Mathematics – Logic
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.3123z&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 13, p. 3123-3148.
Mathematics
Logic
115
Carbonaceous Chondrites, Chemical Composition, Meteoritic Microstructures, Weathering, Aqueous Solutions, Chemical Reactions, Chondrule, Mineralogy, Meteorites, Mineralogy, Composition, Matrix, Chondrites, Rims, Data, Stony Meteorites, Chondrites, C Chondrites, Alteration, Parent Bodies, Co Chondrites, Cr Chondrites, Cv Chondrites, Antarctic Meteorites, Ci Chondrites, Temperature, Thermal Effects, Mineralogy, Catalog, Procedure, Laboratory Studies, Cm Chondrites, Serpentine, Heating, Tochilinite, Yamato Met
Scientific paper
The degree of compositional variation of fine-grained minerals displayed by the members within any carbonaceous chondrite group (i.e., CI, CM, CV, CR) is a direct reflection of the range of aqueous alteration assemblages present. Matrix and fine-grained chondrule rims within any particular carbonaceous chondrite are mineralogically nearly identical to one another, but not necessarily similar in bulk elemental composition, even though they have subsequently experienced postaccretional secondary processing (aqueous alteration) under identical conditions. We propose that CO chondrites experienced parent body conditions of low f(O2), low water/rock ratios, and temperatures below 50 C. CR chondrites experienced higher water/rock ratios, potentially higher temperatures (not above 150 C), and a wide range of f(O2). The alteration mineralogy of CV chondrites indicates water/rock ratios at the high end (at least) of the range for CR chondrites, Essebi, and MAC 87300. CM chondrites experienced temperatures below 50 C, low f(O2) and low water/rock ratios, except EET 83334, which probably experienced relatively higher f(O2), and B-7904 and Y-86720, which experienced postalteration temperatures in the range 500-700 C. Most CI chondrites experienced temperatures between 50 and 150 C, relatively high water/rock ratios, and variable f(O2). Y-82162 witnessed postalteration heating, possibly as high as 400 C.
Barrett Richard
Browning Lauren
Zolensky Michael
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