包尔图断裂和硕—和静段晚第四纪以来的地质地貌证据  

GEOLOGICAL AND GEOMORPHOLOGICAL EVIDENCES FROM HESHUO-HEJING SECTION OF BAOERTU FAULT SINCE LATE QUATERNARY

作　　者：黄帅堂 马建 刘志坚[1] 赖爱京 HUANG Shuai-tang;MA Jian;LIU Zhi-jian;LAI Ai-jing(Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China;Akesu Central Seismological Station,Akesu 843000,Xinjiang,China)

机构地区：[1]新疆维吾尔自治区地震局,新疆乌鲁木齐830011 [2]阿克苏中心地震台,新疆阿克苏843000

出　　处：《内陆地震》2021年第1期67-74,共8页Inland Earthquake

基　　金：中国地震局地震预测研究所基本科研业务费专项重点项目(援疆项目)(2016IES0103);地震应急青年课题(CEAEDEM201916);新疆地震科学基金(201910).

摘　　要：天山是典型的陆内造山带,对天山内部构造变形特征的探讨,有利于认识其变形过程和应变分配方式。目前,天山活动构造研究多集中于盆—山结合部位,然而,对于天山内部活动断裂的研究并不多见。本次研究主要聚焦于南天山与塔里木板块的分界断裂—包尔图断裂。通过遥感影像解译和野外地质调查发现,包尔图断裂是一条NWW走向的兼具逆冲性质的左旋走滑断裂,全长逾400 km,是一条区域性深大断裂。断裂控制了小尤路都斯盆地和现代河谷的形成,根据断裂几何展布可初步划分为东西2段,在和硕—和静段,断裂线性笔直,断错了晚第四纪以来的多期地貌面,最大垂直位错量为9.6~10.7 m,最小垂直位移量0.8~0.9 m;断裂晚更新世以来的水平滑动速率应与断裂东段库米什盆地的左旋滑动速率一致,约0.56 mm/a。断层最新活动断错水系T 1阶地,是一条全新世活动断层。Tianshan is a typical intracontinental orogenic belt.The study of the structural deformation characteristics in Tianshan is helpful to understand its deformation process and strain distribution.At present,the study of active tectonics in Tianshan mainly focuses on the basin mountain junction,however,the study of active faults in Tianshan is rare.This study focuses on the baoertu fault,the boundary fault between South Tianshan and Tarim plate.Through remote sensing image interpretation and field geological survey,it is found that baoertu fault is a NWW trending left lateral strike slip fault with thrust characteristics,with a total length of 400 km.It is a regional deep fault,and controlled the formation of Xiaouludus basin and the modern valley.According to the geometric distribution of the fault,it can be divided into two parts:East and West.In Heshuo—Hejing section,the fault is linear and straight,and the multi-stage geomorphic surface since the late Quaternary is staggered.The maximum vertical displacement is 9.6~10.7 m,and the minimum vertical displacement is 0.8~0.9 m.The horizontal slip rate of the fault since late Pleistocene should be consistent with the sinistral slip rate of Kumish basin in the eastern segment of the fault,about 0.56 mm/a.The latest fault activity is located in the water system T1 terrace,which is a Holocene Active fault.

关 键 词：包尔图断裂 断错地貌 活动时代 滑动速率 和硕—和静 

分 类 号：P315.9[天文地球—地震学]