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Geochemical constraints on the methane seep activity in western slope of the middle Okinawa Trough, the East China Sea

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Abstract

Anaerobic oxidation of methane and sulfate reduction was studied in the pore waters of four cores at two stations of the middle Okinawa Trough. Pore water vertical distributions of sulfate, methane, sulfide, total alkalinity, ammonium, and phosphate were determined in this study. Our results show strong linear sulfate concentration gradients of 6.83 mmol m−1 in Core A and 5.96 mmol m−1 in Core C, which were collected from two stations. Concurrent variations of methane, total alkalinity and hydrogen sulfide all exhibit steep increases with depth at both cores, which indicate active methane seep activities around two stations. Pore water ammonium and phosphate concentrations reveal minor influences of organic matter degradation on sulfate reduction at two stations. Sulfate methane interface (SMI) was extrapolated from linear sulfate profiles in methane seep cores. Shallower SMI depths (A: 4.9 mbsf; C: 5.4 mbsf) indicate strong methane fluxes and active anaerobic oxidation of methane in the underlying sediments.

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Authors and Affiliations

  1. State Key Laboratory of Gas Hydrates, Ministry of Land Resource, Qingdao, 266071, China

    Qing Li, Feng Cai, Jie Liang, Gang Dong, Feng Wang, ChuanSheng Yang & GaoWei Hu

  2. Qingdao Institute of Marine Geology, Qingdao, 266071, China

    Qing Li, Feng Cai, Jie Liang, Gang Dong, Feng Wang, ChuanSheng Yang & GaoWei Hu

  3. College of Marine Geosciences, Ocean University of China, Qingdao, 266100, China

    Jie Liang & ChuanSheng Yang

  4. School of Ocean and Earth Science, Tongji University, Shanghai, 200092, China

    HeBin Shao

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  1. Qing Li
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  2. Feng Cai
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  3. Jie Liang
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Correspondence to Feng Cai.

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Li, Q., Cai, F., Liang, J. et al. Geochemical constraints on the methane seep activity in western slope of the middle Okinawa Trough, the East China Sea. Sci. China Earth Sci. 58, 986–995 (2015). https://doi.org/10.1007/s11430-014-5034-x

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