Mathematics – Logic
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53..453r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 2, pp.453-460
Mathematics
Logic
3
Scientific paper
No systematic variation is seen in the D/H ratio of insoluble organic matter present in cherts that were deposited over the last 3.5. B.y. Hydrogen isotope exchange experiments between deuterium-rich acid solutions and acid residues extracted from cherts show that hydrogen, extracted after the chert was outgassed at 350°C, is not affected by the contamination from the chemical treatment of the samples. In two modern cherts (Eocene and Pliocene) having exceptionally low 18 O values and high carbon contents, hydrogen extracted by pyrolysis at low temperature (200-350°C) is markedly enriched in deuterium ( D values up to +500%). Such an enrichmment is ascribed to organic products derived from the maturation of kerogen. Provided this hydrogen isotope fractionation is not related to biological activity, a similar effect could have played a role in the maturation of the deuterium-rich organic matter found in the carbonaceous meteorites during an early hydrothermal event.
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