FINAL TECHNICAL REPORT

Title of Grant: Carbonaceous Chondrites: Early Irradiation and

Principal

Investigator:

241*Pu Fission Records

J. D. Macdougall

Geological Research Division, A-020

Scripps Institution of Oceanography

La Jolla, CA 92093

Period covered: February 1, 1975 - January 31, 1983

Grant Number: NASA NSG 7121

(NASA-Cfi-177288) CARBONACEOUS CHONDRITES:

EARLY IRRADIA1ICN AND Pu-244 FISSION RECORDS

Final Technical Report, 1 let. ., 1975 - 31 .

Jan..1983 (Scripts Institution of

N86-29744

Unclas

Oceanography, La Jclla) 8 p CSCL 03B G3/90 42934

No cost extension until January 31, 1984.
Final Report

-~The~f-o'cus"o'f investigations throughout this work has-been the

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carbonaceous meteorites. The studies which ha-ve—been conducted have

evolved from investigations of early irradiation to mineralogic and

petrologic studies of refractory inclusions and to an examination of

the time scales of alteration processes on the parent bodies. Much

.has—been—i1-ea-r-ned-,- -and—many- new-quest ions-have- been- posed. The attached

papers and abstracts provide the details. These studies are now

continuing under NASA grant NAG9-49.

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List of Abstracts under NASA Grant NSG7121

1975

Mafic silicates in Orgueil. J.F. Kerridge and J.D. Macdougall,

Meteoritics 10,. 424.

Late compaction of C2 chondrites? B.K. Kothari and J.D. Macdougall,

Meteoritics 10, 428.

Pre-compaction irradiation of mafic silicates in Cl and C2 chondrites.

J.D. Macdougall, Meteoritics 10, 449.

Irradiation features in meteoritic and lunar gas-rich breccias: A

comparison. J.D. Macdougall and B. Martinek, Trans. Am.

Geophys. Union 56, 1015.

1976

Particle track and microcrater records in lunar samples and meteorites.

J.N. Goswami, I.D. Hutcheon and J.D. Macdougall, 7th-_Lunar.. and

Planetary Science Conf., 325.

Particle track distributions in Murchison (C2) inclusions. J.D.

Macdougall, Meteoritics 11, 325.

Unusual anhydrous mineral assemblage in the Alais (Cl) meteorite.

J.D. Macdougall and J.F. Kerridge, Meteoritics 11, 326.

The search for the Holy Grail and why Orgueil is not it. J.F. Kerridge,

Meteoritics 11, 308-309.

1977

Charge composition of solar flare heavy nuclei at 4 B.Y. before present.

J.N. Goswami and J.D. Macdougall, Meteoritics 12, 242-243.

Angra Dos Reis revisited: particle tracks and their implications.

D. Lai, D. Macdougall and J. Carlson, Meteoritics 12, 284-285.

Time of compaction of Orgueil. J.D. Macdougall, Meteoritics 12,

301-302.
List of Abstracts under NASA Grant

NSG7121 Page 2

1978

Refractory element rich inclusions in Cl and C2 meteorites. J.D.

Macdougall and J. Carlson. 9th Lunar Planetary Science Conf.,

683-685.

Fractionated magnesium isotopes in Murchison refractory inclusions.

J.D. Macdougall and D. Phinney, 4th International Conference,

Geochronology, Cosmochronology and Isotope Geology, 270-272.

CI regolith period: clues from particle tracks. J.D. Macdougall,

Meteoritics 13, 543.

Clues to the origin of sulfide materials in CI chondrites. J.F.

Kerridge, J.D. Macdougall and K. Marti, Meteoritics 13,

512-513.

Magnesium isotopes in hibonite-bearing inclusions from CM meteorites.

D. Phinney, J.D. Macdougall and B. Whitehead, 10th Lunar

Planetary Science Conf., 975-977.

1979

Refractory spherules and inclusions in Murchison. J.D. Macdougall,

Meteoritics 14, 477-478.

Composition and energy spectra of solar flare heavy nuclei during

the early history.of the solar system. J.N. Goswami, D. Lai

and J.D. Macdougall, Proc. 16th International Cosmic Ray Conf.,

116-121.

Characteristics of ancient solar flare heavy nuclei. J.N. Goswami,

D. Lai and J.D. Macdougall, Conf. on the Ancient Sun, Lunar

and Planetary Institute, 40-42.

1980

Irradiation features in different inclusion types in CM chondrites.

J.N. Goswami and J.D. Macdougall, llth Lunar Planetary Science

Conf., 354-356.

Identification of an ultra-refractory component in the Murchison

meteorite. W.V. Boynton, R.M. Frazier and J.D. Macdougall,

10th Lunar Planetary Science Conf., 103-105.
List of Abstracts under NASA Grant

NSG7121 Page 3

Refractory inclusions in CM meteorites: petrographic studies.

J.D. Macdougall, J.N. Goswami and J. Carlson, Meteoritics 15,

327-328.

Carbonates in CI chondrites. J.F. Kerridge, K. Fredriksson,

E. Jarosewich, J. Nolen and J.D. Macdougall, Meteoritics 15,

313-314.

Trace element abundances in ultra-refractory condensates from the

Murchison meteorite. W.V. Boynton, R.M. Frazier and J.D.

Macdougall, Meteoritics 15, 269

1981

Refractory ABC. J.D. Macdougall, J.F. Kerridge and D. Phinney, 12th

Lunar Planetary Science Conf., 643-645.

Space exposure of breccia components. J.D. Macdougall, Workshop on

Lunar Breccias and Soils and Their Meteoritic Analogs, Houston.

1982

Refractory chondrules in the CM meteorites. J.D. Macdougall,

Conf. on Chondrules and Their Origins, Lunar and Planetary

Science Inst.

Sr isotopic evidence for early aqueous activity on the Orgueil parent

body. J.D. Macdougall, G.W. Lugmair and J.F. Kerridge, 5th

International Conference on Geochronology, Cosmochronology and

Isotope Geology, 223-224.

Time of aqueous activity on CI parent body. J.D. Macdougall, G.W.

Lugmair and J.F. Kerridge, Proc. 13th Lunar and Planetary

Science Conf., 455-456.

1983

Extreme Mg fractionation and evidence of Ti isotopic variations in

Murchison refractory inclusions. I.D. Hutcheon, I.M. Steele,

D.E.S. Wachel, J.D. Macdougall, and D. Phinney, 14th Lunar and

Planetary Science Conf., 339-340.

Are Orgueil carbonates contemporary with parent body formation?

J.D. Macdougall, G.W. Lugmair and J.F. Kerridge, 14th Lunar and

Planetary Science Conf., 454-455.
List of Publications under NASA Grant NSG7121

1976

Track studies bearing on Solar System regoliths. P.B. Price, I.D. Hutcheon,

D. Braddy and D. Macdougall, Proc. Lunar Sci. Conf. 6th, 3449-3469.

Mafic silicates in the Orgueil carbonaceous meteorite. J.F. Kerridge and

J.D. Macdougall, Earth Planet. Sci. Lett. 29, 341-348.

Particle track studies. I.D. Hutcheon and J.D. Macdougall. In: Electron

Microscopy in Mineralogy (H.R. Wenk, ed.) Springer-Verlag, 537-542.

Extraterrestrial Materials. J.D. Macdougall, Geotimes, 21, No. 5, 25-27.

Fission track dating. J.D. Macdougall, Scientific American 235, No. 6,

114-122.

Formation chronology for C2 meteorites. J.D. Macdougall and B.K. Kothari,

Earth Planet. Sci. Lett. 33, 36-44.

Microcraters and solar flare tracks in crystals from carbonaceous chondrites

and lunar breccias. J.N. Goswami, I.D. Hutcheon and J.D. Macdougall,

Proc. Lunar Sci. Conf. 7th, 543-562.

Formation of iron sulphide in the solar nebula. J.F. Kerridge, Nature 259,

189-190.

Major element composition of phyllosilicates in the Orgueil carbonaceous

meteorite. J.F. Kerridge, Earth Planet. Sci. Lett. 29, 194-200.

1977

Cubanite: A new sulfide phase in CI meteorites. J.D. Macdougall and J.F.

Kerridge, Science 197, 561-562.

Olivine separates from Murchison and Cold Bokkeveld: Particle tracks and

noble gases. J.D. Macdougall and D. Phinney, Proc. Lunar Sci. Conf.

8th, 293-311.

Iron: whence it came, where it went. J.F. Kerridge, Space Sci. Rev. 20,

3-68.

Correlation between nickel and sulfur abundances in Orgueil phyllosilicates.

J.F. Kerridge, Geochim. Cosmochim.rActa 41, 1163-1164.

A constraint on impact theories of chondrule formation. J.F. Kerridge and

S.W. Kieffer, Earth Planet. Sci. Lett. 35, 35-42.
List of publications under NASA Grant NSG7121 Page 2

1978

Differential Sm/Nd evolution in oceanic basalts. R.W. Carlson, J.D. Macdougall

and G.W. Lugmair, Geophys. Res. Lett. 5, 229-232.

*Aspects of accretion in the early Solar System. J.F. Kerridge, In Origin of

the Solar System (S.F. Dermott, ed.), Wiley, London.

1979

Refractory element rich inclusions in CM meteorites, J.D. Macdougall, Earth

Planet. Sci. Lett. 42, 1-6.

Iron-nickel sulfides in the Murchison meteorite and their relationship to

phase Ql. J.F. Kerridge, J.D. Macdougall and J. Carlson, Earth Planet.

Sci. Lett. 43, 1-4.

Magnesium isotopic variations in hibonite from the Murchison meteorite: An

ion microprobe study. J.D. Macdougall and D. Phinney, Geophys. Res.

Lett. 6, 215-218.

Clues to the origin of sulfide minerals in CI chondrites. J.F. Kerridge,

J.D. Macdougall and K. Marti, Earth Planet. Sci. Lett. 43, 359-367.

Aqueous activity on asteroids: evidence from carbonaceous meteorites. J.F.

Kerridge and T.E. Bundh, In Asteroids (T. Gehrels, ed.), Univ. Arizona

Press, 745-764.

Magnetite in CI carbonaceous meteorites: Origin by aqueous activity on a

planetesimal surface. J.F. Kerridge, A.L. Mackay and W.V. Boynton,

Science 205, 395-397.

Fractionation of refractory lithophile element among chondritic meteorites.

J.F. Kerridge, Proc. Lunar Planet. Sci. Conf. 10th, 989-996.

1980

Charge composition and energy spectra of ancient solar flare heavy nuclei.

J.N. Goswami, D. Lai and J.D. Macdougall, Proc. Conf. Ancient Sun,

347-364.

1981

Windows to early solar system processes: Refractory inclusions in the CV and

CM chondrites. J.D. Macdougall and J.N. Goswami. Proc. Indian Acad.

Sci. (Earth Planet. Sci.) 90, 1-26.

Refractory spherules in the Murchison meteorite: Are they chondrules?

J.D. Macdougall, Geophys. Res. Lett. 8, 966-969.

* Reprint not included.
List of publications under NASA Grant NSG7121 Page 3

1983

Nuclear track and compositional studies of olivines in CI and CM meteorites.

J.N. Goswami and J.D. Macdougall, J. Geophys. Res. 88, A755-A764.

1984

Early solar system aqueous activity: Sr isotope evidence from the Orgueil CI

Meteorite. J.D. Macdougall, G.W. Lugmair and J.F. Kerridge. Nature

307, 239-251.