Physics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.1395s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 55, Issue 5, pp.1395-1405
Physics
3
Scientific paper
Carbon isotopic analyses of C 1 -C 4 hydrocarbons were carried out to investigate the origin and formation mechanism of natural gases commercially produced from volcanic rocks as well as sedimentary rocks in the "Green Tuff" basin of Northeast Japan, whose high 3 He/ 4 He ratios have suggested a possible magmatic origin. 13 C (PDB) values of methane, ethane, propane, and n-butane range from -54.4 to - 33.3%., from -32.5 to -20.9V from -27.7 to -20.6%. and from -25.3 to -20.5%., respectively, all of which fall within the ranges of published data of worldwide gases of biogenie origin. Most samples show the isotope distribution pattern wherein the 13 C values become less negative with increasing molecular weight of the hydrocarbons, suggesting that the C 2+ hydrocarbons were not derived by methane polymerization. The 13 C values of C 2 -C 4 hydrocarbons are explained by thermogenic breakdown of organic matter, whereas the 13 C values of methane are more or less lower than those expected from the same origin. These results indicate that the gases from the Green Tuff Basin consist of thermogenic hydrocarbons plus variable amounts of isotopically lighter microbial methane. Significant contributions of abiogenic methane, which would be isotopically heavier than the thermogenic methane, are not plausible for the gases.
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