Analysis of the Finity Deformation in the Continental Splitting in the Northern Margin of the South China Sea ———A Case Study of Xisha Trough

doi:10.7523/j.issn.2095-6134.2005.3.012

›› 2005, Vol. 22 ›› Issue (3): 341-345.DOI: 10.7523/j.issn.2095-6134.2005.3.012

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Analysis of the Finity Deformation in the Continental Splitting in the Northern Margin of the South China Sea ———A Case Study of Xisha Trough

ZHANG Jian¹, SONG Hai-Bin², LI Jia-Biao³

1. Laboratory of Computational Geodynamics, Graduate School of the Chinese Academy of Sciences, Beijing 100049, China;
2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
3. Laboratory of Seafloor Sciences, State Oceanic Administration People’s Republic of China, Hangzhou 310012, China

Received:2004-07-22 Revised:2005-01-04 Online:2005-05-15

Abstract

Abstract:

The geologic deformation generally is predigested as a tiny distortion problem in studies.However,some actual geologic progress,i.e.,the rise and subsidence of Xisha Trough in margin crust splitting of the South China Sea do not accord with the condition of tiny distortion, whereas, the geologic progress belongs to the finite deformation problem.According to the theory of finite distortion,this paper calculated the field of tectonic stress and deformation components of Xisha Trough.The result shows that the moving direction of tectonic deformation depends on the size of structure resistance.The resistance is the smallest in the vertical direction in central Xisha.The largest vertical deformation appears here.Presently, there is a rising move with a velocity of 7 ×10^-3cm a in the center of Xisha Trough.The strain component exx of finite distortion is compression at the center of Xisha Trough,but is tension at south and north sides.On the other hand,the strain component ezz of finite distortion is tension at the center of Xisha Trough,but is compression at south and north sides.

Key words: margin splitting, Xisha Trough, finite deformation

CLC Number:

P541

ZHANG Jian, SONG Hai-Bin, LI Jia-Biao. Analysis of the Finity Deformation in the Continental Splitting in the Northern Margin of the South China Sea ———A Case Study of Xisha Trough[J]. , 2005, 22(3): 341-345.

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Analysis of the Finity Deformation in the Continental Splitting in the Northern Margin of the South China Sea ———A Case Study of Xisha Trough

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