东海及邻域的两条剖面地球物理反演与综合解释  

Inversion research for gravity and synthetical interpretation of two profiles in the area of East China Sea and its adjacency

作　　者：戴明刚[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029

出　　处：《地球物理学进展》2004年第2期331-340,共10页Progress in Geophysics

基　　金：国家自然科学基金项目(G20000467-01)赞助.

摘　　要：　根据东海及邻域的布格重力异常资料,在东海海域选择了中国大陆东部-东海陆架-冲绳海槽—琉球岛弧—琉球海沟的两条剖面,利用广义逆方法对两条剖面进行重力和磁力反演,结合其它地震等地球物理及地质资料,对剖面的地壳结构进行了综合研究,给出了相应的地质解释.在此基础上,对东海陆架盆地、冲绳海槽盆地的成因与性质,以及应力作用情况进行了探讨,认为冲绳海槽地壳的纵向结构是一种"二元结构";沟—弧—盆受的主应力方向为NW向;该区平面上地质地球物理现象的分块分带与纵向上的二元构成根本原因与菲律宾海板块和欧亚板块聚敛俯冲方向有关,还与两板块接触部位形状有关.In light with Bouguer gravity data in East China Sea, two profiles which cross Chinese Mainland, Shelf of East China Sea ,Okinawa Trough, Ryukyu Islands, and Ryukyu Trench are selected and are inverted for gravity and magnetic by the way of generalized inverses system of inversion for gravity and magnetic combine seismic and geological data, we synthetically studied two profiles crust structure , gave their homologous geologica interpretation . Based on these studies, we have discussed the crust structure in the study area, the origin and nature of Shelf of East China Sea and Okinawa Trough basin, and stress, and deemed crust structure of Okinawa Trough, which is a kind of 'dualisticstructure';Trench\|arc\|trough system received principal stress direction is NW ,and this area's geology and geophysics character which shows 'zones and pieces' in the floor plane and 'dualistic structure' in the vector plane is caused by not only subduction direction of Philippine Sea plate with Asian\|Europe plate, but also two plate's contact fringe shape.

关 键 词：东海及邻域 重磁反演 地壳结构 冲绳海槽 二元结构 

分 类 号：P738[天文地球—海洋地质]