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Progress in Earth and Planetary Science
Fig. 6 | Progress in Earth and Planetary Science

Fig. 6

From: Hydrogen and carbon isotope systematics in hydrogenotrophic methanogenesis under H2-limited and H2-enriched conditions: implications for the origin of methane and its isotopic diagnosis

Fig. 6

Compilation of the isotope systematics of hydrogen (\( {\upalpha^{\mathrm{H}}}_{{\mathrm{CH}}_4\hbox{--} {\mathrm{H}}_2\mathrm{O}} \)) and carbon (\( {\upalpha^{\mathrm{C}}}_{{\mathrm{C}\mathrm{H}}_4\hbox{--} {\mathrm{C}\mathrm{O}}_2} \)) associated with in hydrogenotrophic methanogenesis. Symbol colors of reddish, greenish, and bluish respectively represent datasets of laboratory incubations under high pH2 conditions, incubations under low pH2 condition and observations of “young” methane reservoirs in nature, and observations of “aged” methane reservoirs. Horizontal and vertical gray bars respectively represent the fractionation factors at the equilibriums of hydrogen (\( {\upalpha^{\mathrm{eq}}}_{{\mathrm{CH}}_4\hbox{--} {\mathrm{H}}_2\mathrm{O}} \)) and carbon (\( {\upalpha^{\mathrm{eq}}}_{{\mathrm{CH}}_4\hbox{--} {\mathrm{CO}}_2} \)) at the indicated shown temperatures (0 °C, 122 °C, and 400 °C). All the data sources are listed in the main text (see Discussion)

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