Geodynamic characteristics of tectonic extension in the northern margin of South China Sea |
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| Authors: | ZHANG Jian WANG Jiyang |
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| Institution: | 1. Graduate School, University of Science and Technology of China, Chinese Academy of Sciences, Beijing 100039, China;Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Correspondence should be addressed to Zhang Jian (email: zhangjian_99@263.net)
2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Correspondence should be addressed to Zhang Jian (email: zhangjian_99@263.net) |
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| Abstract: | Based on the geothermal and gravitation methods, this paper investigated the rheological and thermal structure of the lithosphere
under the northern margin of South China Sea. The result shows that the temperature of the upper crust is 150–300°C lower
than that of the lower crust, and the viscous coefficient of the upper crust is 2–3 orders of magnitude larger than that of
the lower crust. It reveals that the upper crust is characterized by brittle deformation while the lower crust by ductile
deformation. A channel of lower-viscosity should be formed between the upper and lower crust when the lithosphere is scattered
and spreads out toward ocean from northwest to southeast along the northern margin of South China Sea. And, a brittle deformation
takes place in the upper part of the lithosphere while a ductile deformation takes place in the lower part of the lithosphere
due to different viscous coefficients and temperature. The layered deformation leads the faulted blocks to rotate along the
faulting and the marginal grabens to appear in the northern margin of South China Sea in Cenozoic tectonic expansion. |
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| Keywords: | the northern margin of South China Sea the zone of continental margin thermal and rheological structure layered deformation of lithosphere |
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