TY  - GEN
A1  - Ijiri, Akira
A1  - Inagaki, Fumio
A1  - Kubo, Yusuke
A1  - Adhikari, Rishi Ram
A1  - Hattori, Shohei
A1  - Hoshino, Tatsuhiko
A1  - Imachi, Hiroyuki
A1  - Kawagucci, Shinsuke
A1  - Morono, Yuki
A1  - Ohtomo, Yoko
A1  - Ono, Shuhei
A1  - Sakai, Sanae
A1  - Takai, Ken
A1  - Toki, Tomohiro
A1  - Wang, David T.
A1  - Yoshinaga, Marcos Y.
A1  - Arnold, Gail L.
A1  - Ashi, Juichiro
A1  - Case, David H.
A1  - Feseker, Tomas
A1  - Hinrichs, Kai-Uwe
A1  - Ikegawa, Yojiro
A1  - Ikehara, Minoru
A1  - Kallmeyer, Jens
A1  - Kumagai, Hidenori
A1  - Lever, Mark Alexander
A1  - Morita, Sumito
A1  - Nakamura, Ko-ichi
A1  - Nakamura, Yuki
A1  - Nishizawa, Manabu
A1  - Orphan, Victoria J.
A1  - Røy, Hans
A1  - Schmidt, Frauke
A1  - Tani, Atsushi
A1  - Tanikawa, Wataru
A1  - Terada, Takeshi
A1  - Tomaru, Hitoshi
A1  - Tsuji, Takeshi
A1  - Tsunogai, Urumu
A1  - Yamaguchi, Yasuhiko T.
A1  - Yoshida, Naohiro
T1  - Deep-biosphere methane production stimulated by geofluids in the Nankai accretionary complex
T2  - Postprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe
N2  - 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 the methane budget than previously estimated.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 802 
KW  - multiply-substituted isotopologues
KW  - marine subsurface sediments
KW  - carbon isotopic composition
KW  - submarine mud volcano
KW  - intact polar lipids
KW  - fore-arc basin
KW  - subseafloor sediments
KW  - microbial lipids
KW  - Cascadia margin
KW  - organic-acids
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-427002
SN  - 1866-8372
IS  - 802
ER  -