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Cristobalite-pyroxene in an L6 chondrite - Implications for metamorphismCRISPY is a cristobalite-pyroxene assemblage in the L6 chondrite ALHA 76003. It was formed by reaction of a very siliceous inclusion with the surrounding olivine-rich rock. Oxygen isotopes show that the inclusion was derived from a source with non-chondritic isotopic composition. The isotopes also show that the oxygen of the pyroxene reaction product was derived by simple mixing of oxygen from the inclusion and its immediately adjacent surroundings, with exchange with the bulk meteorite limited to a distance of about a millimeter. The persistence of cristobalite in close proximity to olivine, and the lack of isotopic equilibration, show that the metamorphic processes that form petrographic grade 6 chondrites involve transport of major elements over distances only on the order of millimeters.
Document ID
19820036460
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Olsen, E. J.
(Field Museum of Natural History Chicago, IL, United States)
Mayeda, T. K.
(Field Museum of Natural History Chicago, IL, United States)
Clayton, R. N.
(Chicago, University Chicago, IL, United States)
Date Acquired
August 10, 2013
Publication Date
December 1, 1981
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 56
Subject Category
Lunar And Planetary Exploration
Accession Number
82A19995
Funding Number(s)
CONTRACT_GRANT: NSF EAR-78-23680
CONTRACT_GRANT: NAGW-23
Distribution Limits
Public
Copyright
Other

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