收稿日期: 2004-07-22
修回日期: 2005-01-04
网络出版日期: 2005-05-15
基金资助
国家自然科学基金项目(40474031;40174027);国家重点基础研究发展规划项目(G2000046704)资助
Analysis of the Finity Deformation in the Continental Splitting in the Northern Margin of the South China Sea ———A Case Study of Xisha Trough
Received date: 2004-07-22
Revised date: 2005-01-04
Online published: 2005-05-15
张健 , 宋海斌 , 李家彪 . 南海北部陆缘有限变形分析——以西沙海槽为例[J]. 中国科学院大学学报, 2005 , 22(3) : 341 -345 . DOI: 10.7523/j.issn.2095-6134.2005.3.012
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
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