新疆兴地断裂带东段左行走滑位移——来自卫星遥感影像的证据

摘要

兴地断裂带近EW向贯穿库鲁克塔格地区,其活动历史地质界有不同认识,但对位移量无系统论述.利用卫星遥感影像解译,在进一步确定断裂带具体位置及几何特征基础上,通过对被错断的泥盆纪阿尔皮什麦布拉克组、石炭纪花岗岩及侵入该花岗岩中的暗色岩墙断距的测量,确定其东段左行走滑位移量为8.26～9.19 km.根据被错断地质体时代,推测这一左行走滑位移代表了该断裂带二叠纪以来总位移量.从泥盆纪开始,该断裂带已不具构造分区作用.%Xingdi fracture zone is a major fracture acrossing through the Kuraktage area,and different understanding about the tectonic history of this fracture exists.Considering there is no measurement about the Xingdi fracture,this study interpret the satellite remote sensing images and determine the geometry characteristics of this fracture. By determining the cut and displaced boundaries of Devonian sedimentary rocks,Carboniferous granite and granodiorite,and dyke swarm emplaced in them, a measurement of 8.26-9.19km can be convinced as the sinistral strike-slip displacement of the Xingdi fracture.This displacement may be a sum of all the displacement occurred since Permian,inferred from the age of different rocks cut and displaced by fracture,and after Devonian,this fracture can not be considered as the boundary of tectonic divisions.