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Mesozoic subduction-accretion zone in northeastern south{1. sea inferred from geophysical interpretations

Science china Earth {1. 2006年第5期49卷 471-482页

作者： zhou di1, wang wanyin2. wang jialin3, pang xiong4, cai dongsheng5 & sun zhen1 1. key laboratory of marginal sea geology, south china sea institute of oceanology, chinese academy of sciences, guang- zhou 510301, china 2. College of Geological and Topographical Engineering, Chang’an University, Xi’an 710054, china 3. key laboratory of Marine geology, Tongji University, Shanghai 200092, china 4. china National Offshore Oil Co. Limited – Shenzhen Branch, Shenzhen 518067, china 5. china National Offshore Oil Co. Limited – Research Center, Beijing 100027, china 1. key {1. of marginal sea geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China 2. College of Geological and Topographical Engineering Chang’an University Xi’an 710054 China 3. key {1. of Marine geology Tongji University Shanghai 200092 China 4. china National Offshore Oil Co. Limited — Shen{1. Branch Shenzhen 518067 China 5. china National Offshore Oil Co. Limited — Re{1.rch Center Beijing 100027 China

A segment of Mesozoic subduction-accretion zone was inferred across thenortheastern south{1. sea at approximately NE450 orientation. Basic evidence includes thefollowing: A belt of peek gross horizontal Bouguer gravity gradient (PGHGBA) is comparable in sizeand intensity to that of the Manila subduction-accretion zone. A belt of high positive magneticanomalies appears to the north and sub-parallel to the PGHGBA, representing the volcanic arcassociated to the subduction zone. The PGHGBA crosses obliquely both Cenozoic structures and presentseafloor topography, indicating a pre-Cenozoic age. The segment is offset left-laterally byNW-running strike-slip faults, in concord with the Mesozoic stress field of south{1.. Inaddition, the existence of the subduction zone is supported by wide-angle seismic data obtained indifferent years by different institutions. At approximate localities, a north-dipping ramp of Mohosurface is indicated by records of ocean-bottom seismometers, and a strong reflector about 8 kmbeneath the Moho reflector is indicated by both OBS and long-cable seismic records. Theidentification of a segment of Mesozoic subduction zone in NE south{1. sea fills nicely the gapof the Great Late Mesozoic Circum SE Asia Subduction-acrretion Zone, which extended from Sumatra,Java, SE Kalimantan to N Palawan, and from Taiwan, Ryukyu to SW Japan.

关键词： Mesozoic, subduction zone, SE Asia, NE south china sea, geophysics.

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