The Dayingzi detachment fault system in Liaodong Peninsula and its regional tectonic significance

查看全文 作　　者：SHEN [1]Liang;LIU [1]JunLai;HU [1]Ling;JI [2]Mo;GUAN [3]HuiMei;Gregory A [4]DAVIS

机构地区：[1]State Key Laboratory of Geological Processes and Mineral Resources, China University ofGeosciences, Beijing 100083, China;[2]China National Offshore Oil Corporation Research Institute, Beijing 100027, China;[3]Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;[4]Department of Earth Sciences, University of Southern California, Los Angeles, CA90089-0740, USA

出　　处：《Science China Earth Sciences》索引2011年第54卷第10期,共15页

基　　金：supported by National Natural Science Foundation of China (Grant No. 90814006);111 Project (Grant No. B07011) 摘　　要：Large scale lithosphere thinning is an important characteristic of the destruction of the North China Craton (NCC) during the late Mesozoic. A series of extensional structures were developed under extensional setting, among which is the Dayingzi detachment fault system (DFS). The DFS is constituted by three parts, volcano-sedimentary basins at the hanging wall, the Dayingzi-Huanghuadian detachment fault zone, and Paleoproterozoic metamorphic rock series and Mesozoic plutons at the foot-wall. In the section across the detachment fault zone, there is a sequence of tectonites including fault gouge, microbreccia, cataclastic-mylonites, mylonites, and gneissic biotite monzonite granite. Microstructural characteristics of tectonites and electron backscatter diffraction (EBSD) patterns of quartz indicate that the rocks from the footwall experienced a process from upper greenschist facies to lower greenschist facies. SHRIMP and LA-ICP MS U-Pb dating of zircons from the volcanic rocks in the basins, the tectonic evolution of the DFS is summarized as follows: 1) regional extension started at 135.0±1.2 Ma ago, when the detachment fault cut through the middle crust. Faulting induced the upwelling of magma and eruption of volcanic rocks and deformed a series of medium-acid volcanic rocks; 2) after 135.0±1.2 Ma, a large scale detachment faulting was active cross-cutting the mid-upper crust. The western margin of Jurassic and Triassic granite was ductilly and brittly sheared; besides, the Cretaceous volcano-sedimentary rocks were tilted when the master fault approached the surface; 3) at around 127±1 Ma, the detachment fault stopped its activity and was intruded by the unsheared Cretaceous granite near Chaoyang. Comparison with the Liaonan metamorphic core complex (MCC) and other extensional structures in Liaodong Peninsula led to a general trend of including three zones in the Peninsula: MCC zone, detachment fault systems (DFS) zone, and half graben zone. MCC commonly cuts through the mid-lower crust, DFS through the mid-upper crust, and half graben through the upper crust. Therefore, development of the extensional structures in Liaodong Peninsula indicates that they are the results of crustal extension and thinning at different crustal levels. They may provide a deep insight into the dynamic mechanism, history of destruction and lithosphere thinning of the North China Craton (NCC). 关键词：拆离断层系统辽东半岛故障构造意义中酸性火山岩岩石圈减薄华北克拉通二长花岗岩

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The Dayingzi detachment fault system in Liaodong Peninsula and its regional tectonic significance

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