The Chaobei Region of Anhui Province is tectonically located in the eastern part of the lateMesozoic North China Plateau, to east of the Tanlu fault, and in the northern margin of the Lower Yangtze foldthrust belt of the Yangtze Block in the southern Sulu High Pressure and UltraHigh Pressure orogenic belt. Its evolution is constrained by the tectonic setting and characterized by superimposed faulting structures consisting of two synclines and one anticline. The structure of this kind and concealed structural deformation may attribute to multiphase defomations, including three folding stages in Indosinian and three thrusting related. The firststage deformation is characterized mainly by low angular detachment planes of Lower Siliurian Gaojiabian Formation and the related local faults and faultdetatched folds. The secondstage resulted in the tectonic pattern containing one folding system (two synclines and one anticline) and one NWSEstriking imbricated thrusting complex. The thirdstage is characterized by NWWstriking open folds and lowerangle thrust. During the middle Yanshanian, one NSstriking fold superposed onto the earlier structures. However, the late Yanshanian NWtrending faulting is characterized by NEdipping dominotype normal fault complex in this area, which regionally controls Upper Creatacious depocenter. The regional correlation shows that the Indosinian deformation is in agreement with the SuluDabie deformation, indicating that they are related to exhumation mechanism of the HPUHP rocks in the DabieSulu orogen and that the Yanshanian deformation dynamics is probably related to both the subduction of the PaleoPacific Plate and escaping structure in eastern China.
李三忠,李安龙,范德江,赵广涛,金宠,戴黎明.2009.安徽巢北地区的中生代构造变形及其大地构造背景[J].地质学报,83(2):208-217. lisanzhong,-,-,-,-,-.2009. Mesozoic Structure Deformation of the Chaobei Region, Anhui Province and Its Tectonic Setting[J]. Acta Geologica Sinica,83(2):208-217.