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Figure 5 | Geochemical Transactions

Figure 5

From: Real-time drilling mud gas monitoring for qualitative evaluation of hydrocarbon gas composition during deep sea drilling in the Nankai Trough Kumano Basin

Figure 5

Results for deuterium and methane carbon isotope ratios. Left panel: δDCH4 values determined for different gas samples from IODP Expedition 338 [23]. Horizontal bars indicate the standard deviation of duplicate measurements. Right panel: δ13CCH4 data obtained during drilling borehole C0002F (modified from [23]). Starting at 1700 mbsf, the δ13CCH4 data indicate a shift to methane of thermogenic origin (boundaries after [26]).

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