天山造山带东段构造变形对增生造山末期的响应  

Deformation in Eastern Tianshan Orogenic Belt: Response to the Final Stage of Accretionary Orogenesis

作　　者：王凯[1,2] 计文化 孟勇[1] 张欣[1] 朱晓辉[1] 李平 WANG Kai;JI Wenhua;MENG Yong;ZHANG Xin;ZHU Xiaohui;LI Ping(Research Center for Orogenic Geology,Xi’an Center of Geological Survey,Geological Survey of China,Xi’an 710054,Shaanxi,China;Xinjiang Research Center for Mineral Resources,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,Xinjiang,China)

机构地区：[1]中国地质调查局造山带地质研究中心,中国地质调查局西安地质调查中心,陕西西安710054 [2]中国科学院新疆生态与地理研究所矿产资源研究中心,新疆乌鲁木齐830011

出　　处：《大地构造与成矿学》2019年第5期894-910,共17页Geotectonica et Metallogenia

基　　金：中国地质调查局基础性公益性地质矿产调查项目(DD20160009、DD20189612);新疆东天山1∶25万沁城幅(K46C002004)区调修测项目(1212011120473);陕西省自然科学基金项目(2018JM4001)联合资助

摘　　要：天山造山带位于中亚造山带最南端,是研究和认识中亚造山带晚古生代增生造山过程的关键地区。本文聚焦于天山造山带东段发育的最晚一期脆韧性构造变形,通过对阿其克库都克断裂带、康古尔断裂带和哈尔里克构造带等变形带内的构造几何学和运动学特征解析,认为阿其克库都克断裂带表现为由南向北逆冲兼右行剪切变形特征,康古尔断裂带表现为南北向挤压兼右行剪切变形特征,哈尔里克构造带表现为由北向南的逆冲叠加稍晚期的左行走滑剪切变形特征。结合大量已有的构造热年代学数据分析,指出各构造单元内最晚一期脆韧性变形时间为二叠纪晚期-中三叠世,指示该时间段内近东西走向的天山造山带东段和北西-南东走向的东准噶尔造山带与西侧哈萨克斯坦弧形造山系呈现为三向汇聚的动力学特征,代表中亚造山带增生造山末期的演化特征。The Tianshan Orogenic Belt is the southernmost part of the Central Asian Orogenic Belt (CAOB), and is one of the key loci to study the accretionary orogenesis of the CAOB. This paper focuses on the latest phase of brittle-ductile deformation in the eastern Tianshan by analyzing the geometry and kinematics of deformation in the Aqqikkuduk fault zone, the Kangguer fault zone and, the Harlik zone. Our analysis shows that the Aqqikkuduk fault zone is characterized by northward thrusting with dextral strike-slip motion;the Kangguer fault zone is characterized by N-S compression with dextral strike-slip motion;and the Harlik zone is characterized by southward thrusting with superimposed sinistral strike-slip motion. Our analysis, in combination with the large published thermochronological dataset, suggests that during the late Permian to Middle Triassic, the roughly E-W striking eastern segment of Tianshan converged onto the NW-SE striking Eastern Junggar Belt on the Kazakhstan orocline to the west, forming a ‘Three-direction convergence’ tectonic system. The convergence represents the spatial adjustment between the tectonic units during the final stage of accretionary orogenesis of the CAOB.

关 键 词：天山造山带东段 二叠纪晚期-中三叠世 构造解析 三向汇聚 

分 类 号：P542[天文地球—构造地质学]