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《Chinese Journal of Geophysics》 2011-12
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Cenozoic evolution model of the sea-floor spreading in South China Sea:new constraints from high resolution geophysical data

LI Jia-Biao~(1,2),DING Wei-Wei~(1,2),GAO Jin-Yao~(1,2),WU Zi-Yin~(1,2),ZHANG Jie~(1,2) 1 Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China 2 Key Laboratory of Submarine Geoscience,State Oceanic Administration,Hangzhou 310012,China  
Based on investigations of the new high resolution gravity and magnetic data,combined with swath bathymetry,the Cenozoic evolution model of the South China Sea is revisied.Two major sea-floor spreading stages were revealed with different dynamic mechanisms,separated by a remarkable tectonic-sedimentary event near 25 Ma.Sea-floor spreading started firstly in the East and Northwest Sub-basins from~33.5 Ma to 25 Ma,and formed the original oceanic crust with E-W or NEE-oriented magnetic anomalies in the northern and southern side of the East Sub-basin nowadays and whole Northwest Sub-basin.Since 25 Ma the sea-floor spreading continued with different direction until 16.5 Ma.The later NW-SE-oriented spreading made the NE oriented magnetic anomalies in the central East Sub-basin and Southwest Sub-basin.Different tectonic areas developed during these two spreading episodes in the oceanic basin.The whole oceanic basin could be divided into three subregions from north to south.The northern and southern subregions are related to the first episodic sea-floor spreading,while the central one was formed during the later sea-floor spreading.And the central subregion could be separated into six segments further bounded with NW-NNW-oriented transform faults.Evidence from magnetic anomalies showed that the sea-floor spreading in the later episode began in the east segments with C6c anomaly(23.5 Ma),and continued with C6b(22.8 Ma) in the middle segments and with C5e(18.5 Ma) in the west.We indicated that between 25 Ma and 16.5 Ma,the central part of the East Sub-basin and Southwest Sub-basin experienced rifting propagation from east to west, and the spreading direction changed in each segment.A NNW-trending transform fault separated the East and Southwest Sub-basins.It not only cuts the magnetic anomalies with different directions,but also makes a nearly 95 km sinistral offset of the spreading ridge.Before the collision of the Luzon arc with and Eurasia Plate,the South China Sea was a gulf-shape marginal sea opening to the Pacific Ocean,resulting from westward propagation of a spreading center inside the Sunda Continent,as in the case of the western Gulf of Aden.
【Fund】: 国家重点基础研究发展计划(973计划)(2007CB411704);; 国家自然科学基金重点课题(91028006)资助
【CateGory Index】: P736.1
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