Thermal conductivity profilein the Nankaiaccretionary prism at IODP NanTroSEIZE Site C0002: estimationsfromhigh-pressure experiments using input site sediments

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  • Lin, Weiren
    Graduate School of Engineering, Kyoto University
  • Hirose, Takehiro
    Japan Agency for Marine‐Earth Science and Technology (JAMSTEC), Kochi Institute for Core Sample Research
  • Tadai, Osamu
    Marine Works Japan LTD
  • Tanikawa, Wataru
    Japan Agency for Marine‐Earth Science and Technology (JAMSTEC), Kochi Institute for Core Sample Research
  • Ishitsuka, Kazuya
    Graduate School of Engineering, Kyoto University
  • Yang, Xiaoqiu
    Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences･Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)
  • 林, 為人
  • 90756470

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  • Thermal Conductivity Profile in the Nankai Accretionary Prism at IODP NanTroSEIZE Site C0002: Estimations From High‐Pressure Experiments Using Input Site Sediments

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Depth profiles of sediment thermal conductivity are required for understanding the thermal structure in active seismogenic zones. During the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE), a scientific drilling project of the International Ocean Discovery Program (IODP), a borehole was penetrated to a depth of 3, 262.5 m below seafloor (mbsf) at Site C0002. Because core samples obtained from below ~1, 100 mbsf in an accretionary prism are limited, a thermal conductivity profile over such depths usually determined by laboratory measurements using core samples is not available. To obtain the thermal conductivity profile at Site C0002, we used core samples collected from sediments that overlay the incoming subducting oceanic basement at Nankai Trough Seismogenic Zone Experiment Site C0012, which can be considered to have the same mineral composition as the accretional prism at Site C0002. The thermal conductivity of the C0012 core samples was measured at high pressure to simulate subduction by reducing the sample porosity. We measured the thermal conductivity of six core samples from 144–518 mbsf at Site C0012 up to a maximum effective pressure of ~50 MPa, corresponding to depths greater than ~4 km below seafloor. We obtained an empirical relation between thermal conductivity λBulk in Wm⁻¹K⁻¹ and fractional porosity ϕ for the Nankai Trough accretionary prism as λBulk = exp(−1.09ϕ + 0.977). Based on porosity data measured using core/cuttings samples and data derived from P wave velocity logs, we estimate two consistent and complete thermal conductivity profiles down to ~3 km below seafloor in the Nankai Trough accretionary prism. These profiles are consistent with the existing thermal conductivity data measured using limited core samples.

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