Cenozoic tectono-sedimentary characteristics and extension model of the Northwest Sub-basin,South China Sea

查看全文 作　　者：Weiwei [1]Ding;Mingbi [1]Li;Lihong [2]Zhao;Aiguo [1]Ruan;Zhenli [1]Wu

机构地区：[1]Key Laboratory of the Submarine Geoscience, State Oceanic Administration, 32# North Baochu Road, Hangzhou 310012, China;[2]Shandong University of Science and Technology, Qingdao 266510, China

出　　处：《Geoscience Frontiers》索引2011年第2卷第4期,共9页

基　　金：supported by the National Basic Research Program(973) of China (No.2007CB41170403);the National Natural Science Foundation of China(No.40806023);the Scientific Research Fund of the SIO,SOA(No.1404-10) 摘　　要：Based on the interpretations of three seismic profiles and one wide-angle seismic profile across the Northwest Sub-basin,South China Sea.stratigraphic sequences,deformation characteristics and an extension model for this sub-basin have been worked out.Three tectonic-stratigraphic units are determined.Detailed analyses of extension show that the event occurred mainly during the Paleogene and resulted in the formation of half-grabens or grabens distributed symmetrically around the spreading center.Sediments are characterized by chaotic and discontinuous reflectors,indicating clastic sediments. Farther to the southwest,the sub-basin features mainly continental rifting instead of sea-floor spreading. The rifting would have been controlled by the shape of the massif and developed just along the northern edge of the Zhongsha-Xisha Block,rather than joined the Xisha Trough.After 25 Ma.a southward ridge jump triggered the opening of the Southwest Sub-basin.The NW-directed stress caused by the sea-floor spreading of the Northwest Sub-basin may have prevented the continuous opening of the sub-basin.After that the Northwest Sub-basin experienced thermal cooling and exhibited broad subsidence.The deep crustal structure shown by the velocity model from a wide-angle seismic profile is also symmetrical around the spreading center,which indicates that the Northwest Sub-basin might have opened in a pure shear model. 关键词：碎屑沉积物中国南海新生代构造西北扩展模型盆地特征和地震剖面

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Cenozoic tectono-sedimentary characteristics and extension model of the Northwest Sub-basin,South China Sea

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