TECTONIC DEFORMATION FEATURES OF SHENNONGJIA REGION IN EASTERN DABASHAN FORELAND STRUCTURAL BELT
TECTONIC DEFORMATION FEATURES OF SHENNONGJIA REGION IN EASTERN DABASHAN FORELAND STRUCTURAL BELT
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发表时间：
2009
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通讯作者：
L. Jianhua;Zhang Yueqiao;Shi Wei;Lin Hailong;Dong Shuwen
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作者：
L. Jianhua;Zhang Yueqiao;Shi Wei;Lin Hailong;Dong Shuwen
神农架位于大巴山前陆弧形构造带的东部，以阳日断裂为界，可分为北方和南部，北方以W-E向基底卷入滑脱和盖层褶皱为特征，古生界盖层褶皱紧密，南部为神农架基底隆起，周边变形特征各异，从断裂运动学和滑动矢量古构造应力反演的野外分析结果看，该隆起的构造变形特征是：（1）构造变形以北方边缘变形弱，东部边缘变形强;（2）西、南部边缘存在裙状褶皱构造，南部边缘以大倾伏角褶皱枢纽为特征;（3）断裂运动学和滑动矢量古构造应力反演的野外分析结果表明，可以看出，该区主要受南北向挤压应力场控制，而东缘应力场由北西向北西转换，区域构造分析与对比表明，大巴山前陆构造带东段经历了印支期的原始形成阶段，燕山末期，神农架基底隆起对大巴山前陆弧形构造带的形成起到了制约作用，研究神农架变形对认识大巴山前陆弧形构造带的形成和演化具有重要意义。
Shennongjia is located in the eastern part of Dabashan foreland arc-shaped structural belt.With the Yangri fault as a boundary,this region can be divided into the northern and southern parts.The northern part is characterized by W-E trending basement-involved detachment and cover folding,with the Palaeozoic cover closely folded.The southern part,named Shennongjia basement uplift,has different deformation features in the periphery,with deformation weak in northern margin but strong in the eastern one.As to this uplift,there are skirtlike fold structures in its western and southern margins,and the southern ones were characterized by fold hinge with large plunge angle.From the field analysis of fault kinematics and paleo-tectonic stress inversion from slip vectors,we can see that the region was mainly controlled by S-N compression stress field,but the stress field of the eastern margin was changed into NW-SE because of the compression from Shennongjia and Huangling uplift.Regional structural analysis and comparison showed that the eastern part of Dabashan foreland structural belt experienced Indosian primary formation stage and Yanshan final formation stage, and the Shennongjia basement uplift played a role of restriction in the formation of Dabashan foreland arc-shaped structural belt.The research on the deformation of Shennongjia has great significance to understanding the formation and evolution of the Dabashan foreland arc-shaped structural belt.