塔里木盆地东南部车尔臣断裂的分段特征及动力学机制

塔里木盆地东南部的车尔臣断裂是早古生代末以来长期活动的深大断裂带。直到中生代末期,阿尔金断裂系、西昆仑断裂系和车尔臣断裂系才成为统一的断裂系统。车尔臣断裂由西至东可划分为两段:西段早古生代末以来多次强烈活动,分支断裂发育;东段主要在中生代以前活动,中生代以后微弱活动。印度板块与欧亚板块碰撞的远程应力控制了车尔臣断裂中生代末以来的构造变形。中、新生代时,车尔臣断裂西段不但受阿尔金构造带的作用力,还受西昆仑构造带的作用力,因此断裂活动强度大;车尔臣断裂东段由于阿尔金构造带的挤压应力被阿尔金山的隆升及阿尔金山前的构造变形所消减,断裂活动强度小。

Segmentation characteristics and dynamic mechanism of the Che'erchen Fault in the Southeast Tarim Basin

The deep and large-scale Che'erchen Fault has been active since the end of the Early Paleozoic. However,it wasn't until the end of the Mesozoic that the Altun Fault,the West Kunlun Fault,and the Che'erchen Fault,were combined as one whole system.According to the geometric and dynamic characteristics of the fault,the Che'erchen can be divided into two segments from west to east:the western segment and the eastern segment.The former with its well-developed branches has experienced several intense tectonic activities since the end of the Early Paleozoic,while the latter was active before the Mesozoic but less active after the Mesozoic.The long-distance stress resulted from collision between the Indian Plate and the Eurasian Plate had controlled the structural deformation of the Che'erchen Fault since the Mesozoic.During the Mesozoic and the Cenozoic,faulting in the western segment of the Che'erchen Fault was rather strong due to the structural stresses of both the Altun Fault and the West Kunlun Fault;while faulting in the eastern segment of the fault was less intensive because the compressive stress from the Ahun Fault was offset by the rising of the Altun Mountain and the piedmont tectonization of the Ahun Mountain.