南海海盆三维重力约束反演莫霍面深度及其特征

吴招才, 高金耀, 丁巍伟, 沈中延, 张涛, 杨春国. 2017. 南海海盆三维重力约束反演莫霍面深度及其特征. 地球物理学报, 60(7): 2599-2613, doi: 10.6038/cjg20170709
引用本文: 吴招才, 高金耀, 丁巍伟, 沈中延, 张涛, 杨春国. 2017. 南海海盆三维重力约束反演莫霍面深度及其特征. 地球物理学报, 60(7): 2599-2613, doi: 10.6038/cjg20170709
WU Zhao-Cai, GAO Jin-Yao, DING Wei-Wei, SHEN Zhong-Yan, ZHANG Tao, YANG Chun-Guo. 2017. Moho depth of the South China Sea basin from three-dimensional gravity inversion with constraint points. Chinese Journal of Geophysics (in Chinese), 60(7): 2599-2613, doi: 10.6038/cjg20170709
Citation: WU Zhao-Cai, GAO Jin-Yao, DING Wei-Wei, SHEN Zhong-Yan, ZHANG Tao, YANG Chun-Guo. 2017. Moho depth of the South China Sea basin from three-dimensional gravity inversion with constraint points. Chinese Journal of Geophysics (in Chinese), 60(7): 2599-2613, doi: 10.6038/cjg20170709

南海海盆三维重力约束反演莫霍面深度及其特征

  • 基金项目:

    国家自然科学基金项目(41676037),海洋二所基本科研业务费专项资金项目(JT1601),"全球变化与海气相互作用"专项(GASI-02-SCS-DWZP1,GASI-GEOGE-05、01),科学技术部科技基础性工作专项(2013FY112900),科技部重大仪器专项"海洋-航空重力仪研制"(2011YQ12004505)资助

详细信息
    作者简介:

    吴招才, 男, 1980年生, 博士, 从事海洋地球物理和海底构造研究.E-mail:wuzc@sio.org.cn

  • 中图分类号: P738

Moho depth of the South China Sea basin from three-dimensional gravity inversion with constraint points

  • 利用南海海盆及周边最新的重力,经过海底地形、沉积层的重力效应改正,并采用岩石圈减薄模型的温度场公式,校正了从张裂边缘到扩张海盆的热扰动重力效应.通过研究区的地震剖面和少量声呐数据得到的莫霍面深度点作为约束,采用基于"起伏界面初始模型"的深度修正量反演迭代公式,反演、计算了研究区的莫霍面深度及地壳厚度.结果表明,海盆区莫霍面深度在8~14 km之间,地壳厚度在3~9 km之间;东部海盆和西南海盆残留扩张中心沿NNE向展布向西南延伸至112°E,莫霍面深度超过12 km,地壳厚度在6 km以上,而西北海盆没有明显的增厚扩张中心;在西南海盆北缘的中沙地块南侧,存在一个近EW向地壳减薄带,地壳厚度在9~10 km;莫霍面深度14 km的等深线和地壳厚度9 km的等值线可指示洋陆边界位置.

  • 加载中
  • 图 1 

    研究区水深图

    Figure 1. 

    Topography and bathymetry of the South China Sea

    图 2 

    空间重力异常图

    Figure 2. 

    Map of free-air gravity anomalies

    图 3 

    沉积厚度图

    Figure 3. 

    Map of sediment thickness

    图 4 

    重力异常反演莫霍面深度流程

    Figure 4. 

    Flowchart of gravity inversion for determining Moho depth

    图 5 

    水层重力效应

    Figure 5. 

    Predicted attractions of the water-sediment interface

    图 6 

    沉积层重力效应

    Figure 6. 

    Predicted attractions of the sediment-crust interface

    图 7 

    热扰动重力效应

    Figure 7. 

    Effect of thermal gravity anomalies

    图 8 

    热校正后的布格重力异常

    Figure 8. 

    Bouguer anomalies after thermal correction

    图 9 

    已知点上布格重力异常和莫霍面深度的关系

    Figure 9. 

    Relationship of known Moho depth points and Bouguer anomalies

    图 10 

    莫霍面深度图

    Figure 10. 

    Map of Moho depths

    图 11 

    地壳厚度图

    Figure 11. 

    Map of crustal thickness

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出版历程
收稿日期:  2016-05-03
修回日期:  2016-06-23
上线日期:  2017-07-05

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