Structural Segmentation and Zonation and Differential Deformation Across and along the Lomgmen Thrust Belt, Western Sichuan Province, China
详细信息
- 责任者：Li Zhiwu (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Liu Shugen
- 刊名：Journal of Chengdu University of Technology
- 出版年：2008
- 卷期：35(4)
- 关键词：断层分段性 ; fault segmentation
- 页码：p.440-454
- 图表：8 illus., 1 table, 46 refs.
- 分类号：0300
- issnNo：ISSN1671-9727
- isbnNo：CN51-1634/N
摘要
///The NE-trending Longmen thrust belt defines the eastern margin of the Tibetan Plateau, and separates the Songpan-Ganzi fold belt to the west by the Maoxian-Wenchuan fault from the Sichuan Basin to the east by the Anxian-Dujiangyan (Guanxian) fault. The Longmen thrust belt comprises a serial of thrust sheets bounded by four major SE-directed thrusting faults,i.e.,from west to east the Qingchuan-Maoxian-Wenchuan fault,Beichuan-Yingxiu-Wulong fault,Anxian-Dujiangyan-Shuangshi fault and Guangyuan-Dayi-Ya’an (blind) fault. The deformation across the Lomgmen thrust belt changes from ductile to ductile-brittle to brittle from northwest to southeast, exhibiting a distinct structural zonation. The northern Longmen Mountains is characterized by Proterozoic Jiaoziding basement complex and Tangwangzhai syncline,and the middle and southern Longmen Mountains are symbolized respectively by the Proterozoic Peng-Guan and Baoxing basement complexes, both with klippes along the front of the complexes. Along the Longmen thrust belt, from northeast to southwest, folding and thrusting initiation and finalization tend to be young, the deformation is more brittle and extensive, and the Cenozoic activity is more intense. The structural zonation and segmentation across and along the Longmen thrust belt are mainly associated with the Indosinian amalgamation between North China Block, South China Block and Qiangtang Block, and the Cenozoic India-Asia collision.