Nitrogen and carbon isotopes in presolar diamond samples with known noble gas isotope signature

Details Nitrogen and carbon isotopes in presolar diamond samples with known noble gas isotope signature Nitrogen and carbon isotopes in presolar diamond samples with known noble gas isotope signature

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29..544v&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 544-545

Computer Science

3

Allende Meteorite, Carbon Isotopes, Diamonds, Meteoritic Composition, Nitrogen Isotopes, Orgueil Meteorite, Rare Gases, Nuclear Fusion, Pyrolysis, Supernovae, Synthesis (Chemistry), Temperature Effects

Scientific paper

Since the first analyses of C and N isotopes in presolar diamonds with known noble gas isotope composition more than a decade ago the investigation of these isotope systems in diamonds was developed practically independently. During this time many interesting details in isotopic systematics of all the elements involved were found and reviewed. The main conclusion now reached from a decade of investigation is that presolar diamonds from different meteorites are not identical but appear to consist of several populations. The finding of a consensus between noble gas and light-element analyses would seem to be a vital step so that more detailed nucleosynthesis models may be developed for the diamond formation. We have analyzed three pure diamond samples separated at Cal Tech from Allende, Orgueil (henceforth CT samples), and Leoville for N and C isotopic composition by stepped pyrolysis and combustion. It should be noted that sample purity is supposed to be an important condition affecting release pattern of noble gases and N due to chemical reaction between coexisting minerals. Therefore we expected the influence of the reactions to be eliminated or significantly reduced for the samples studied here compared to those (OU samples) analyzed before. Surprisingly we did not find any particular difference in C and N isotope systematics for the CT and OU samples.

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