Computer Science
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.2433e&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 49, Nov. 1985, p. 2433-2444.
Computer Science
7
Allende Meteorite, Inclusions, Meteoritic Composition, Meteoritic Microstructures, Condensation, Crystallization, Mineralogy, Petrography, Spinel, Meteorites, Allende, Inclusions, Cv3 Chondrites, Stony Meteorites, Cais, Petrography, Texture, Grains, Description, Features, Chemistry, Core, Mantle, Crystals, Mineralogy, Zoning, Comparisons, Fassaite, Spinel, Composition, Formation, Condensation, Crystallization, Evaporation, Distillation, Refractory Material, Melilite, Calcium, Aluminum
Scientific paper
The petrology, mineralogy, and mineral chemistry of a coarse-grained calcium-aluminum-rich inclusion from Allende are studied. The inclusion consists of a spinel-fassaite-melilite core surrounded by a melilite mantle. The zoning, chemical variation between crystals, and concentration of molecules in the melilite and fassaite of the spinel-free island, spinel-rich area, and melilite mantle are examined. The possible formation of the inclusion by gas-solid condensation, crystallization from a homogeneous refractory silicate melt, and evaporative loss due to distillation is analyzed. These processes, however, do not explain the textural relations and mineral chemistries of the spinel-free island, spinel-rich areas, and melilite mantle. The formation of the inclusion by spinel-free islands forming by crystallization from a spinel deficient liquid, the capture of solid clasts and Fremdlinge in a more refractory spinel-saturated liquid, and formation of the outer melilite veneer mantle from two refractory liquid layers is proposed.
Armstrong Thomas J.
El Gorsey A.
Wasserburg Gerald J.
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