'Fluffy' Type A Ca-, Al-rich inclusions in the Allende meteorite

Details 'Fluffy' Type A Ca-, Al-rich inclusions in the Allende meteorite 'Fluffy' Type A Ca-, Al-rich inclusions in the Allende meteorite

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48...29m&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 48, Jan. 1984, p. 29-46.

Computer Science

34

Carbonaceous Chondrites, Meteoritic Composition, Aluminum, Calcium, Crystal Structure, Electron Microscopy, Inclusions, Minerals, Photomicrographs, Solar System, Spinel, Meteorites, Inclusions, Cais, Calcium, Aluminum, Allende, Mineralogy, Melilite, Spinel, Perovskite, Hibonite, Texture, Characteristics, Descriptions, Structure, Shapes, Formation, Origin, Crystallization, Condensation, Composition, Aggregates, Pressure, Temperature

Scientific paper

Inclusions called 'fluffy' Type A's or FTA's in the Allende meteorite are examined as possible candidates for relict vapor-solid condensate grains, remaining from the original solar nebula. Type A inclusions are characterized by abundant melilite and absence of primary anorthite and titaniferous pyroxene. Fluffy Type A's were probably loosely bound clumps of crystals drifting in the solar nebula, analogous to dustballs or snowflakes. Polished thin sections of all samples were studied optically and with a JEOL JSM-35 scanning electron microscope. It is reasonably clear that neither whole FTA's nor constituent nodules of the coarser grained ones were ever molten. Despite solid-state recrystallization which has affected these inclusions to varying degrees, the coarser grained material remaining in many of them is probably a relic of vapor-solid condensation in the solar nebula.

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