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Geochemistry of pore waters from the Xisha Trough, northern South China Sea and their implications for gas hydrates

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Abstract

This paper reports all available geochemical data on sediments and pore waters from the Xisha Trough on the northern continental margin of the South China Sea. The methane concentrations in marine sediments display a downhole increasing trend and their carbon isotopic compositions (δ 13C = −25 to −51‰) indicate a thermogenic origin. Pore water Cl− concentrations show a range from 537 to 730 mM, and the high Cl− samples also have higher concentrations of Br−, Na+, K+, and Mg2+, implying mixing between normal seawater and brine in the basin. The SO4 2− concentrations of pore waters vary from 19.9 to 36.8 mM, and show a downhole decreasing trend. Calculated SMI (sulfate-methane interfaces) depths and sulfate gradients are between 21 and 47 mbsf, and between −0.7 and −1.7 mM/m, respectively, which are similar to values in gas hydrate locations worldwide and suggest a high methane flux in the basin. Overall, the geochemical data, together with geological and geophysical evidence, such as the high sedimentation rates, high organic carbon contents, thick sediment piles, salt and mud diapirs, active faulting, abundant thermogenic gases, and occurrence of huge bottom simulating reflector (BSR), are suggestive of a favorable condition for occurrence of gas hydrates in this region.

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Authors and Affiliations

  1. State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing, 210093, China

    Shao-Yong Jiang, Tao Yang, Lu Ge, Jing-Hong Yang & Hong-Fei Ling

  2. Research Center for Marine Geochemistry, Nanjing University, Nanjing, 210093, China

    Shao-Yong Jiang, Tao Yang, Lu Ge, Jing-Hong Yang, Hong-Fei Ling & Dao-Hua Chen

  3. Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou, 510760, China

    Neng-You Wu, Jian Liu & Dao-Hua Chen

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  1. Shao-Yong Jiang
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Correspondence to Shao-Yong Jiang.

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Jiang, SY., Yang, T., Ge, L. et al. Geochemistry of pore waters from the Xisha Trough, northern South China Sea and their implications for gas hydrates. J Oceanogr 64, 459–470 (2008). https://doi.org/10.1007/s10872-008-0039-8

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  • DOI: https://doi.org/10.1007/s10872-008-0039-8

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