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首頁(yè)> 外文期刊>Oceanographic Literature Review >Thermal Conductivity Profile in the Nankai Accre-tionary Prism at IODP NanTroSEIZE Site C0002: Estimations From High-Pressure Experiments Using Input Site Sediments
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Thermal Conductivity Profile in the Nankai Accre-tionary Prism at IODP NanTroSEIZE Site C0002: Estimations From High-Pressure Experiments Using Input Site Sediments

機(jī)譯：IODP Nantroseize位點(diǎn)的南開(kāi)歸因棱鏡中的導(dǎo)熱曲線C0002：使用輸入部位沉積物的高壓實(shí)驗(yàn)估計(jì)

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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 ac-cretional 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 λ_(Bulk) in Wm~(-1)K~(-1) and fractional porosity Φ for the Nankai Trough accretionary prism as λ_(Bulk)= 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.
機(jī)譯：理解活性發(fā)電區(qū)中的熱結(jié)構(gòu)需要沉積物導(dǎo)熱率的深度輪廓。在南開(kāi)槽地區(qū)原始區(qū)實(shí)驗(yàn)（Nantroseize），國(guó)際海洋發(fā)現(xiàn)程序（IODP）的科學(xué)鉆探項(xiàng)目，鉆孔滲透到位點(diǎn)C0002的海底（MBSF）以下3,262.5米的深度。因?yàn)樵谠鲐?fù)棱鏡中獲得的核心樣本在低于?1,100mbsf的限制中，因此不可用通常通過(guò)使用核心樣品的實(shí)驗(yàn)室測(cè)量確定的這種深度的導(dǎo)熱曲線。為了獲得位點(diǎn)C0002的導(dǎo)熱曲線，我們使用從沉積物中收集的核樣品，該沉積物覆蓋南開(kāi)槽地區(qū)原始區(qū)域C0012的進(jìn)入的底層海洋地下室C0012，這可以被認(rèn)為具有與AC的交流棱鏡相同的礦物組合物網(wǎng)站C0002。通過(guò)降低樣品孔隙度，在高壓下測(cè)量C0012核心樣品的導(dǎo)熱率以模擬俯沖。我們將六個(gè)核心樣品的導(dǎo)熱率從位點(diǎn)C0012的144-518 MBSF測(cè)量到最大有效壓力?50MPa，對(duì)應(yīng)于海底大于?4公里的深度。我們?cè)赪m?（-1）K?（-1）中的導(dǎo)熱率λ_（批量）與南開(kāi)槽的分?jǐn)?shù)孔隙φ之間的實(shí)證關(guān)系，用于λ_（散裝）= exp（-1.09φ+ 0.977）?；谑褂煤诵?切割樣品和來(lái)自P波速度日志的數(shù)據(jù)測(cè)量的孔隙率數(shù)據(jù)，我們?cè)谀祥_(kāi)槽占棱鏡中估計(jì)兩個(gè)一致而完整的導(dǎo)熱率下降至?3公里。這些型材與使用有限核心樣本測(cè)量的現(xiàn)有的導(dǎo)熱性數(shù)據(jù)一致。

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  • 來(lái)源
    《Oceanographic Literature Review》 |2020年第9期|1950-1950|共1頁(yè)
  • 作者

    W. Lin; T. Hirose; O. Tadai;

  • 作者單位

    Graduate School of Engineering Kyoto University Kyoto Japan;

    Graduate School of Engineering Kyoto University Kyoto Japan;

    Graduate School of Engineering Kyoto University Kyoto Japan;

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