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Cenozoic tectonic subsidence in the Southern Continental Margin, South China Sea |
Penggao FANG1, Weiwei DING1( ), Yinxia FANG1, Zhongxian ZHAO2, Zhibing FENG3 |
1. The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China 2. South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China 3. College of Marine Geoscience, Ocean University of China, Qingdao 266100, China |
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Abstract We analyzed two recently acquired multichannel seismic profiles across the Dangerous Grounds and the Reed Bank area in the South China Sea. Reconstruction of the tectonic subsidence shows that the southern continental margin can be divided into three stages with variable subsidence rate. A delay of tectonic subsidence existed in both areas after a break-up, which was likely related to the major mantle convection during seafloor spreading, that was triggered by the secondary mantle convection below the continental margin, in addition to the variation in lithospheric thickness. Meanwhile, the stage with delayed subsidence rate differed along strikes. In the Reed Bank area, this stage is between 32–23.8 Ma, while in the Dangerous Grounds, it was much later (between 19–15.5 Ma). We believe the propagated rifting in the South China Sea dominated the changes of this delayed subsidence rate stage.
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| Keywords
dangerous ground
Reed Bank area
tectonic subsidence
secondary mantle convection
propagated rifting
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Corresponding Author(s):
Weiwei DING
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Online First Date: 17 October 2016
Issue Date: 19 May 2017
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