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 sampling greatly reduced the effect of degassing. Air contamination was assessed using noble gases and was negligible. Profiles of isotopic compositions of CH4 and ΣCO2 were strongly consistent between fluid and gas samples, suggesting that the vacuum extraction procedure was successful. Distribution of δDH2 values was consistent with control of hydrogen by fermentation and oxidation of sulfate and carbonate. The relationship of 3He/4He and 4He/20Ne ratios suggested that He composition can be explained by simple mixing of primordial mantle He, radiogenic crustal He, and atmospheric He. When corrected for the atmospheric He component, the helium in the samples is almost entirely of radiogenic origin. The samples represent fluids discharged through a splay fault from the plate boundary, but the contribution of mantle He was very low. It is clear that crustal He pervasively mixed into the fluids from sediment and crust surrounding the pathway of the discharging fluid.
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Acknowledgments
We thank the NSS operation team (University of Tokyo), K. Ikehara (AIST), M. Murayama (Kochi University), M. Komure (Kyushu University), K. Fujino (Nihon University), W. Tanikawa (Kyoto University), S. Suganuma (Kochi University), and Marine Works Japan for their support of sampling, and we thank the captain and crew of R/V Kaiyo during the KY04-11 cruise for their continued dedication.
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Toki, T. et al. (2011). Gas Chemistry of Pore Fluids from Oomine Ridge on the Nankai Accretionary Prism. In: Ogawa, Y., Anma, R., Dilek, Y. (eds) Accretionary Prisms and Convergent Margin Tectonics in the Northwest Pacific Basin. Modern Approaches in Solid Earth Sciences, vol 8. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-8885-7_12
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