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Chemical compositions of refractory inclusions in the Murchison C2 chondriteNeutron activation has been used to analyze samples from ten refractory inclusions in Murchison for 36 elements. Two inclusions, BB-5 and MUCH-1, have large negative Yb anomalies unaccompanied by correspondingly large and negative Eu anomalies; six inclusions have group II or III patterns, or variants of such patterns. The frequency of highly fractionated REE patterns, and the absence of group I patterns, suggest that refractory inclusions in Murchison stopped equilibrating with the nebular gas at higher temperatures than most Allende coarse grained inclusions. Murchison inclusions tend to be lower in nonrefractory elements than Allende coarse grained inclusions, further suggesting that, on average, the former underwent less severe secondary alteration than the latter.
Document ID
19850034328
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ekambaram, V.
(Chicago Univ. Chicago, IL, United States)
Davis, A. M.
(Chicago Univ. Chicago, IL, United States)
Grossman, L.
(Chicago, University Chicago, IL, United States)
Kawabe, I.
(Ehime University Matsuyama, Japan; Chicago, University, Chicago, IL, United States)
Tanaka, T.
(Geological Survey of Japan, Yatabe, Ibaraki, Japan; Chicago, University Chicago, IL, United States)
Date Acquired
August 12, 2013
Publication Date
October 1, 1984
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 48
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
85A16479
Funding Number(s)
CONTRACT_GRANT: NAG9-54
CONTRACT_GRANT: NSF EAR-82-18154
CONTRACT_GRANT: NGR-14-001-249
Distribution Limits
Public
Copyright
Other

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