MNO

MGU

CAO

NA20

K20

P205

H2u*

H2CIC02

S03

5

CL

TOTAL

ORIGINAL

AUALYSIS

46.C8

1.00

17.38

4.P2

6.18

.16

7.2B

9.30

1.99

.58

.64

4.33

.77

0.00

0.00

.017

.01s

0.00

0.00

100.54s

WATER-C02-FREE

(100.0)

48.30

1.05

18.22

5.05

6.48

.17

7.63

9.75

2.09

.61

.67

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

Ht

HC

s

ATOMS

WEIGHT

21.53

.60

9.20

3.37

4.80

.12

4.39

6.65

1.48

.48

.28

.05

.01

0.00

0.00

ATOMS

NUMBERS (100.0

17.58

7

1

1

4

3

1

.29

.82

39

98

05

15

80

47

?8

21

0

Cf)

OR

AB

AN

NE

LC

AC

NS

DI

wo

HY

OL

MT

H«

IL

TI

RU

AP

CC

M("-iU/MG0»FEO

IN FtMC S =

HEIGHT NORM

(100.0)

1.54

0.00

3.60

17.68

38.52

0.00

0.00

O.OO

0.00

4.80

0.00

23.06

0.00

7.34

0.00

1.99

0.00

0.00

1.47

0.00

.80

NON-OXIDATION NOf>M

(FE203 CONVERTED TO FEO)

0.00

0.00

3.64

17.86

38.90

0.00

0.00

0.00

0.00

4.99

0.00

20.47

10.65

0.00

0.00

2.01

0.00

0.00

1.48

0.00

• 5B

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

52.76

34.92

12.33

48.10

40.66

11.24
1249

OLIVIN E BASALT (RECENT)

15.3OM 44.05E» J. EL-l)AMAA-HA'iCiAN. YEMEN

N.M. SHUKRI AMD E.Z. BASTA, 1955

SIO2

TIU2

AL2O3

FE2O3

FEO

MNU

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2UCO2

SO3

TOTAL

ORIGINAL

ANALYSIS

46.12

1.19

16.92

2.14

8.33

.19

9.30

11.41

2.40

.31

.16

.97

.?6

.25

0.00

0.00

0.00

0.00

0.00

99.95

\,,ATEK-C02-FREE

46.84

1.21

17.18

2.17

8.46

.19

9.44

11.59

2.44

.31

.16

(100.0)

51

TI

AL

FE3

Ft2

MN

M6

CA

NA

tc

P

H*

Hc

s

0

ATOMS

WEIGHT

21.55

.71

8.95

1.50

6.47

.15

5.61

6.15

1.78

.26

.07

.01

.00

.07

0.00

44.66

ATOMS

NUMBERS (100.0)

17.10

.33

7.40

.60

2.59

.06

5.15

4.54

1.73

.15

.05

60.31

0

CB

OK

AB

AN

NE

LC

AC

NS

01

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

IN FEMC S =

*ElGHT MCkM

(100.0)

0.00

0.00

1.66

20.48

34.90

.07

0.00

0.00

0.00

lfc.21

0.00

0.00

20.12

3.15

0.00

2.29

0.00

0.00

• 35

.58

.72

NON-OX I DAT I ON NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

1.87

18.05

35.04

1.43

0.00

0.00

0.00

16.45

0.00

0.00

23.93

0.00

0.00

2.30

0.00

0.00

.36

.58

.64

NlGGLl

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

97

21.

4 7.

25.

5.

1.'

-24

3-COMPONENT

WT.PERCENTS

F 46.57

M 41.37

A 12.06

F 42.5ft

C 46.40

A 11.07

N 17.00

K 2.20

C 80.81

No. 1249

MINERALOGY: Phenocrysts: Olivine (slightly iddingsitised). Groundmass: Labradorite laths, titanaugite,

magnetite; no glass.

OTHER INFORMATION: Mode: 44. 2% labradorite, 26.4%

olivine, 23. 5% pyroxene, 5. 8% magnetite.

No. 1250

REMARKS: CO- trace; published summation is 100.913.

MINERALOGY: Groundmass: Predominant glass, with

labradorite, pyroxene, magnetite.

No. 1251

REMARKS: No separate determination of H2O-.

MINERALOGY: Phenocrysts: Large labradorite (forms

62% of whole rock). Groundmass: Andesine-labradorite,

magnetite, chlorite, calcite, vesicles with epidote.
1250

OLlVlNE BASALT (RECENT)

15.45N 44.00E, bETwEEN NA-IT AND AMRAN,

N.M. SHJKRI AND E.Z. BASTA, 1955

SI02

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

S03

S

CL

TOTAL

ANALYSIS

46.72

.90

19.00

12.25

.64

.19

5.36

9.90

2.98

.87

.13

1.39

.56

0.00

0.00

.055-

.018

0.00

0.00

100.963

WATER-C02-FREE

(100.0)

47.22

.91

19.20

12.38

.65

.19

5.42

10.01

3.01

.88

.13

SI

TI

AL

Ft3

FE2

MM

Mb

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

21.83

.54

10.05

8.57

.50

.15

3.23

7.08

2.21

.72

.06

.02

.01

0.00

0.00

AT0M5

NUMBERS (100.0)

17.25

.25

8.27

3.41

.20

.06

2.96

3.92

2.14

.41

.04

Q

CR

OR

An

AN

NE

LC

AC

NS

DI

VvO

HY

OL

MT

HM

IL

TI

RU

HO

cc

MGO/MGOtFEO

IN FtKICi =

WEIGHT NORM

(100.0)

0.00

0.00

5.21

25.53

36.?4

0.00

0.00

0.00

0.00

9.91

0.00

a.05

.61

.08

12.35

1.73

0.00

0.00

.29

0.00

1.00

NON-OX IDAT ION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

5.33

22.12

37.12

2.18

0.00

0.00

0.00

10.90

0.00

0.00

2 0. 28

0.00

0.00

1.77

0.00

o.oo

.29

0.00

.49

SI

AL

FM

C

ALK

108

25.9

41.5

24.6

8.0

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

58.33

24.25

17.4?

46.39

37.1ft

14.45

1251

P0RPHYRIT1C TRACHYLJASALT

13.35N 44.00E. TA-I7. YErttK

N.M. SHUKRI AND E.2. BASTA, 1955

5102

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K2D

P205

H20 +

H20-

C02

S03

TOTAL

OKICINA L

ANALYSIS

48.72

2.60

19.49

7.22

3.59

0.00

1.20

7.46

4.B5

2.64

.25

l.f.9

0.00

.42

0.00

0.00

0.00

0.00

0.00

100.13

ATER-C02-FKEE

(100.0)

9.70

2.65

9.88

7.37

3.66

0.00

1.22

7.61

4.95

2.69

.26

SI

TI

AL

FE.3

Ft2

MN

M6

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

22.76

1.56

10.31

5.05

2.79

0.00

.72

5.33

3.60

2.19

.11

.02

0.00

.11

o.oo

ATOMS

NUMRERS (100.0)

18.13

.73

8.55

2.03

1.12

0.00

.67

2.98

3.50

1.25

.08

0

CB

OR

AR

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO•

IN FEMICS =

WEIGHT NORM

(100.0)

0.00

0.00

15.68

33.50

23.93

4.48

0.00

0.00

0.00

6.57

.47

0.00

0.00

4.13

4.50

5.01

0.00

0.00

.56

.97

1.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

16.11

27.02

24.26

8.32

0.00

0.00

0.00

8.39

0.00

0.00

9.27

0.00

0.00

5.08

0.00

0.00

.56

.99

.23

c

ALK

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F 55.44

41.96

28.96

2 9. Oft

32.44

17.66

49.90
1252

P0RPHVRIT1C TRACrHYbASALT < AMYGDALOIDAL )

13.35N 44.00E, TA-IZ. YEMEN

N.M. 3HUKKI AND L.2. PASTA, 1955

SIU2

TIO2

AL2O3

FE2O3

FED

MMO

MGQ

CAO

NA2O

K2U

P2O5

H2O*

H2OCO2

SO3

TOTAL

ORIGINAL

ANALYSIS

49.44

2.48

17.10

7.40

3.41

• 15

3.24

7.69

3.22

2.31

.65

2.35

.52

0.00

0.00

0.00

0.00

0.00

0.00

99.96

*ATER-C02-FkEE

50.92

2.55

17.61

7.62

3.51

.15

3.34

7.92

3.32

2.38

.67

(100.0)

SI

TI

AL

F£3

FE2

MN

MCj

CA

NA

K

P

H.

HC

s

0

ATOMS

WEI&HT

23.10

1.49

9.05

5.18

2.65

.12

1.95

5.50

2.39

1.92

.2a

.03

.01

0.00

0.00

46.31

ATOhS

NUMBERS (100.0)

18.57

.70

7.57

2.10

1.07

.05

1.82

3.10

2.35

1.11

.21

61.37

0

C8

OH

AD

AN

NE

LC

AC

N5

DI

HO

HY

DL

*1T

IL

TI

3:j

UP

:c

fttl&HT NORM

(1OO.O)

4.13

0.00

14.09

2b.12

26.10

0.00

0.00

0.00

0.00

7.27

0.00

4.06

0.00

4.45

4.57

4.H5

0.00

0.00

1.4e

0,00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

14.30

28.54

26.46

0.00

0.00

0.00

0.00

7.98

0.00

9.76

6.54

0.00

0.00

4.92

0.00

0.00

1.49

0.00

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

136

27.7

36.9

22.7

12.7

.3

.3

5.1

.7

.6

-15

In FfcKICS = 1.00

3-COMPONENT

WT.PERCENTS

F 55.21

M 16.55

A 28.24

F 44.99

C 32.00

A 23.01

N 24.36

K 17.47

C 58.17

No. 1252

MINERALOGY: Phenocrysts: Large labradorite, rare

green hornblende. Groundmass: Andesine-labradorite,

magnetite; amygdales with chlorite, epidote, calcite,

orthoclase, quartz.

No. 1253

REMARKS: CO2 trace.

MINERALOGY: Aphyric texture. Groundmass:

Andesine-oligoclase laths, olivine Fa42, scarce diopsideaugite, magnetite, orthoclase(?) microlites.

OTHER INFORMATION: Mode: ca. 50% plagioclase,

ca. 20% olivine.

No. 1254

REMARKS: No separate determination of H2O-; this

rock would have been termed "grorudite" by some

Ethiopian authors.

MINERALOGY: Phenocrysts: Anorthoclase, scarce

albite. Groundmass: Trachytic texture; anorthoclase,

quartz, magnetite and haematite (after riebeckite).

OTHER INFORMATION: Mode: 64. 5% anorthoclase and

albite, 8. 5% quartz, 27% iron oxides.
1253

OLlVlNE TRACMYEASALT MUCFARITIC )

15.30N 44.05E, HAfDAN, YE>-tN

N.M. SHUKRI AND E.Z. BASTA. 1955

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O+

H2OCO2

S03

S

CL

TOTAL

JINAL

ANALYSIS

54.52

.i

16.-

b.t

5.

1.'

5.C

4.<

2.

."

1 »<

.<

10

4

7

>4

4

.5

)0

3

2

n

a>4

0.00

0.00

.028

0.007

0.00

0.00

100.46?

*ATER-C02-FKEE

(100.0)

55.59

.92

17.07

5.98

5.75

.24

1.48

5.10

4.72

2.37

.79

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H+

HC

s

ATOMS

WEIGHT

25.47

.54

8.86

4.11

4.38

.19

.87

3.57

3.43

1.93

.34

.02

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

20.10

.25

7.27

1.63

1.74

.08

.80

1.98

3.31

1.09

.24

0

enOR

AH

AM

NE

LC

AC

NS

DI

wo

HY

OL

MT

II

TI

RU

AP

cc

MG0/MGG*FEO

IN FEMCS =

WEIGHT NORM

(100.0)

6.21

0.00

14.01

40.03

18.34

0.00

0.00

0.00

0.00

1.99

0.00

7.?6

0.00

8.70

0.00

1.74

0.00

0.00

1.72

U.00

.51

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

14.17

40.49

18.55

0.00

0.00

0.00

0.00

2.10

0.00

20.82

.36

0.00

0.00

1.76

0.00

0.00

1.74

0.00

.21

SI

AL

FM

C

ALK

166

30

35

16

18

3-COMPONENT

WT.PERCENTS

F 57.81

49.06

21.31

29.62

38.74

19.41

41.84

1254

QUARTZ SODA-TRACHYTE DGKORUD ITE"

14.33N 44.02E, N. OF j. SAbER.

N.M. SHUKkl AND E.Z. RASTA, 1955

TA-IZ, YEMEN

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P205

H2U*

H20-

C02

503

TOTAL

ORIGINAL

ANALYSIS

63.10

.19

17.22

4.10

.27

.08

.BO

1.18

5.39

3.10

• 30

3.36

0.00

.97

0.00

0.00

0.00

0.00

0.00

100.06

WATKR-C02-Ft<EE

(100.0)

65.91

.20

17.99

4.28

.28

.08

.84

1.23

5.63

3.24

.31

SI

TI

AL

FE3

FL2

MN

MG

CA

NA

K

P

Hf

HC

s

ATOMS

WEIGHT

29.48

.11

9.11

2.87

.21

.06

.48

.84

4.00

2.57

.13

.04

0.00

.26

0.00

ATOMS

NUMBERS (100.0)

22.83

.05

7.34

1.12

.08

• 02

.43

.46

3.78

1.43

.09

C02 EXCLS5 .32

Q

CB

OR

AH

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HI

IL

TI

RU

AP

CC

WLIGHT NORM

(100.0)

19.16

5.14

19.00

47.28

0.00

0.00

0.00

0.00

0.00

0.00

0.00

2.07

0.00

.60

3.e3

.37

0.00

0.00

,hn

1.53

.32

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

16.26

5.19

19.15

47.67

0.00

0.00

0.00

0.00

0.00

0.00

0.00

8.80

0.00

0.00

0.00

.38

0.00

0.00

.68

1.54

3-COMPONENT

WT.PERCENTS

F 31.99

M 5.86

A 62.15

F 31.13

C 8.40

A 60.4/

N 55.74

K 32.06

C 12.20

MGO/MG0*H:.O

IN FtMICS -
1255

PIEBECKITE TRACHYTE (SAlE Ar. 1256)

13.3SN 43.5t>E, GAeANET-EL-L06ElNAT. W. OF TA-IZ , YEMEN

N.M. SHUKRI AND E.I. BASTA, 195t> (ANALYSED IN LONDON)

SI02

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAU

NA2O

K2O

P2U5

H2O +

H2OC02

SO3

TOTAL

Q

en

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

M60/M60+FEO

IN FEMICS =

ORIGINAL

ANALYSIS

69.74

.25

14.16

2.86

.29

.05

.28

.61

4.68

5.29

.05

1.07

.29

.17

0.00

0.00

0.00

0.00

0.00

99.79

WEIGHT NORM

(100.0)

21.30

.10

31.85

40.34

1.69

0.00

0.00

0.00

0.00

0.00

0.00

• 71

0.00

.38

2.65

.48

0.00

0.00

.11

.39

1.00

KATEK-C02-FKEE

(100.0)

70.97

.25

14.41

2.91

.30

.05

.28

.62

4.76

5.36

.05

NON-OXIOATION NORM

(FE2O3 CONVERTED TO FEO)

19.33

.10

32.03

40.56

1.70

0.00

0.00

0.00

0.00

0.00

0.00

5.29

0.00

0.00

0.00

.48

0.00

0.00

.11

.40

.17

SI

TI

AL

Ft3

Ft2

MN

MG

CA

NA

K

P

Ht

HC

S

0

ATOMS

WEIGHT

32.58

.15

7.49

2.00

.23

.04

.17

.44

3.47

4.39

.02

.01

.00

.05

0.00

48.75

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

uz

ATOMS

NUMBERS (100.0)

24.58

.07

5.R8

.76

.09

.01

.15

.23

3.20

2.38

.01

62.64

352

42.2

14

3

40

5

3

1

43

15

9

11

23

92

3-COMPONENT

WT.PERCENTS

F 23.51

M 2.09

A 74.40

F ?2.94

C 4.44

A 72.61

N 44.23

K 50.00

No. 1255

REMARKS: Same rock as 1266.

MINERALOGY: Phenocrysts: Euhedral Na-sanidine, less

common and larger anorthoclase. Groundmass: Trachytic

texture; sanidine, riebeckite, aegirine, iron-oxides.

OTHER INFORMATION: Mode: 77. 5% sanidine, 10%

anorthoclase, 9. 5% riebeckite, 3% magnetite and

haematite.

No. 1256

REMARKS: Same rock as 1255; no separate determination of H_O-.

MINERALOGY: See under 1255.

No. 1257

REMARKS: Same rock as 1258.

MINERALOGY: Phenocrysts: Anorthoclase, scarce An8,

scarce dark-brown biotite. Groundmass: Trachytic

texture; anorthoclase, rare aegirine-augite,

katophorite, magnetite-haematite, quartz.

OTHER INFORMATION: Mode: 74. 2% anorthoclase,

4% quartz, 5. 1% albite, 15. 5% iron-oxides (altered

femics), 1.2% biotite and chlorite.
1Z56

RIEBECKITL TKACHYTE (SA11E AS 1255)

13.38N 43.55E, GABANET-EL-LOGEINAT , M. OF TA-IZ. YEMEN

N.M. SHUKRI AND £.2. 6ASTA, 1955 (ANALYSED IN CAIRO)

SIU2

TI02

AL2O3

FE2O3

FEU

MNU

MGO

CAO

NA2O

K2O

P2O5

H2G*

HZOCO2

SO3

TOTAL

ORIGINAL

ANALYSIS

68.18

.50

11.64

5.60

.36

.08

.72

1.12

4.19

4.72

.28

1.70

0.00

.90

0.00

0.00

0.00

0.00

0.00

99.99

fcATER-COz-FREE

(100.0)

70.01

.51

11.95

5.75

.37

.08

.74

1.15

4.30

4.85

.29

SI

TI

AL

FE3

Ft2

MN

MG

CA

NA

K

P

H-f

HC

S

ATOMS

WEIGHT

31.85

.30

6.16

3.92

.28

.06

.43

.80

3.11

3.92

.12

.02

0.00

.25

0.00

ATOMS

NUMBERS (100.0)

24.52

4

1

2

2

14

93

52

11

02

39

43

92

17

09

NORM C02 EXCESS

0

CB

OR

AS

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

WEIGHT MOF'M

(100.0)

25.40

0.00

28.46

34.13

0.00

o.oo

0.00

1.79

0.00

0.00

0.00

1.R3

0.00

0.00

5.09

cc

MGu/MGO + FF.0

IU FEI-K.S =

.28

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

22.48

0.00

28.77

34.51

0.00

0.00

0.00

0.00

.48

0.00

0.00

10.42

0.00

0.00

0.00

.98

0.00

0.00

• 63

1.45

.22

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F 38.23

M 4.62

A 57.15

F 37.27

C 7.00

A 55.7?

N 41.77

K 47.06

C 11.17

1257

ANORTi-iOCLASt-jlOTITE TKAcyTE

13.35N 44.00E. TA-I7 , YEMEN

N.M. SHUKKI AND F.Z. RASTA, 1955

(SA,.iE AS 1258)

(ANALYSED IN LONDON)

SI02

TIOZ

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K20

P205

H2O*

H2OCO2

SOi

TOTAL

ANALYSIS

69.94

.60

14.43

2.30

• 57

.08

.77

.40

5.33

5.01

.10

.56

.18

0.00

0.00

0.00

0.00

0.00

0.00

99.77

»ATER-C02-FREE

(100.0)

70.63

.61

14.57

2.32

.58

.08

.27

.40

5.38

5.06

.10

SI

TI

AL

FE3

FE2

MN

Mti

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

32.68

.36

7.63

1.61

.44

.06

.16

.29

3.95

4.16

.04

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0

24.42

5

3

2

16

94

61

.17

.02

14

15

61

23

03

0

CR

OR

AH

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HI

IL

TI

RU

AP

CC

MGO/MG0*FEO

IN FEMC5 =

*EIGHT NORM

(100.0)

18.94

0.00

29.98

45.66

• 58

0.00

0.00

0.00

0.00

.65

0.00

.38

0.00

.37

2.07

1.15

0.00

0.00

.22

0.00

1.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

17.34

0.00

30.12

45.86

.58

0.00

0.00

0.00

0.00

.73

0.00

3.99

0.00

0.00

0.00

1.16

0.00

0.00

.22

0.00

.20

NlGGLl

C

ALK

C/FM

QZ

3-COKPONENT

WT.PERCENTS

F 21.29

M Z.OO

A 76.71

F ?1.09

C 2.94

A 75.97

N 49.63

K 46.65

C 3.72
1258

ANORTHOCLASL-JIUTU E TRACHYTE (SAN E AS 1257)

13.35i^ 44.00E, TA-I/, YtMLf.

N.M. SHUKKl Ai-iC; t.Z. P.AS1A, ls">5 <AUALYSEO IN CA1KO)

SIO2

7102

AL203

FE2O3

FF.J

MHO

MOO

CAO

NA20

K20

P2U5

H20 +

H20-

C02

OKItli-iAL

ANALYSIS

69.06

.60

IS. 01

I.f5

1.37

.05

• U

.74

^.34

<t.79

0.00

.06

0.00

1.01

o.no

u.oo

0.00

0.00

0.00

hATER-C02-FREE

(100.0)

SI

Tl

AL

Ft3

Ft2

ATOMS

WEIGHT

3Z.26

.36

7.9<.

1.15

1.06

ATOMS

NUMBERS (100.0)

NORM C02 EXCESS

In FEMCi =

.43

(1OO.O)

1'). 21

1.01

2b.45

45.41

0.00

O.CO

O.PO

0.00

0.00

0.00

0.00

• ftl

0.00

2.40

0.00

1.14

U.OO

o.co

0.00

1.33

.43

NON-OXIDATION NORM

(fE2O3 CONVERTED TO FEO)

17.51

1.02

28.55

45.55

0.00

0.00

0.00

0.00

0.00

0.00

0.00

4.46

0.00

0.00

0.00

1.15

0.00

0.00

0.00

1.33

336

43.1

0.00

.30

3-COMPONENT

WT.PERCENTS

F 22.72

M l.OS

A 76.22

F ?1.74

49.13

44.07

6.SI

No. 1258

REMARKS: Same rock as 1257; no separate determination of H-O-.

MINERALOGY: See under 1257.

No. 1259

REMARKS: No separate determination of H O-.

MINERALOGY: Phenocrysts: Na-sanidine. Groundmass:

Quartz-feldspar microspherulites, riebeckite.

OTHER INFORMATION: Mode: 36. 5% quartz, 50. 5%

Na-sanidine, 13% riebeckite. Aegirine-katophorite

pantellerites occur at Hais, Wessil, Hadjellah, Manaka.

No. 126 0

REMARKS: Same rock as 1261; no separate determination

of H2O-.

MINERALOGY: See under 1261.
1259

COt-iEN^ITF.

13.3511 44.00E, 1A-I7 , yFM.N

N.rt. SHUKIU AND t.<: . t'AbIA, 19

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGU

CAu

NA2O

K2O

P?O5

H2O*

H2UC0 2

5 0 3

TOIAL

UHIc INAl

ANALYSIS

73.42

0.00

10.49

1.72

. 9 7

. 0 5

o.on

2.22

4.56

4.20

. 2 7

1.88

0.00

. 7 0

0.00

0.00

0.00

0.00

0.00

100.48

•.ATER-C02-FREE

(100.0)

74.99

0.00

10.72

1.76

0.00

2.27

4.66

S I

T I

AL

F t 3

F t 2

Mil

MCj

CA

NA

K

ATOMS

HEIGHT

34.30

0.00

5.55

1.20

• 75

. 0 4

0.00

1.59

3.3S

3.49

ATOMS

NUMREHS (100.0 )

25.92

0.00

4.37

. 4 6

. 2 9

. 0 1

0.00

. 8 4

3.12

1.R9

«£IGHT NOW

(100.0)

31.89

0.00

25.24

30.97

0.00

O.CO

0.00

5.06

• 59

3.59

. 4 4

0.00

0.00

0.00

0.00

0.00

0.00

U.00

NON-OX I OAT I ON NORM

(I-E2G3 CONVERTED TO FEO)

32,79

0.00

25.33

31.07

0.00

0.00

0.00

0.00

1.93

4.55

0.00

2.10

0.00

0.00

0,00

0,00

0,00

0,00

S I

AL

FM

c

ALK

K

M6

T I

P

C/f-M

oz

4 1 1

34.7

12.1

13.4

39.9

. 3 8

0.00

0 . 0

. 6 4

1.11

1 6 7

3-COMPONENT

WT.PERCENTS

F 73.49

M 0.00

A 76.51

F 19.68

C 16.?4

A 64.OH

N 41.53

K 38.25

C 20,22

MGu/MGO+HFO

IN FEMCS =

1260

SpHERULlTlC HMVULITE (5As,E AS

13.35N 44.00E, lA-I.^, YLhLN

N.M. SHUKfil AND F.Z. LAiTA, 19 b (ANALYSEL) IN CAIRO)

SIU2

TI02

AL2O3

FE2O3

FEO

MNG

Mf,0

CAu

NA20

<20

P2U5

H2U*

H20-

C02

S03

AflALYSI

7 6

0

1 1

1

0

0

3

4

• RH

. 0 0

. 0 2

.HO

. 3 6

. 0 0

. 0 0

. 7 4

. 3 8

. 7 7

0.00

.?3

0.00

0.00

0.00

0.00

0.00

99.96

»,ATER-COi-FREE

7 7

0

1 1

1

0

0

. 5 9

. 0 0

. 1 2

. 8 2

. 3 6

. 0 0

. 0 0

(100.0)

S I

T I

AL

F t 3

F L 2

MN

Mb

CA

NA

K

ATOMS

(.EIGHT

35.92

0.00

5.83

1.26

. 2 8

0.00

0.00

. 5 3

2.51

3.96

ATOMS

NUI'lfeEHS (100.0 )

26.66

0.00

4.50

. 4 7

. 1 0

0.00

0.00

.78

2.27

2.11

0

C'l

OR

AP

AN

NF

LC

AC

NS

0 1

WO

HY

OL

I T

H--1

I L

T I

RU

A "

cc

MGO/MCJO»H"0

I N FEUICS =

ntlGHT f«04M

(100.0)

3M.61

0.00

2K.47

23.C8

. 7 5

0.00

0.00

0.00

0.00

0.00

. 2 7

0.00

0.00

1.17

1.01

0.00

0.00

0.00

. 3 1

• 53

0.00

NON-OXIDATION NORM

(TE2O3 CONVERTED TO FEO)

37.21

0.00

28.57

28.98

, 7 5

0.00

0.00

0.00

0.00

. 5 9

0.00

3.07

0.00

0.00

0.00

0.00

0.00

0.00

. 3 1

. 5 3

0.00

.4R

0.00

0.0

3-COMPONENT

WT.PERCENTS

F 20.9b

38.0?

53.66
SPHE&ULITIC RHYOLH E (5A E AS 12-,0)

13.35H 44.00E, TA-I:, YEMLiN

N.rt. iHUKkl A.^U F.Z. TAS1A, 1955 (ANALYSED IN LONDON)

SI02

TI02

AL2O3

FE2O3

FFO

MNU

MGO

CAO

NA2O

< 2O

P2O5

H20*

H2OCO2

SO3

TOTAL

0

CB

OR

AR

AN

NE

LC

AC

NS

DI

wn

HY

OL

MT

HM

I L

T I

RU

AP

CC

Okld-ML

ANALYSIS

77.01

. 1 5

11.30

l.f>3

. 2 5

. 0 2

. 0 4

. 1 5

3.40

5.47

. 0 2

• 39

. 0 7

. 0 1

0.00

0.00

0.00

o.oo

0.00

99.91

WtlGHT WPM

(100.0)

36.44

0.00

32.60

27.77

0.00

0.00

o.oo

1.09

0.00

. 2 2

.12

0.00

0.00

. 4 4

. 9 6

. 2 9

0.00

0.00

. 0 4

. 0 2

nATER-C02-FREE

(100.0)

77.44

. 1 5

11.36

1.64

. 2 5

. 0 2

. 0 4

. 1 5

3.42

5.50

. 0 2

NON-OXIDATION NORM

(FE2O3 CONVFKTED TO FEO)

35.75

0.00

32.70

27.86

0.00

0.00

0.00

0.00

. 2 9

. 5 1

0.00

2.54

0.00

0.00

0.00

. 2 9

0.00

0.00

. 0 4

. 0 2

S I

TI

AL

Ft3

F t 2

MN

Mb

CA

NA

K

P

H *

H -

C

S

0

ATOMS

HEIGHT

35.98

. 0 9

5.98

1.14

. 1 9

. 0 2

.02

. 1 1

2.52

4.54

. 0 1

. 0 0

. 0 0

. 0 0

0.00

49.30

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C F M

OZ

ATOMS

NUMBERS

26.62

4

2

2

0 4

6 0

4 2

0 7

0 1

0 2

0 6

2 8

4 1

0 1

63.46

5 0 8

44.0

10.0

1 . 1

44.9

. 5 1

. 0 4

. 7

. 0 6

. 1 1

2 3 1

(100.0)

3-COMPONENT

WT.PERCENTS

F

w

A

F

C

A

N

<

C

D.I.

17.4?

. 3 7

82.21

17.25

1.3R

H1.3R

37.69

60.64

1.66

97.9?

No. 1261

REMARKS: Published summation is 99. 90; same rock

as 1260.

MINERALOGY: Phenocrysts: Corroded quartz, Nasanidine. Groundmass: Up to 80% spherulitic quartzfeldspar intergrowth, also micrographic texture with

myrmekite, some haematite and magnetite, no femics.

OTHER INFORMATION: Mode: 35.9% quartz, 61.7%

Na-sanidine, 2. 3% iron-oxides. Also, a comendite

from El-Barh (between Ta'iz and Mokha) contains

77.24% SiO2, 4. 14% Na2O, 3.77% I^O, and is composed

of quartz and Na-Sanidine phenocrysts, in a fluidal,

microspherulitic ground mass with aegirine.

No. 1262

MINERALOGY: Phenocrysts: Oligoclase-andesine,

orthoclase, small, sometimes euhedral olivine ca.

Fa70, pale-green diopside (euhedral). Groundmass:

An30 microlites (trachytic texture), magnetite,

orthoclase, pyroxene, olivine, apatite, rare glass.

OTHER INFORMATION: Mode: 56. 7% oligoclase-andesine,

10. 0% orthoclase, 7.2% olivine, 5. 3% diopside-augite,

19- 6% magnetite and haematite, 1. 2% apatite.

No. 1263

REMARKS: MnO absent; no separate determination of

H

2 ° -

MINERALOGY: Phenocrysts: Anorthoclase/Na-sanidine,

aegirine-augite, rare albite. Groundmass: Pale-grey

perlitic glass, aegirine-augite microlites.

OTHER INFORMATION: Mode: 31.5% Na-sanidine,

3.3% aegirine-augite, 63.2% glass.
TI<ACHYANDESITE

• JEBEL MADID, ADEIX

SHUKCI AND F.2 . RAS1A, 1959

5102

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

503

TOTAl

ORIGINAL

AUALY5IS

61.44

1.00

14.63

7.63

.73

.15

.54

3.90

5.52

3.26

.19

.80

• 12

o.oo 0.00

0.00

0.00

0.00

0.00

99.91

wATER-cO2-F«EE

(100.0)

62.07

1.01

14.78

7.71

.74

.15

.55

3.94

5.58

3.29

.19

SI

TI

AL

F£3

FE2

MN

M&

CA

NA

K

P

H+

HC

S

ATOMS

WEIGHT

28.70

.60

7.74

5.34

.57

.12

.33

2.79

4.10

2.71

.08

.01

.00

0.00

0.00

ATOMS

NU4RERS (100.0)

22.05

6

2

1

3

1

27

19

06

22

05

29

50

84

49

06

Q

CB

OR

AFl

AM

NE

LC

AC

NS

DI

WO

HY

OL

MT

H"

IL

TI

PU

A?

CC

MGO/MGO*FE10

IN FLiilCS =

WLlCHT KOkM

(100.0)

10.8R

o.oo 19.51

47.29

5.50

0.00

0.00

0.00

0.00

2.94

3.81

0.00

0.00

0.00

7.73

1.89

.03

0.00

.42

0,00

1.00

NON-OX I DAT I ON NORM

(FE2O3 CONVERTED TO FEO)

5.74

0.00

19.80

48.00

5.58

0.00

0.00

0.00

0.00

11.53

0.00

6.98

0.00

0.00

0.00

1.95

0.00

0.00

.43

0.00

.14

SI

AL

FM

C

ALK

223

31.3

26.5

15.2

27.0

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 47.29

M 3.05

A 49.66

F 39.73

C 18.54

A 41.73

N 43.53

K 25.71

C 30.76

1263

HYALO PANTELLLklTL

, jEfEL i.ADID, ADtN

H.M. SHUKkl Mil/ E.Z. RASTA, 1959

SIU2

TIU2

AL2O3

FE2O3

FEO

MNO

MCU

CAO

NA20

K20

P2O5

H20+

H20-

C02

S03

TOTAL

URIClNAl

ANALYSIS

64.44

.20

12.86

3.26

2.83

0.00

.31

2.71

3.86

4.77

0.00

4.44

0.00

.48

0.00

0.00

0.00

0.00

0.00

100.16

«ATER-C02-FREE

67.66

.21

13.50

3.42

2.97

0.00

.33

2.85

4.05

5.01

0.00

(100.0)

SI

TI

AL

FE3

Fh2

MN

Mb

CA

NA

K

P

H*

Hc

s

ATOMS

WEIGHT

30.11

.12

6.80

2.28

2.20

0.00

.19

1.94

2.86

3.96

0.00

.05

0.00

.13

0.00

ATOMS

NUMBERS (100.0)

23.88

.06

5.62

.91

.88

0.00

.17

1.08

2.77

2.26

0.00

0

CB

OR

An

AM

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

Ac

CC

IN FEMC S '=

WEIGHT NORC.

(1OO.O)

19.94

C O O

29.53

34.21

3.77

0.00

0.00

0.00

0.00

6.03

.04

0.00

0.00

4.95

0.00

.40

0.00

0.00

0.00

1.14

.32

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

16.45

0.00

29.72

34.43

3.80

0.00

0.00

0.00

0.00

6.33

0.00

7.73

0.00

0.00

0.00

.40

0.00

0.00

0.00

1.15

.09

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

c

40.5?

2.06

57.42

34.94

15.55

49.51

34.04

42.06

23.90
1264

OLIVINE BASALT

14.50M 4O.19E, MT. AH.AttO. ERITREA

R. FILJAIW- N. GLUMICIC. 7. 7A&ORAC, 1959

SIU2

T1O2

AL2O3

FE2O3

FFO

HNO

MGO

CAO

NA2O

K2O

P2O5

H2O+

H2OCO2

S03

ORIGINAL

ANALYSIS

47.64

1.35

18.06

1.66

6.00

.19

8.10

12.02

2.40

.76

0.00

1.81

.34

0.00

0.00

0.00

0.00

0.00

kATER-C02-FREE

(100.0)

48.52

1.38

18.39

1.69

6.11

.19

8.25

12.24

2.44

.77

0.00

SI

TI

AL

FE3

Ft2

Mil

Mb

CA

NA

K

P

H»

HC

S

0

ATOMS

WEIGHT

22.26

.81

9.56

1.16

4.66

.15

4.89

8.59

1.78

.63

0.00

.02

.00

0.00

0.00

45.82

ATUMS

NUMBERS (100.0)

17.56

7

1

4

4

1

0

37

85

46

85

06

46

75

72

36

00

60.56

Q

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

H*l

IL

TI

RU

AP

ccMGO/MGO+KEO

IN FtMC S =

wLlGHT NORM

( LOO.O)

0.00

0.00

4.58

19.79

36.90

.SO

0.00

0.00

0.00

19.27

0.00

0.00

13.88

2.46

0.00

2.61

0.00

0.00

0.00

0.00

.77

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

4.60

17.90

37.02

1.56

0.00

0.00

0.00

19.55

0.00

0.00

16.75

0.00

0.00

2.62

0.00

0.00

0.00

0.00

.70

NIGGL1

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

106

23.7

41.3

28.7

6.3

.17

.65

2.3

0.00

.70

-19

3-COMPONENT

WT.PERCENTS

F 40.49

M 42.81

A 16.70

F 33.54

C 52.63

A 13.84

N 15.81

K 5.01

C 79.18

No. 1264

MINERALOGY: Incomplete description. Phenocrysts:

Olivine. Groundmass: An70, scarce magnetite, some

calcite.

OTHER INFORMATION: Occurs intercalated in the

Lower Dogali Beds.

No. 1265

MINERALOGY: Incomplete description. Groundmass:

An70, abundant magnetite.

OTHER INFORMATION: Occurs intercalated in the

Lower Dogali Beds. Manasse (1908) notes the occurrence of a porphyritic uralite basic rock from Desset

(where Neogene sediments outcrop).

No. 1266

REMARKS: Published summation is 100.08.

MINERALOGY: Phenocrysts: Abundant An23, somewhat

altered and with inclusions of apatite, augite. Groundmass: Plagioclase, green pleochroic augite rimmed and

fissured with chlorite and magnetite, strongly corroded

hornblende.
1265

PASALT

14.50N 40.19E, MT . AFNA 0, ERITREA

R.FILJAK, N. &LUMICIC, Z.ZAiiORAC, 1959

SI 02

T102

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORI&INAL

ANALYSIS

48.13

2.00

17.05

6.40

6.65

.14

5.33

9.21

2.81

• 66

0.00

1.03

1.02

0.00

0.00

0.00

0.00

0.00

0.00

100.43

^ATER-C02-FREE

(100.0)

48.92

2.03

17.33

6.51

6.76

.14

5.42

9.36

2.86

.67

0.00

SI

TI

AL

FE3

FE2

MN

M&

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

22.49

1.20

9.02

4.48

5.17

.11

3.22

6.58

2.08

.55

0.00

.01

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

17.97

.56

7.50

1.80

2.08

.04

2.97

3.69

2.04

.31

0.00

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

1L

TI

RU

AP

CC

MGO/MG0*FE0

IN FEMK S =

wElGHT NORM

(100.0)

2.68

0.00

3.97

24.22

32.45

0.00

0.00

0.00

0.00

11.26

0.00

12.11

0.00

9.45

0.00

3.P6

0.00

0.00

0.00

0.00

• 82

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

4.02

24.52

32.86

0.00

0.00

0.00

0,00

11.94

0.00

10.52

12.23

0.00

0.00

3.91

0.00

0.00

0.00

0.00

.48

3-COMPONENT

WT.PERCENTS

F 59.71

M 24.39

A 15.88

F 50.72

C 35.79

A 13.49

N 22. 1A

K 5.21

C 72.63

1266

ANDES ITE

14.30N 40.50E, ADAYLO, fcPlTREA

R. FILJAK, N. GLUMCIC, 7. ZA&ORAC,

SI02

TI02

AL203

FE2O3

FEO

MNU

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

5b.49

.68

IB.55

6.09

l.f-7

.25

1.65

4.32

6.33

2.12

o.no

1.79

.17

0.00

0.00

o.oo

0.00

0.00

0.00

100.11

WATER-C02-FREE

(100.0)

57.55

.69

18.90

6.20

1.70

.25

1.68

4.40

6.45

2.16

0.00

SI

TI

AL

Ft3

Ft2

MN

M6

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

26.39

.41

9.81

4.26

1.30

.19

1.00

3.09

4.70

1.76

0.00

.02

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

20.38

7

1

I

4

0

18

89

66

50

08

89

67

43

98

00

0

OR

A3

AN

NE

LC

AC

NS

DI

WO

HY

OL

«T

HI

1L

TI

Rl)

AP

CC

MGO/MGCtFEU

IN FIMICS ='

fct1GHT NORM

(10O.O)

.88

0.00

12.80

b'

H

.69

.17

.00

.00

.00

.00

.45

),00

.13

.00

.32

.24

.32

0.00

0.00

0.00

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

12.95

52.81

16.37

1.37

0.00

0.00

0.00

4.95

0.00

0.00

10.22

0.00

0.00

1.33

0.00

0.00

0.00

0.00

.32

SI

AL

FM

C

ALK

178

34

27

14

23

3-COMPONENT

WT.PERCENTS

F 43.45

M 9.24

A 47.31

F 37.80

C 71.04

A 41.16

N 49.57

K 16.60

C 33.83
1267

P0RPHYR1TIC COI-.ENOlTt

14.5011 40.19E, i*T. AfNd.,0, ERITREA

R. FILJAK, N. GLJMCIC, 7. 2AGCRAC, 1959

sru2

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2G

P2O5

H2O+

H2OCO2

SO3

TOTAL

ORIGINAL

ANALYSIS

75.51

0.00

11.62

2.39

.08

0.00

.08

.35

3.83

4.R0

0.00

.57

.63

0.00

0.00

0.00

0.00

0.00

o.oo 99.H6

KATER-C02-FREE

(100.0)

76.54

0.00

11.78

2.42

.08

0.00

.08

.35

3.SB

4.87

0.00

SI

TI

AL

FE3

FL2

MM

Mi

CA

NA

P

H*

HC

s

0

ATOMS

«£IGHT

35.28

0.00

6.15

1.67

.06

0.00

.05

.25

2.84

3.98

0.00

.01

.01

0.00

0.00

49.56

ATOMS

NUMRERS (100.0)

26.31

0.00

4.77

.63

.02

0.00

.04

.13

2.59

2.14

0.00

63.37

0

CH

OR

An

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

Rl J

AP

CC

MGO/MGOtFtO

IN FEhlCS =

HEIGHT NORM

(100.01

34.62

o.oo 28.R4

32.94

.27

0.00

0.00

0.00

0.00

.44

.39

0.00

0.00

.26

2.25

0.00

0.00

0.00

0.00

0.00

1.00

NON-OX I DAT I ON NORM

(FE2O3 CONVERTED TO FEOI

33.05

0.00

28.97

33.09

.28

0.00

0.00

0.00

0.00

1.32

0.00

3.28

0.00

0.00

0.00

0.00

0.00

0.00

0.00

o.oo

.07

NIGGLI

SI

AL

FM

C

ALK

K.

MG

TI

P

C/FM

OZ

471

42.8

12.<•

2.3

42.4

.45

.06

0.0

0.00

.19

202

3-C0MP0NENT

WT.PEHCENTS

F

M

A

F

C

A

N

K

C

D.I.

22.09

77

21

3

75

42

53

3

72

19

57

.06

37

65

45

90

96.86

No. 1267

REMARKS: Published summation is 99.96; TiO2 and

MnO traces; potassic rock.

MINERALOGY: Phenocrysts: Corroded sanidine, uncommon euhedral quartz. Groundmass: Spherulitic,

devitrified cristobalite grains, tridymite aggregates,

intense-green pyroxene (non-pleochroic) — aegirineaugite(?).

No. 1268

REMARKS: Also for 1270, 1274, 1275, 1276, 1277.

MINERALOGY: General description for the above

numbered specimens. Phenocrysts: Zoned An50-40

(not always present). Groundmass: Microlites An40-28,

glass with small crystals olivine (Fa20-30, occasionally

Fa50), and later titanaugite, iron-oxides, no orthopyroxene, no pigeonite.

OTHER INFORMATION: This is the most abundant rocktype of the Erta-ali volcanic chain. The basalts have a

high TiO_ content and high Na/K. The norms are

frequency quartz-bearing.

No. 1269

MINERALOGY: Phenocrysts: Abundant small olivines

(Fal5-20), An70, titanaugite. Groundmass: An60-55,

titanaugite, olivine, scarce black glass with iron-oxides,

late-stage alkali feldspar.
1268

ANDES1NE BASALT

13.27* 40.32E .

H. TAZIEFF £T AL.i

S.W. BASE ALI RAr,U, N. AFAR

SI02

TI02

AL2O3

FE2O3

FEO

CNO

MGG

CAO

NA20

K2U

P2O5

H2O*

H2OCO2

SO 3

TOTAL

ORI&IMAL

ANALYSIS

47.17

3.20

10.80

7.37

8.00

.19

6.45

10.64

2.95

.90

.36

• 87

.77

0.00

0.00

0.00

0.00

0.00

0.00

99.67

WATER-C02-FREE

(100.0)

48.12

3.26

11.02

7.52

8.16

.19

6.58

10.85

3.01

.92

.37

SI

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

H +

Hc

s

ATOMS

HEIGHT

22.04

1.92

5.71

5.15

6.22

.15

3.89

7.60

2.19

• 75

.16

.01

.01

0.00

0.00

ATOMS

NUMBERS (100.0

18.02

4

2

2

3

4

2

92

86

12

56

06

68

36

19

44

12

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

I»T

HM

IL

TI

RU

AP

CC

MGO/MGO+FtO

IN FtKItS =

WEIGHT NORM

(100.0)

1.2B

0.00

5.44

25.51

13.80

0.00

0.00

0.00

0.00

30.21

0.00

5.84

0.00

10.92

0.00

6.19

0.00

0.00

.PO

0.00

.85

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

5.52

23.63

14.01

1.22

0.00

0.00

0.00

32.17

0.00

0.00

16.36

0.00

0.00

6.28

0.00

0.00

.81

0.00

.50

c

ALK

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F 59.88

M 25.13

A 15.00

F 51.47

C 35.63

A 12.89

N 20.36

K 6.21

C 73.43

1269

ANKARAMITIC liASALT

13.57N 40.22E. oASE Of" SALT DOME.

H. TAZIEFF ET AL.. 1969

S. END L. ASSALE («ARUM). N. AFAR

SIOZ

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2G*

H2OC02

SO3

TOTAL

ANALYSIS

47.93

1.77

11.31

4.31

7.87

.11

11.85

10.60

2.30

.41

.24

.21

1.00

0.00

0.00

0.00

0.00

0.00

0.00

99.91

WATER-C02-FREE

(100.0)

48.56

1.79

11.46

4.37

7.97

.11

12.01

10.74

2.33

.42

.24

Tl

AL

FE3

FE2

ATOMS

WEIGHT

22.39

1.06

5.98

3.01

6.12

.09

7.15

7.58

1.71

0.00

0.00

ATOMS

NUMBERS (100.0)

17.81

.50

4.95

1.21

2.45

.03

6.58

4.22

1.66

0

en

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGU/MGO+FEO

IN FEMICS =

WEIGHT NORM

(100.0)

0.00

0.00

2.46

19.75

19.55

0.00

0.00

0.00

0.00

25. P7

o.oo 12.41

9.68

6.34

0.00

3.40

0.00

0.00

.53

0.00

.83

NON-OX I DAT ION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

2.48

19.92

19.72

0.00

0.00

0.00

0.00

26.62

0.00

4.51

22.79

0.00

0.00

3.43

0.00

0.00

.54

0.00

.68

. 2 1

. 4 1

3-COMPONENT

WT.PERCENTS

F 45.55

M 44.3?

A 10.13

F 47.78

C 41.5H

A 10.63

N 17.28

K 3.08

C 79.64
1270

BASALT

13.19N 40.

H. TAZIEFP

46E

ET

«

AL.

FISSURE

. 1969

S.E. FLANK ERTA-ALI- ALI BAGU, AFAR

SIo2

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

CO<i

S03

TOTAL

ORIGINAL

ANALYSIS

48.60

2.74

13.10

2.43

10.05

.19

5.52

10.25

3.45

1.10

.60

1.57

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.60

WATER-C02-FREE

49.58

2.80

13.36

2.48

10.25

.19

5.63

10.46

3.52

1.12

.61

(100.0)

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

22.71

1.64

6.93

1.70

7.81

.15

3.33

7.33

2.56

.91

.26

.02

0.00

0.00

0.00

44.25

ATOMS

NUMBERS (100.0)

18.35

.78

5.83

.69

3.18

.06

3.11

4.15

2.53

.53

.19

60.60

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

WEIGHT NORM

(100.0)

0.00

0.00

6.65

29.83

17.31

0.00

0.00

0.00

0.00

25.61

0.00

.34

10.01

3.60

0.00

5.30

0.00

0.00

1.34

0.00

.60

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

6.68

27.31

17.39

1.45

0.00

0.00

0.00

26.06

0.00

0.00

14.44

0.00

0.00

5.33

0.00

0.00

1.34

0.00

.50

NIGGLl

SI

AL

FM

C

ALK

K

MS

TI

P

C/FM

OZ

117

18.6

45.0

26.6

9.8

.17

.44

5.0

.61

.59

-22

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

O.I.

55.34

24.48

20.18

45.75

37.57

16.66

23.31

7.43

69.26

69.33

No. 1270

REMARKS: See under 1268.

No. 1271

MINERALOGY: As for 1269, except plagioclase phenocrysts much more abundant than olivine.

No. 1272

REMARKS: See under 1269.
1271

PORPHYRITIC BASALT

13.22N 40.34E. FISSURE FLOW,

H. TAZIEFF ET AL.» 1969

S.w. FLANK ALI BACJU. N. AFAR

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2U

P2O5

H2O+

H2OCO2

503

TOTAL

ORIGINAL

ANALYSIS

49.26

1.83

15.89

4.79

6.43

.10

5.24

12.02

2.87

.53

.26

• 22

.30

0.00

0.00

0.00

0.00

0.00

0.00

99.74

WATER-C02-FREE

(100.0)

49.65

1.84

16.01

4.83

6.48

.10

5.28

12.11

2.89

.53

.26

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

5

ATOMS

WEIGHT

23.01

1.10

8.41

3.35

5.00

.08

3.16

8.59

2.13

.44

.11

.00

.00

0.00

0.00

ATOMS

NUhBERS (100.0)

18.22

.51

6.93

1.34

1.99

.03

2.89

4.76

2.06

.25

.08

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO*FEO

IN FEMICS =

WEIGHT NORM

(100.0)

1.52

0.00

3.16

24.52

29.10

0.00

0.00

0.00

0.00

23.79

0.00

6.82

0.00

7.01

0.00

3.50

0.00

0.00

.57

0.00

.77

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

3.19

24.75

29.37

0.00

0.00

0.00

0.00

24.88

0.00

3.40

10.29

0.00

0.00

3.53

0.00

0.00

.58

0.00

.52

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

116

22.1

40.0

30.5

7.4

.11

.46

3.3

.26

.76

-13

3-COMPONENT

WT.PERCENTS

F 56.50

M 26.38

A 17.12

42.12

45.12

12.76

1272

ANKARAMITIC BASALT

13.21N 40.52E. FISSURE FLOW .

H. TAZIEFF ET AL.. 1969

IMMEDIATELY W. OF LAKE JULIETTI, AFAR

SJ02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

49.30

1.50

13.40

2.26

8.03

.15

9.32

12.50

2.45

.30

.18

1.06

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.45

t»ATER-C02-FREE

(100.0)

49.60

1.51

13.48

2.27

8.08

.15

9.38

12.58

2.47

.30

.18

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

23.03

.90

7.09

1.58

6.24

.12

5.62

8.93

1.82

.25

.08

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

18.14

.42

5.81

.63

2.48

.05

5.12

4.93

1.75

.14

.06

0

CB

OR

AB

AN

NE

LC

AC

NS

01

WO

HY

OL

MT

HM

IL

TI

RJ

AP

CC

MGO/MGO+FEO

IN FEMICS =

WEIGHT NORM

(100.0)

0.00

0.00

1.79

20.90

24.80

0.00

0.00

0.00

0.00

29.61

0.00

7.12

9.22

3.30

0.00

2.86

0.00

0.00

.40

0.00

.74

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

1.80

20.99

24.91

0.00

0.00

0.00

0.00

30.09

0.00

2.86

16.08

0.00

0.00

2.88

0.00

0.00

.40

0.00

.66

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

106

17.0

48.5

28.9

5.5

.07

.62

2.4

.16

.60

-16

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

46

41

12

40

48

10

.02

.68

.30

.29

.94

.77
1273

PORPHYRITIC BASALT

13.18N 40.42Et FISSURE FLOOD.

H. TAZIEFF ET AL.. 1969

S. FLANK ALI BAGU , AFAR

SIO2

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

SO3

TOTAL

ORIGINAL

ANALYSIS

49.52

1.63

14.85

4.55

6.99

.15

6.25

12.02

2.60

.45

.24

.03

.60

0.00

0.00

0.00

0.00

0.00

0.00

99.88

WATER-C02-FREE

49.89

1.64

14.96

4.58

7.04

.15

6.30

12.11

2.62

.45

.24

(100.0)

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

23.14

.98

7.86

3.18

5.43

.12

3.77

8.59

1.93

.37

.10

.00

.01

0.00

0.00

44.40

ATOMS

NUMBERS (100.0)

18.32

.45

6.48

1.27

2.17

.05

3.45

4.77

1.87

.21

.08

60.89

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN PEM1CS =

WEIGHT NORM

(100.0)

1.67

0.00

2.69

22.21

27.70

0.00

0.00

0.00

0.00

25.07

0.00

10.36

U.00

6.66

0.00

3.12

0.00

0.00

.53

0.00

.75

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

2.71

22.40

27.94

0.00

0.00

0.00

0.00

26.04

0.00

6.22

9.01

0.00

0.00

3.14

0.00

0.00

.53

0.00

.54

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

114

20.

43.'

29.=

6.

.

2.t

.<

,i

10

>0

.4

>9

-12

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

D.I.

55.37

29.99

14.64

43.37

45.17

11.46

17.25

2.99

79.76

64.87

No. 1273

REMARKS: See under 1271.

No. 1274

REMARKS: See under 1268.

No. 1275

REMARKS: See under 1268.
1274

BASALT

13.53N 40.24E.

H. TAZIEFF ET AL.

N.w. BASE ALU. N. AFAR

SI 02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K2U

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

49.80

2.24

13.50

2.37

9.81

.18

6.62

10.90

3.35

.78

.42

.82

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.79

WATER-C02-FKEE

(100.0)

49.81

2.24

13.50

2.37

9.81

.18

6.62

10.90

3.35

.78

.42

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

23.27

1.34

7.14

1.66

7.63

.14

3.99

7.79

2.49

.65

.18

.01

0.00

0.00

0.00

ATuMS

NUMBERS (100.0)

18.36

.62

5.87

.66

3.03

.06

3.64

4.31

2.40

.37

.13

0

CB

OR

AB

AN

NE

LC

AC

NS

01

WO

HY

OL

MT

HM

IL

Tl

RU

AP

CC

MGO/MGOtFEO

IN FEH1CS =

WEIGHT NORM

(100,0)

0.00

0.00

4.62

28.41

19.46

0.00

0.00

0.00

0.00

26.47

0.00

1.95

10.47

3.44

0.00

4.25

0.00

0.00

.92

0.00

.63

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

4.64

26.94

19.55

.86

0.00

0.00

0.00

26.91

0.00

0.00

15.90

0,00

0.00

4.27

0.00

0.00

.92

0.00

.54

SI

AL

FM

C

ALK

114

18

46

26

8

C/FM

QZ

3-COMPONENT

rtT.PERCENTS

F

M

A

F

C

A

N

K

C

53.12

28.87

IB.01

44.76

40.06

15.18

22.29

5.19

72.52

1275

BASALT

13.33N 40.29E.

H. TAZIEFF ET AL.

•I* BASE OF ALI BAGU.

1969

SI02

TI02

AL203

FE2O3

FEO

UNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

49.87

2.39

11.21

5.47

8.23

.14

6.25

11.44

2.65

.60

.29

.26

.40

0.00

0.00

0.00

0.00

0.00

0.00

99.20

V»ATER-C02-FREE

(100.0)

50.61

2.43

11.38

5.55

8.35

.14

6.34

11.61

2.69

.61

.29

SI

TI

AL

FE3

FE2

MN

Mo

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

23.30

1.43

5.93

3.83

6.40

.11

3.77

8.18

1.97

.50

.13

.00

.00

0.00

0.00

ATuMS

NlMBtRS (100.0)

18.79

.68

4.98

1.55

2.60

.04

3.52

4.62

1.94

.29

.09

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO•FEO

IN FEMC S =

WEIGHT NORM

(100.0)

4.06

0.00

3.61

22.80

17.14

0.00

0.00

0.00

0.00

31.35

0.00

7.73

0.00

8.07

0.00

4.60

0.00

0.00

.64

0.00

.75

NON-OXIDAT IUN NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

3.64

23.04

17.32

0.00

0.00

0.00

0,00

32.74

0.00

12.77

5.18

0.00

0.00

4.65

0.00

0.00

.65

0.00

.51

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

118

15.6

48.4

29.0

7.0

.1

.4

W

.1

.6

-10

3-COMPONENT

WT.PERCENTS

F 59.05

48.26

40.30

11.45

18.04

4.08

77.88
1276

BASALT

13.51N 40.28Et

H. TA^IEFF fcT AL.

H. SLOPES ALU,

1969

SIO2

TIO2

AL2O3

FE203

FEO

MNO

M60

CAO

NA2O

K2O

P2Q5

H2O*

H2OCO2

S03

TOTAL

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

ORIGINAL

ANALYSIS

SO. 60

2.10

13.40

1.93

10.10

.19

6.28

10.25

3.35

.67

.36

.72

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.95

HEIGHT NORM

(100.0)

0.00

0.00

4.00

28.62

19.66

0.00

0.00

0.00

0.00

24.36

0.00

10.10

5.63

2.83

0.00

4.02

0.00

0.00

.79

0.00

.60

WATER-C02-FREE

(100.0)

50.99

2.12

13.50

1.94

10.18

.19

6.33

10.33

3.38

.68

.36

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

4.01

28.73

19.74

0.00

0.00

0.00

0.00

24.68

0.00

6.38

11.64

0.00

0.00

4.03

0.00

0.00

.80

0.00

.53

SI

Tl

AL

FE3

FE2

HN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

23.64

1.26

7.09

1.35

7.85

.15

3.79

7.33

2.49

.56

.16

.01

0.00

0.00

0.00

44.29

NIGGLl

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

ATOMS

NUMBERS

18.75

.59

5.85

.54

3.14

.06

3.47

4.07

2.41

.32

.11

60.70

120

18.8

46.3

26.2

8.8

.12

.48

3.8

.36

.57

-15

(100.0)

3-COMPONENT

WT,

F

M

A

F

C

A

N

K

C

D.I.

.PERCENTS

53.87

28.12

18.00

45.74

38.97

15.29

23.48

4.7U

71.83

65.70

No. 1276

REMARKS: See under 1268.

No. 1277

REMARKS: See under 1268.

No. 1278

MINERALOGY: Aphyric; dark rocks extremely finegrained. Groundmass: Abundant glass with magnetite,

abundant sodic plagioclase (ca. 50% mode), some palecoloured clinopyroxene.

OTHER INFORMATION: Forms flows at the northern

end of the Erta-ali chain, and also an end-phase posterior

to the alkali rhyolites of the chain volcanoes.
1277

BASALT

13.36N 40.396,

H. TAilEFF ET AL.

ERTA-ALI CALDERA,

• 1969

SI02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OC02

SO3

TOTAL

ORIGINAL

ANALYSIS

50.71

3.15

9.07

6.27

11.24

.20

4.83

8.62

3.40

1.17

.42

.32

.63

0.00

0.00

0.00

0.00

0.00

0.00

100.03

WATER-C02-FREE

(100.0)

51.18

3.18

9.15

6.33

11.34

'.20

4.87

8.70

3.43

1.18

.42

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

23.69

1.89

4.80

4.39

8.74

.15

2.91

6.16

2.52

.97

.18

.00

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

19.25

.90

4.06

1.79

3.58

.06

2.74

3.51

2.50

.57

.14

0

C8

OR

AB

AN

NE

LC

AC

NS

DI

wo

HY

OL

MT

HM

IL

TI

RU

Wfc.IGHT NORM

(100.0)

4.29

0.00

6.99

29.09

6.05

0.00

0.00

0.00

0.00

28.60

0.00

8.82

0.00

9.19

0.00

6.03

0.00

0.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

7.08

29.45

6.12

0.00

0.00

0.00

0.00

29.80

0.00

13.30

7.22

0.00

0.00

6.11

0.00

0.00

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

126

13

53

23

10

5

-14

3-COMPuNENT

WT.PERCENTS

F 65.07

M 17.95

A 16.98

F 57.04

C 28.00

A 14.89

N 25.78

K 8.87

C 65.35

MGO/MG0*FEO

IN FEMICS =

1278

SOOIC TRACHYTE

13.58N 40.24E,

H. TAilEFF ET AL.

GADA ALI I

> 1969

S. END L. ASSALE IKARUM)> N. AFAR

SI02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

HZO*

H2QC02

S03

ORIGINAL

ANALYSIS

55.28

.10

).52

>.69

).59

.23

.41

>.44

>.16

1.60

.82

.76

.76

0.00

0.00

0.00

WATER-C02-FREE

56.50

2.15

9.73

6.84

8. 78

.24

2.46

6.58

4.25

1.64

.84

(100.0)

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

p

H*

HC

S

ATOMS

WEIGHT

25.83

1.26

5.04

4.68

6.68

.18

1.45

4.60

3.09

1.33

.36

.01

.01

0.00

0.00

AT0M5

NUMBERS (100.0)

20.88

.60

4.24

1.90

2.72

.07

1.36

2.61

3.05

.77

.26

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

WEIGHT NORM

(100.0)

11.77

0.00

9.69

36.05

2.58

0.00

0.00

0.00

0.00

20.99

0.00

3.08

0.00

9.94

0.00

4.07

0.00

0.00

1.83

0.00

.52

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

4.61

0.00

9.81

36.53

2.62

0.00

0.00

0.00

0.00

22.03

0.00

18.41

0.00

0.00

0.00

4.13

0.00

0.00

1.86

0.00

.26

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

65.16

10.28

24.56

55.60

23.44

20.96

34.10

13.11

52.79
1279

SODIC TRACHYTE

13.48N 40.32E. RECENT FLOw<

H. TAZIEFF ET AL.» 1969

ALU SUMMIT. N. AFAR

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H2O*

H2OCO2

503

TOTAL

ORIGINAL

ANALYSIS

66.30

2.21

10.65

4.97

8.76

.22

3.43

5.60

4.95

1.25

.70

.23

.63

0.00

0.00

0.00

0.00

0.00

0.00

99.90

WATER-C02-FREE

(100.0)

56.85

2.23

10.75

5.02

8.84

.22

3.46

5.65

5.00

1.26

.71

51

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

5

0

ATOMS

WEIGHT

26.30

1.32

5.63

3.48

6.81

.17

2.07

4.00

3.67

1.04

.31

.00

.01

0.00

0.00

45.08

ATOMS

NUMBERS (100.0)

20.78

.61

4.63

1.38

2.71

.07

1.89

2.22

3.54

.59

.22

61.36

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

wo

HY

OL

MT

HM

IL

TI

RU

AP

ccMG0/MG0*FEO

It* FEM1CS =

WEIGHT NORM

(100.0)

7.75

0.00

7.48

42.38

3.13

0.00

0.00

0.00

0.00

17.25

0.00

8.95

0.00

7.29

0.00

4.23

0.00

0.00

1.55

0.00

.56

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

2.48

0.00

7.55

42.79

3.16

0.00

0.00

0.00

0.00

17.91

0.00

20.29

0.00

0.00

0.00

4.28

0.00

0.00

1.56

0.00

.36

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F 58.78

M 14.68

A 26.54

F 53.78

C 21.93

A 24.29

N 41.95

K 10.59

C 47.46

No. 1279

REMARKS: See under 1278.

No. 1280

REMARKS: No separate determination of H2O-.

MINERALOGY: Phenocrysts: Scarce An28, colourless

pyroxene, fayalite. Groundmass: Glass, with very finegrained anorthoclase and tridymite (determined by Xrays).

OTHER INFORMATION: Forms dark blocky lava in

flows 30-50 m thick.

No. 1281

REMARKS: See under 1280.
1280

SODIC TRACHYTE

13.26N 40.40E*

H. TAZIEFF ET AL.

ALI BA

> 1969

SUMMIT. S. SIDE. N. AFAR

5102

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

63.10

1.07

12.40

1.26

6.79

.20

1.24

3.58

5.00

3.53

.37

.65

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.19

WATER-C02-FREE

(100.0)

64.03

1.09

12.58

1.28

6.89

.20

1.26

3.63

5.07

3.58

.38

SI

Tl

AL

FE3

FE2

MN

M&

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

29.48

.64

6.56

.88

5.28

.15

.75

2.56

3.71

2.93

.16

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

22.83

.29

5.29

.34

2.06

.06

.67

1.39

3.51

1.63

.11

0

CB

OR

AB

AN

NE

LC

AC

NS

01

WO

HY

OL

MT

HM

aTI

RU

AP

CC

MGO/MGO+FEO

IN FEMIC5 =

WEIGHT NORM

(100.0)

10.50

0.00

21.22

43.04

.91

0.00

0.00

0.00

0.00

12.84

0.00

6.75

0.00

1.86

0.00

2.06

0.00

0.00

.82

0.00

.29

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

9.17

0.00

21.28

43.14

.91

0.00

0.00

0.00

0.00

12.96

0.00

9.65

0.00

0.00

0.00

2.07

0.00

0.00

.82

0.00

.24

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

234

27.1

32.2

14.3

26.4

.32

.21

3.0

.58

.44

28

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

D.I.

45.17

6.96

47.S7

39.93

17.76

42.31

41.29

29.15

29.56

86.65

1281

SODIC TRACHYTE

13.27N 40.40E.

H. TAZIEFF ET AL.

ALI BA

• 1969

SUMMIT. S. SIDE. N. AFAR

SI02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

64.00

1.09

12.60

1.48

6.41

.23

1.22

3.54

4.90

3.55

.40

.97

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.39

WATER-C02-FREE

(100.0)

64.37

1.10

12.67

1.49

6.45

.23

1.23

3.56

4.93

3.57

• 40

SI

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

HEIGHT

29.90

.65

6.67

1.04

4.98

.18

.74

2.53

3.64

2.95

.17

.01

0.00

0.00

o.oo

ATuMS

NUMBERS (100.0)

22.92

.29

5.32

.40

1.92

• 07

.6b

1.36

3.40

1.62

.12

Q

CB

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

WEIGHT NORM

(100.0)

12.12

0.00

21.16

41.80

1.84

0.00

0.00

0.00

0.00

11.57

0.00

6.38

0.00

2.16

0.00

2.08

0.00

0.00

.88

0.00

.30

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

10.58

0.00

21.22

41.92

1.85

0.00

0.00

0.00

0.00

11.70

0.00

9.77

0.00

0.00

0.00

2.09

0.00

0.00

.88

0.00

.24

SI

AL

FM

C

ALK

239

27. 7

31. a

14.2

26.3

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F 44.93

39.69

17.81

42.51

40.87

29.61

29.52
1282

PANTELLER1TE

13.16N 40.57E«

H. TAilEFF ET AL.

CONE.

• 1969

S. FLANK. bARAULI. L. JULItTTI . N. AFAR

S1U2

TI02

AL203

FEZO3

FEU

MNO

MGO

CAO

NA20

K2O

P2O5

H2O*

H2OCO2

SO3

TOTAL

ORIGINAL

ANALYSIS

67.00

.36

12.50

3.60

2.07

.27

.04

1.25

6.40

5.55

.02

.60

0.00

0.00

0.00

0.00

0.00

o.oo 0.00

99.66

KATER-C02-FREE

67.6*

.36

12.62

3.63

2.09

.27

. 0*

1.26

6.46

5.60

.02

(100.0)

SI

Tl

AL

FE3

FE2

MM

MO,

CA

NA

K

P

H*

HC

S

0

ATOMS

HEIGHT

31.30

.22

6.61

2.52

1.61

.21

.02

.89

4.75

4.61

.01

.01

0.00

0.00

0.00

46.90

ATOMS

NUMBERS (100.0)

23.79

.10

5.23

.96

.62

.OB

.02

.48

4.41

2.52

.01

61.80

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

ccMGO/MGO+FEO

IN FEMICS =

WEIGHT NORM

(100.0)

13.31

0.00

33.20

33.65

0.00

0.00

0.00

10.54

2.14

5.47

0.00

.96

0.00

0.00

0.00

.69

0.00

0.00

.04

0.00

.03

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

15.06

0.00

33.43

33.89

0.00

o.oo 0.00

0.00

4.96

5.52

o.oo 6.41

0.00

0.00

0.00

.69

0.00

0.00

.04

o.oo

.01

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

288

31.7

20.4

5.B

42.1

.3

.0

1.2

.0

.2

51

3-COMPONENT

WT.PERCENTS

F 32.11

M .23

A 67.67

F 30.05

48.48

42.05

No. 1282

REMARKS: See under 1284.

No. 1283

REMARKS: See under 1284.

No. 1284

REMARKS: Also for 1282, 1283, 1285, 1286. No separate determination of H?O-; H-O+ is loss on heating;

high Na/K ratio in rhyolites (less marked in pantellerites

despite higher total alkalis).

MINERALOGY: Phenocrysts: Anl8, occasional corroded

An38-40, rather uncommon pyroxene and fayalitic

olivine. Groundmass: Predominantly glassy.
1283

PANTELLERITE

12.58N 40.13E.

H. TAZIEFF ET AL.

3KM S.

> 1969

OF GAR-ULI, N. AFAR

SIU2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K2O

P2O5

H2O*

H2OCO2

SO3

TOTAL

ORIGINAL

ANALYSIS

71.20

.25

11.60

1.54

2.33

.14

.04

.43

6.20

5.15

0.00

.69

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.57

WATER-C02-FREE

(100.0)

72.01

.25

11.73

1.56

2.36

.14

.04

.43

6.27

5.21

0.00

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

33.26

.15

6.14

1.08

1.81

.11

.02

.31

4.60

4.28

0.00

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.02

.07

4.80

.41

.69

.04

.02

.16

4.23

2.31

0.00

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

WEIGHT NORM

(100.0)

23.75

0.00

30.87

31.29

0.00

0.00

0.00

4.52

3.90

1.92

0.00

3.27

0.00

0.00

0.00

.48

0.00

0.00

0.00

0.00

.03

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

24.53

0.00

30,96

31.39

0.00

0.00

0.00

0.00

5.11

1.93

0.00

5.60

0.00

0.00

0,00

.48

0,00

0,00

0.00

0,00

.02

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

357

3 4.

16.

2.

46.

0.

107

3-COMPONENT

WT.PERCENTS

F 25.36

24.73

2.75

72.52

52.63

43.72

3.65

1284

SODIC RHYOLITE

13.48N 40.30E«

H. TA2IEFF ET AL.

DALAF1LA,

• 1969

OF ALU SUMMIT. N. AFAR

SI02

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K2U

P205

H20*

H20-

C02

S03

TOTAL

OKIGINAL

ANALYSIS

71.22

.47

13.11

1.13

2.52

.14

.45

1.61

5.77

2.75

.10

.58

.09

0.00

0.00

0.00

0.00

0.00

0.00

99.94

WATER-C02-FREE

(100.0)

71.74

.47

13.21

1.14

2.54

.14

.45

1.62

5.81

2.77

.10

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

33.27

.28

6.94

.79

1.96

.11

.27

1.15

4.28

2.28

.04

.01

.00

0.00

0.00

AToMS

NUMBERS (100.0)

24.79

.12

5.38

.30

.73

.04

.23

.60

3.90

1.22

.03

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

WEIGHT NORM

(100.0)

2 = .O5

0.00

16.42

49.31

1.69

0.00

0.00

0.00

0.00

4.95

0.00

1.81

0.00

1.66

0.00

.90

0.00

0.00

.22

0.00

.32

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

21.89

0.00

16.45

49.42

1.70

0.00

0.00

0.00

0.00

5.04

0.00

4.38

0.00

0.00

0.00

.90

0.00

0.00

.22

0.00

.20

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

346

37

IB

8

35

1

103

3-COMPONENT

WT.PERCENTS

F 28.92

M 3.57

A 67.51

26.49

11.68

61.83

56.96

27.15

15.89
1285

PANTELLERITE

12.58N 40.15E,

H. TAZIEFF tT AL.

9KM S.E. OF GAR-ULI. N. AFAR

I 1969

SIO2

TIO2

AL2O3

FE203

FEO

MNO

MGO

CAO

NA2O

K2G

P2O5

H2U+

H2OCOi

SO3

TOTAL

ORIGINAL

ANALYSIS

71.30

.21

11.20

1.19

2.76

.13

.07

.99

6.20

4.35

.05

1.22

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.67

WATER-C02-FREE

(100.0)

72.42

.21

11.38

1.21

2.80

.13

.07

1.01

6.30

4.42

.05

SI

TI

AL

FE3

FE2

MN

Mi

CA

NA

tc

P

H*

HC

S

0

ATOMS

WEIGHT

33.31

.13

5.93

.83

2.15

.10

.04

.71

4.60

3.61

.02

.01

0.00

0.00

0.00

48.23

ATOMS

NUMBERS (100.0)

25.15

.06

4.66

.32

.82

.04

.04

.37

4.24

1.96

.01

62.34

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO*FEO

IN FEMICS =

WEIGHT NORM

(100.0)

25.09

0.00

26.19

33.88

0.00

0.00

0.00

3.51

3.62

4.17

0.00

3.03

0.00

0.00

0.00

.41

o.oo 0.00

.11

0.00

.04

NON-OX I OAT I ON NORM

(FE203 CONVERTED TO FEO)

25.70

0.00

26.25

33.96

0.00

0.00

0.00

0.00

4.56

4.19

0.00

4.83

0.00

0.00

0.00

.41

0.00

0.00

.11

0.00

.03

SI

AL

FM

C

ALK

358

33.

17.

3-COMPONENT

WT.PERCENTS

F 27.11

25.50

6.39

68.11

53.73

37.69

8.58

No. 1285

REMARKS: See under 1284.

No. 1286

REMARKS: See under 1284.

No. 1287

MINERALOGY: Phenocrysts: An79, olivine Fal4,

clinopyroxene. Groundmass: Plagioclase, olivine,

clinopyroxene, magnetite; zeolites.
1286

SODIC RHYOLlTE

13.48N 40.30E<

H. TAZIEFF ET AL.

DALAFILA,

i 1969

OF ALU SUMMIT. N. AFAR

SIO2

TIO2

AL2O3

FE203

FEO

UNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

S03

TOTAL

ORIGINAL

ANALYSIS

71.60

.42

11.50

1.00

2.45

.16

.42

1.44

6.10

3.15

.08

1.04

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.36

WATER-C02-FREE

(100.0)

72.82

.43

11.70

1.02

2.49

.16

.43

1.46

6.20

3.20

.08

SI

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

33.45

.25

6.08

.70

1.90

.12

.25

1.03

4.53

2.61

.03

.01

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.17

.11

4.76

.26

.72

.06

.22

.54

4.16

1.41

.02

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO»FEO

IN FEMICS =

WEIGHT NORM

(100.0)

25.05

0.00

18.99

42.31

0.00

0.00

0.00

2.95

1.62

5.88

0.00

2.22

0.00

0.00

0.00

.81

0.00

0.00

.18

0.00

.25

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

25.56

0.00

19.02

42.39

0.00

0.00

0.00

0.00

2.41

5.93

0.00

3.70

0.00

0.00

0.00

.81

0.00

0.00

.18

0.00

.20

SI

AL

FM

C

ALK

361

34.2

18.0

7.B

40.0

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 26.30

M 3.20

A 70.50

F 24.40

C 10.18

A 65.42

N 57.06

K 29.47

C 13.47

1287

OLlVlNE BASALT

12.48N 44.116, 1ML N. OF SIR HltfAYRlB, J. KHARIZt S. YEMEN

I.G.GASS AND D.I.J.MALLICK, 1968

S102

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

44.91

1.99

15.26

5.22

5.64

.15

8.57

10.46

2.19

.56

.24

1.00

.91

2.90

0.00

0.00

0.00

0.00

0.00

100.00

WATER-C02-FREE

(100.0)

47.18

2.09

16.03

5.48

5.92

.16

9.00

10.99

2.30

.59

.25

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

HEIGHT

20.98

1.19

8.07

3.65

4.38

.12

5.17

7.48

1.62

.46

.10

.01

.01

.79

0.00

ATOMS

NUMBERS (100.0)

17.27

.58

6.92

1.51

1.82

.05

4.92

4.31

1.63

.27

.08

Q

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO*FEO

IN FEMICS =

WEIGHT NORM

(100.0)

2.33

0.00

3.38

18.93

30.71

0.00

0.00

0.00

0.00

1.68

0.00

24.12

0.00

7.73

0.00

3.85

0.00

0.00

.54

6.74

.90

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

3.42

19.12

31.03

0.00

0.00

0.00

0.00

1.75

0.00

24.45

8.99

0.00

0.00

3.89

0.00

0.00

.54

6.81

.65

NIGGLI

SI

AL

FM

C

ALK

101

20

48

25

5

C/FM

OZ

3-COMPONENT

WT.PERCENTS

F 48.96

M 36.64

A 12.40

F 45.12

C 43.46

A 11.43

N 16.5«

K 4.24

C 79.18
1288

O H VINE BASALT

12.48N 44.11E» JEBEL KHARIZ« SOUTH YEMEN

1.G.6ASS AND D.I.J.MALLICK. 1968

S102

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAU

NA2O

<2O

P2O5

H2O*

H2OCO2

SO3

TOTAL

ORIGINAL

ANALYSIS

45.21

3.28

15.63

6.47

7.86

.21

5.29

9.48

2.98

.75

.34

1.44

.83

.23

0.00

0.00

0.00

0.00

0.00

100.00

WATER-C02-FREE

(100.0)

46.37

3.36

16.03

6.64

8.06

.22

5.43

9.72

3.06

.77

.35

Si

TI

AL

FE3

FE2

MM

MG

CA

NA

K

P

H*

HC

S

0

ATOMS

WEIGHT

21.12

1.97

8.27

4.53

6.11

.16

3.19

6.78

2.21

.62

.15

.02

.01

.06

0.00

44.81

ATOMS

NUMBERS (100.0)

17.24

.94

7.03

1.86

2.51

.07

3.01

3.88

2.20

.37

.11

60.78

D

CB

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

WEIGHT NORM

(100.0)

0.00

0.00

4.54

25.85

27.65

0.00

0.00

0.00

0.00

13.63

0.00

10.73

.32

9.62

0.00

6.37

0.00

0.00

.76

.54

.81

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

4.60

25.15

28.00

.56

0.00

0.00

0.00

14.45

0.00

0.00

19.47

0.00

0.00

6.45

0.00

0.00

.77

.54

.48

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

UZ

107

21.U

46.*;

24.1

8.U

.14

.40

5.a

.34

.52

-25

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K.

C

D.I.

61.37

22.66

15.97

52.03

34.42

13.54

22.56

5.68

71.76

73.04

No. 1288

MINERALOGY: Phenocrysts: An80-71, olivine Fal6.

Groundmass: An59, Fa24, clinopyroxene, magnetite,

haematite, serpentine, calcite.

No. 1289

MINERALOGY: Phenocrysts: Olivine Fal4. Groundmass: An70-60, olivine, clinopyroxene, magnetite,

biotite, calcite.

No. 1290

MINERALOGY: Not given.
1289

OLlVlNE BASALT

12.48N 44.1IE.

I.G.GAS5 AND D.I.

S.W. FLANKf JEBE L ICHARIZ. 50UTH YEMEN

J.MALLICK, 1968

SIU2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H20-

CO2

SO3

TOTAL

ORIGINAL

ANALYSIS

46.00

1.95

16.17

4.16

6.17

.16

9.00

9.92

2.97

• 99

.74

1.49

.22

0.00

0.00

0.00

0.00

0.00

0.00

99.94

WATER-C02-FREE

(100.0)

46.83

1.99

16.46

4.23

6.28

.16

9.16

10.10

3.02

1.01

.75

SI

Tl

AL

Ft3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

21.49

1.17

8.56

2.91

4.80

• 12

5.43

7.09

2.20

.82

.32

.02

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

17.07

.54

7.07

1.16

1.92

.05

4.99

3.95

2.14

.47

.23

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

ccMGO/MGO*FEO

IN FEMICS =

WEIGHT NORM

(100.0)

0.00

0.00

5.97

24.31

28.33

.71

0.00

0.00

0.00

13.86

0.00

0.00

15.24

6.15

0.00

3.77

0.00

0.00

1.65

0.00

.86

NON-OX I DAT ION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

6.02

19.59

28.56

3.38

0.00

0.00

0.00

14.35

0.00

0.00

22.64

0.00

0.00

3.80

0.00

0.00

1.66

0.00

.67

3-COMPONENT

WT.PERCENTS

F 44.35

C/FM

OZ

1290

OLlVlNE BASALT

12.48N 44.11E. S.E. FLANK, JEbEL KHARIZ> SOUTH YEMEN

I.G.GASS AND D.I.J.MALLICK. 1968

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OCO2

SO3

ORIGINAL

ANALYSIS

48.00

3.31

15.70

6.52

5.60

.22

4.30

10.00

3.76

1.05

.91

1.43

.18

0.00

0.00

0.00

0.00

0.00

0.00

100.98

I»ATER-CO2-FREE

48.30

3.33

15.80

6.56

5.64

.22

4.33

10.06

3.78

1.06

.92

(100.0)

SI

TI

AL

FE3

Ft2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

22.43

1.98

8.31

4.56

4.35

.17

2.59

7.15

2.79

.87

.40

.02

.00

0.00

0.00

ATOMS

NUhBfcRS (100.0)

17.79

.92

6.86

1.82

1.74

.07

2.38

3.97

2.70

.50

.29

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

WEIGHT NORM

(100.0)

1.07

0.00

6.26

32.08

22.96

0.00

0.00

0.00

0.00

16.88

0.00

2.98

0.00

9.27

• IB

6.32

•0.00

0.00

2.00

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

6.34

29.25

23.25

1.75

0.00

0.00

0.00

18.37

0.00

0.00

12.61

0.00

0.00

6.40

0.00

0.00

2.03

0.00

.49

SI

AL

FM

C

ALK

K

MG

Tl

P

C/FM

OZ

118

22.b

40.0

26.5

10.7

.16

.40

6.1

.95

.66

-24

3-COMPONENT

NT.PERCfcNTS

57.09

20.25

22.66

45.01

37.13

17.86

25.39

7.09

67.52
1291

OLIVINE BASALT

12.48N 44.11E.

I.O.GASS AND O.I.

S.fc. FLANK, JEBE L KHARIZ. SOUTH YEMEN

.MALLICK, 1968

SIU2

TIO2

AL2O3

FE203

FEO

MNO

MGU

CAO

NA20

K2O

P2O5

H20*

H20-

C02

SO3

TOTAL

ORIGINAL

ANALYSIS

48.00

2.14

16.75

4.17

6.63

.19

5.58

9.40

4.25

.77

.77

.78

.14

0.00

0.00

0.00

0.00

0.00

0.00

99.57

WATER-C02-FHEE

(100.0)

46.66

2.17

16.98

4.23

6.72

.19

5.66

9.53

4.31

.78

.78

SI

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

H+

HC

S

0

ATOMS

WEIGHT

22.43

1.28

8.86

2.92

5.15

.15

3.37

6.72

3.15

.64

.34

.01

.00

0.00

0.00

44.56

ATOMS

NUMBERS (100.0)

17.74

.60

7.30

1.16

2.05

.06

3.08

3.72

3.05

.36

.24

60.64

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FfcO

IN FEMC S =

WEIGHT NORM

(100.0)

0.00

0.00

4.62

33.17

24.64

1.82

0.00

0.00

0.00

14.60

0.00

0.00

9.18

6.14

0.00

4.12

0.00

0.00

1.71

0.00

.77

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

4.66

28.53

24.84

4.49

0.00

0.00

0.00

15.18

0.00

0.00

16.43

0.00

0.00

4.15

0.00

0.00

1.72

o.oo

.55

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

115

23.6

41.2

24.2

11.1

.11

.48

3.9

.78

.59

-29

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

D.I.

50.47

26.07

23.46

42.82

37.27

19.90

29.47

5.34

65.19

65.93

No. 1291

MINERALOGY: Phenocrysts: An66-53, olivine Fa32,

clinopyroxene, magnetite. Groundmass: Plagioclase,

clinopyroxene, magnetite.

No. 1292

MINERALOGY: (General description for the Jebel Umm

Birka trachy-basalts). Phenocrysts: Subhedral

plagioclase forming up to 25% of rock (zoned labradoriteandesine), small pale-brown clinopyroxene, sometimes

subhedral magnetite, Fal6-40. Groundmass: Plagioclase laths (An6l-48) with zoning out to more sodic

composition; interstitial magnetite, clinopyroxene,

olivine (or iddingsite); sometimes brown glass, alkali

feldspar, apatite, zeolite.

No. 1293

MINERALOGY: See under 1292.
1292

BASALT

12.46N 44.25E. RAS GHAwA, SOUTH YEMEN

I.G.GASS AND D.I.J.MALLICK, 1968

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H2O +

H2OCO2

SO3

TOTAL

ORIGINAL

ANALYSIS

49.48

2.72

16.76

5.92

5.28

.19

3.60

9.29

3.74

1.19

.62

.54

.67

0.00

0.00

0.00

0.00

0.00

0.00

100.00

WATER-C02-FREE

(100.0)

50.09

2.75

16.97

5.99

5.34

.19

3.64

9.40

3.79

SI

TI

AL

F£3

FE.2

MN

MG

CA

NA

ATOMS

WEIGHT

23.12

1.63

8.87

4.14

4.10

.15

2.17

6.64

2.77

ATOMS

NUMBERS (100.0)

18.32

.76

7.31

1.65

1.64

.06

1.99

3.69

2.69

0.00

0.00

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO.FEO

IN FEMICS =

WEIGHT NORM

(100.0)

2.73

0.00

7.13

32.10

25.70

0.00

0.00

0.00

0.00

13.62

0.00

3.41

0.00

8.71

0.00

5.22

0.00

0.00

1.37

0.00

.95

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

0.00

0.00

7.22

32.47

25.99

0.00

0.00

0.00

0.00

14.77

0.00

2.27

10.61

0.00

0.00

5.29

0.00

0.00

1.39

0.00

.45

C/FM

OZ

3-COMPONENT

wT.PERCENTS

F 56.77

M 18.25

A 24.99

F 44.0b

C 36.55

A 19.39

N 26.30

K 8.37

C 65.33

1293

BASALT

12.48N 44.20E. JEBEL SUMIRAH, SOUTH YEMEN

I.G.GASS AND D.I.J.MALLICK, 1968

SI02

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K2U

P205

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

51.56

3.02

15.78

2.64

7.86

.23

3.22

7.69

4.33

1.20

.09

.15

• 32

1.91

0.00

0.00

0.00

0.00

0.00

100.00

WATER-COZ-FREE

52.82

3.09

16.16

2.70

8.05

.24

3.30

7.88

4.44

1.23

.09

(100.0)

SI

TI

AL

FE3

Ft2

MN

MG

CA

NA

<

P

H*

HC

S

ATOMS

WEIGHT

24.09

1.81

8.35

1.85

6.11

.18

1.94

5.50

3.21

1.00

.04

.00

.00

.52

0.00

ATOMS

NUMBERS (100.0)

19.24

.85

6.94

.74

2.46

.07

1.79

3.08

3.13

.57

.03

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

WEIGHT NORM

(100.0)

3.49

0.00

7.14

36.89

20.13

0.00

0.00

0.00

0.00

4.62

0.00

13.54

0.00

3.85

0.00

5.76

0.00

0.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

.69

0.00

7.18

37.08

20.23

0.00

0.00

0.00

0.00

4.74

0.00

19.70

0.00

0.00

0.00

5.79

0.00

0.00

AP

CC

MGO/MGO+FEO

Irt FEMICS =

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

143

25.7

37.6

22.9

13. b

.15

.35

6.3

.11

.61

-12

3-COMPONENT

WT

F

M

A

F

C

A

N

K

C

.PERCENTS

54.55

16.73

28.73

44.27

32.42

23.31

32.75

9.08

58.17
1294

MICROcJABBRO (INTRUSIVE)

12.48N 44.22E. CENTRAL TO^ER.

l.G.GASS AND O.I.J.MALLICK. 1968

J. KHARIZ « SOUTH YEMEN

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2U

P2O5

H2O*

H2OCO2

SO3

TOTAL

0

CB

OR

AS

AN

NE

LC

AC

N5

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO*FEO

IN FEhlCS =

ORIGINAL

ANALYSIS

53.00

1.87

17.25

1.89

7.04

.18

3.05

7.43

4.60

1.85

.60

1.16

.45

0.00

0.00

0.00

0.00

0.00

0.00

100.37

WEIGHT NORM

(100.0)

0.00

0.00

11.10

39.50

21.17

0.00

0.00

0.00

o.oo

10.52

0.00

6.60

3.41

2.78

0.00

3.59

0.00

0.00

1.33

0.00

.54

t»ATER-C02-FREE

(100.0)

53.67

1.89

17.47

1.91

7.13

.18

3.09

7.52

4.66

1.87

.61

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

O.OO

11.14

39.64

21.24

0.00

0.00

0.00

0.00

10.71

0.00

2.82

9.51

0.00

0.00

3.61

0.00

0.00

1.33

0.00

.43

SI

TI

AL

FE3

FE2

MN

Mb

CA

NA

K

P

H+

HC

S

0

ATOMS

WEIGHT

24.76

1.12

9.13

1.32

5.47

.14

1.84

5.31

3.41

1.54

.26

.01

.01

0.00

0.00

46.05

NIGGLl

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

ATOMS

NUMBERS

19.37

.51

7.43

.52

2.16

.06

1.66

2.91

3.26

.86

.19

61.07

148

28.4

33.6

22.3

15.8

.«! 1

.38

3.9

.71

.66

-15

(100.0)

3-COMPONENT

MT,

F

M

A

F

C

A

N

K

C

D.I.

.PERCENTS

48.45

16.55

35.00

39.15

32.57

28.28

33.14

13.33

53.53

74.54

No. 1294

MINERALOGY: Phenocrysts: Large subhedral plagioclase, zoned both progressively and oscillatory between

An63-18, often with albitic rims. Groundmass:

Colourless pyroxene, serpentinised olivine, magnetite,

accessory albite, alkali feldspar-quartz intergrowths.

No. 1295

MINERALOGY: See under 1296.

No. 1296

MINERALOGY: Sub-trachytic texture. Phenocrysts:

An38-29, clinopyroxene, magnetite. Groundmass:

Plagioclase, clinopyroxene, magnetite, alkali feldspar

(interstitial), apatite.
1295

TRACHYANDESITE

12.48N 44.22E.

J.G.GA5S AND O.I.

CENTRAL TOwER. J,

J.MALLICK, 1968

<HARI2. SOUTH YEMEN

S102

TIO2

AL2O3

FE203

FEO

MNO

MGO

CAO

NA2O

K20

P2O5

H2O*

H2OCO2

SO3

ORIGINAL

ANALYSIS

53.00

2.15

U.13

8.58

2.36

.30

2.01

6.67

5.41

1.98

.85

1.76

• 73

0.00

0.00

0.00

0.00

0.00

0.00

99.93

WATER-C02-FREE

(100.0)

54.39

2.21

14.50

8.81

2.42

.31

2.06

6.85

5.55

2.03

.87

SI

TI

AL

FE3

FE2

m

MG

CA

NA

K.

P

H*

HC

S

ATOMS

WEIGHT

24.76

1.29

7.48

6.00

1.83

.23

1.21

4.77

4.01

1.64

• 37

.02

• 01

0.00

0.00

ATOMS

NUMBERS (100.0)

19.73

.60

6.20

2.41

.74

.09

1.12

2.66

3.91

.94

.27

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO*FEO

IN FEMICS =

WEIGHT NORM

(100.0)

3.00

0.00

12.04

47.08

8.58

0.00

0.00

0.00

0.00

11.11

2.53

0.00

0.00

2.44

7.14

4.19

0.00

0.00

1.91

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

12.24

45.74

8.73

1.16

0.00

0.00

0.00

17.69

0.00

0.00

8.25

0.00

0.00

4.26

0.00

0.00

1.94

0.00

.32

C/FM

QZ

3-COMPONENT

WT.PERCENTS

F 53.79

43.7b

26.6b

29.56

c

D.I .

38.48

14.08

47.44

1296

TRACHYANDESITE

12.48N 44.11E. JEBEL KHARIZ. SOUTH YEMEN

I.G.GASS AND D.I.J.MALLICK. 1968

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

503

TOTAL

ORIGINAL

ANALYSIS

56.00

1.79

14.85

8.33

2.04

.21

2.63

4.19

5.50

2.67

.65

.86

.86

0.00

0.00

0.00

0.00

0.00

0.00

100.58

WATER-C02-FREE

56.65

1.81

15.02

8.43

2.06

.21

2.66

4.24

5.56

2.70

.66

(100.0)

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

26.16

1.07

7.86

5.83

1.59

.16

1.59

2.99

4.08

2.22

.28

.01

.01

0.00

o.oo

ATOMS

NUMBERS (100.0)

20.34

.49

6.36

2.28

.62

.06

1.43

1.63

3.88

1.24

.20

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MG0*FE0

IN FEMICS =

WEIGHT NORM

(100.0)

4.38

0.00

16.00

47.18

7.97

0.00

0.00

0.00

0.00

7.19

0.00

3.31

0.00

2.11

6.99

3.44

0.00

0.00

1.44

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

16.26

47.95

8.10

0.00

0.00

0.00

0.00

7.96

0.00

9.05

5.72

0.00

0.00

3.49

0.00

0.00

1.46

0.00

.39

173

27. 0

37.3

13.9

21.8

.24

p

C/FM

QZ -14

.85

.37

3-COMPONENT

WT.PERCENTS

F 48.98

M 12.42

A 38.59

F 45.62

C 18.43

A 35.94

N 44.50

K 21.60

C 33.90
1297

TRACHYTE

12.48N 44.HE , 3ML E. OF FORT UMAyRAH,

I.G.3ASS AND D.I.J.MALLICK. 1966

J. KHARIZ. SOUTH YEMEN

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

<2O

P2O5

H2O+

H2OCO2

SO3

TOTAL

ORIGINAL

ANALYSIS

63.00

1.05

14.45

3.35

4.76

.29

.57

2.78

5.39

3.13

.25

1.42

0.00

0.00

0.00

0.00

0.00

0.00

0.00

100.44

WATER-C02-FREE

(100.0)

63.62

1.06

14.59

3.38

4.81

.29

.58

2.81

5.44

3.16

.25

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H+

HC

s

0

ATOMS

WEIGHT

29.43

.63

7.65

2.34

3.70

.22

.34

1.99

4.00

2.60

.11

.02

0.00

0.00

0.00

47.41

ATOMS

NUMBERS (100.0)

22.58

.28

6.10

• 91

1.43

.09

.30

1.07

3.75

1.43

.08

61.98

0

CB

OR

AB

AN

NE

LC

AC

NS

01

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEU

IN FEMICS =

WEIGHT NORM

(100.0)

12.65

0.00

18.73

46.17

5.98

0.00

0.00

0.00

0.00

5.59

0.00

3.40

0.00

4.92

0.00

2.01

0.00

0.00

.55

0.00

.28

NON-OXIDATION NORM

(FE203 CONVEKTED TO FEO)

9.13

0.00

18.85

46.47

6.02

0.00

0.00

0.00

0.00

5.74

0.00

11.21

0.00

0.00

0.00

2.03

0.00

0.00

.56

0.00

.13

NIGGLI

SI

AL

FM

C

ALK

K

Ma

TI

P

C/FM

OZ

239

32

28

11

27

3

29

3-COMPONENT

WT.PERCENTS

F 47.15

M 3.31

A 49.53

F 41.78

C 14.32

A 43.89

C

D.I .

47.70

27.70

24.60

No. 1297

MINERALOGY: Phenocrysts: Oligoclase-andesine,

magnetite, pale-green augite. Groundmass: Trachytic

texture; albite-oligoclase; scarce magnetite, serpentine

(after olivine), apatite.

No. 1298

MINERALOGY: Medium-grained, equigranular. Groundmass: Mode: 70% alkali feldspar (anorthoclase); 5%

oligoclase (An27); 10% quartz; 15% green clinopyroxene,

sodic amphibole, magnetite. Femic minerals may be

complexly zoned, with pyroxene and amphibole occurring in the same crystal, and showing end-stage alkali

enrichment.

No. 1299

MINERALOGY: Not given.
1298

QUARTZ MlcROSYENITE (INTRUSIVE)

12.48N 44.11E, 1KM E. OF CENTRAL TOwER,

I.G.GASS AND D.I.J.MALLICK, 1968

J. tCHARlz, SOUTH YEMEN

SIO2

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OCOZ

S03

TOTAL

ORIGINAL

ANALYSIS

63.40

.96

14.15

5.47

3.24

.28

.32

1.49

6.36

3.59

.20

.95

.32

0.00

0.00

0.00

0.00

0.00

0.00

100.73

WATER-C02-FREE

(100.0)

63.74

.97

14.23

5.50

3.26

.28

.32

1.50

6.39

3.61

.20

SI

TI

AL

FE3

FE2

MN

M6

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

29.62

.58

7.49

3.83

2.52

.22

.19

1.06

4.72

2.98

.09

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

22.59

.26

5.94

1.47

.97

.08

.17

.57

4.40

1.63

.06

0

CB

OH

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

If* FEMICS =

WEIGHT NORM

(100.0)

10.69

0.00

21.39

53.05

0.00

0.00

0.00

1.04

0.00

2.99

1.10

0.00

0.00

7.47

0.00

1.83

0.00

0.00

• 44

0.00

.61

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

5.48

0.00

21.61

53.62

0.00

0.00

0.00

0.00

.28

5.59

0.00

11.12

0.00

0.00

0.00

1.85

0.00

0.00

.44

0.00

.07

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

244

32.1

29.1

6.2

32.6

.2

.0

2.a

.3

.2

15

3-COMPOUENT

WT.PERCENTS

F 45.89

43.23

7.39

49.38

55.59

31.3b

13.02

1299

TRACHYTE AGGLOMERATE

12.48N 44.11Et CALDERA. JEBEL KHARIZ. SOUTH YEMEN

I.G.GASS AND D.I.J.MALLICK, 1968

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

PZ05

H20*

HZOC02

S03

TOTAL

ORIGINAL

ANALYSIS

65.00

1.06

13.05

5.80

2.07

.23

1.15

2.31

5.40

3.27

.15

• 39

.47

0.00

0.00

0.00

0.00

0.00

0.00

100.35

WATER-C02-FREE

65.33

1.07

13.12

5.83

2.08

.23

1.16

2.32

5.43

3.29

.15

(100.0)

SI

TI

AL

Ft3

FEZ

MN

Mb

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

30.37

.64

6.90

4.06

1.61

.18

.69

1.65

4.01

2.71

.07

.00

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

23.08

.28

5.46

1.55

.62

.07

.61

• 88

3.72

1.48

.05

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

wtlGHT NORM

(100.0)

16.63

0.00

19.47

46.04

1.65

0.00

U.00

0.00

0.00

6.23

.42

0.00

0.00

4.39

2.82

2.02

0.00

0.00

.33

0.00

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

11.66

0.00

19.69

46.55

1.67

0.00

0.00

0.00

0.00

7.87

0.00

10.17

0.00

0.00

0.00

2.05

0.00

0.00

.33

0.00

.25

SI

AL

FM

C

ALK

K.

MG

TI

P

C/FM

QZ

254

30.1

31.4

9.7

28.7

.2

,1

3.1

.2

.3

39

3-COMPONENT

WT.PE.HCENTS

F 44.49

M 6.50

A 49.01

F 41.75

C 12.25

A 45.99

N 49.1U

K 29.78

C 21.04
1300

QUARTZ TRACHYTfc

12.48N 44.20E.

I.G.GASS AND D.I.

JEBE L SUMIRAH, SOUTH YEMEN

J.MALLICK, 1968

SI02

TI02

AL2O3

FE2O3

FEO

mo

MGO

CAO

NA20

K2O

P2O5

H20 +

H2QC02

S03

F

CL

TOTAL

ORIGINAL

ANALYSIS

66.87

.45

13.02

3.85

1.07

.18

.24

4.12

4.79

3.51

.10

.09

1.04

.54

0.00

.08

.05

0.00

0.00

100.00

WATER-C02-FREE

(100.0)

68.10

.46

13.26

3.92

1.09

.18

.24

4.20

4.88

3.57

.10

SI

TI

AL

FE3

FE2

HN

MG

CA

NA

K

P

H*

HC

S

0

ATOMS

WEIGHT

31.24

.27

6.89

2.69

.83

.14

.14

2.94

3.55

2.91

.04

.00

.01

.15

0.00

48.04

ATuMS

NUMBERS (100.0)

23.88

.12

5.46

1.04

.32

.05

.13

1.58

3.32

1.60

.03

62.46

0

CB

OR

AB

AN

NE

LC

AC

NS

01

MO

HY

OL

MT

HM

1L

TI

RU

AP

CC

MGO/MGO*FEO

IN FEMICS =

WEIGHT NORM

(100.0)

20.99

0.00

21.06

41.15

3.64

0.00

0.00

0.00

0.00

1.31

4.75

0.00

0.00

2.78

1.99

.87

0.00

0.00

.22

1.25

1.00

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

17.75

0.00

21.22

41.46

3.67

0.00

0.00

0.00

0.00

11.58

0.00

1.97

0.00

0.00

0.00

.87

0.00

0.00

.22

1.26

.10

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

287

32.9

18.5

19.0

29.6

.3

.0

1.5

.1

1.0

68

3-COMPONENT

WT.PERCENTS

F 36.55

28.37

23.76

47.87

38.57

28.26

33.17

No. 1300

MINERALOGY: Phenocrysts: Anorthoclase, divine Fa94,

sodic ferro-hedenbergite, magnetite. Groundmass:

Same minerals as phenocrysts, plus quartz.

No. 1301

MINERALOGY: Phenocrysts: Euhedral anorthoclase,

bright-green sodic ferro-hedenbergite. Groundmass:

Very fine-grained quartz, alkali feldspar, small needles

green clinopyroxene, accessory haematite, sodic

amphibole (cossyrite?).

No. 1302

MINERALOGY: See under 1300.
1301

RHYOLITE

12.48N 44.UE , 2ML ESE OF BlR HIWAYRlB,

I.G.GASS AND D.I.J.MALLICK, 1968

J. KHARIz* SOUTH YEMEN

SI02

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K20

P205

M20*

H20-

C02

SO 3

TOTAL

ORIGINAL

ANALYSIS

67.00

.49

13.56

3.90

2.30

.29

.31

1.91

5.71

3.05

.08

1.10

.33

0.00

0.00

0.00

0.00

0.00

0.00

100.03

WATER-C02-FREE

(100.0)

67.95

.50

13.75

3.96

2.33

.29

.31

1.94

5.79

3.09

.08

SI

TI

AL

FE3

Ft2

MN

MG

CA

NA

K

P

H*

HC

s

ATOMS

WEIGHT

31.30

.29

7.17

2.73

1.79

.22

.19

1.37

4.24

2.53

.03

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

23.78

.13

5.67

1.04

.66

.09

.16

.73

3.93

1.38

.02

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

WLIGH T NORM

1100.0)

18.97

0.00

18.33

49.12

2.32

0.00

0.00

0.00

0.00

3.10

1.29

0.00

0.00

5.75

0.00

.94

0.00

0.00

.18

0.00

NON-OX1DAT ION NORM

(FE2O3 CONVERTED TO FEO)

14.90

0.00

18.47

49.50

2.34

0.00

0.00

0.00

0.00

6.07

0.00

7.59

0.00

0.00

0.00

• 95

0.00

0.00

.18

0.00

MGO/MGO*FEO

IN FEMICS =

C

ALK

3-COMPONENT

WT.PERCENTS

F 40.60

M 2.03

A 57.37

F 36.75

C 11.32

A 51.93

N 53.51

K 28.58

C 17.90

1302

QUARTZ TRACHYTE

12.48N 44.22t, 150M N. OF J. UMM BlRKA SUMMIT, SOUTH YEMEN

I.G.GASS AND D.I.J.MALLICK, 1968

S102

TI02

AL203

FE203

FEO

MHO

MGG

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

F

CL

TOTAL

ORIGINAL

ANALYSIS

67.34

.63

12.49

4.83

1.60

.22

.66

2.68

4.93

3.17

.09

.27

.90

0.00

0.00

.09

.10

0.00

0.00

100.00

WATER-C02-FREE

(100.0)

68.27

.64

12.66

4.90

1.62

.22

.67

2.72

5.00

3.21

.09

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

31.46

.38

6.61

3.38

1.24

.17

.40

1.92

3.66

2.63

.04

.00

.01

0.00

0.00

ATUMS

NUMBERS (100.0)

23.96

.17

5.24

1.30

.48

.07

.3b

1.02

3.40

1.44

.03

Q

CB

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

WEIGHT NORM

(100.0)

22.38

0.00

19.04

4 2.39

2.56

3.00

).00

J.00

).00

S.61

.42

.00

j.oo

,.12

.07

.21

).00

).00

.20

0.00

1 00

NON-OX I DAT I ON NORM

(FE203 CONVERTED TO FEO)

18.16

0.00

19.22

42.79

2.58

0.00

0.00

0.00

0.00

9.16

0.00

6.66

0.00

0.00

0.00

1.22

0.00

0.00

.20

0.00

.19

NIGGLl

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

UZ

290

31.7

26.5

12.4

29.4

.30

.16

2.0

.16

.47

72

3-COMPONENT

WT.PERCENTS

F 42.33

M 4.34

A 53.32

F 37.36

C 15.57

A 47.07

N 45.73

K 29.41

C 24.86
1303

COMENoITE

12.48N 44.11E, JEBEL KHARI2. SOUTH YEMEN

I.G.GASS AND D.I.J.MALLICK, 1968

5102

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

F

CL

TOTAL

ORIGINAL

ANALYSIS

68.33

.45

11.65

4.64

.08

.23

.33

2.40

4.69

3.06

.10

.22

.97

2.59

0.00

.02

.04

0.00

0.00

100.00

WATER-C02-FREE

71.06

.47

12.12

5.03

.08

.24

.34

2.50

4.88

3.18

.10

(100.0)

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

M*

HC

s

0

ATOMS

WEIGHT

31.92

.27

6.16

3.39

.06

.18

.20

1.72

3.48

2.54

.04

.00

.01

.71

0.00

49.26

ATOMS

NUMBERS (100.0)

24.75

.12

4.97

1.32

.02

.07

.18

.93

3.30

1.42

.03

62.89

C02 EXCESS

0

CB

OR

AB

AN

NE

LC

AC

MS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

.80

WEIGHT NORM

(100.0)

29.09

.61

18.38

40.33

0.00

0.00

0.00

0.00

0.00

0.00

U.00

.84

0.00

0.00

4.92

.67

0.00

.00

.22

4.14

1.00

.80

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

26.05

.61

18.54

40.67

0.00

0.00

0.00

0.00

0.00

0.00

0.00

8.05

0.00

0.00

0.00

.87

0.00

0.00

.22

4.17

.13

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

335

33.7

21.6

12.7

32.0

.3

.1

1.7

.5

107

3-COMPONENT

WT.PERCENTS

F 37.85

32.65

15.93

51.43

46.21

30.15

23.65

NO. 1303

MINERALOGY: Phenocrysts: Common anorthoclase,

rare sodic ferro-hedenbergite, rare fayalitic olivine,

magnetite. Groundmass: Quartz, feldspar, sodic

pyroxene, magnetite, sodic amphibole (riebeckite);

accessory fluorite, zircon, devitrified glass.

No. 1304

MINERALOGY: See under 1301. Phenocrysts:

Additional cossyrite.

No. 1305

MINERALOGY: See under 1301.
1304

RHYOUTE

12.48N 44.11E. JEBEL KHARIZt SOUTH YEMEN

I.G.GASS AND O.I.J.MALLICK. 1968

SIU2

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

F

CL

TOTAL

ORIGINAL

ANALYSIS

70.38

.53

7.56

7.14

.83

.29

.31

.76

4.11

3.58

.05

2.66

1.47

0.00

0.00

.14

.19

0.00

0.00

100.00

WATER-C02-FREE

(100.0)

73.67

.55

7.91

7.47

.87

.30

.32

• 80

4.30

3.75

.05

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

HEIGHT

32.88

.32

4.00

4.99

.65

.22

.19

.54

3.05

2.97

.02

.03

.02

0.00

0.00

ATOMS

NUMBERS (100.0)

25.90

.15

3.28

1.98

.26

.09

.17

.30

2.93

1.68

.02

HEIGHT NORM

(100,0)

36.70

0.00

22.20

19.80

0.00

0.00

1.75

.59

0.00

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMIC5 =

0.00

2.19

.90

1.05

0.00

0.00

.11

0.00

1.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

37.32

0.00

22.53

20.09

0.00

0.00

0.00

0.00

3.94

3.27

0.00

11.67

0.00

0.00

0.00

1.07

0.00

0.00

.12

0.00

.08

MG

TI

P

C/FM

OZ

.07

2.2

.12

.12

176

3-COrtPONENT

WT.PERCENTS

F 49.91

M 1.94

A 48.15

F 48.54

48.64

42.37

8.99

1305

RHYOLITE

12.48N 44.11E«

I.G.GASS AND D.I.

JEBE L *HARIZ» SOUTH YEMEN

J.MALLICK, 1968

SI 02

TI02

AL2O3

FE203

FEO

MNO

MGo

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

71.00

.29

8.60

4.31

4.83

.31

0.00

.95

4.56

4.33

.64

.10

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.92

WATER-C02-FREE

(100.0)

71.13

.29

8.62

4.32

4.84

• 31

0.00

• 95

4.57

4.34

.64

SI

TI

AL

FE3

F6.2

MM

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

33.17

.17

4.55

3.01

3.75

.24

0.00

.68

3.38

3.59

.28

.00

0.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.23

.08

3.60

1.15

1.44

.09

0.00

.36

3.14

1.96

.19

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO*FEO

IN FEMIC5 =

WEIGHT NORM

(100.0)

29.26

0.00

25.70

20.12

0.00

0.00

0.00

12.53

1.03

.85

0.00

6.55

0.00

0.00

0.00

.55

o.oo 0.00

1.40

0.00

0.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

31.48

0.00

25.92

20.29

0.00

0.00

0.00

0.00

4.37

.86

0.00

15.11

0.00

0.00

0.00

.56

0.00

0.00

1.41

0.00

0.00

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

340

24.

36.

34!

0.

1.

1.

133

3-COMPONENT

WT.PERCENTS

F 50.69

M 0.00

A 49.31

F 48.16

C 5.01

A 46.84

N 46.34

K 44.00
1306

COMENDITE DYKE

12.48N 44.22E, SUMMIT JEBEL UMM BlRlCA. SOUTH YEMEN

I.G.GA5S AND O.I.J.MALLICK, 1968

SI02

TI02

AL203

FE203

FEO

MNO

MGO

CAu

NA20

K20

P2O5

H2U*

H20-

C02

S03

f

TOTAL

ORIGINAL

ANALYSIS

71.54

.19

13.39

.38

2.76

• 11

.18

.98

5.23

4.09

.04

• 35

.50

0.00

0.00

.17

.09

0.00

0.00

100.00

*ATER-C02-FREE

(100.0)

72.34

.19

13.54

.38

2.79

.11

.18

.99

5.29

4.14

.04

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

33.42

.11

7.08

.27

2.15

.09

.11

.70

3.88

3.40

.02

.00

.01

0.00

0.00

48.51

ATOMS

NUMBERS (100.0)

25.01

.05

5.52

.10

.81

.03

.09

.37

3.55

1.83

.01

62.64

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

WEIGHT NORM

(100.0)

21.95

0.00

24.51

44.87

.92

0.00

0.00

0.00

0.00

3.32

0.00

3.42

0.00

.56

0.00

.36

0.00

0.00

.09

0.00

.11

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

21.56

0.00

24.53

44.90

.92

0.00

0.00

0.00

0.00

3.33

0.00

4.31

0.00

0.00

0.00

.37

0.00

0.00

.09

0.00

.10

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

365

40.

15.

5.

39.

108

3-COMPONENT

WT.PERCENTS

F 24.84

50.7B

39.71

9.51

No. 1306

MINERALOGY: Similar to 1303.

No. 1307

MINERALOGY: See under 1301.

No. 1308

MINERALOGY: Similar to 1303.
1307

RHY0L1TE

12.48N 44.HE ,

I.G.GASS AND O.I.

N. MARQI N CALDERA<

•MALLICK, 1968

J. KHARIz, SOUTH YEMEN

SI02

TI02

AL2O3

FE2O3

FEO

MNO

H60

CAO

NA20

K2O

P2O5

H2O*

H2OCO2

SO 3

TOTAL

ORIGINAL

ANALYSIS

72.00

.51

9.00

7.17

1.57

.29

0.00

.90

5.05

3.14

.04

• 92

• 24

0.00

0.00

0.00

0.00

0.00

0.00

100.83

WATER-C02-FREE

(100.0)

72.24

.51

9.03

7.19

1.58

.29

0.00

.90

5.07

3.15

.04

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

Ht

HC

S

ATOMS

WEIGHT

33.64

.31

4.76

5.01

1.22

.22

0.00

.64

3.75

2.61

.02

.01

.00

0.00

0.00

ATOMS

NUMBERS (100.0)

25.42

.14

3.74

1.91

.46

.09

0.00

.34

3.46

1.42

.01

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

M60/MG0*FE0

IN FEMICS =

WEIGHT NORM

(100.0)

32.77

0.00

18.67

28.88

0.00

0.00

0.00

12.42

0.00

.35

1.61

0.00

0.00

4.23

0.00

.97

0.00

0.00

.09

0.00

0.00

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

32.08

0.00

18.93

29.28

0.00

0.00

0.00

0.00

3.33

3.85

0.00

11.46

0.00

0.00

0.00

.99

0.00

0.00

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

357

26.3

34.6

4.8

34.3

.i.

0.0

1.9

.0

.1

144

3-COMPONENT

WT.PERCENTS

F 51.62

M 0.00

A 48.3B

F 49.02

C 5.05

A 45.93

N 55.5b

K 34.54

C 9.90

1308

COMENQlTE

12.48N 44.22E<

I.G.GASS AND D.I.

100M S. OF J. UMM BlRKA SUMMIT. SOUTH YEMEN

J.MALLICK. 1968

SIU2

TI02

AL2O3

FE203

FEO

MNO

MGo

CAO

NA20

K20

P2O5

H2U*

H20-

C02

S03

F

CL.

TOTAL

ORIGINAL

ANALYSIS

73.28

.35

11.52

2.64

1.77

• 15

.23

1.07

4.46

3.46

0.00

.72

.72

0.00

0.00

0.00

.13

0.00

0.00

100.50

WATER-C02-FREE

74.07

.35

11.64

2.67

1.79

.15

.23

1.08

4.51

3.50

0.00

(100.0)

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

34.24

.21

6.10

1.85

1.38

.12

.14

.76

3.31

2.87

0.00

.01

.01

0.00

0.00

ATOMS

NUMBERS (100.0)

25.66

.09

4.75

.70

.52

.04

.12

.40

3.03

1.55

0.00

0

CB

OR

AB

AN

NE

LC

AC

NS

Dl

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS =

HEIGHT NORM

(100.0)

32.20

0.00

20.73

38.25

1.14

0.00

0.00

0.00

0.00

2.72

.41

0.00

0.00

3.88

0.00

.67

0.00

0.00

0.00

0.00

.49-

NON-OX IDATIUN NORM

(FE203 CONVERTED TO FEO)

29.53

0.00

20.83

38.44

1.15

0.00

0.00

0.00

0.00

3.75

0.00

5.62

0.00

0.00

0.00

.68

0.00

0.00

0.00

0.00

.10

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

at

397

36.8

21.4

6.2

35.5

.34

.09

1.4

0.00

.29

155

3-COMPONENT

WT.PERCENTS

F 35.11

M 1.83

A 63.06

F 32.91

49.61

38.49

11.90
1309

ANDESITE (OVERLYING 1310)

12.54N 39.01E. EMNI NEGARIT PASS,

E. ABBATE ET AL.» 1969

5102

TIO2

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MQO/MGOFEO

IN FEMICS =

ORIGINAL

ANALYSIS

52.59

3.03

13.60

2.53

9.37

.18

4.25

7.85

3.75

.66

.38

1.10

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.49

WEIGHT NORM

(100.0)

5.08

0.00

3.97

32.32

19.14

0.00

0.00

0.00

0.00

15.10

0.00

13.96

0.00

3.74

0.00

5.84

0.00

0.00

.84

0.00

.57

WATER-C02-FREE

(100.0)

53.45

3.08

14.03

2.57

9.52

.18

4.32

7.98

3.81

.67

.39

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

2.38

0.00

3.99

32.48

19.24

0.00

0.00

0.00

0.00

15.40

0.00

19.79

0.00

0.00

0.00

5.87

0.00

0.00

.85

0.00

.46

SI

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

24.57

1.82

7.30

1.77

7.28

.14

2.56

5.61

2.78

.55

.17

.01

0.00

0.00

0.00

44.93

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

ATOMS

NUMBERS

19.55

.85

6.05

.71

2.92

.06

2.36

3.13

2.70

.31

.12

61.25

142

22.0

44.1

22.8

11.0

.10

.39

6.2

.44

.52

-2

(100.0)

3-COMPONENT

WT,

F

M

A

F

C

A

N

K

C

D.I.

.PERCENTS

57.88

20.67

21.45

49.25

32.49

18.25

30.59

5.38

64.03

73.68

No. 1309

REMARKS: Analysis made on powder dried at 110°C.

MINERALOGY: Weakly porphyritic. Phenocrysts:

Zoned An45 (center) - An60 (rim), augite (2 V = +50°),

hypersthene (En68). Groundmass: Hyalopilitic structure with sparse microlites of An64-67, rare pyroxene,

common magnetite.

No. 1310

REMARKS: See under 1309.

MINERALOGY: Weakly porphyritic. Phenocrysts:

Zoned An58 (center) - An62 (rim), augite (2V = +50°).

Groundmass: Interstitial An62 microlites, augite,

skeletal magnetite, rare ilmenite, brown glass; some

euhedral serpentinised Fa20.

No. 1311

REMARKS: SiO, determined to three significant

figures. Sample dried at 105"C prior to analysis.

P O5 less than 0.05%. Published summation is 99.90%.

MINERALOGY: Aphyric glass.
1310

PORPHYRITIC BASALT (UNDERLYING 1309)

12.54N 39.01E< EMM NEGARIT PASSi TIGRAY

E. ABBATE ET AL.i 1969

SIO2

TI02

AL203

FE203

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

49.95

1.56

12.81

3.70

7.4*

.17

9.15

10.45

2.34

.25

.22

1.45

0.00

0.00

0.00

0.00

0.00

0.00

0.00

99.49

WATER-C02-FREE

50.95

1.59

13.07

3.77

7.59

.17

9.33

10.66

2.39

.25

.22

(100.0)

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

23.34

• 94

6.78

2.59

5.78

.13

5.52

7.47

1.74

.21

.10

.02

0.00

0.00

0.00

44.89

ATOMS

NUMBERS (100.0)

18.59

.44

5.62

1.04

2.32

.05

5.08

4.17

1.69

.12

.07

60.81

0

CB

OR

A6

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO*FEO

IN FEMICS =

WEIGHT NORM

(100.0)

1.79

0.00

1.51

20.23

24.16

0.00

0.00

0.00

0.00

22.10

0.00

21.21

0.00

5.48

0.00

3.02

0.00

0.00

.49

0.00

.78

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

1.52

20.38

24.34

0.00

0.00

0.00

0.00

22.71

0.00

21.51

6.01

0.00

0.00

3.04

0.00

0.00

.49

0.00

.64

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

113

17.1

51.9

25.5

5.5

.07

.60

2.7

.21

.49

-9

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

O.I.

48.69

39,99

11.32

46.07

43.22

10.71

17.94

1.92

80.14

54.90

APHYRIC PANTELLERITIC OBSIDIAN

7.12N 38.30E, CHABBI EAST CENTRE.

R. MACDONALD AND I.L. GIBSON. 1970

5102

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

503

TOTAL

ORIGINAL

ANALYSIS

74.40

.35

9.42

1.77

2.88

.22

.16

.20

5.33

4.29

0.00

.47

0.00

0.00

0.00

.25

.16

.25

-.15

100.00

WATER

75.14

.35

9.51

1.79

2.91

.22

.16

.20

5.38

4.33

0.00

-C02-FREE

(100.0)

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

34.76

.21

4.98

1.24

2.24

.17

.10

.14

3.95

3.56

0.00

.01

0.00

0.00

0.00

48.13

ATOMS

NUMBERS (100.0)

26,09

.09

3.89

.47

.65

.07

.08

.08

3.63

1.92

0.00

62.84

0

CB

OR

AB

AN

NE

LC

AC

NS

01

WO

HV

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO*FEO

IN FEMICS =

WEIGHT NORM

(100.0)

34.19

0.00

25.68

24.77

0.00

0.00

0.00

5.19

3.49

.89

0.00

5.12

0.00

0.00

0.00

.67

0.00

0.00

0.00

0.00

• 09

NON-OX1 DAT ION NORM

(FE203 CONVERTED TO FEO)

35.12

0.00

25.77

24.86

0.00

0.00

0,00

0.00

4.88

.89

0.00

7.81

0.00

0.00

0.00

.67

0.00

0.00

0.00

0.00

.06

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

416

31.1

23.4

1.2

44.3

.35

.06

1.5

0.00

.05

178

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

D.I.

32.22

l.U

66.67

32.14

1.3H

66.48

54.28

43.69

2.04

96.67
1312

APHYRIC PANTELLERITIC OBSIDIAN

7.14N 38.28E. CHABBI NORTHEAST CENTRE.

R. MACDONALD AND I.L. GIBSON, 1970

SI02

T102

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

PC 2 0

P205

H20+

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

74.40

.27

9.41

1.65

2.90

.21

• 13

.24

5.49

4.39

0.00

.41

0.00

0.00

0.00

.25

.16

.25

-.15

100.01

WATER-C02-FREE

(100.0)

75.08

.27

9.50

1.67

2.93

.21

.13

.24

5.54

4.43

0.00

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

0

ATOMS

WEIGHT

34,76

.16

4.98

1.15

2.25

.16

.08

.17

4.07

3.64

0.00

.00

0.00

0.00

0.00

48.06

ATOMS

NUMBERS (100.0)

26,07

.07

3.89

,44

.85

.06

.07

.09

3.73

1.96

0,00

62.77

Q

CB

OR

AB

AN

NE

LC

AC

NS

DI

MO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGOtFEO

IN FEMICS =

WEIGHT NORM

(100.0)

34.05

0.00

26.26

24.14

0.00

0.00

0.00

4.83

4.05

1.06

0.00

5.10

0.00

0.00

0.00

.52

0.00

0.00

0.00

0.00

.07

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

34.91

0.00

26.34

24.21

0.00

0.00

0.00

0.00

5.34

1.07

0.00

7.60

0.00

0.00

0.00

.52

0,00

0.00

0.00

0.00

.05

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

413

30.8

22.5

1.4

45.2

.34

.05

1.1

0.00

.06

175

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

D.I.

31.25

.89

67,86

31.02

1.64

67.35

54,25

43.38

2.37

97.22

No. 1312

REMARKS: See under 1311. SiO2 quoted as "by

difference" (this would seem to apply more appropriately

to 1311 with its 100.00 summation and its identical SiO_

content).

MINERALOGY: Same as 1311.

No. 1313

REMARKS: See under 1311.

MINERALOGY: Same as 1311.

No. 1314

REMARKS: See under 1311.

MINERALOGY: Same as 1311.
1313

APHYRIC PANTELLERITIC OBSIDIAN

7.13N 38.28E. CHABBI HOT CONE, ARUSSI

R. MACDONALD AND I.L. GIBSON, 1970

SI02

TIO2

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H20*

H2OCO2

SO3

TOTAL

ORIGINAL

ANALYSIS

74.20

.27

9.40

1.74

2.90

.21

.15

• 21

$.23

4.26

0.00

.40

0.00

0.00

0.00

• 24

.16

.25

-.14

99.48

WATER-C02-FREE

(100.0)

75.28

.27

9.54

1.77

2.94

.21

.15

.21

5.31

4.32

0.00

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H»

HC

s

0

ATOMS

WEIGHT

34,67

.16

4.97

1.22

2.25

.16

.09

.15

3.88

3.54

0.00

.00

0.00

0.00

0.00

47.87

ATOMS

NUMBERS (100.0)

26.14

.07

3.90

.46

.86

.06

.08

.08

3.57

1.92

0.00

62.86

0

CB

OR

AB

AN

NE

LC

AC

NS

01

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGOFEO

IN FEMICS «

WEIGHT NORM

(100.0)

34.29

0.00

25.61

24.95

0.00

0.00

0.00

5.12

3.32

.94

0.00

5.25

0.00

0.00

0.00

.52

0.00

0.00

0.00

0.00

.09

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

35.21

0.00

25,70

25.03

0.00

0.00

0.00

0.00

4.69

.94

0.00

7,90

0.00

0.00

0.00

.52

0.00

0.00

0.00

0.00

.06

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

418

31.3

23.4

1.3

44.1

.35

.05

1.1

0.00

.05

180

3-C0MP0NENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

D.I.

32.49

1.05

66.46

32.36

1.46

66.18

53,92

43.92

2.16

96.87

1314

APHYRIC PANTEU.ERITIC OBSIDIAN

7.12N 38.27E* CHABBI HOT CONEi ARUSSI

R. MACDONALD AND I.L. GIBSON, 1970

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

503

TOTAL

ORIGINAL

ANALYSIS

74.30

• 26

9.35

1.28

3.34

.22

.20

.20

5.66

4,44

0.00

.32

0.00

0.00

0.00

.25

.17

.25

-.15

100.09

WATER-C02-FREE

(100.0)

74.86

.26

9.42

1.29

3.37

.22

.20

.20

5,70

4,47

0.00

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

0

ATOMS

WEIGHT

34.71

.16

4.95

.90

2.60

.17

.12

.14

4.20

3.69

0.00

.00

0.00

0.00

0.00

47.94

ATOMS

NUMBERS (100.0)

26.01

.07

3.86

.34

.98

.07

.10

.08

3.84

1.98

0,00

62,67

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO'FEO

IN FEMICS «

WEIGHT NORM

(100.0)

33.84

0.00

26.51

23.51

0.00

0.00

0.00

3.74

4.80

.88

0.00

6.21

0.00

0.00

0.00

,50

0,00

0,00

0.00

0.00

.10

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

34.51

0.00

26.58

23.56

0.00

0,00

0.00

0.00

5.80

.89

0.00

8.15

0.00

0.00

0.00

.50

0.00

0.00

0.00

0.00

.08

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

405

30.1

23.2

1.2

45.5

.34

.07

1.1

0.00

.05

169

3-COMPONENT

WT.PERCENTS

F 30.97

M 1.34

A 67.69

F 30.97

C 1.34

A 67.69

N 54,95

K 43.11

C 1.94
1315

APHYRIC PANTELLERITIC OBSIDIAN

7.12N 36.27E. CHABB1 MAIN CENTRE,

R. MACDONALD AND I.L. GIBSON. 1970

SI02

TIO2

M.2O3

FE203

FEO

MNO

MGO

CAO

NA2O

K2O

P2O5

H2O*

H2OC02

SO3

TOTAL

ORIGINAL

ANALYSIS

74.30

.27

9.44

1.61

2.82

.21

.12

.28

5.29

4.39

0.00

.36

0.00

0.00

0.00

.23

.16

• 25

-.14

99.59

WATER-C02-FREE

(100.0)

75.26

.27

9.56

1.63

2.86

.21

.12

.28

5.36

4.45

0.00

SI

TI

M.

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

34.71

.16

4,99

1.13

2.19

.16

.07

.20

3.92

3.64

0.00

.00

0.00

0.00

0.00

47.89

ATOMS

NUMBERS (100.0)

26.12

.07

3.91

.43

.83

,06

.06

.11

3.61

1.97

0.00

62.83

Q

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO*FE0

IN FEMICS =

WEIGHT NORM

(100.0)

34.26

0.00

26.35

24.38

0.00

0.00

0.00

4.73

3.66

1.25

0.00

4.85

0.00

0.00

0.00

.52

0.00

0.00

0.00

0.00

.07

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

35.11

0.00

26.44

24.46

0.00

0.00

0.00

0.00

4.92

1.25

0.00

7.30

0.00

0.00

0.00

.52

0.00

0.00

0.00

0.00

.05

SI

AL

FM

c

ALK

K

MG

TI

P

C/FM

QZ

418

31.4

22.2

1.7

44.8

.35

.05

1.1

0.00

.08

179

3-COMPONENT

WT.PERCENTS

F 31.13

30,79

1.95

67.27

53.11

44.08

2.81

No. 1315

REMARKS: See under 1311.

MINERALOGY: Same as 1311.

No. 1316

REMARKS: See under 1311.

MINERALOGY: Same as 1311.

No. 1317

REMARKS: See under 1311.

MINERALOGY: Same as 1311.
1316

APHYRIC PANTELLERITIC OBSIDIAN

7.12N 38.27E. CHABBI HOT CONEi ARUSSI

R. MACDONALD AND I.L. GIBSON, 1970

SI02

TI02

AL2O3

FEZ03

FEO

MNO

MGO

CAO

NA20

K2O

P2O5

H2O*

H2OCO2

503

TOTAL

ORIGINAL

ANALY5IS

74.30

.27

9.48

1.79

2.90

.20

• 16

.18

5.52

4.48

0.00

.31

0.00

0.00

0.00

.23

.16

.25

-.14

100.09

WATER-C02-FREE

74.84

.27

9.55

1.80

2.92

.20

.16

.18

5,56

4.51

0.00

(100.0)

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

0

ATOMS

WEIGHT

34,71

.16

5.02

1.25

2.25

.15

.10

.13

4,10

3.72

0.00

.00

0.00

0.00

0.00

48.00

ATOMS

NUMBERS (100.0)

26.00

.07

3.91

.47

.B5

.06

,08

,07

3.75

2.00

0.00

62.73

0

CB

OR

AB

AN

NE

LC

AC

NS

01

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO*FEO

IN FEMICS -

WEIGHT NORM

(100.0)

33.45

0.00

26.74

23.95

0.00

0.00

0.00

5.23

4.02

.80

0.00

5.29

0.00

0.00

0.00

.52

0.00

0.00

0.00

0.00

.09

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

34.39

0.00

26.84

24.03

0.00

0.00

0.00

0.00

5.42

.80

0.00

8.00

0,00

0.00

0.00

.52

0.00

0,00

0.00

0.00

.06

NlGGLI

SI

AL

FM

C

ALK

K

C/FM

OZ

408

30.7

23.0

1.1

45.2

.35

.06

1.1

0.00

.05

171

3.COMPONENT

WT.PERCENTS

F 31.58

M 1.08

A 67.34

D.I.

31.54

1.21

67.25

54.22

44.01

1.77

1317

APHYRIC PANTELLERITIC OBSIDIAN

7.13N 38.31E, CHABBI EAST CENTRE,

R. MACDONALD AND I.L. GIBSON. 1970

SI02

TI02

AL2O3

FE203

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

73.80

.26

9.54

1.73

2.97

.23

.19

.23

5.62

4.43

0.00

.49

0.00

0.00

0.00

.25

.17

.25

-.15

100.01

WATER-C02-FREE

(100.0)

74.55

.26

9.64

1.75

3.00

.23

.19

.23

5.68

4.47

0,00

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

34.48

.16

5.05

1.21

2.31

.18

.11

.16

4.17

3.68

0.00

.01

0.00

0.00

0.00

47.98

ATOMS

NUMBERS (100.0)

25.91

.07

3.95

.46

,87

,07

.10

.09

3.83

1.99

0.00

62.68

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGOtFEO

IN FEMICS e

WEIGHT NORM

(100.0)

32.68

0.00

26.52

24.61

0.00

0.00

0.00

5.07

4.14

1.02

0.00

5.47

0.00

0,00

0,00

,50

0.00

0,00

0,00

0.00

.10

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

33.58

0.00

26.61

24.69

0.00

0.00

0.00

0.00

5.50

1.02

0.00

8.09

0.00

0.00

0.00

.50

0.00

0.00

0.00

0.00

.07

NlGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

QZ

400

30.5

23.2

1.3

45.0

.34

.07

1.1

0.00

.06

163

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

D.I.

31.46

1.27

67.27

31.38

1.54

67.09

54.67

43.09

2.24

96.11
1318

APHYRIC PANTELLERITIC OBSIDIAN

7.15N 38.28E. CHABBI NORTH CENTRE.

R. MACOONALD AND I.L. GIBSON, 1970

SI02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

74,00

.27

9.46

1.91

2.65

.21

.23

.25

5.42

4.41

0.00

.30

0.00

0.00

0.00

.25

.16

.25

-.15

99.62

WATER-C02-FREE

74.89

.27

9.57

1.93

2.68

.21

.23

.25

5.49

4.46

0.00

(100.0)

SI

TI

AL

FES

FE2

MN

MG

CA

NA

K

P

H*

HC

s

0

ATOMS

WEIGHT

34.57

.16

5.01

1.34

2.06

.16

.14

.18

4.02

3.66

0.00

.00

0.00

0.00

0.00

47,81

ATOMS

NUMBERS (100.0)

26.01

.07

3.92

.51

.78

.06

.12

.09

3.70

1.98

0.00

62.77

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MG0*FE0

IN FEMICS *

WEIGHT NORM

(100.0)

33.40

0.00

26.45

24.35

0.00

0.00

0.00

5.61

3.68

1.10

0.00

4.B9

0.00

0.00

0.00

• 52

0.00

0.00

0.00

0.00

.14

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

34.40

0.00

26,55

24.44

0.00

0.00

0.00

0.00

5.18

1,11

0.00

7.79

0.00

0.00

0.00

.52

0.00

0.00

0.00

0.00

.09

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

408

30.8

23.1

1.5

44.6

.35

.08

1.1

0,00

.06

171

3-COMPONENT

WT.PERCENTS

F 31.19

M 1.57

A 67.24

31.15

1.71

67.14

53.77

43.75

2.48

No. 1318

REMARKS: See under 1311.

MINERALOGY: Same as 1311.

No. 1319

REMARKS: See under 1311.

MINERALOGY: Same as 1311.

No. 1320

REMARKS: See under 1311.

MINERALOGY: Same as 1311.
1319

APHYRIC PANTELLERITIC OBSIDIAN

7.U N 38.29E. CHA8B1 MAIN CENTRE.

R, MACDONALD AND I.L. GIBSON. 1970

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

74.10

.29

9.62

1.76

2.84

.22

.20

.20

5.53

4.37

0.00

.29

0.00

0.00

0.00

.25

.16

.24

-.15

99.92

WATER-C02-FREE

74.75

.29

9.70

1.78

2.86

.22

.20

.20

5.58

4.41

0.00

(100.0)

SI

Tl

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

0

ATOMS

WEIGHT

34.62

.17

5.09

1.23

2.21

.17

.12

.14

4.10

3.63

0.00

.00

0.00

0.00

0.00

47.93

ATOMS

NUMBERS (100.0)

25.96

.08

3.97

.46

.83

.07

.10

.08

3.76

1.95

0.00

62.74

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS «

WEIGHT NORM

(100.0)

32.95

0.00

26.13

25.33

0.00

0.00

0.00

5.15

3.76

.88

0.00

5.24

0.00

0.00

0.00

.56

0.00

0.00

0.00

0.00

.11

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

33.87

0.00

26.22

25.42

0.00

0.00

0.00

0.00

5.14

.89

0.00

7.91

0.00

0.00

0.00

.56

0.00

0.00

0.00

0.00

.08

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

406

31.1

23.0

1.2

44.8

.34

.07

1.2

0.00

.05

168

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

O.I.

31.29

1.36

67.35

31.29

1.36

67.35

54.75

43.27

1.98

95.83

1320

APHYRIC PANTELLERITIC OBSIDIAN

7.U N 38.29E. CHABB1 EAST CENTRE,

R. MACDONALD AND I.L. GIBSON. 1970

SI02

TI02

AL203

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P205

H20*

H20-

C02

S03

TOTAL

ORIGINAL

ANALYSIS

74.90

.27

9.46

1.53

2.87

.22

.17

.20

5.49

4.47

0.00

.40

0.00

0.00

0.00

.25

.16

• 24

-.15

100.48

WATER-C02-FREE

75,22

.27

9.50

1.54

2.88

.22

.17

.20

5.51

4.49

0.00

(100.0)

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H +

HC

s

0

ATOMS

WEIGHT

34,99

.16

5.01

1.07

2.23

.17

.10

.14

4.07

3.71

0.00

.00

0.00

0.00

0.00

48.31

ATOMS

NUMBERS (100.0)

26.10

.07

3.89

.40

,84

.07

.09

,07

3,71

1.99

0.00

62.77

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMICS «

WEIGHT NORM

(100.0)

34.32

0.00

26.60

23.83

0.00

0.00

0.00

4.46

4.16

.88

0.00

5.23

0.00

0.00

0.00

.51

0.00

0.00

0.00

0.00

.10

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

35.12

0.00

26.68

23.90

0.00

0.00

0.00

0.00

5.36

.89

0.00

7.54

0.00

0.00

0.00

.52

0.00

0.00

0.00

0.00

.07

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

416

31.0

22.2

1.2

45.6

.35

.06

1.1

0.00

.05

177

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

D.I.

30.28

1.17

68.55

30,22

1.37

68.41

54,04

44.00

1.97

96.28
1321

APHYRIC PANTELLERITIC OBSIDIAN

7.UN 38.31E. CHABBI EAST CENTRE.

R. MACDONALD AND I.L. GIBSON. 1970

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

ORIGINAL

ANALYSIS

74.80

.28

9.69

1.61

2.92

.22

.14

.30

5.53

4.38

0.00

.37

0.00

0.00

0.00

.24

.16

.25

-.14

100.75

WATER-C02-FREE

(100.0)

74.90

.28

9,70

1.61

2.92

.22

.14

• 30

5.54

4.39

0.00

SI

TI

AL

FE3

FE2

MN

MG

CA

ATOMS

WEIGHT

34.95

.17

5.13

1.13

2.27

.17

.08

.21

4.10

3.64

0.00

.00

0.00

0.00

0.00

48.39

ATOMS

NUMBERS (100.0)

26.00

.07

3.97

.42

.85

.06

.07

.11

3.73

1.94

0.00

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MG0/MG0*FEO

IN FEMICS *

WEIGHT NORM

(100.0)

33.27

0.00

25.99

25.45

0.00

0.00

0.00

4.68

3.77

1.32

0.00

4.98

0.00

0.00

O.OO

.53

0.00

0.00

0.00

0.00

.08

NON-OXIDATION NORM

(FE203 CONVERTED TO FEO)

34.U

0.00

26.07

25.53

0.00

0.00

0.00

0.00

5.03

1.33

0.00

7.41

0.00

0.00

0.00

.53

0.00

0.00

0.00

0.00

.06

SI

AL

FM

c

ALK

K

C/FM

OZ

409

31.3

22.2

1.8

44.7

.34

.05

1.2

0.00

.08

171

3-COMPONENT

WT.PERCENTS

F 31.07

M .96

A 67,97

30.73

2.04

67.23

54.16

42.90

2.94

No. 1321

REMARKS: See under 1311.

MINERALOGY: Same as 1311.

No. 1322

MINERALOGY: Fine-grained rock. Phenocrysts:

Occasional clusters of large, oscillatory-zoned labradorite laths intergrown with colourless augite;

numerous microphenocrysts of serpentinised olivine.

Groundmass: Fresh labradorite (sometimes zoned

to oligoclase), intergranular colourless augite and

iron-ore, interstitial pale-brown glassy mesostasis.

OTHER INFORMATION: 1-1/2 - 2 m wide dyke cutting

alkali olivine basalt lavas of the early Miocene Simien

center.
1322

OLIVINE THOLEIITE DYKE

13.UN 38.21E. DEJEN COL. 5IMIEN.

M.J. LEBAS AND P.A. MOHR. 1970

SI02

TI02

AL2O3

FE2O3

FEO

MNO

MGO

CAO

NA20

K20

P2O5

H20*

H20-

C02

S03

ORIGINAL

ANALYSIS

50.38

1.71

14.92

1.91

9.63

.16

5.34

10.65

2.81

.53

. 1 7

1.1 7

.56

.13

0.00

0.00

0.00

0.00

0.00

100.07

WATER-C02-FREE

51.30

1.74

15.19

1.94

9.81

.16

5.44

10.84

2.86

.54

.17

(100.0)

SI

TI

AL

FE3

FE2

MN

MG

CA

NA

K

P

H*

HC

S

ATOMS

WEIGHT

23.54

1.03

7.89

1.34

7.49

.12

3.22

7.61

2.08

.44

.07

.01

.01

.04

0.00

ATOMS

NUMBERS (100.0)

18.83

.48

6.57

.54

3.01

.05

2,98

4.27

2.04

.25

.05

45.18 60.93

0

CB

OR

AB

AN

NE

LC

AC

NS

DI

WO

HY

OL

MT

HM

IL

TI

RU

AP

CC

MGO/MGO+FEO

IN FEMJCS *

WEIGHT NORM

(100.0)

.98

0.00

3.19

24.23

26.95

0.00

0.00

0.00

0.00

20.73

0.00

17.12

0.00

2.82

0.00

3.30

0.00

0.00

.38

.30

.56

NON-OXIDATION NORM

(FE2O3 CONVERTED TO FEO)

0.00

0.00

3.20

24.32

27.05

0.00

0.00

0.00

0.00

21.01

0.00

17.34

3.09

0.00

0.00

3.31

0.00

0.00

.38

.30

.49

NIGGLI

SI

AL

FM

C

ALK

K

MG

TI

P

C/FM

OZ

123

21.5

43.1

27.9

7.5

.11

.4$

3.1

.16

.65

-7

3-COMPONENT

WT.PERCENTS

F

M

A

F

C

A

N

K

C

D.I.

57.07

26.41

16,52

45.20

41.72

13.08

20.09

3.79

76.13

68.36

* U. S. GOVERNMENT PRINTING OFFICE : 1970 O - 397-772