In situ survey of graphite in unequilibrated chondrites - Morphologies, C, N, and H isotopes

Details In situ survey of graphite in unequilibrated chondrites - Morphologies, C, N, and H isotopes In situ survey of graphite in unequilibrated chondrites - Morphologies, C, N, and H isotopes

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..989m&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 989.

Computer Science

3

Graphite, Chondrites, Morphology, Carbon Isotopes, Nitrogen Isotopes, Hydrogen Isotopes, Interstellar Gas, Molecular Clouds

Scientific paper

We identified various graphite morphologies in situ in chondritic meteorites. Measurements of their C-, N-, and H-isotopic compositions with SIMS revealed large variations in delta-N-15 ratios in the various morphologies in the same chondrite. Graphites with very high enrichments in N-15 were encountered in Khohar (delta-N-15 up to 955 percent). These graphites probably originated from interstellar molecular clouds. Also large enrichments in N-15 (delta-N-15 up to 438 percent) were found in Acfer 182, 207, and 214. Systematic variations in delta-C-13 were also found among H, L, LL, CR, and CO chondrites.

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