摘要
依据东海南部一条自东海陆架直至菲律宾海盆的重磁地震综合探测剖面 ,采用地壳结构重磁地震综合反演解释系统开展岩石圈结构的综合研究 ,制作了岩石圈结构地学断面图 .结果表明基隆凹陷为一中新生代沉积凹陷 ,沉积厚度达到 14km ;冲绳海槽盆地为弧后扩张地堑型盆地 ,地壳厚度仅为 14 .5km ;菲律宾板块沿北西西方向向欧亚板块俯冲 ,莫霍面急剧下插 ,导致冲绳海槽的形成与发展 ;岩石圈厚度约为 80km ,但在 370km处仅为 5 3km ,在 4 5 0km至 5 4 0km处岩石圈厚度大于 10 0km .
We apply the comprehensive inversion and interpretation method of gravitative, magnetic and seismic data for crustal structure to the study of lithospheric structure beneath the East China Sea. This study is based on a gravitative-magnetic and seismic survey profile which extends from the East China Sea shelf to the Phillipine basin. As result we make geortransect map of the lithospheric structure for this area. The map shows that the Jilong depression (near Taiwan) is a Mesozoic-Cenozoic sedimentary basin where the sediment is 14km thick. The Okinawa trough basin is of the back arc extentional graben type with crustal thickness of merely 14.5km. The Phillipine plate under thrusts dives toward the Eurasia plate in NWW direction, resulting in steep Moho interface and formation and development of the Okinawa trough, where the lithosphere is about 80km thick. But at other positions on the profile, the lithospheric thickness varies. For instance it is 53km at the site 370km and more than 100km at the site from 450km to 540km on the profile.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第5期853-861,共9页
Chinese Journal of Geophysics
基金
国家高技术研究发展 ( 863 )计划资助项目 ( 82 0 -0 1-0 3 )
关键词
重磁地震综合探测
地学断面
岩石圈
东海
The East China Sea, Gravity-magnetic and seismic comprehensive survey, Geological transect, Lithosphere.
