Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29q.507m&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 507
Computer Science
3
Diamonds, Interstellar Matter, Meteoritic Composition, Nitrogen, Rare Gases, Ureilites, Isotopic Enrichment, Mass Spectroscopy, Shock Heating, Temperature Effects
Scientific paper
Interstellar diamonds isolated from primitive meteorites have large amounts of planetary type noble gases, in addition to the anomalous compoments, Xe-HL and light N. Urelitic diamonds, which are of solar system origin, have large amounts of planetary gases. The Lahrauli ureilite has large amounts of planetary gases, as well as the lightest delta N-15 of -110% for a bulk ureilite. In order to see whether the diamond is the carrier of light N and to understand the origin of trapped gases in diamonds of presolar and solar origin, we studied N and noble gases in the diamonds isolated from Lahrauli. Nitrogen and noble gases were extracted and were analyzed by static mass spectrometry. Diamond is enriched in both N and trapped noble gases. Diamond can account for almost the total N and noble gas inventory of the bulk meteorite. The trapped noble gas amounts in ureilites are comparable to those of interstellar diamonds, but the N contents are about an order of magnitude lower. If diamonds in ureilites acquired their N in-situ by the shock process that formed them, a monoisotopic N component, similar to that of bulk meteorite, is expected. But the presence of a similar light N component in diamonds from urelites having different bulk delta(15)N values indicates that ureilitic diamonds most probably have formed in a nebular process, in a region where a light N reservoir exists.
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