Isotopic, optical, and trace element properties of large single SiC grains from the Murchison meteorite

Details Isotopic, optical, and trace element properties of large single SiC grains from the Murchison meteorite Isotopic, optical, and trace element properties of large single SiC grains from the Murchison meteorite

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.1715v&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 56, April 1992, p. 1715-1733. Research supported by NASA, NSF, and FFWF.

Computer Science

50

Grain Size, Meteoritic Composition, Murchison Meteorite, Optical Properties, Silicon Carbides, Trace Elements, Carbon 13, Mass Spectroscopy, Nitrogen 15, Raman Spectroscopy

Scientific paper

Ion probe mass spectrometry is used to analyze 41 large SiC grains from the Murchison CM2 chondrite, ranging up to 15 x 26 microns, for the isotopic compositions of C, N, Mg, and Si, and the concentrations of Al, Ti, V, Fe, Zr, and Ba. The majority were found to have large isotopic anomalies. Only two grains, characterized by extremely heavy carbon, give evidence for fossil Mg-26. On the basis of C and Si isotopic composition, 29 of the grains fall into three compact clusters, presumably from three discrete sources. The clustering of coarse-grained SiC stands in sharp contrast to the quasi-continuous distribution of finer-grained SiC and suggests that the top 0.1 percent of the mass distribution is a distinct population. The C and N isotopic compositions of the anomalous grains are not very diagnostic, being consistent with H-burning in the CNO cycle. The Si-isotopic compositions qualitatively show the signature of neutron capture in He-burning shells of highly evolved stars.

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