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    南海北部陆缘的磁异常特征及居里面深度

    吴招才 高金耀 赵俐红 张涛 杨春国 王健

    吴招才, 高金耀, 赵俐红, 张涛, 杨春国, 王健, 2010. 南海北部陆缘的磁异常特征及居里面深度. 地球科学, 35(6): 1060-1068. doi: 10.3799/dqkx.2010.120
    引用本文: 吴招才, 高金耀, 赵俐红, 张涛, 杨春国, 王健, 2010. 南海北部陆缘的磁异常特征及居里面深度. 地球科学, 35(6): 1060-1068. doi: 10.3799/dqkx.2010.120
    WU Zhao-cai, GAO Jin-yao, ZHAO Li-hong, ZHANG Tao, YANG Chun-guo, WANG Jian, 2010. Characteristic of Magnetic Anomalies and Curie Point Depth at Northern Continental Margin of the South China Sea. Earth Science, 35(6): 1060-1068. doi: 10.3799/dqkx.2010.120
    Citation: WU Zhao-cai, GAO Jin-yao, ZHAO Li-hong, ZHANG Tao, YANG Chun-guo, WANG Jian, 2010. Characteristic of Magnetic Anomalies and Curie Point Depth at Northern Continental Margin of the South China Sea. Earth Science, 35(6): 1060-1068. doi: 10.3799/dqkx.2010.120

    南海北部陆缘的磁异常特征及居里面深度

    doi: 10.3799/dqkx.2010.120
    基金项目: 

    国家自然科学基金项目 41006035

    国家自然科学基金项目 40776036

    国家重点基础研究发展计划项目 2007CB411702

    我国近海海洋综合调查与评价专项 908-ZC-Ⅰ-06

    详细信息
      作者简介:

      吴招才(1980-),男,助研,博士,从事海洋地球物理和海底构造研究.E-mail: wzc_dh@163.com

    • 中图分类号: P631

    Characteristic of Magnetic Anomalies and Curie Point Depth at Northern Continental Margin of the South China Sea

    • 摘要: 为了研究南海北部张裂大陆边缘的地壳热结构,利用船载测量磁力数据,通过功率谱方法反演南海北部陆缘居里等温面,并结合深地震剖面、区域断裂及大地热流分布,讨论了深部热结构状态.结果显示研究区居里面深度在13~26 km之间,在上下陆坡转换带处与莫霍面相交,北东向断裂多位于居里面梯度带上,北西向断裂多具有分割、错断的特点,居里面深度和大地热流值具有相关性.结果揭示了陆架、上陆坡地区磁性体可能主要位于上地壳和下地壳上部,下陆坡及洋壳区地壳与地幔顶部有被磁化的迹象.磁静区位于居里面上隆区边缘,F3断裂和F4断裂之间可能是残留古洋壳.潮汕凹陷和台西南盆地中央隆起是发生底侵的主要区域,F2断裂为其北界.

       

    • 图  1  南海北部陆缘磁异常(△T)

      Fig.  1.  Magnetic anomalies of the Northeast South China Sea

      图  2  频谱分析

      虚线、点划线和实线依次是四阶、五阶和六阶细节的平均径向能谱曲线

      Fig.  2.  Map of spectral analysis

      图  3  南海北部陆缘磁异常四阶小波细节

      Fig.  3.  4th-order wavelet detail of magnetic anomalies

      图  4  居里面深度

      Fig.  4.  Curie point isotherms

      图  5  OBS93速度结构剖面与重磁、居里面深度及大地热流值对照

      Fig.  5.  OBS93 velocity section and its magnetic anomaly, Curie point isotherms and heat flow profile

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    • 收稿日期:  2010-03-20
    • 刊出日期:  2010-11-01

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