Mineral chemistry and origin of spinel-rich inclusions in the Allende CV3 chondrite

Details Mineral chemistry and origin of spinel-rich inclusions in the Allende CV3 chondrite Mineral chemistry and origin of spinel-rich inclusions in the Allende CV3 chondrite

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.1219k&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 49, May 1985, p. 1219-1237.

Computer Science

7

Allende Meteorite, Carbonaceous Chondrites, Chemical Composition, Meteoritic Composition, Mineralogy, Spinel, Abundance, Electron Probes, Grain Size, Interstellar Matter, Olivine, Perovskites, Petrography, Solar Corona, Meteorites, Cv3 Chondrites, Stony Meteorites, Allende, Samples, Meteorite, Mineralogy, Chemistry, Origin, Inclusions, Composition, Formation, Dust, Spinel, Epma, Electron Probe, Comparisons, Aggregates, Fractionation, Distillation, Residue, Solar Nebula, Temperature, Oxidation, Hypotheses, T

Scientific paper

The present electron probe microanalysis of 20 spinel-rich inclusions in Allende indicates that the mineralogy of spinel-rich Allende inclusions is similar to that of fine grained Ca, Al-rich inclusions (CAIs) in ALH-77003 and rims on coarse grained CAIs in Allende. The mineralogy, mineral chemistry, and bulk chemistry of the inclusions indicate that they are not primitive aggregates of crystalline nebular condensates, but rather aggregates of minute concentric objects that are presently interpreted to be a fractionated distillation residue that lost Ca, Si-rich partial melt. It is suggested that interstellar dust aggregates were melted or distilled into Allende inclusions by aerodynamic drag heating, in regions of the nebula where the dust/gas ratio was so enhanced that the local oxygen fugacity was raised by several order of magnitude and liquids became thermodynamically stable.

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