Accretionary rims on inclusions in the Allende meteorite

Details Accretionary rims on inclusions in the Allende meteorite Accretionary rims on inclusions in the Allende meteorite

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.2267m&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 49, Nov. 1985, p. 2267-2279.

Computer Science

30

Allende Meteorite, Inclusions, Meteoritic Composition, Meteoritic Microstructures, Electron Microscopy, Grain Size, Mineralogy, Olivine, Pyroxenes, Meteorites, Allende, Cv3 Chondrites, Stony Meteorites, Inclusions, Gases, Accretion, Layers, Texture, Mineralogy, Chemistry, Composition, Grains, Description, Matrix, Formation, Aggregate, Thickness, Crystals, Models, Thermal Properties, History, Cooling, Differentiation, Condensation

Scientific paper

The origin and composition of the rim sequence on the refractory inclusion in the Allende meteorite are studied. The different textures, mineralogy, and mineral-chemistry of the four layers of the rim are described. The layers are composed of: pyroxene, needles, olivine, hedenbergite, and andradite. Tables of the element and chemical compositions of the layers are presented. The data reveals that: (1) the layers are highly porous masses of euhedral crystals with no intergrowth; (2) layers contain highly disequilibrium mineral assemblages; and (3) the thickness of the layers varies with the underlying topography. These results support the theory that rim structures are accretionary aggregates formed from accretion of independently grown particles onto the surface of inclusions. The formation of the grains in the layers and matrix from nebular condensates is studied.

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