Computer Science
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.2159s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 46, Nov. 1982, p. 2159-2180.
Computer Science
71
Carbonaceous Chondrites, Crystallization, Inclusions, Melts (Crystal Growth), Meteoritic Composition, Phase Diagrams, Aluminum Compounds, Calcium Compounds, Condensates, Petrography, Pyroxenes, Solar System, Spinel
Scientific paper
The results of equilibrium crystallization experiments at one atmosphere on a sample of the Type B Ca-Al-rich inclusions (CAI) of the Allende meteorite are reported. All the experiments were performed on a synthetic sample approximating the Allende CAI characteristics. The crystallization sequence observed comprised spinel at 1550 C, then melilite at 1400 C, anorthite at 1260 C, and then Ti-Al-rich clinopyroxene, formed at 1230 C. The observation that pyroxenes similar to the titaniferous fassaites found in Type B inclusions can be formed by equilibrium crystallizations of melts with Type B composition indicate that some Type B CAIs were at least partially molten. If the temperatures were not too far above the solidus, the molten condensate compositions would be similar to that occurring in gas-to-solid condensation.
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