Computer Science
Scientific paper
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.
Bar-Matthews Miryam
Grossman Lawrence
Hutcheon Ian D.
MacPherson Glenn J.
No associations
LandOfFree
A corundum-rich inclusion in the Murchison carbonaceous chondrite does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A corundum-rich inclusion in the Murchison carbonaceous chondrite, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A corundum-rich inclusion in the Murchison carbonaceous chondrite will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1456445