Deep-biosphere methane production stimulated by geofluids in the Nankai accretionary complex.
Deep-biosphere methane production stimulated by geofluids in the Nankai accretionary complex.
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DOI：
10.1126/sciadv.aao4631
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发表时间：
2018-06
期刊：
影响因子：
13.6
通讯作者：
Yoshida N
中科院分区：
文献类型：
--
作者：
Ijiri A;Inagaki F;Kubo Y;Adhikari RR;Hattori S;Hoshino T;Imachi H;Kawagucci S;Morono Y;Ohtomo Y;Ono S;Sakai S;Takai K;Toki T;Wang DT;Yoshinaga MY;Arnold GL;Ashi J;Case DH;Feseker T;Hinrichs KU;Ikegawa Y;Ikehara M;Kallmeyer J;Kumagai H;Lever MA;Morita S;Nakamura KI;Nakamura Y;Nishizawa M;Orphan VJ;Røy H;Schmidt F;Tani A;Tanikawa W;Terada T;Tomaru H;Tsuji T;Tsunogai U;Yamaguchi YT;Yoshida N
在海底泥火山进行的科学钻探表明，地球流体的迁移刺激了生物圈深处的甲烷生成。生活在海底沉积物中的微生物在地球碳循环中扮演着重要的角色。然而，地球动力学过程对海底生物的分布和碳循环活动的影响仍然没有得到很好的约束。我们通过钻探到山顶下200米处，探索了南开增生杂岩的一座海底泥火山。水和碳化合物的稳定同位素组成，包括块状甲烷同位素，表明~90%的甲烷是在16°~30°C和海底300~900m处微生物产生的，对应于盆地底部，那里的吸积棱柱中的流体通过巨型断裂提供。放射性示踪实验表明，深泥火山沉积物(10 2~10 3cell cm−3)中的微生物种群相对较少，包括活性较高的产氢产甲烷菌和乙酸菌。我们的发现表明，俯冲相关的流体迁移刺激了泥岩储集层中的微生物活动，泥火山对甲烷收支的贡献可能比之前估计的更大。
Scientific drilling at a submarine mud volcano shows that geofluid migration stimulates methanogenesis in the deep biosphere. 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.
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影响因子：
18.3
作者：
Joye, Samantha B.;Samarkin, Vladimir A.;Meile, Christof D.
通讯作者：
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影响因子：
5.2
作者：
Adhikari RR;Glombitza C;Nickel JC;Anderson CH;Dunlea AG;Spivack AJ;Murray RW;D'Hondt S;Kallmeyer J
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5.2
作者：
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影响因子：
4.2
作者：
CONRAD, R;BAK, F;SCHUTZ, H
通讯作者：
SCHUTZ, H