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Murchison xenoliths

Olsen, Edward J. and Davis, Andrew M. and Hutcheon, Ian D. and Clayton, Robert N. and Mayeda, Toshiko K. and Grossman, Lawrence (1988) Murchison xenoliths. Geochimica et Cosmochimica Acta, 52 (6). pp. 1615-1626. ISSN 0016-7037. doi:10.1016/0016-7037(88)90230-X.

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C3 xenoliths in a C2 host (Murchison) are unique among known meteoritic xenolith-host occurrences. They offer an opportunity to determine possible effects on the xenoliths by the hydrated host. Eleven xenoliths were found ranging from 2 to 13 mm. Four of these Murchison Xenoliths (MX1, MX2, MX3 and MX4) have been studied in detail. MX1 and MX2 were large enough for trace element, oxygen isotope, carbon isotope, bulk carbon and bulk nitrogen determinations. All four were studied petrographically and by analytical SEM. The xenoliths cannot be unequivocally identified as C3V or C3O subtypes. MX1 contains some matrix phyllosilicate, indicating reaction with water. MX 1, MX2 and MX3 all show extensive alteration by an FeO-rich medium, and some minerals in them contain ferric iron. MX4, however, exhibits very minor alteration by FeO only. Oxygen isotopic and chemical data show that the alteration of these xenoliths did not take place in the Murchison host. The alterations occurred in one or more parent bodies, which were later disrupted to release these xenoliths that ultimately accreted onto the Murchison parent body.

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Additional Information:© 1988 Elsevier Ltd. Received 24 August 1987, Accepted 11 March 1988. We thank J. R. Goldsmith and R. C. Newton for valuable aid in performing the hydrothermal experiments, R. W. Hinton for making the ion microprobe measurements, and V. Ekambaram for a portion of the neutron activation analyses. We thank G. J. MacPherson and R. C. Newton for useful discussions. The infrared spectrophotometry was done in the Materials Research Laboratory of the University of Chicago (funded by National Science Foundation grant DMR 82-16892). This research was supported by grants from the National Science Foundation, EAR 83-16812 (R.N.C.) and the National Aeronautics and Space Administration NAGW-23 (E.O.); NCL 14-001-169 (R.N.C.); NAG 9-111 (A.M.D.); and NGR 14-001-249 and NAG 9-54 (L.G.). Additional support was received from the Chalmers Fund of the Field Museum of Natural History.
Funding AgencyGrant Number
NSFDMR 82-16892
NSFEAR 83-16812
NASANCL 14-001-169
NASANGR 14-001-249
Field Museum of Natural HistoryUNSPECIFIED
Issue or Number:6
Record Number:CaltechAUTHORS:20170427-090016157
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Official Citation:Edward J Olsen, Andrew M Davis, Ian D Hutcheon, Robert N Clayton, Toshiko K Mayeda, Lawrence Grossman, Murchison xenoliths, Geochimica et Cosmochimica Acta, Volume 52, Issue 6, 1988, Pages 1615-1626, ISSN 0016-7037, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76985
Deposited By: Tony Diaz
Deposited On:27 Apr 2017 16:14
Last Modified:15 Nov 2021 17:04

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