Figure 2 | Scientific Reports

Figure 2

From: Origin of methane-rich natural gas at the West Pacific convergent plate boundary

Figure 2

Correlation diagram (Bernard’s plot) between δ13C values and CH4/(C2H6 + C3H8) ratios of methane-rich natural gases at the West Pacific convergent plate boundary. Dotted curves show mixing lines between thermogenic and microbial end members, and between EPR and microbial end members of hydrocarbons. EPR indicates abiotic methane in hydrothermal systems of the East Pacific Rise. Arrows indicate the evolution of δ13C values and CH4/(C2H6 + C3H8) ratios during methane oxidation and migration, respectively.

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