Tectonics in the Northwestern West Philippine Basin  

作　　者：倪祥龙 吴时国 Shinjo Ryuichi 

机构地区：[1]Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences,Qingdao 266071 [2]Research Institute of Petroleum Exploration ＆ Development-Northwest （NWGI）,PetroChina, Lanzhou 730020 China [3]Graduate University of Chinese Academy of Sciences, Beijing 100049, China [4]Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China [5]China University of Petroleum （Huadong）, Qingdao 266555, China [6]Department of Physics and Earth Sciences, University of the Ryukyus Senbaru-1 Nishihara, Okinawa 903-0213, Japan

出　　处：《Journal of China University of Geosciences》2008年第3期191-199,共9页中国地质大学学报（英文版）

基　　金：Project of China Ocean Mineral Resource Association, the Knowledge Innovation Project of the Chinese Academy of Sciences (No. KZCX3-SW-224);the Taishan Scholarship Project of Shandong Province, the National Natural Science Foundation of China (No. 40276022);Japan Science Promotion Societion Program.

摘　　要：The West Philippine basin （WPB） is a currently inactive marginal basin belonging to Philippine Sea plate, which has a complex formation history and various crust structures. Based on gravity, magnetic and seismic data, the tectonics in West Philippine basin is characterized by amagma spreading stage and strike slip fractures. NNE trending Okinawa-Luzon fracture zone is a large fracture zone with apparent geomorphology and shows a right-handed movement. The results of joint gravity-magnetic-seismic inversion suggest that the Okinawa-Luzon fracture zone has intensive deformation and is a transform fault. Western existence of the NW trending fractures under Ryukyu Islands Arc is the main cause of the differences between south and north Okinawa Trough. The Urdaneta plateau is not a remained arc, but remnant of mantle plume although its lava chemistry is similar to oceanic island basalt （OIB）.The West Philippine basin （WPB） is a currently inactive marginal basin belonging to Philippine Sea plate, which has a complex formation history and various crust structures. Based on gravity, magnetic and seismic data, the tectonics in West Philippine basin is characterized by amagma spreading stage and strike slip fractures. NNE trending Okinawa-Luzon fracture zone is a large fracture zone with apparent geomorphology and shows a right-handed movement. The results of joint gravity-magnetic-seismic inversion suggest that the Okinawa-Luzon fracture zone has intensive deformation and is a transform fault. Western existence of the NW trending fractures under Ryukyu Islands Arc is the main cause of the differences between south and north Okinawa Trough. The Urdaneta plateau is not a remained arc, but remnant of mantle plume although its lava chemistry is similar to oceanic island basalt （OIB）.

关 键 词：TECTONICS amagma spreading gravity anomaly magnetic anomaly West Philippine basin. 

分 类 号：P542[天文地球—构造地质学]