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    台湾海峡及邻区剖面岩石圈有效弹性厚度及其构造意义

    王明明 吴健生

    王明明, 吴健生, 2017. 台湾海峡及邻区剖面岩石圈有效弹性厚度及其构造意义. 地球科学, 42(10): 1707-1714. doi: 10.3799/dqkx.2017.524
    引用本文: 王明明, 吴健生, 2017. 台湾海峡及邻区剖面岩石圈有效弹性厚度及其构造意义. 地球科学, 42(10): 1707-1714. doi: 10.3799/dqkx.2017.524
    Wang Mingming, Wu Jiansheng, 2017. Lithosphere Effective Elastic Thickness and Its Tectonic Implications in Taiwan Strait and Its Adjacent Regions. Earth Science, 42(10): 1707-1714. doi: 10.3799/dqkx.2017.524
    Citation: Wang Mingming, Wu Jiansheng, 2017. Lithosphere Effective Elastic Thickness and Its Tectonic Implications in Taiwan Strait and Its Adjacent Regions. Earth Science, 42(10): 1707-1714. doi: 10.3799/dqkx.2017.524

    台湾海峡及邻区剖面岩石圈有效弹性厚度及其构造意义

    doi: 10.3799/dqkx.2017.524
    基金项目: 

    中国海及邻域地质地球物理系列图项目 GZH200900504

    国家高技术研究发展计划(863计划)项目 2010AA09Z302

    国家自然科学基金项目 41541027

    详细信息
      作者简介:

      王明明(1987-),男,博士生,主要研究方向为综合地球物理

      通讯作者:

      吴健生

    • 中图分类号: P312.3

    Lithosphere Effective Elastic Thickness and Its Tectonic Implications in Taiwan Strait and Its Adjacent Regions

    • 摘要: 台湾海峡及邻区地处欧亚板块与菲律宾海板块相互作用的构造前锋部位,经历了挤压、剪切和伸展交替或并重的构造作用,这种复杂应力环境下岩石圈的均衡调整对台湾地区的构造演化具有深远影响.通过采用均衡响应函数法计算穿越台湾海峡及邻区剖面岩石圈的有效弹性厚度,利用剥离法消除台湾海峡及东邻岛区较厚沉积层的影响,得到了穿越台湾海峡地区剖面岩石圈弹性厚度的变化.结合反演的莫霍面和居里面深度对剖面有效弹性厚度的构造意义进行了综合分析.结果表明:台湾海峡及邻区岩石圈有效弹性厚度变化范围为22~8 km,剖面有效弹性厚度整体上自西往东呈楔形递减趋势,反映中国东部大陆岩石圈往东伸展减薄;台湾岛附近有效弹性厚度出现局部向东倾斜增大的趋势,可能与东侧菲律宾海板块的仰冲挤压有关.有效弹性厚度与居里面具有较高相关性,反映了有效弹性厚度受岩石圈热结构的影响.

       

    • 图  1  剖面位置

      Fig.  1.  Profile position

      图  2  剖面地形

      Fig.  2.  Topography profile

      图  3  剖面重力与磁力异常

      Fig.  3.  Gravity and magnetic anomalies profile

      图  4  理论均衡响应函数曲线

      Fig.  4.  Theoretical isostatic response function curve

      图  5  各区段地形和重力异常

      Fig.  5.  Topography and gravity anomalies of each section

      图  6  各区段均衡响应函数

      Fig.  6.  Isostatic response function of each section

      图  7  台湾岛深部构造示意

      曾佐勋等(2013)修改

      Fig.  7.  Deep geological structure of Taiwan Island

      图  8  各区段岩石圈有效弹性厚度值

      Fig.  8.  Te values of different sections

      图  9  有效弹性厚度与居里面和莫霍面深度剖面

      Fig.  9.  Changes of Te, Curie depth and Moho depth

      表  1  模型计算中用到的参数

      Table  1.   Parameters used by the flexural model

      参数 定义 值/单位
      D 挠曲刚度 N·m
      Te 有效弹性厚度 km
      ρw 海水密度 1 030 kg/m3
      ρs 沉积层密度 2 000 kg/m3
      ρc 地壳密度 2 670 kg/m3
      ρm 地幔密度 3 270 kg/m3
      g 重力加速度 9.8 m/s2
      E 杨氏模量 8.0×1010 Pa
      μ 泊松比 0.25
      下载: 导出CSV
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