期刊
SCIENCE ADVANCES
卷 4, 期 6, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aao4631
关键词
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资金
- Japan Society for the Promotion of Science (JSPS) Strategic Fund for Strengthening Leading-Edge Research and Development
- JSPS Funding Program for Next Generation World-Leading Researchers [GR102]
- East Asia and Pacific Summer Institutes program through the NSF [1308171]
- East Asia and Pacific Summer Institutes program through JSPS [1308171]
- European Research Council under the European Union's Seventh Framework Programme-Ideas Specific Programme [247153]
- [23681007]
- [26287128]
- [17H01871]
- [26251041]
- [17H06105]
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 similar to 90% of methane is microbially produced at 16 degrees to 30 degrees 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.
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