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Aqueous alteration in carbonaceous chondrites - Mass balance constraints on matrix mineralogyBulk chemical compositions of matrix material were determined in eleven Antarctic CM chondrites and five non-Antarctic CM and CI chondrites, using microprobe defocused-beam technique. The results, along with previously published data, are used to provide mass balance constraints on the relative proportions of intergrown and intermixed phyllosilicate phases in carbonaceous chondrite matrices. In terms of Fe, Si, and Mg, the CM matrix bulk compositions plot within a triangle defined by the compositions of PCP (a mixture of 25 percent tochilinite and 75 percent cronstedtite), Mg-rich serpentine, and Fe-rich serpentine. Results indicate differing amounts of PCP and serpentines in individual CM matrices. The discrepancies found between predicted and measured S and Ni values require additional sulfide phases. CI matrices were found to contain little, if any, PCP; they consist mostly of serpentine and montmorillonite.
Document ID
19880028210
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mcsween, Harry Y., Jr.
(Tennessee, University Knoxville, United States)
Date Acquired
August 13, 2013
Publication Date
September 1, 1987
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 51
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
88A15437
Funding Number(s)
CONTRACT_GRANT: NAG9-58
Distribution Limits
Public
Copyright
Other

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