Aqueous alteration in carbonaceous chondrites - Mass balance constraints on matrix mineralogy

Details Aqueous alteration in carbonaceous chondrites - Mass balance constraints on matrix mineralogy Aqueous alteration in carbonaceous chondrites - Mass balance constraints on matrix mineralogy

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.2469m&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, Sept. 1987, p. 2469-2477.

Computer Science

42

Carbonaceous Chondrites, Hydrogeology, Mass Balance, Meteoritic Composition, Mineralogy, Permeability, Antarctic Regions, Chemical Composition, Grain Size, Matrix Materials, Meteorites, Carbonaceous Chondrites, Stony Meteorites, Alteration, Water, Matrix, Mineralogy, Samples, Meteorite, Chemistry, Composition, Mass, Cm2 Chondrites, Antarctic Meteorites, Microprobe Methods, Procedure, Alh Meteorites, Eet Meteorites, Catalog, Ci Meteorites, Comparisons

Scientific paper

Bulk 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.

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