A corundum-rich inclusion in the Murchison carbonaceous chondrite

Details A corundum-rich inclusion in the Murchison carbonaceous chondrite A corundum-rich inclusion in the Murchison carbonaceous chondrite

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46...31b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, Jan. 1982, p. 31-41. Research supported by the Alfred P. Sloan Foundation

Computer Science

16

Aluminum Oxides, Carbonaceous Chondrites, Inclusions, Ion Probes, Magnesium Isotopes, Meteoritic Composition, Abundance, Aluminum 27, Condensates, Hypervelocity Impact, Isotopic Enrichment, Refractory Materials, Thermodynamics, Data, Mass Spectrometry, Sem, Bb-5 Inclusion, Liquids, Origin, Melting, Samples, Terrestrial, Meteorite, Meteorites, Corundum, Hibonite, Carbonaceous Chondrites, Murchison Meteorite, Inclusions, Thermodynamics, Refractory Elements, Condensation, Electron Microprobe, Texture, Isotopes

Scientific paper

Although thermodynamic calculations predict corundum to be the first condensate from a cooling gas of solar composition, a corundum-hibonite inclusion, BB-5, has for the first time been found in the Murchison carbonaceous chondrite. Ion microprobe measurements of Mg isotopic compositions yield the result, unexpected in such an early condensate, that Mg-26 excesses are small despite large Al-27/Mg-24 ratios. The extreme temperature required to melt this inclusion makes a liquid origin unlikely, except by the hypervelocity impact of refractory bodies. Alternatively, B-5 is a direct gas-solid condensate, and its uniform Mg-26 enrichment must be a characteristic of the reservoir from which it condensed. Nebular heterogeneity in magnesium isotopic composition is the preferred explanation for the formation of such a reservoir.

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