Heavy carbon in individual oxide grains from the Murchison meteorite

Details Heavy carbon in individual oxide grains from the Murchison meteorite Heavy carbon in individual oxide grains from the Murchison meteorite

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..84..359z&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 84, no. 4, Aug. 1987, p. 359-368.

Computer Science

14

Carbon Isotopes, Metal Oxides, Meteoritic Composition, Murchison Meteorite, Hydrogen Isotopes, Ion Microscopes, Mineralogy, Silicon, Meteorites, Murchison, Carbon, Oxides, Grains, Samples, Meteorite, Isotopes, Composition, Laboratory Studies, Experiments, Cm2 Chondrites, Stony Meteorites, Carbonaceous Chondrites, Dust, Origin, Formation, Microprobe Methods, Energy Dispersive X-Ray Analysis

Scientific paper

The carbon isotopic composition of individual oxide grains from Murchison HF-HCl acid residue CFOc has been measured in the ion microprobe. Many grains contain carbon with large C-13 excesses ranging to 7000 per mil. In most cases the carbon is present as micron-sized subgrains. The association of silicon with the anomalous carbon points towards SiC as carrier. If this tentative identification is correct, then the SIC grains most likely originated in the circumstellar atmospheres of red giants. Oxide grains in which the O-18/O-16 ratio has also been measured show variable O-16 excesses which are not correlated with the C-13 excesses. This indicates that the sources of the anomalous carbon and oxygen isotopic compositions of the oxide grains are unrelated.

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