Origin of opaque assemblages in C3V meteorites - Implications for nebular and planetary processes

Details Origin of opaque assemblages in C3V meteorites - Implications for nebular and planetary processes Origin of opaque assemblages in C3V meteorites - Implications for nebular and planetary processes

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53..543b&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, Feb. 1989, p. 543-556.

Computer Science

20

Cosmochemistry, Meteoritic Composition, Planetary Evolution, Refractory Materials, Aluminum Compounds, Calcium Compounds, Chondrule, Opacity, Solar System, Meteorites, Carbonaceous Chondrites, C3V Chondrites, Origin, Formation, Opacity, Solar Nebula, Planets, Minerals, Inclusions, Cais, Chondrules, Matrix, Samples, Meteorite, Laboratory Studies, Chemistry, Comparisons, Temperature, Fugacity, Models, Alloys, Mineral Phases, Photomicrographs, Sem, Electron Microscopy, Condensation, Melting, Crystallization, E

Scientific paper

The results of analyses of meteoritic opaque assemblages (OAs) are presented and used in conjunction with literature data on phase equilibria and diffusion to further develop the hypothesis of Blum et al. (1989) for the origin of OAs in Ca,Al-rich inclusions (CAIs). Based on the results of the analyses, it is suggested that OAs formed after the crystallization of host CAIs by exsolution, sulfidation, and oxidation of precursor alloys at low temperatures (about 770 K) and higher than solar gas sulfur and oxygen fugacities. This model contrasts with previous models that call upon the formation of CAI OAs by aggregation of previously formed phases in the solar nebula prior to the crystallization of CAIs.

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