bluuebunny/crossref_metadata_2025 huggingface dataset:
Revised stratigraphy and sedimentology of the Paleoproterozoic Dubawnt Supergroup at the northern margin of Baker Lake Basin, Nunavut
Authors: Rainbird R H , Hadlari T
Published: November 2010

On the northwest side of the Paleoproterozoic Baker Lake basin the Christopher Island Formation, comprising volcanic flows intercalated with alluvial fan and pyroclastic rocks, unconformably overlies Archean gneiss. It is unconformably overlain by the Amarook
Formation (new name), a well indurated sandstone characterized by large-scale crossbedding of probable eolian origin, and interbedded alluvial sandstone and conglomerate. The Amarook Formation correlates with similar strata recognized in drill core and outcrop from the eastern Thelon Basin. The
disconformably overlying Pitz Formation includes lower volcanic and upper sedimentary members. The upper member correlates with strata mapped as basal Thelon Formation in the Thelon Basin.
Lower Dubawnt Supergroup rocks are offset by a series of northwest-striking dextral faults that may predate deposition of the overlying Barrensland Group. A possible strike-parallel fault may be responsible for repetition of lower Dubawnt strata in the southern part of the study
area.
Lithogeochemical studies in the Uchi Confederation greenstone belt, northwestern Ontario: implications for Archean tectonics
Authors: Rogers N , McNicoll V , van Staal C R , Tomlinson K
Y
Published: November 2010

The Uchi-Confederation greenstone belt consists of three volcanic units that span over 250 million years (2989-2735 Ma) that have previously been termed the Balmer, Woman, and Confederation assemblages. Recent geochemical data indicate that the ca. 2840 Ma rocks
of the Woman assemblage may be absent from this greenstone belt. The western portion of the group previously interpreted as the Woman assemblage are actually ca. 2880 Ma basaltic volcanic rocks, referred to herein as the Narrow Lake assemblage, whereas the eastern portion is probably part of the
Confederation assemblage. Structural and geochronological studies indicate that the volcanic strata formed in situ rather than having been juxtaposed tectonically.
The distribution, structure, and geochemistry of units within the Confederation assemblage (ca. 2740 Ma) indicate that it formed as a rifted arc. However the tectonic settings of the older volcanic units are ambiguous.
Lithostratigraphic revision of the Upper Cambrian Cairnside Formation, upper Potsdam Group, southwestern Quebec
Authors: Salad Hersi O , Lavoie D
Published: November 2010

The contact between the Covey Hill and overlying Cairnside formations (Potsdam Group) is exposed in the Ducharme quarry near the village of Covey Hill. It is the first time that the contact is identified from a surface section. The upper part of Covey Hill
observed below this contact is characterized by a thick- to medium-bedded, light- and medium-grey, coarse-grained, pebbly subarkose lithofacies. The Cairnside Formation consists of a lower unit of thickly bedded to medium-bedded, coarse-grained, burrowed, white quartz arenite and an upper unit
characterized by beds similar to those of the lower unit with thinly bedded to lenticular, medium-grey, coarse-grained dolomitic sandstone. The upper contact of the Cairnside Formation is recognized from a core, and is placed at the top of the highest clean quartz arenite above which such
lithofacies does not exist or is extremely subordinate relative to the dolomitic sandstone and sandy dolostone interbeds of the overlying Theresa Formation.
World distribution of porphyry, porphyry-associated skarn, and bulk-tonnage epithermal deposits and occurrences
Authors: Kirkham R V , Dunne K P E
Published: November 2010

The global distribution of a broad class of large, low- to medium-grade mineral deposits in which primary ore minerals are mainly structurally controlled, and which are spatially and genetically related to felsic to intermediate porphyritic intrusions, is
represented in this data set. Variations of this class include large stockwork and vein deposits directly connected to the intrusions (porphyry deposits), porphyry-associated replacement deposits in a predominantly calc-silicate, formerly carbonate-rich sedimentary rock hosts (skarn deposits), and
large precious metal (+/- base metal) deposits that are removed from but associated with porphyry deposits (epithermal deposits). Porphyry and porphyry-associated deposits are the world's most important source of copper, molybdenum, and rhenium, and are major sources of gold, silver, and tin; other
byproduct metals include tungsten, platinum, palladium, and selenium. This database was converted for update into the World Minerals Geoscience Database format.
Stratigraphy of Lower and Middle Devonian carbonate rocks of northeastern British Columbia
Authors: Nadjiwon L N , Morrow D W , Coniglio M
Published: November 2010

Devonian carbonate rocks of northeastern British Columbia overlie the "sub-Devonian unconformity" and pass upward to shale of the Besa River Formation. Lowermost of these carbonate rocks is the thick Muncho-McConnell Formation shallow marine carbonate rocks. In
the northern part of the study area the Wokkpash Formation, a dolomitic, quartz arenite sandstone displaying soft-sediment deformation, separates the Muncho-McConnell from the overlying Stone Formation, but in the south the Wokkpash is absent. The thick, uniformly grey and bluish-grey dolomite units
of the Stone Formation display fenestral fabric, mud-chip breccias, and finely laminated beds. The gas-bearing Dunedin, Keg River, and Slave Point formations, overlying the Stone Formation in outcrop, are dominantly micritic to fine-grained fossiliferous marine limestone. Transitions from off-reef
to reefal in these strata are accompanied by an increase in fossil abundance and size, and increased dolomitization. Several different breccia types are found within the Dunedin and Stone formations associated with dolomitization.
Geochemistry and Nd isotopes of granitoid rocks in the Shikag-Garden lakes area, Ontario: recycled Mesoarchean crust in the central Wabigoon Subprovince
Authors: Tomlinson K Y , Percival J A
Published: November 2010

Neoarchean granitoid rocks from the Shikag-Garden lakes area of the central Wabigoon Subprovince were analyzed to examine the role of recycling of older crust in their petrogenesis. The eNd values calculated at 2.7 Ga range from +1.2 to -6.9 with Nd model ages
ranging from 2.80-3.97 Ga. Isotopic modelling calculations suggest that most of the rocks have incorporated older material with a predominant ca. 3.4 Ga component. These data suggest similarities with the Winnipeg River Subprovince, remnants of which may extend in the subsurface across the northern
part of the central Wabigoon Subprovince as far south as the Garden Lake greenstone belt. Neoarchean magmatism obliterated most direct evidence for the existence of the Paleoarchean and Mesoarchean terrane, but its antiquity is reflected in the Nd isotopes of the granitoid
rocks.
The usefulness and limitations of binned frequency histograms and probability density distributions for displaying absolute age data; Radiogenic age and isotopic studies: Report 13
Authors: Sircombe K
Published: November 2010

Initial assessment and visual communication of the salient features of large sets of geochronological age data are commonly achieved with binned frequency histograms or probability density distributions. Both are estimates of the sample distribution and each has
inherent limitations. Although simple and effective at conveying frequency information, histograms have two important limitations, i.e. analytical errors are discarded and diagram appearance is potentially vulnerable to bias because of arbitrary decisions about interval widths. A method for
assessing the efficiency of bin widths is presented. Age probability density distribution diagrams use a variable gaussian kernel method that accounts for the analytical error of individual datum. This also provides for the standardization of display by avoiding arbitrary bin width selection.
However, these diagrams are limited by the lack of visual frequency data. Thus to maximize displayed information in some cases it may be beneficial to combine both methods.
Microstructure of Neoarchean zircon from the Acasta gneiss complex, Northwest Territories; Radiogenic age and isotopic studies: Report 13
Authors: Sanborn N , Stern R , Desgreniers S , Botton G A
Published: November 2010

The microstructure of zircon from a late Archean granite dyke from the Acasta gneiss complex was investigated using a number of microprobe techniques. Zircons from the study sample are composed of low-Ca, unaltered and high-Ca, altered domains. Transmission
electron microscopy indicates that the unaltered areas have a distorted crystalline microstructure. The detailed microstructure of altered zircon is heterogeneous, composed of a mixture of low-Ca, crystalline domains and amorphous, high-Ca domains. Calculations show that radiation damage
accumulated from the decay of U and Th over the entire life of the sample would have rendered the sample metamict. We conclude that the observed crystalline structure is the result of recrystallization late in the geological history of the sample. Sensitive high-resolution ion microprobe U-Pb ages
from the low Ca, crystalline zircon are concordant, suggesting that Pb loss did not accompany the recrystallization process.
The Neoproterozoic Windermere Supergroup: an on-land continental margin turbidite system, British Columbia and Alberta
Authors: Ross G M
Published: November 2010

The Windermere Supergroup is a regionally widespread succession of predominantly deep marine sedimentary rocks deposited on the continental margin of western Canada following its separation from Australia ca. 700 Ma. A vertical succession from sand-rich basin
plain turbidites ta mud-rich slope facies occurs over a ca. 7 km thick stratigraphie interval and records the progradation of the continental margin attendant with diminished rates of thermally-driven subsidence. Although unfossiliferous and deformed in the Mesozoic, careful stratigraphie mapping,
utilizing a lithologically distinct condensed interval (SHEET 2) and two carbonate-rich lowstand intervals have established regional continuity of this depositional system over ca. 4° of latitude. The continuity of the depositional system has also been established using geochronology of
detrital zircons which reveals a uniform provenance throughout the southeastern Canadian Cordillera (SHEET 2). Taken in concert with facies patterns and paleocurrent data, the Windermere grits are interpreted as a longitudinal turbidite system that flowed west
An intercalibrated biostratigraphy of the Upper Triassic of Black Bear Ridge, Williston Lake, northeast British Columbia
Authors: Orchard M J , McRoberts C A , Tozer E T , Johns M J , Sandy M
R , Shaner J S
Published: November 2010

Black Bear Ridge on Williston Lake is one of several important North American reference sections for intercalibrating the ranges of Upper Triassic ammonoids, conodonts, bivalves, ichthyoliths, and brachiopods. The section (Ludington and Pardonet formations) spans
the uppermost Carnian through Hettangian of the Lower Jurassic. The co-occurrence of several fossil groups facilitates an integrated biozonation of the interval. Fossil fauna and biofacies serve to identify significant biological and sedimentary events in the history of the Late Triassic. Conodont
and ichthyolith faunal change is gradual through the Carnian-Norian boundary, whereas conodont and ammonoid changes are dramatic across the Lower-Middle Norian boundary. Major transgressions are recog- nized in both the Lower and Middle Norian, and are marked by a conodont (Norigondolella) and
ichthyolith (Birgeria) biofacies.
New insights into metavolcanic successions and geochemistry of the Eagle Bay Assemblage, south-central British Columbia
Authors: Bailey S L , Paradis S , Johnston S
T
Published: November 2010

The Eagle Bay Assemblage of the Kootenay Terrane in the Johnson and Adams lakes area comprises deformed, greenschist-facies sedimentary rocks and bimodal volcanic rocks. Two volcanic successions are present, an Upper Devonian mafic and felsic metavolcanic
succession and a Lower Cambrian mafic metavolcanic succession. The latter is interbedded with archaeocyathid-bearing carbonate rocks. Upper Devonian U-Pb zircon ages of 360 ± 6 Ma have been obtained for felsic metavolcanic rocks of the bimodal succession. Lithogeochemical analyses of the
metavolcanic rocks have identified two distinct metabasic successions. Mafic metavolcanic rocks of the Upper Devonian bimodal succession are alkalic, whereas Cambrian mafic metavolcanic rocks are subalkaline. The mafic metavolcanic rocks of the bimodal alkalic succession are associated with base-
and precious-metal occurrences, such as the Rea, Samatosum, and Homestake deposits.
Volcanic stratigraphy and mineral potential of the Aylmer dome, southeastern Slave Province, Northwest Territories
Authors: Renaud J , MacLachlan K , Relf C , Duke N
Published: November 2010

The Aylmer dome is a prominent geological feature in the northeastern Walmsley Lake map sheet (NTS 75 N), southeastern Slave Province. The dome is composed of a granitoid core rimmed by a narrow volcanic belt, overlain by regionally extensive metaturbidite of the
Yellowknife Supergroup. The volcanic stratigraphy comprises a con- formable succession of basal mafic flows and gabbroic sills, overlain by a fine-grained, intermediate to felsic volcaniclastic sequence with a lens of intermediate breccia in the northwest. The upper felsic sequence is capped by
iron-formation deposited at the volcanic-sedimentary interface. Airborne magnetic and electromagnetic geophysical surveys defined several conductive and magnetic horizons within the volcanic belt, and a continuous magnetic and conductive response coincident with the capping iron-formation. Ongoing
work is aimed at resolution of a more detailed stratigraphy and petrogenesis of the volca- nic rocks and will aid in assessing the mineral potential of the belt, in particular the magnetic and conductive hori- zons identified by geophysics.
Geological setting of the Meadowbank iron-formation-hosted gold deposits, Nunavut
Authors: Sherlock R L , Alexander R B , March R , Kellner J , Barclay W
A
Published: November 2010

The Meadowbank gold deposits are located in the Archean Woodburn Lake group of the western Churchill Province. The stratigraphy that hosts the depos- its consists of felsic to intermediate volcaniclastic rocks and interbedded iron-formation. The stratigraphic
sequence is polydeformed, with four phases of deformation recognized regionally; two of which have substantially modified the geometry of the strata. The ini- tial phase of deformation was a progressive transposition of the stratigraphy with tight to isoclinal folding that culmi- nated in low-angle,
high-strain zones. This progressive deformation event appears to have controlled the distribution of gold mineralization. Overprinting, northeast-southwest, shallow-plunging folds further modified the geometry of the mineralized body.
Mesoarchean western margin of the Superior Craton in the Lake Winnipeg area, Manitoba
Authors: Percival J A , Bailes A H , McNicoll V
Published: November 2010

The west-facing Lewis-Storey rift assemblage of arkosic grit, quartzite, komatiite, and iron-formation rests uncon- formably on ca. 3 Ga basement in eastern Lake Winnipeg. Regional correlations suggest a probable ca. 2.9 Ga age for the sequence, which may mark
the Mesoarchean western margin of the North Caribou terrane. The rift package is structurally overlain by the east-facing Black Island assemblage of submarine tholeiitic and calc-alkalic basaltic rocks and the <2.706 Ga arkosic Hole River sequence. Prominent, northwest-trending, dextral D
1 shear zones, thought to be responsible for tectonic juxtaposition of the major tectonostratigraphic assemblages, are overprinted by S 2 crenulations and the D 3 Seymourville shear zone that accommodated 7 km of dextral strike slip. Possible linkages between these tectonic elements and those of the
Rice Lake and Wallace Lake belts to the east are being explored through geochemical, geochronological, and structural studies.
Tectonic evolution of the northern Pickle Lake greenstone belt, northwestern Superior Province, Ontario
Authors: Young M , Helmstaedt H
Published: November 2010

The northern part of the Pickle Lake greenstone belt was previously thought to comprise two volcanic assemblages termed the Northern Pickle (inferred to be ca. 2990 Ma) and the Pickle Crow (ca. 2892 Ma) assemblages. Struc- tural evidence and aeromagnetic patterns
suggest that the inferred tectonic boundary between these two assem- blages may not be significant and that this part of the belt may belong to a single composite Northern Pickle-Pickle Crow assemblage. Evidence for at least three deformation events is recognized: 1) an early, local planar fabric
pre- dating 2860 Ma; 2) the main regional foliation (S 1 ), bracketed between 2860 Ma and 2742 Ma; and 3) F 2 folds and overprints of the regional foliation associated with the emplacement of plutonic bodies at ca. 2741 Ma. A regional 'Kenoran' fabric of post-Confederation age has not yet been
recognized in the northern part of the Pickle Lake belt.
Assimilation du carbone, des nutriments et des métaux lourds par l'épinette noire (Picea mariana (Mill). BSP) à pproximité de la fonderie Horne, Rouyn-Noranda, Québec
Authors: Marion J , Savard M M , Bégin C , Parent M
Published: November 2010

The combination of complementary dendrogeochemical tracers associated with discrete functions in trees consti- tutes a new environmental monitoring tool. These tracers, carbon isotopes, nutrients, and heavy metals in tree rings record the effects of anthropogenic
point-source contaminants. Initial tracer assimilation steps are well known: active absorption of heavy metals and nutrients through the root system and assimilation of carbon through foliage. To better define subsequent assimilation steps, this study analyzes isotopic and elemental distribution
within the stem, branches, and leaves of a black spruce specimen. Carbon assimilation follows a Rayleigh process that suggests the same priority of allocation as for nutrients. Results also confirm the previously established sam- pling protocol in the Metals in the Environment (MITE) program for
dendrogeochemical environmental surveys.
Investigation of zinc-lead mineralization on eastern Cornwallis Island, Arctic Archipelago, Nunavut
Authors: Turner E C
Published: November 2010

Areas of known mineralization in Ordovician through Devonian rocks on eastern Cornwallis Island were visited as reconnaissance for a project that will address the genesis and geological controls on Zn-Pb mineralization within the Polaris zinc district and
elsewhere in the Arctic Islands. Parts of the Thumb Mountain, Cape Phillips, Allen Bay, Barlow Inlet, and Disappointment Bay formations are host to Mississippi Valley-type mineralization, which is vari- ously localized by 1) normal faults, 2) facies boundaries, or 3) a major unconformity. Much of
the mineralization is indicated by development of gossans, but some is present without any significant weathering features. The pres- ence of showings that completely lack galena and have only sparse Fe-sulphides suggests that there may be more than one mineralizing event or fluid source behind the
various showing types in the area.
High-resolution sonar profiling of glacial and postglacial sediments in the Ottawa River near L'Orignal, Ontario
Authors: Douma M , Aylsworth J M
Published: November 2010

In 1999, a high-resolution sub-bottom sonar survey in the Ottawa River, 5 km west of L'Orignal, Ontario, indicated faulted Champlain Sea sediments. In 2000, detailed grid surveys consisting of 42 line kilometres of single-channel sub-bottom sonar data were
conducted to outline the extent of the faulted areas. A rotated block of sediment, 130 m by 200 mand up to 25 mthick, was discovered to have rotated about 15° . Smaller rotated sections, and areas of dif- ferential compaction occur along strike from the large rotated block. Small independently
rotated blocks also occur nearby. Faulting and rotation of sediments is attributed to earthquake shaking. Seismic liquefaction of sediment leading to the development of excess pore pressure may have caused an initial failure along a single glide plane, which sub- sequently propagated upward in a
curving path, through the overlying layers, to form a spoon-shaped slip plane.
Résultats initiaux d'une partie des travaux de caractérisation hydrogéologique des aquifères fracturés du sud-ouest du Québec
Authors: Fagnan N , Nastev M , Lefebvre R , Martel R , Savard M
M
Published: November 2010

This report presents part of the preliminary results of the 1999--2000 fieldwork undertaken within the framework of a hydrogeological fractured-rock mapping project led by the Geological Survey of Canada. The study area consists of a sequence of Paleozoic
sedimentary rocks overlain by Quaternary sediments. The sediments form thick accu- mulations in the vicinity of the Oka Hills and along the terrace in the Saint-Hermas and Lachute sectors. A piezometric survey carried out to produce a regional groundwater elevation map revealed that the piezometric
sur- face closely follows the surface topography. A regional hydrogeological map was developed. Confined conditions are found within areas of thick Quaternary deposits. Unconfined conditions are found in areas of thin deposits; these areas constitute the main recharge zones of fractured-rock
aquifers.
Résultats initiaux de la caractérisation hydrogéologique des aquifères fracturés du sud-ouest du Québec
Authors: Bourque E , Cloutier V , Lefebvre R , Savard M M , Nastev M , Martel R
Published: November 2010

The characterization of groundwater hydrogeochemistry of the regional county municipalities of Argenteuil, Mirabel, Deux-Montagnes, and Thérèse-de Blainville is underway as part of a regional hydrogeological mapping project of the fractured aquifers of
southwestern Quebec. The goal of the hydrogeochemistry component is to eval- uate regional groundwater quality and identify geochemical processes controlling this quality. Three sampling campaigns were conducted, one in spring 1999, one in summer 1999, and another in summer 2000. Preliminary results
of the measurement of physico-chemical parameters and the analysis of groundwater samples for inor-ganic and isotopic (stable isotoped 18 O) concentrations reveal significant variations in groundwater geochemistry. These variations seem to be controlled in part by geological units and by
hydrogeological context. Moreover, pre- cipitation was analyzed for stable isotopes to establish the local meteoric waterline for the area. This will help understand the origin of groundwater.
Regional hydrogeological mapping project of the St. Lawrence Lowlands of southwestern Quebec: hydrogeological characterization work 1999-2000
Authors: Nastev M , Savard M M , Lefebvre R , Martel R , Fagnan N , Bourque E , Hamel A , Karanta G , Lemieux J M
Published: November 2010

The GSC is carrying out a regional hydrogeological mapping project of fractured rock aquifers in the St. Lawrence Lowlands of southwestern Quebec. The regional aquifer consists of Paleozoic fractured sedimentary rocks. This aquifer is mostly confined with clay
and silt sediments at lower altitudes whereas over topographic heights it becomes a water-table aquifer. This paper presents the fieldwork and results of the hydrogeological characteriza- tion based on 361 constant-head injection tests, 4 large-scale pumping tests, 4 pulse tests, and 3 step pumping
tests, as well as slug tests performed in 23 boreholes and 10 observation wells. The first results indicate that carbonate and sandstone rocks are the most exploitable regional aquifers in the region. The average transmissivity shows a weak decreasing trend with depth. When present, the deep sandy
gravel layer overlying the top of frac- tured aquifers is believed to be the major conduit for groundwater flow.
Structural style and tectonostratigraphy of the external-internal Humber zone boundary in the Sainte-Marie - Saint-Sylvestre area, Quebec Appalachians
Authors: Castonguay S , Lemieux Y , Marcotte B , Tremblay A
Published: November 2010

The geology of the Sainte-Marie-de-Beauce-Saint-Sylvestre area depicts a tectonostratigraphic, structural, and metamorphic transition that characterizes the boundary between the external and internal Humber Zone. It also corresponds to a region of reversal in
structural vergence and tectonic transport, i.e. from foreland-directed struc- tures in the northwestern part to hinterland-directed structures in the southeastern part. A series of thrust nappes make up tectonostratigraphic packages that are correlated to various stratigraphic units: the
Sainte-Hénédine, Rivière Filkars, Richardson, and Oak Hill nappes comprise rocks units of the Île d'Orléans, Saint-Roch, Armagh, and Oak Hill groups, respectively. To the southeast, the Bennett Fault separates these nappes from metamorphosed and polydeformed lithologies of
the Rosaire Group and Bennett Schists. The Bennett Fault is a southeast-directed backthrust fault, which best corresponds to the dominant structure representing the boundary between the external and internal Humber Zone.
Geology of the northern margin of the Trans-Hudson Orogen (Foxe Fold Belt), central Baffin Island, Nunavut
Authors: Corrigan D , Scott D J , St-Onge M R
Published: November 2010

The northern flank of the Trans-Hudson Orogen on central Baffin Island comprises, from north to south 1) reworked Archean basement (Rae Province); 2) the Paleoproterozoic Piling Group, which comprises a lower, pas- sive-margin sequence (Dewar Lakes and Flint Lake
formations) and an upper, foredeep sequence (Astarte River and Longstaff Bluff formations); 3) a mafic volcanic thrust sheet (Bravo Lake formation); and 4) a metamor- phic-plutonic internal zone. Field relationships suggest that the contact between the Piling Group and the underly- ing Archean
basement is a reworked unconformity. Locally, the contact is obscured by the presence of large biotite syeno- to monzogranite plutons that crosscut both the Piling Group and the Archean basement. Four distinct tectonometamorphic episodes are recorded, with an earlier, middle-amphibolite-facies
Archean event (D 1A ), two compressional Paleoproterozoic events (D 1P and D 2P ), and a late cross-folding event (D 3P ) that produced a set of basement culminations in the southern portion of the map area.
Evaluating the potential for three-dimensional structural modelling of the Archean and Paleoproterozoic rocks of central Baffin Island, Nunavut
Authors: de Kemp E A , Corrigan D , St-Onge M
R
Published: November 2010

The Archean and Paleoproterozoic rocks of western central Baffin Island are being mapped at 1:100 000 scale at the exposed topographic surface. This data is being used to create three-dimensional (3D) structural models of key lithotectonic boundaries and
associated deformation fabrics. Initial field investigations indicate extensive base- ment involvement during Paleoproterozoic deformation, along with folding and thrusting of cover rocks. Three-dimensional modelling of the complex structures produced by these processes would help extend our geo-
logical interpretations, now confined to 2D models in the form of geological maps, into the subsurface, thus helping to constrain the tectonic framework in this northern margin of the Trans-Hudson Orogen. Three-dimensional mod- elling activity is focused on extending the geometry of the basement
(Archean) / cover (Paleoproterozoic) bound- ary, vergence mapping of regional folds and faults developed in the upper sequence of the Piling Group (Longstaff Bluff Formation), and the high-resolution 3D mapping of the base of the mafic volcanic Bravo Lake Formation.
Surficial geology, Binta Lake, British Columbia
Authors: Plouffe A , Mate D J
Published: November 2010

The Binta Lake map area is characterized by an extensive cover of till deposited during the Late Wisconsinan Fraser Glaciation. Glaciofluvial sand and gravel are dominantly present in the valleys. Glacial lake sediments, which consist of well sorted fine sand,
silt and clay were mapped in the François Lake, Takysie Lake, Ootsanee Lake, and Ootsa Lake valleys. During the last glaciation, ice was generally flowing from west to east and was deflected by topographic high. Ice retreat was generally from east to west with complex ice front configuration.
Suficial geology mapping of the Binta Lake map area was completed under the Nechako Natmap Project (1995-2000).
Dispersion glaciosédimentaire sur le piémont laurentien dans la région de Québec (Québec): des fragments de roches carbonatées sur le Bouclier canadien
Authors: Bolduc A M , Liard M
Published: November 2010

The last three ice-flow movements which affected the Québec area during Late Wisconsinan are: a regional ice flow to the southeast associated with the glacial maximum, a second flow to the northeast related to an ice stream in the axis of the St. Lawrence
River, and a late glacial ice flow to the north. This project was undertaken to assess whether glacial dispersal could be associated with the northward and northeastward ice flows. The stair-step margin between the Canadian Shield and the St. Lawrence Platform permits the distinction of the
northeastern and northern components of glacial transport from the main component toward the southeast. Results show clearly that carbonate clasts from the St. Lawrence Platform were transported onto the Canadian Shield. This dispersal is associated with
the St. Lawrence ice stream (toward the northeast). The northward movement does not appear to have significantly remobilized the sedimentary load of the glacier.
Quaternary dates and vertebrate faunas in Saskatchewan
Authors: Morlan R E , McNeely R , Wolfe S A , Schreiner B T
Published: November 2010

This Date List presents 830 radiocarbon age determinations made by various Radiocarbon Dating Laboratories over the past 40 years, and for the first time optical ages on samples collected in Saskatchewan. The dates are presented in three sections: i)
archaeological samples (?370) with their associated vertebrate faunas, ii) geological samples (?460), and iii) optical samples (?40). The archaeological dates include cultural affiliations and associated vertebrate faunas, where identified, and have been presented based on their Borden designation.
The geological dates have been organized thematically on the following topics: pre- Holocene dates; deglaciation history; glacial lakes; Holocene dates; and paleontological dates. The optical dates relate to eolian activity in Saskatchewan and all ages have been produced by the Simon Fraser
Laboratory (SFU-O). Ten laboratories have been involved in radiocarbon dating archaeological materials (S, Beta, RIDDL, SFU, TO, GaK, GX, AECV, CAMS, and GSC), and ten laboratories have dated geological samples (S, GSC, GX, Beta, AECV, CAMS, TO, I, QU, and WIS). These data are also available on the
Web at the GSC Labs WebPage at <> in the Database / Open File module, and the archaeological data are available interactively in Mapping Ancient History at
<> and on the Canadian Archaeological Radiocarbon Database at <>.
Lower Cretaceous stratigraphy and tectonics of eastern Bella Coola map area, southwest British Columbia
Authors: Struik L C , Mahoney J B , Hrudey M G , Diakow L J , Woodsworth G J , Haggart J W , Poulton T
P , Sparks H A , Kaiser E A
Published: November 2010

Lower Cretaceous stratigraphic units in the study area consist mainly of flows and fragmental rocks that include basalt and andesite, minor rhyolite and dacite, and epiclastic intervals of sandstone, slate, siltstone, and conglomerate. These rocks are correlated
with the Monarch volcanic rocks widespread to the southeast, lie nonconformably on Early Cretaceous plutons, and are interpreted to be deposited onto older plutonic suites. The Cretaceous succession may have formed during east-west crustal extension, and later was tightly to isoclinally and
asymmetrically folded to the northeast. The succession appears to have been deposited on an Early Cretaceous topographic high that had sufficient relief to host marine basins and adja-cent subaerial hills. The Hazelton Group appears to be absent beneath the Cretaceous succession. Known
mineralization (primarily copper) in the Cretaceous volcano-sedimentary rocks is mainly associated with pluton contacts or fault zones. The slate units almost everywhere have minor disseminated pyrite.
Geomorphic evidence for Tertiary drainage networks in the southern Coast Mountains, British Columbia
Authors: Tribe S
Published: November 2010

Tertiary drainage networks are reconstructed by mapping drainage anomalies and valley trends on shaded-relief maps of the southern Coast Mountains (NTS 92 G, H, I, J). Geological and structural relationships provide age constraints for the valleys. In the
vicinity of Gold Bridge, ancestral Bridge River and Seton River flowed northeast sometime between latest Cretaceous and Eocene time. Strike-slip faulting along the Yalakom and Fraser faults diverted the rivers to the southeast during Eocene time. Lillooet River valley crosscut and captured the
headwaters of the ancestral Bridge and Seton rivers. Geomorphic evidence indicates an ancestral Fraser River did not flow south along the trace of the Fraser Fault until sometime after Eocene strike-slip faulting. A dendritic network of streams developed throughout the region in Miocene time, and
incised during late Miocene-Pliocene regional uplift.
Quaternary geology of southern Melville Peninsula, Nunavut
Authors: Dredge L A
Published: November 2010

Quaternary glaciations have created sandy granitic till, calcareous silty till, calcareous glaciomarine deposits, raised marine beaches, and scoured rock outcrop. Accompanying maps are used to reconstruct glacial history. Limestone erratics on uplands suggest
extensive Foxe Ice prior to the last glaciation. Clay minerals in regolith and upland block fields indicate an ensuing weathering interval, followed by a periglacial period. During the Foxe (=Wisconsin) Glaciation, ice on uplands coalesced to form a local ice sheet (Melville Ice). This ice sheet was
later subsumed by Foxe Ice, although a subsidiary divide persisted on the peninsula, blocking and diverting Foxe Ice flow. Cold-based zones and local ice divides preserved the regolith on the plateaus. Some areas gradually became warm-based. Deglaciation began with penetration of a marine re-entrant
south of Wales Island about 8600 years ago, with ice streaming through Rae Isthmus and development of Melville Moraine as far south as Matheson River. Marine limit elevations suggest rapid, progressive breakup of Foxe Ice 6800. Geochemical signatures from till and gossan samples are related to rock
lithology, directions and styles of glacial transport, and length of time available for weathering. Tills within areas controlled by Foxe Basin ice are far-travelled, while those beneath the Melville Ice divide reflect the composition of underlying rock types. Lead/zinc ratios in regolith, till, and
gossans indicate postglacial geochemical reactivity. Gossans associated with Zn, Cd, Ni, and Cu anomalies are preferentially found in rocks of the Prince Albert Group, and schist-marble contacts in the Penrhyn Group.
A new approach to downhole seismic imaging, Halfmile Lake, New Brunswick
Authors: Bellefleur G , Muller C , Snyder D , Matthews L , Forsyth D , Roberts B , Tammadge D
Published: November 2010

Downhole seismic data were acquired at Halfmile Lake, New Brunswick, in July 2001, to image known massive sulphide lenses and investigate the potential for a steeply dipping mineralized zone connecting them. The survey comprised two parts designed to provide
different imaging capabilities. The first part consisted of four offset VSPs with receivers placed between 265 mand 1300 mdepth. A2.5 kmline with 23 shot points was then recorded at receiver positions between 585 mand 815 m. This novel geometry was selected due to its suitability to image the
lateral extent of the sulphide lenses at specific depths. The off-set VSPs image the vertical extent of the sulphide lenses. Data from both parts of the survey already show several reflections after minimal processing. Reflected P- and S-waves and converted waves (P-S) from the Deep Halfmile lens
are observed on several VSPs. Data quality is good with significant improvement expected after further processing.
Preliminary geological and petrographic study of the Poplar Mountain Au occurrence, southwestern New Brunswick
Authors: Chi G , Watters S E
Published: November 2010

The Poplar Mountain Volcanic Complex consists of three principal volcanic and subvolcanic units in the Poplar Mountain area, i.e. porphyritic dacite, dacitic volcaniclastic rocks, and basaltic volcanic rocks. The porphyritic dacite is a subvolcanic intrusion
located in the centre of a volcanic dome and is sur-rounded by dacitic volcaniclastic rocks. The basaltic unit is stratigraphically above the felsic units. Gold mineralization is mainly associated with arsenopyrite, and to a lesser extent with pyrite and stibnite. The sulphides are disseminated in
the dacite, and in various quartz-carbonate-sericite veins and quartz-cemented breccia. The mineralized zones are characterized by a higher degree of fracturing and veining than the barren zones, and are closely related to phyllic (sericite+carbonate+quartz+illite) alteration. Propyllitic
(chlorite+carbonate+illite) alteration is widespread, and is mainly preserved in nonmineralized zones. The mineralization and alteration share some analogies with low-sulphidation epithermal deposits, or the outer zone of a porphyry-type system.
Focal mechanisms for eastern Canadian earthquakes of 2000
Authors: Bent A L , Drysdale J
Published: November 2010

Although earthquake focal mechanism solutions provide information about the faults on which the earthquakes occur and on local stress field orientations and seismotectonics, until recently they were not routinely determined for eastern Canadian earthquakes. We
have begun to systematically attempt to determine focal mechanisms for all eastern Canadian earthquakes of magnitude 4.0 or greater. We intend to publish the results annually in an Open File. This report covers the calendar year 2000. Ten earthquakes were analyzed. We were able to determine focal
mechanisms for seven. As has been the case in previous efforts, those events for which we could not obtain solutions occurred in regions were the seismograph network coverage is sparse.
SHRIMP U-Pb ages of multiple metamorphic events in the Angikuni Lake area, western Chruchill Province, Nunavut; Radiogenic Age and Isotopic Studies: Report 15
Authors: Berman R G , Davis W J , Aspler L
B , Chiarenzelli J R
Published: November 2010

Paragneiss near Angikuni Lake, Nunavut contains large, low-CaO garnet porphyroblasts(type I), enveloped by gneissic layering, and post-tectonic, thin garnet rims and microporphyroblasts withmuch higher CaO (type II). Calculated pressure-temperature conditions are
approximately 5.4 kbar and730°C for type I garnet, and 11 kbar and 740°C for type II garnet. In situ sensitive high-resolution ion microprobe (SHRIMP) measurements yielded two age populations of monazite, 2.54 " 0.02 Ga and 1.93 " 0.05Ga, that are interpreted to date the two types of
garnet growth. The new data indicate that a domain of2.56.2.5 Ga high-grade metamorphism and associated deformation extends approximately 400 km fromChesterfield Inlet at least as far southwest as the Angikuni Lake area.
Stratigraphy of the Lower Cretaceous Monarch sequence at Mount Creswell in east-central Bella Coola map area, west-central British Columbia
Authors: Sparks H A , Struik L C
Published: November 2010

Results of a detailed study of the Lower Cretaceous Monarch sequence at Mount Creswell, in Bella Coola map area (NTS 93 D), British Columbia, reveal large episodes of nonexplosive volcanism from nearby volcanoes alternating with relatively explosive volcanism
from more distal volcanoes as major components of the sequence. Minor chaotic zones of sedimentation alternating with lava and pyroclastic flows may represent times of uplift and erosion followed by explosive eruptions from nearby sources and proximal volcanoes. The volcanic and sedimentary rocks
from Mount Creswell are representative of the Lower Cretaceous volcanic rocks of the Bella Coola map area.
Petrology, geochemistry, and geochronology of the granitic pegmatite and aplite dykes associated with the Clarence Stream gold deposit, southwestern New Brunswick
Authors: Thorne K G , Lentz D R , Hall D C , Yang X
Published: November 2010

Granitic dykes intimately associated with auriferous sulphide-bearing quartz veins crosscut metasedimentary and metagabbroic units at the Clarence Stream gold deposit in southwestern New Brunswick. Aplitic, granophyric, pegmatitic, and leucogranitic dykes of
granitic composition (SiO2 = 66.6.81.4 wt. %) are weakly metaluminous to peraluminous (A/CNK = 0.96.1.1). Low Nb, Ta, La, Y, and Yb with high Rb contents indicate a syncollisional (S-type) or fractionated volcanic-arc (I-type) affinity. Electron microprobe dating of monazite within a pegmatitic
sample yielded a crystallization age of 390 " 8Ma (high Th+U) and another population (low Th+U) that coincides with Taconic orogenic events (449 " 10 Ma). Low Sb, W, Mo, and Bi concentrations along with the coincident age of emplacement and trace-element systematics favour a fractional
crystallization relationship with the main phase of the Magaguadavic Granite during late-stage vapour saturation. The spatial and temporal relationship to gold-bearing sulphide-quartz veins is consistent with an intrusion-related genetic model.
Petrology of the Lake George granodiorite stock, New Brunswick: implications for crystallization conditions, volatile exsolution, and W-Mo-Au-Sb mineralization
Authors: Yang X , Lentz D R , Hall D C , Chi G
Published: November 2010

The Lake George Sb vein deposit is spatially and temporally associated with W-Mo-Au mineralization that is genetically related to an Early Devonian granodiorite stock at depth. The fine to medium-grained porphyritic granodiorite consists of quartz, plagioclase,
orthoclase, biotite, and trace hornblende, with minor titanite, zircon, apatite, ilmenite, and trace magnetite. Apatite started to crystallize at 881°C to 911°C, followed by hornblende, biotite, and plagioclase at 729°C to 772°C, then quartz and orthoclase. The magmatic system
was reset by late-stage subsolidus processes under 500°C. Early hornblende phenocrysts started to crystallize at 5 kbar during magma ascent, but final emplacement of the stock was epizonal (less than 2 kbar). Magmatic fluids equilibrated with biotite are characterized by Cl-rich compositions,
large variations in halogen fugacity ratios, and reducing conditions; the evolving fluids emanated from the progressively crystallizing magma at depth, favouring Au partitioning from magma to the hydrothermal system.
Hierarchical classification of tectonic assemblages for use with thematic, computer-based query systems: a preliminary scheme
Authors: Struik L C , Quat M B
Published: November 2010

A hierarchical system of classification for tectonic assemblages is introduced to permit thematic querying of bedrock geological databases. Such a hierarchical scheme permits query capture of specific and general tectonic environments. The classification
hierarchy is based on the premise that all rock formations formed in a tectonic environment stem from a single lineage, formation of the universe. We deal solely with the segment of the lineage on Earth, because of our present preoccupation with geological mapping on Earth. Tectonic assemblages
formed on Earth are classified by plate tectonic theory and extraterrestrial impacts. The scheme is extensible, although its evolution for the Earth-based component is restricted by use of plate tectonic genetic concepts.
Ice-flow history and drift prospecting in the Committee Bay belt, central Nunavut: results from the Targeted Geoscience Initiative
Authors: McMartin I , Little E C , Ferbey T , Ozyer C A , Utting D
J
Published: November 2010

Mapping of ice-flow indicators in the Committee Bay supracrustal belt (NTS 56 K, 56 J/9 to /16, 56-O/1 to /8, and 56 P) provides new evidence for a complicated ice-movement chronology during the Late Wisconsinan. Three main phases of ice movement have been
identified at the regional scale. The oldest is northerly and is found throughout most of the area. This was followed early in the deglaciation
sequence by northeastward flow in the eastern part of the area and northwesterly flow in the western part. Finally, there is a north-northwesterly flow south of the Chantrey moraines, associated with ice flow from the Keewatin Ice Divide. Results from drift-prospecting studies indicate that till
geochemistry reflects a clear northerly direction of glacial transport. Most of the known gold showings are recognized in the gold-grain counts and/or the gold values in the till matrix, but at least two previously unknown, potentially
gold-rich domains have been identified.
Recent results and activities of the Integrated Petroleum Resources Potential and Geoscience Studies of the Bowser and Sustut basins project
Authors: Evenchick C A , Ferri F , Mustard P S , McMechan M , Osadetz K , Stasiuk L , Wilson N S F , Enkin R , Hadlari T , McNicoll V
J
Published: November 2010

Recent research on energy resource potential of the Bowser and Sustut basins includes identifying effective petroleum systems, increasing geographic coverage of thermal maturity data, initiating paleomagnetic studies, and geological mapping. Crude oil samples
extracted and characterized from four locations yield results that confirm a recently published revised thermal maturity model for the region and identify potential petroleum systems with sources in the Stikine Assemblage and younger strata. Identification of Stikinia sources and recognition of
possible reservoirs in the Hazelton Group indicates that strata below the Bowser Lake Group might also be prospective for petroleum accumulation. Paleomagnetic sampling of Permian to Late Jurassic strata has the capacity to recognize several periods of deformation, burial history, igneous heating,
and fluid migrations. New mapping in McConnell Creek area significantly revises distribution of upper Hazelton Group clastic rocks, assigns lithofacies assemblages to Bowser Lake Group strata, and modifies Sustut Group map distribution and structures.
Canadian strong ground motion recordings of the 28 February, 2001 M=6.8 Nisqually (Seattle-Olympia) Washington, Earthquake
Authors: Cassidy J F , Molnar S , Rogers G C , Mulder T , Little T E
Published: November 2010

An earthquake of M =6.8 [M =5.9] occurred on 28 February 2001 near Olympia, Washington, W L approximately 150 km SSE of Victoria and 235 km S of Vancouver. This earthquake, the largest in the area in more than 50 years, was a deep (52 km) normal-faulting event
that occurred within the subducting Juan de Fuca plate. It was felt strongly across southwestern British Columbia, and as far away as southeastern British Columbia and Banff, Alberta (700 km from the epicentre). This earthquake triggered strong motion instruments at 32 sites in southwestern British
Columbia, thus providing the largest single strong motion data set collected in this region to date. Peak horizontal ground accelerations ranged from 0.3%g to 3.5%g (2.9-34.2 cm/s2), at epicentral distances of 150-300 km. In this Open File we present time series plots of the acceleration,
velocity, and displacement data, as well as the Fourier spectra, and the Response spectra. Tabulated station parameters and peak accelerations are given together with maps of the network configurations showing the locations of triggered and untriggered instruments.