Large isotopic anomalies of Si, C, N and noble gases in interstellar silicon carbide from the Murray meteorite

Details Large isotopic anomalies of Si, C, N and noble gases in interstellar silicon carbide from the Murray meteorite Large isotopic anomalies of Si, C, N and noble gases in interstellar silicon carbide from the Murray meteorite

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.330..730z&link_type=abstract

Nature (ISSN 0028-0836), vol. 330, Dec. 24, 1987, p. 730-732.

Computer Science

69

Carbon, Interstellar Matter, Murray Meteorite, Nitrogen, Rare Gases, Silicon, Silicon Carbides, Amorphous Silicon, Carbon Stars, Chondrites, Meteorites, Stony Meteorites, Carbonaceous Chondrites, Cm2 Chondrites, Samples, Meteorite, Murray, Isotopes, Anomalies, Silicon, Carbon, Nitrogen, Rare Gases, Silicon Carbide, Origin, Microprobe Methods, Grains, Composition, Laboratory Studies, Enrichment, Abundance

Scientific paper

Primitive meteorites contain several noble gas components with anomalous isotopic compositions which imply that they - and their solid 'carrier' phases - are of exotic, pre-solar origin. The authors found that minor fractions of the Murray meteorite contain two minerals not previously seen in meteorites: silicon carbide and an amorphous Si-O phase. They report ion microprobe analyses of these phases which reveal very large isotopic anomalies in silicon, nitrogen and carbon, exceeding the highest anomalies previously measured by factors of up to ≡50. It is concluded that these phases are circumstellar grains from carbon-rich stars, whose chemical inertness allowed them to survive in exceptionally well-preserved form.

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