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We investigated carbon isotope compositions of methane and molecular compositions in void gas samples from Integrated Ocean Drilling Program Expedition 315 Site C0001. Methane is the predominant gas with traces of ethane and no heavier hydrocarbons detected. The methane/ethane (C1/C2) ratios of all samples are higher than 5500. The δ 13 C values of methane range from –74.9‰ to –73.9‰. These data indicate that methane found in Hole C0001F is predominantly of microbial origin.

Data report: carbon isotope compositions of methane in void gas samples from IODP Expedition 315 Site C0001, Nankai Trough, offshore Japan