Interstellar SiC in the Murchison and Murray meteorites - Isotopic composition of Ne, Xe, Si, C, and N

Details Interstellar SiC in the Murchison and Murray meteorites - Isotopic composition of Ne, Xe, Si, C, and N Interstellar SiC in the Murchison and Murray meteorites - Isotopic composition of Ne, Xe, Si, C, and N

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.3273z&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, Dec. 1989, p. 3273-3290. Research supported by NASA and NSF.

Computer Science

63

Interstellar Matter, Meteoritic Composition, Murchison Meteorite, Murray Meteorite, Silicon Carbides, Carbon Isotopes, Neon Isotopes, Nitrogen Isotopes, Silicon Isotopes, Xenon Isotopes

Scientific paper

Detailed ion-probe data are reported on Murchison and Murray C2 chondrites, along with noble-gas data on Murchison, with the purpose of characterizing the number and isotopic composition of independent SiC components and to link them to their stellar sources. Results show that coarse-grained and fine-grained SiC (totaling about 6-9 ppm of the two meteorites) contains record concentrations of two exotic components: Ne-E(H) (nearly monoisotopic Ne-22) and Se-S (enriched in isotopes 128, 130, and 132), respectively. The Ne-21 content was found to exceed up to 40-fold the content expected from the recent cosmic-ray irradiation, implying a presolar cosmic-ray exposure age of about 39 Ma. This age is much shorter that the predicted 500 Ma lifetime of refractory interstellar grains and implies either a selective interstellar destruction process for SiC, enhanced supernova activity in the protosolar neighborhood, or late outgassing of greater than 90 percent of the SiC.

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