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    南海西北次海盆及其邻区的地热流特征与研究

    徐行 王先庆 彭登 姚永坚 姚伯初 万志峰

    徐行, 王先庆, 彭登, 姚永坚, 姚伯初, 万志峰, 2018. 南海西北次海盆及其邻区的地热流特征与研究. 地球科学, 43(10): 3391-3398. doi: 10.3799/dqkx.2017.606
    引用本文: 徐行, 王先庆, 彭登, 姚永坚, 姚伯初, 万志峰, 2018. 南海西北次海盆及其邻区的地热流特征与研究. 地球科学, 43(10): 3391-3398. doi: 10.3799/dqkx.2017.606
    Xu Xing, Wang Xianqing, Peng Deng, Yao Yongjian, Yao Bochu, Wan Zhifeng, 2018. Characteristics and Research of Heat Flow in the Northwest Sub-Basin and Its Adjacent Areas of the South China Sea. Earth Science, 43(10): 3391-3398. doi: 10.3799/dqkx.2017.606
    Citation: Xu Xing, Wang Xianqing, Peng Deng, Yao Yongjian, Yao Bochu, Wan Zhifeng, 2018. Characteristics and Research of Heat Flow in the Northwest Sub-Basin and Its Adjacent Areas of the South China Sea. Earth Science, 43(10): 3391-3398. doi: 10.3799/dqkx.2017.606

    南海西北次海盆及其邻区的地热流特征与研究

    doi: 10.3799/dqkx.2017.606
    基金项目: 

    国家自然科学基金项目 91428205

    国家高技术研究发展计划(863计划) 2006AA09A203

    国家高技术研究发展计划(863计划) 2009AA09Z235

    国家自然科学基金项目 41376061

    详细信息
      作者简介:

      徐行(1963-), 男, 高级工程师, 从事地球物理探测和海洋地球物理技术方法研究

      通讯作者:

      王先庆

    • 中图分类号: P314

    Characteristics and Research of Heat Flow in the Northwest Sub-Basin and Its Adjacent Areas of the South China Sea

    • 摘要: 西北次海盆是南海海盆的一个重要构造单元,揭示西北次海盆的地热流特征对于整体认识南海海盆热状态和热结构至关重要.沿着OBS2006-1地震剖面采集的一批实测地热流数据显示,该热流探测剖面横穿南海北部陆坡、西北次海盆、中沙隆起、东部次海盆4个构造单元,结合地震解释剖面等资料对西北次海盆进行地热流特征分析及研究.结果表明:西北次海盆的平均热流密度值为104.5±9.9 mW/m2,与中沙隆起相邻的东部次海盆北部的平均热流密度值为97±2.5 mW/m2,热流密度值的空间变化与地幔埋深起伏相对应,并受地幔热源所控制;通过研究热流异常点,发现水深相近的相邻站位之间的海底表层沉积物温度差异是判别测站受海底地下水热循环影响程度和类型的依据之一;用最新海洋地热流探测成果,结合区域地质与地球物理资料,推测西北次海盆形成演化时代与西南次海盆相近,只是它的生命史比较短暂.

       

    • 图  1  南海西北次海盆构造位置与地热流测站分布

      a.研究区位置(白点为ODP或者IODP钻站位置,断线为海底磁异常条带);b.地热流测站分布

      Fig.  1.  The tectonic location of the NW sub-basin and the distribution of heat flow station

      图  2  沿SO49-18剖面的热流剖面

      Ding et al.(2012)吴振利等(2011)修改

      Fig.  2.  The heat flow profile along SO49-18 profile

      图  3  海底表层沉积物温度

      Fig.  3.  The temperatures of the seabed surface sediments

      图  4  海盆热流-洋壳年龄关图

      a.Parsons and Sclater(1977)的洋壳年龄与热流关系;b.实测热流与Briais et al.(1993)洋壳年龄关系曲线

      Fig.  4.  The relationship diagram of ocean basin heat flow and oceanic crust age

      表  1  HYIV20160829航次中的地热流测量结果

      Table  1.   The results of heat flow measurements in HYIV20160829 expedition

      站名 北纬(°) 东经(°) 水深(m) 海底水温(℃) 地温梯度(℃/km) 热导率(W/mK) 热流密度值(mW/m2) 探测深度(m)
      L01 19.083 5 114.350 1 1 341 3.364 73.7 0.936 68.9 4.0
      L02 18.583 3 114.600 1 3 620 2.342 140.8 0.797 112.2 4.0
      L03 18.316 8 114.716 7 3 644 2.337 133.0 0.801 106.5 4.0
      L04 18.083 5 114.816 8 3 705 2.372 10.1 0.810 8.2 4.0
      L04-1 18.050 0 114.833 5 3 700 2.369 58.5 0.806 47.2 4.0
      L05 17.850 0 114.950 1 3 708 2.365 135.4 0.851 115.2 4.0
      L06 17.566 8 115.066 8 3 703 2.370 113.6 0.820 93.1 4.0
      L07 17.333 5 115.166 7 2 198 2.521 85.7 0.826 70.7 4.0
      L08 17.100 1 115.300 1 2 336 2.449 29.6 0.826 24.4 4.0
      L09 16.816 8 115.416 7 3 956 2.396 111.5 0.885 98.7 4.0
      L10 16.583 4 115.550 1 4 077 2.418 116.1 0.820 95.2 4.0
      L11-1 16.500 0 115.616 7 4 109 2.410 157.7 0.909 143.4 4.0
      L12 18.000 0 114.583 5 3 585 2.363 117.8 0.811 95.5 4.0
      L13 18.200 1 114.766 8 3 625 2.354 18.4 0.808 14.9 4.0
        注:表中地温梯度值已经过角度校正,热导率值已经过温压校正.
      下载: 导出CSV
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