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Gas Chemistry of Pore Fluids from Oomine
Ridge on the Nankai Accretionary Prism
Tomohiro Toki, Kenji Maegawa, Urumu Tsunogai,
Shinsuke Kawagucci, Naoto Takahata, Yuji Sano, Juichiro Ashi,
Masataka Kinoshita, and Toshitaka Gamo
Abstract Pore fluids were sampled from a sediment core acquired at a seepage site
at Oomine Ridge in the Nankai accretionary prism, and dissolved gases in the pore
fluids were concurrently extracted with an onboard vacuum system. Gas concentrations
of gas samples were higher than those of fluid samples, suggesting the gas
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