Computer Science
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45.2325w&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 45, Issue 12, pp.2325-2332
Computer Science
8
Scientific paper
Stable carbon isotope ratios measured in syngenetic graphite, epigenetic graphite, and graphitic marble suggests that syngenetic graphite forms only by the metamorphism of carbonaceous detritus. Metamorphism of calcareous rocks with carbonaceous detritus is accompanied by an exchange of carbon between the two, which may result in large changes in isotopic composition of the non-carbonate phase but does not affect the relative proportions of the two reactants in the rock. Epigenetic graphite forms only from carbonaceous material or preexisting graphite. The reactions involved are the water gas reaction (C + H 2 O CO + H 2 ) at 800-900°C, and the Boudouard reaction (2CO C + CO 2 ), which probably takes place at temperatures about 50-100°C lower.
Friedman Irving
Gleason Jim P.
Weis Paul L.
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