Enrichment of deuterium in insoluble organic matter from primitive meteorites: A solar system origin?

Details Enrichment of deuterium in insoluble organic matter from primitive meteorites: A solar system origin? Enrichment of deuterium in insoluble organic matter from primitive meteorites: A solar system origin?

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006e%26psl.243...15r&link_type=abstract

Earth and Planetary Science Letters, Volume 243, Issue 1-2, p. 15-25.

Computer Science

38

Scientific paper

Because of a systematic enrichment in deuterium, the insoluble organic matter (IOM) of the carbonaceous chondrites is considered to have formed in the interstellar medium. However, the D / H ratios in IOM remain much lower than those measured in the organic molecules commonly observed in the dense interstellar medium. In this study, the D / H ratio of different aromatic and aliphatic molecular fragments of IOM from the Orgueil meteorite was measured by GC-irMS (gas chromatography isotopic ratio mass spectrometry). No correlation was observed between the D / H ratios and structural parameters characterizing the IOM, such as the H / C ratio. However, the δD of the benzylic, aliphatic and aromatic hydrogen into the IOM can be determined to be 1250‰, + 550‰ and + 150‰, respectively, relative to SMOW. This indicates that D-enrichment in IOM is correlated with the C H bond dissociation energy. Such a correlation rules out IOM formation from observed interstellar molecules and suggests instead that the different components of IOM have acquired their D / H ratios by an exchange with a deuterium-rich reservoir after its synthesis. The same process can be invoked to account for the D / H composition of meteoritic water. Findings point to a common process for deuterium enrichment in the solar system.

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