河西走廊西段花海断裂几何学、运动学及区域构造意义  

Geometry,Kinematics and Regional Tectonic Significance of the Huahai Fault in the Western Hexi Corridor,NW China

作　　者：云龙 张进[2] 徐伟 刘志成 张竞嘉 赵衡[2] 张北航[2] Yun Long;Zhang Jin;Xu Wei;Liu Zhicheng;Zhang Jingjia;Zhao Heng;Zhang Beihang(Key Laboratory on Geological Disposal of High-Level Radioactive Waste,Beijing Research Institute of Uranium Geology,CNNC,Beijing 100029,China;Institute of Geology,Chinese Academy of Geological Science,Beijing 100037,China;China Earthquake Disaster Prevention Center,Beijing 100029,China)

机构地区：[1]核工业北京地质研究院中核高放废物地质处置评价技术重点实验室,北京100029 [2]中国地质科学院地质研究所,北京100037 [3]中国地震灾害防御中心,北京100029

出　　处：《地球科学》2021年第1期259-271,共13页Earth Science

基　　金：国家自然科学基金项目(No.41572190);高放废物地质处置地下实验室工程前期科研项目(No.FZ1501);核工业北京地质研究院院长青年科技创新基金项目(No.QJ1601).

摘　　要：花海断裂位于河西走廊西段花海盆地内,总体走向NNW⁃SSE,长约38 km,为一条隐伏断裂,研究其空间展布、运动性质和活动历史对于理解青藏高原北缘的构造变形和扩展方式有重要意义.基于卫片解译、野外实地和槽探,结合光释光测年和地球物理资料,发现沿双泉子、大泉至小泉一带,发育一段长约8 km的地形陡坎,代表断裂控制下褶皱作用的地形表现.沿陡坎走向向南,断裂一直隐伏延伸至宽滩山和黑山以北.现有资料分析表明,断裂经历了早白垩世的正断、晚白垩的逆冲运动.新生代以来,断裂继承了之前的逆冲运动并一直持续至全新世中晚期.高原北缘的侧向扩展,使得作为三危山与阿尔金断裂之间块体边界的三危山、干峡山、宽滩山和塔尔湾−登登山−池家刺窝断裂发生以左旋走滑为主兼有逆冲的变形,导致了边界断裂控制山体的隆升,而内部的块体受压剪作用向北东运动.花海断裂的逆冲运动即是该次构造活动事件的响应.The NNW⁃SSE striking Huahai fault develops in the Huahai Basin in the western Hexi corridor.Its spatial distribution,kinematics and activity are significance for understanding the tectonic deformation and outgrowth of the northern margin of the Qinghai-Tibet Plateau.Based on the interpretation of satellite images,field surveying,trenching,optical luminescence dating and existing geophysical data,the characteristics of Huahai fault are reported.A landform scarp develops along the Huahai fault,which is approximate 8 km long from Shuangquanzi,Daquan to Xiaoquan.This scarp is caused by the fault related folding.The fault extends southward to the northern Kuantanshan and Heishan ranges indicated by scarps,springs and landforms.The Huahai fault was once a normal fault in the Early Cretaceous,and was inversed to be a thrust fault in the Late Cretaceous.During the Cenozoic,the northward growth of the Qinghai-Tibetan Plateau resulted in development of a series of sinistrally transpressive faults such as the Sanweishan,Ganxiashan,Kuantanshan and Taerwan⁃Dengdengshan⁃Chijiaoziwo faults.These faults are boundaries of blocks between the Sanweishan and Altyn Tagh faults,and cause the uplift of the mountain ranges along faults,and the northeastward movement of blocks among faults.The thrusting of the Huahai fault is the response of this recent tectonic event.

关 键 词：青藏高原 河西走廊西段 花海断裂 新生代 活动历史 构造学 

分 类 号：P542[天文地球—构造地质学]