Tectonic Characteristics, Evolution, and Significance of the Zhouwang Fault, Lower Yangtze Area, Eastern China  

作　　者：ZHANG Gang CHEN Guangtao REN Shenglian GE Can LIN Shoufa SONG Chuanzhong LI Longming 

机构地区：[1]School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China [2]Institute of Geophysical and Geochemical Prospecting Techniques of Anhui Province,Hefei 230022,China [3]Department of Earth Sciences,University of Waterloo,Waterloo N2L3G1,Ontario,Canada

出　　处：《Acta Geologica Sinica(English Edition)》2022年第2期460-476,共17页地质学报（英文版）

基　　金：supported by the Second-level Project of Nanjing Geological Survey Center of the China Geological Survey(Grant No.DD20190043);the National Natural Science Foundation of China(Grant Nos.41572177,41272213,41573023,41072161,41502193,41272222)。

摘　　要：Fault geometry, kinematics, geophysics, the tectonic stress field and tectonic evolution of the Zhouwang fault in the southern Jiangnan tectonic transition zone of the Lower Yangtze region, eastern China are examined. Field observations show the fault is composed of a series of nearly E–W trending, N–S dipping faults, and four stages of tectonism(sinistral strike-slip, thrust nappe, normal fault, and dextral strike-slip) developed in turn. Geophysical data show that the fault trends almost linearly E–W along a flat, steep gravity gradient at shallow depth, with distinct gravity anomalies to the north and south and different in the north and south. Also, the deep part is characterized by northward dip and a gradual slowing down. Tectonic stress field analysis indicates that the fault experienced four tectonic movements: NNE–SSW compression, NNW–SSE compression, NEE–SWW extension, and E–W compression. Combined with regional tectonic background and previous research results, this indicates that:(1) the Zhouwang fault experienced sinistral strike-slip movement during the Indosinian Period(260–200 Ma);(2) thrust nappes developed during the early Yanshanian Period(163–145 Ma);(3) a normal fault occurred in the late Yanshanian Period(125–65 Ma);and(4) dextral strike-slip movement occurred in the Himalayan Period(ca. 50–37 Ma). The results reveal the tectonic evolution of the fault during Mesozoic deformation in the area, and also reveal the geological evolution and tectonic transformation of the Lower Yangtze region, which is key to our understanding of intracontinental deformation in eastern China.

关 键 词：bouguer gravity anomaly stress field tectonic evolution Zhouwang fault Lower Yangtze 

分 类 号：P548[天文地球—构造地质学]