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Chromite and olivine in type II chondrules in carbonaceous and ordinary chondrites - Implications for thermal histories and group differencesUnequilibrated chromite and olivine margin compositions in type II chondrules are noted to differ systematically among three of the chondrite groups, suggesting that type II liquids differed in composition among the groups. These differences may be interpreted as indicators of different chemical compositions of the precursor solids which underwent melting, or, perhaps, as differences in the extent to which immiscible metal sulfide droplets were lost during chondrule formation. Because zinc is detectable only in type II chromites which have undergone reequilibration, the high zinc contents reported for chondritic chromites in other studies probably reflect redistribution during thermal metamorphism.
Document ID
19910046582
Document Type
Reprint (Version printed in journal)
Authors
Johnson, Craig A. (American Museum of Natural History New York, NY, United States)
Prinz, Martin (American Museum of Natural History New York, United States)
Date Acquired
August 14, 2013
Publication Date
March 1, 1991
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 55
ISSN: 0016-7037
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NAG9-32
Distribution Limits
Public
Copyright
Other