Figure F77. Relationship between the C1/(C2 + C3) ratios and δ13C-CH4 in headspace gas, Site C0002. Open star = end-member of microbial methane, solid star = end-member of thermogenic methane, presumed so that the mixing line between the two end-members best fits the observed data. Solid curve = mixing line between the two end-members. Percent values indicate the contribution of thermogenic methane. VPDB = Vienna Peedee belemnite.
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