Akira Ijiri, Fumio Inagaki, Yusuke Kubo, Rishi Ram Adhikari, Shohei Hattori, Tatsuhiko Hoshino, Hiroyuki Imachi, Shinsuke Kawagucci, Yuki Morono, Yoko Ohtomo, Shuhei Ono, Sanae Sakai, Ken Takai, Tomohiro Toki, David T. Wang, Marcos Y. Yoshinaga, Gail L. Arnold, Juichiro Ashi, David H. Case, Tomas Feseker, Kai-Uwe Hinrichs, Yojiro Ikegawa, Minoru Ikehara, Jens Kallmeyer, Hidenori Kumagai, Mark Alexander Lever, Sumito Morita, Ko-ichi Nakamura, Yuki Nakamura, Manabu Nishizawa, Victoria J. Orphan, Hans Røy, Frauke Schmidt, Atsushi Tani, Wataru Tanikawa, Takeshi Terada, Hitoshi Tomaru, Takeshi Tsuji, Urumu Tsunogai, Yasuhiko T. Yamaguchi, Naohiro Yoshida
- 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 (10 2 to 10 3 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 theMicrobial 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 (10 2 to 10 3 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.…
MetadatenAuthor details: | Akira IjiriORCiD, Fumio InagakiORCiD, Yusuke Kubo, Rishi Ram AdhikariORCiDGND, Shohei HattoriORCiD, Tatsuhiko Hoshino, Hiroyuki ImachiORCiD, Shinsuke KawagucciORCiD, Yuki MoronoORCiD, Yoko OhtomoORCiD, Shuhei Ono, Sanae Sakai, Ken TakaiORCiD, Tomohiro TokiORCiD, David T. Wang, Marcos Y. YoshinagaORCiD, Gail L. Arnold, Juichiro Ashi, David H. Case, Tomas FesekerGND, Kai-Uwe HinrichsORCiDGND, Yojiro IkegawaORCiD, Minoru IkeharaORCiD, Jens KallmeyerORCiDGND, Hidenori KumagaiORCiD, Mark Alexander LeverORCiD, Sumito MoritaORCiD, Ko-ichi Nakamura, Yuki Nakamura, Manabu Nishizawa, Victoria J. OrphanORCiD, Hans RøyORCiD, Frauke SchmidtORCiDGND, Atsushi Tani, Wataru TanikawaORCiD, Takeshi Terada, Hitoshi Tomaru, Takeshi TsujiGND, Urumu TsunogaiORCiD, Yasuhiko T. YamaguchiORCiD, Naohiro YoshidaORCiD |
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URN: | urn:nbn:de:kobv:517-opus4-427002 |
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DOI: | https://doi.org/10.25932/publishup-42700 |
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ISSN: | 1866-8372 |
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Title of parent work (English): | Postprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe |
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Publication series (Volume number): | Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe (802) |
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Publication type: | Postprint |
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Language: | English |
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Date of first publication: | 2019/12/18 |
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Publication year: | 2018 |
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Publishing institution: | Universität Potsdam |
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Release date: | 2019/12/18 |
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Tag: | Cascadia margin; carbon isotopic composition; fore-arc basin; intact polar lipids; marine subsurface sediments; microbial lipids; multiply-substituted isotopologues; organic-acids; submarine mud volcano; subseafloor sediments |
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Issue: | 802 |
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Number of pages: | 16 |
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Source: | Science advances 4 (2018) 6 DOI: 10.1126/sciadv.aao4631 |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 50 Naturwissenschaften / 500 Naturwissenschaften und Mathematik |
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Peer review: | Referiert |
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Publishing method: | Open Access |
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License (German): | CC-BY-NC - Namensnennung, nicht kommerziell 4.0 International |
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External remark: | Bibliographieeintrag der Originalveröffentlichung/Quelle |
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