Stretching characteristics and its dynamic significance of the northern continental margin of South China Sea |
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| Authors: | Zhang YunFan Sun Zhen Zhou Di Guo XingWei Shi XiaoBin Wu XiangJie and Pang Xiong |
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| Institution: | (1) CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China;(2) Graduate University, Chinese Academy of Sciences, Beijing, 100049, China;(3) Qingdao Institute of Marine Geology, China Geological Survey, Qingdao, 266071, China;(4) China National Offshore Oil Corp. China Limited Shenzhen, Guangzhou, 510240, China |
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| Abstract: | To investigate the thinning of the whole crust, and the contribution of the upper versus lower crust to the stretching since Cenozoic, we calculated the stretching factor of the northern margin of South China Sea with data such as whole crustal thickness, depth of Cenozoic sedimentary basement and the horizontal displacement of faults. An isometric line drawing on whole crustal stretching factor is then obtained. Along the seismic Line 1530 in Baiyun sag, we also calculated the stretching factors of the upper and lower crust. The results suggest that the whole crustal thickness decreases seaward while the whole crustal stretching factor increases from shelf to slope. The Moho upwells highest beneath where the crust is thinned most. The value of the whole crustal stretching factor ranges from 1.5 to 6. Two areas were thinned intensely: the center of Yinggehai Basin, and the Baiyun sag in the Pearl River Mouth Basin. The calculation of the upper and lower crustal stretching factors from DSP1530 in Baiyun sag shows that the original crust of Baiyun sag should be thinned before deformation. Its pre-Cenozoic evolution as well as tectonic position during Cenozoic might be responsible for that. |
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| Keywords: | stretching factor the northern continental margin of South China Sea upper crust lower crust original hot thinned crust Baiyun sag |
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