Other
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46..159g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 46, Issue 2, pp.159-165
Other
14
Scientific paper
On the basis of recently reported data on the kinetics of carbon-13 exchange between CO 2 and CH 4 at temperatures above 500°C, first order rate constants log K = 11.16-10,190/ T were derived allowing variations in , the difference in the isotopic composition of coexisting CO 2 and CH 4 , to be evaluated as a function of initial composition and cooling rate of the rising geothermal fluid. Observed -values in geothermal discharges are likely to represent frozen in compositions attained after minimum residence times of 20 ka at 400°C or 10 Ma at 300°C. The carbon-13 contents of any biogenic gases are unlikely to have been affected by thermal re-equilibration at temperatures below 200°C. The chemical equilibrium involving CO 2 and CH 4 can be expected to proceed about a hundred times faster than isotopic equilibration.
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