中国边缘海岩石层结构研究

本文以中国边缘海——东海与南海为研究对象，在体波与面波数据层析成像结果基础上，结合重磁及莫霍深度反演结果，对中国边缘海的地壳分布特点、岩石层结构进行了研究．同时对东海从陆区一直到琉球岛弧的地壳变化进行了总结与讨论，并提交了层析成像与位场反演的结果．认为中国东海地区的重力场具有“东西分带”的特点源于深部结构，而冲绳海槽盆地的形成应与大洋板块的俯冲后撤作用有密切关系．同时认为，菲律宾岛弧具有较特殊的结构，莫霍面下凹，上地幔顶部有较低速度的片状体存在，根据判断，南海与太平洋板块沿菲律宾岛弧在这里呈现出对冲的特点。

Research on the lithosphere structure of Chinese Marginal Seas

The research on the Moho distribution and lithosphere structure in Chinese Marginal Seas based on the tomography results from body and surface data and inversion result of gravity data in research area have been carried. The crust feature from Eastern China to Ryukyu Island Arc has been discussed in this paper. The tomography and gravity data inversion results have been shown too. We consider that the belted feature in longitude of gravity field in East China Sea region is root in the deep structure. We also believe the formation and evolution of Okinawa Through has affinity with the roll-back subduction of oceanic plate. The special structure in Philippine Island Arc is shown as the concave Moho interface and with low velocity slice in upper mantle. It is estimated that the South China Sea and Philippine Plate subduct face to face along Philippine Island Arc.