Computer Science
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...254.1188r&link_type=abstract
Science (ISSN 0036-8075), vol. 254, Nov. 22, 1991, p. 1188-1191. Research supported by SERC.
Computer Science
61
Chondrites, Cosmic Dust, Diamonds, Isotopes, Meteoritic Composition, Carbon, Carbon 12, Carbon 13, Metamorphic Rocks, Nitrogen, Xenon Isotopes
Scientific paper
Fine-grained diamonds, the most abundant form of circumstellar dust isolated from primitive meteorites, have elemental and isotopic characteristics that are dependent on the host meteorite type. Carbon isotopic compositions vary from -32 to -38 per mil, and nitrogen associated with the diamond changes in overall abundance by over a factor of four from 0.2 to 0.9 weight percent, between ordinary and CM2-type chondrites. Although the ratio of carbon to nitrogen evolves in a distinctive way during combustion of diamond separates, metamorphic degassing of nitrogen is not the main cause of the differences in nitrogen content. The data suggest that intrinsic differences must have been inherited by the diamonds at the time of their formation and that the diamonds were distributed heterogeneously in the solar nebula during condensation. However, the hypothesis that a distinct nitrogen carrier remains hidden within the diamond cannot be ruled out.
Arden John W.
Pillinger Colin T.
Russell Stuart
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