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. 2020 Jan 11;35(1):ME19103. doi: 10.1264/jsme2.ME19103

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2020 by Japanese Society of Microbial Ecology / Japanese Society of Soil Microbiology / Taiwan Society of Microbial Ecology / Japanese Society of Plant Microbe Interactions / Japanese Society for Extremophiles.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 3. — (A) Stable carbon isotope composition of CH₄ in natural gas samples and dissolved inorganic carbon in groundwater samples. The categorization of CH₄ origins was made according to Smith and Pallasser (1996). Dashed lines: equal carbon isotopic fractionation, α_c=(δ¹³C_DIC+10³)/(δ¹³C_CH₄+10³), for α_c=1.02, 1.04, 1.06, and 1.08. (B) Stable carbon isotope composition of CH₄ and hydrocarbon gas composition C₁/(C₂+C₃) in natural gas samples. The categorization of CH₄ origins was made according to Bernard et al. (1978). VPDB, Vienna Pee Dee Belemnite.