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11 results on '"Yamaguchi, Yasuhiko T."'

4. Deep-biosphere methane production stimulated by geofluids in the Nankai accretionary complex

Author

Ijiri, Akira, Inagaki, Fumio, Kubo, Yusuke, Adhikari, Rishi R., Hattori, Shohei, Hoshino, Tatsuhiko, Imachi, Hiroyuki, Kawagucci, Shinsuke, Morono, Yuki, Ohtomo, Yoko, Ono, Shuhei, Sakai, Sanae, Takai, Ken, Toki, Tomohiro, Wang, David T., Yoshinaga, Marcos Y., Arnold, Gail L., Ashi, Juichiro, Case, David H., Feseker, Tomas, Hinrichs, Kai-Uwe, Ikegawa, Yojiro, Ikehara, Minoru, Kallmeyer, Jens, Kumagai, Hidenori, Lever, Mark A., Morita, Sumito, Nakamura, Ko-ichi, Nakamura, Yuki, Nishizawa, Manabu, Orphan, Victoria J., Røy, Hans, Schmidt, Frauke, Tani, Atsushi, Tanikawa, Wataru, Terada, Takeshi, Tomaru, Hitoshi, Tsuji, Takeshi, Tsunogai, Urumu, Yamaguchi, Yasuhiko T., Yoshida, Naohiro, Ijiri, Akira, Inagaki, Fumio, Kubo, Yusuke, Adhikari, Rishi R., Hattori, Shohei, Hoshino, Tatsuhiko, Imachi, Hiroyuki, Kawagucci, Shinsuke, Morono, Yuki, Ohtomo, Yoko, Ono, Shuhei, Sakai, Sanae, Takai, Ken, Toki, Tomohiro, Wang, David T., Yoshinaga, Marcos Y., Arnold, Gail L., Ashi, Juichiro, Case, David H., Feseker, Tomas, Hinrichs, Kai-Uwe, Ikegawa, Yojiro, Ikehara, Minoru, Kallmeyer, Jens, Kumagai, Hidenori, Lever, Mark A., Morita, Sumito, Nakamura, Ko-ichi, Nakamura, Yuki, Nishizawa, Manabu, Orphan, Victoria J., Røy, Hans, Schmidt, Frauke, Tani, Atsushi, Tanikawa, Wataru, Terada, Takeshi, Tomaru, Hitoshi, Tsuji, Takeshi, Tsunogai, Urumu, Yamaguchi, Yasuhiko T., and Yoshida, Naohiro

Abstract

Microbial life inhabiting subseafloor sediments plays an important role in Earth’s carbon cycle. However, the impact of geodynamic processes on the distributions and carbon-cycling activities of subseafloor life remains poorly constrained. We explore a submarine mud volcano of the Nankai accretionary complex by drilling down to 200 m below the summit. Stable isotopic compositions of water and carbon compounds, including clumped methane isotopologues, suggest that ~90% of methane is microbially produced at 16° to 30°C and 300 to 900 m below seafloor, corresponding to the basin bottom, where fluids in the accretionary prism are supplied via megasplay faults. Radiotracer experiments showed that relatively small microbial populations in deep mud volcano sediments (10² to 10³ cells cm⁻³) include highly active hydrogenotrophic methanogens and acetogens. Our findings indicate that subduction-associated fluid migration has stimulated microbial activity in the mud reservoir and that mud volcanoes may contribute more substantially to the methane budget than previously estimated.

Published
2018

5. Deep-biosphere methane production stimulated by geofluids in the Nankai accretionary complex

Author

Ijiri, Akira, primary, Inagaki, Fumio, additional, Kubo, Yusuke, additional, Adhikari, Rishi R., additional, Hattori, Shohei, additional, Hoshino, Tatsuhiko, additional, Imachi, Hiroyuki, additional, Kawagucci, Shinsuke, additional, Morono, Yuki, additional, Ohtomo, Yoko, additional, Ono, Shuhei, additional, Sakai, Sanae, additional, Takai, Ken, additional, Toki, Tomohiro, additional, Wang, David T., additional, Yoshinaga, Marcos Y., additional, Arnold, Gail L., additional, Ashi, Juichiro, additional, Case, David H., additional, Feseker, Tomas, additional, Hinrichs, Kai-Uwe, additional, Ikegawa, Yojiro, additional, Ikehara, Minoru, additional, Kallmeyer, Jens, additional, Kumagai, Hidenori, additional, Lever, Mark A., additional, Morita, Sumito, additional, Nakamura, Ko-ichi, additional, Nakamura, Yuki, additional, Nishizawa, Manabu, additional, Orphan, Victoria J., additional, Røy, Hans, additional, Schmidt, Frauke, additional, Tani, Atsushi, additional, Tanikawa, Wataru, additional, Terada, Takeshi, additional, Tomaru, Hitoshi, additional, Tsuji, Takeshi, additional, Tsunogai, Urumu, additional, Yamaguchi, Yasuhiko T., additional, and Yoshida, Naohiro, additional

Published
2018
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7. Advances in the application of amino acid nitrogen isotopic analysis in ecological and biogeochemical studies

Author

Ohkouchi, Naohiko, primary, Chikaraishi, Yoshito, additional, Close, Hilary G., additional, Fry, Brian, additional, Larsen, Thomas, additional, Madigan, Daniel J., additional, McCarthy, Matthew D., additional, McMahon, Kelton W., additional, Nagata, Toshi, additional, Naito, Yuichi I., additional, Ogawa, Nanako O., additional, Popp, Brian N., additional, Steffan, Shawn, additional, Takano, Yoshinori, additional, Tayasu, Ichiro, additional, Wyatt, Alex S.J., additional, Yamaguchi, Yasuhiko T., additional, and Yokoyama, Yusuke, additional

Published
2017
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9. Presence of oxygen and aerobic communities from sea floor to basement in deep-sea sediments

Author

D'Hondt, Steven, Inagaki, Fumio, Zarikian, Carlos Alvarez, Abrams, Lewis J., Dubois, Nathalie, Engelhardt, Tim, Evans, Helen, Ferdelman, Timothy, Gribsholt, Britta, Harris, Robert N., Hoppie, Bryce W., Hyun, Jung-ho, Kallmeyer, Jens, Kim, Jinwook, Lynch, Jill E., Mckinley, Claire C., Mitsunobu, Satoshi, Morono, Yuki, Murray, Richard W., Pockalny, Robert, Sauvage, Justine, Shimono, Takaya, Shiraishi, Fumito, Smith, David C., Smith-duque, Christopher E., Spivack, Arthur J., Steinsbu, Bjorn Olav, Suzuki, Yohey, Szpak, Michal, Toffin, Laurent, Uramoto, Goichiro, Yamaguchi, Yasuhiko T., Zhang, Guo-liang, Zhang, Xiao-hua, Ziebis, Wiebke, D'Hondt, Steven, Inagaki, Fumio, Zarikian, Carlos Alvarez, Abrams, Lewis J., Dubois, Nathalie, Engelhardt, Tim, Evans, Helen, Ferdelman, Timothy, Gribsholt, Britta, Harris, Robert N., Hoppie, Bryce W., Hyun, Jung-ho, Kallmeyer, Jens, Kim, Jinwook, Lynch, Jill E., Mckinley, Claire C., Mitsunobu, Satoshi, Morono, Yuki, Murray, Richard W., Pockalny, Robert, Sauvage, Justine, Shimono, Takaya, Shiraishi, Fumito, Smith, David C., Smith-duque, Christopher E., Spivack, Arthur J., Steinsbu, Bjorn Olav, Suzuki, Yohey, Szpak, Michal, Toffin, Laurent, Uramoto, Goichiro, Yamaguchi, Yasuhiko T., Zhang, Guo-liang, Zhang, Xiao-hua, and Ziebis, Wiebke

Abstract

The depth of oxygen penetration into marine sediments differs considerably from one region to another. In areas with high rates of microbial respiration, O2 penetrates only millimetres to centimetres into the sediments, but active anaerobic microbial communities are present in sediments hundreds of metres or more below the sea floor. In areas with low sedimentary respiration, O2 penetrates much deeper but the depth to which microbial communities persist was previously unknown. The sediments underlying the South Pacific Gyre exhibit extremely low areal rates of respiration. Here we show that, in this region, microbial cells and aerobic respiration persist through the entire sediment sequence to depths of at least 75 metres below sea floor. Based on the Redfield stoichiometry of dissolved O2 and nitrate, we suggest that net aerobic respiration in these sediments is coupled to oxidation of marine organic matter. We identify a relationship of O2 penetration depth to sedimentation rate and sediment thickness. Extrapolating this relationship, we suggest that oxygen and aerobic communities may occur throughout the entire sediment sequence in 15–44% of the Pacific and 9–37% of the global sea floor. Subduction of the sediment and basalt from these regions is a source of oxidized material to the mantle.

Published
2015
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10. Presence of oxygen and aerobic communities from sea floor to basement in deep-sea sediments

Author

D’Hondt, Steven, primary, Inagaki, Fumio, additional, Zarikian, Carlos Alvarez, additional, Abrams, Lewis J., additional, Dubois, Nathalie, additional, Engelhardt, Tim, additional, Evans, Helen, additional, Ferdelman, Timothy, additional, Gribsholt, Britta, additional, Harris, Robert N., additional, Hoppie, Bryce W., additional, Hyun, Jung-Ho, additional, Kallmeyer, Jens, additional, Kim, Jinwook, additional, Lynch, Jill E., additional, McKinley, Claire C., additional, Mitsunobu, Satoshi, additional, Morono, Yuki, additional, Murray, Richard W., additional, Pockalny, Robert, additional, Sauvage, Justine, additional, Shimono, Takaya, additional, Shiraishi, Fumito, additional, Smith, David C., additional, Smith-Duque, Christopher E., additional, Spivack, Arthur J., additional, Steinsbu, Bjorn Olav, additional, Suzuki, Yohey, additional, Szpak, Michal, additional, Toffin, Laurent, additional, Uramoto, Goichiro, additional, Yamaguchi, Yasuhiko T., additional, Zhang, Guo-liang, additional, Zhang, Xiao-Hua, additional, and Ziebis, Wiebke, additional

Published
2015
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