Computer Science
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..64..186k&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 64, no. 2, Aug. 1983, p. 186-200.
Computer Science
55
Carbonaceous Chondrites, Kerogen, Meteoritic Composition, Organic Materials, Carbon Isotopes, Hydrogen Isotopes, Interstellar Matter, Murray Meteorite, Nitrogen Isotopes, Orgueil Meteorite, Meteorites, Carbonceous Chondrites, Isotopes, Composition, Kerogen, Origin, Source, Organic Matter, Isotopes, Heterogeneity, Patterns, Carbon, Hydrogen, Nitrogen, Orgueil, Murray, Samples, Meteorite, Comparisons, Fractionation, Temperatures
Scientific paper
Stepwise combustion has revealed systematic patterns of isotopic heterogeneity for C, H and N in the insoluble organic fraction (m-kerogen) from the Orgueil and Murray carbonaceous chondrites. Those patterns are essentially identical for both meteorites, indicating a common source of m-kerogen. The data cannot be reconciled with a single mass-fractionation process acting upon a single precursor composition. This indicates either a multi-path history of mass-dependent processing or a significant nucleogenetic contribution, or both. If mass-fractionation were the dominant process, the magnitude of the observed isotopic variability strongly suggests that ion-molecule reactions at very low temperatures, probably in interstellar clouds, were responsible. In any case, an interstellar, rather than solar nebular, origin for at least some of the meteoritic organic matter is indicated. This has interesting implications for the origin of prebiotic molecules, temperatures in the early solar system, and the isotopic compositions of volatiles accreted by the terrestrial planets.
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