Interstellar grains in meteorites. I - Isolation of SiC, graphite, and diamond; size distributions of SiC and graphite. II - SiC and its noble gases

Details Interstellar grains in meteorites. I - Isolation of SiC, graphite, and diamond; size distributions of SiC and graphite. II - SiC and its noble gases Interstellar grains in meteorites. I - Isolation of SiC, graphite, and diamond; size distributions of SiC and graphite. II - SiC and its noble gases

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58..459a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, p. 459

Computer Science

201

Interstellar Matter, Meteorites, Size Distribution, Silicon Carbides, Graphite, Diamonds, Morphology, Chemical Composition, Grain Size

Scientific paper

A new separation procedure is described that permits recovery of grains of interstellar graphite, diamond and SiC from primitive meteorites in greater than 90 percent purity and with yields generally of 70 percent or more. The method relies mainly on a set of progressively more corrosive 'selective solvents' to remove phases one by one, but also includes grain size and density separations. The procedure is applied here to the Murchison C2M meteorite to analyze He, Ne, Ar, Kr, and Xe. The results indicate that the SIC grains are pristine circumstellar condensates from red giant carbon stars representing a range of masses, metallicities, temperatures, and neutron densities. The results suggest that gas-rich SiC grains predate the solar system by at least 130 Ma and possibly up to 2000 Ma.

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