Computer Science
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.1357b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 48, Issue 6, pp.1357-1362
Computer Science
3
Scientific paper
Elemental composition was used to calculate the amounts of compounds produced during the diagenetic evolution of a coal series from the Mahakam delta (Kalimantan, Indonesia). These calculations were based on the following hypotheses: organic nitrogen does not take part in reactions and remains unchanged in the residual organic matter, the only compounds produced are water, carbon dioxide and hydrocarbons. This approach shows that carbon loss during diagenesis is mainly as CO 2 , and hydrogen loss is mainly as H 2 O. Hydrocarbon production is negligible, in accordance with absence of bacterial methane accumulations in the Mahakam delta. The 13 C of coals in the sequence becomes about 2 per mil more positive over the diagenetic depth range of coal evolution. Accounting for the coal 13 C change in terms of CO 2 loss requires that the CO 2 given off have 13 C of about -40%.. Such negative CO 2 has not been observed in natural systems, except when CH 4 is undergoing oxidation. Several plausible causes for this effect are discussed.
Boudou Jean-Paul
Létolle René
Pelet Régis
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