COUPLING RELATIONS BETWEEN THE HEFEI BASIN AND THE DABIE-ZHANGBALING OROGENIC BELT

The existing Dabie-Zhangbaling Orogenic Belt,whose formation and evolution apparently controlled the features and evolution of the Meso-Cenozoic Hefei Basin,has been formed since the Indosinian epoch.There were close coupling relations between the basin types and its reforming styles of the Hefei Basin in the different periods of the Meso-Cenozoic and the moving styles of the Dabie-Zhangbaling Orogenic Belt:a) the coupling of the thrust reformation in the Indosinian (the Middle-Late Triassic) displayed in where the Hefei Basin is with the syncollision compressive obduction orogenesis which resulted in the final collision and matching of the Yangtze Plate and the Huabei Plate and the formation of the Dabie-Zhangbaling Orogenic Belt;b) the coupling of the formation of the paraforeland Hefei Basin in the Jurassic with the strong buoyancy diapir orogenic uplifting of the Dabie-Zhangbaling Orogenic Balt resulted from the folding subsidence of the underthrust Yangtze Plate and the further matching compressive orogenesis of the Yangtze-Huabei Landmass;c) the coupling of the formation of the slide-overlap and strike-slip composite Hefei Basin in the Early Cretaceous with the thermal-uplifting extension of the Dabie Orogenic Belt and the strike-slip movement of the Zhangbaling Orogenic Belt;d) the coupling of the thrust reformation displayed by the major Hefei Basin in the early stage of the Late Cretaceous and the formation of down-warped basins in the northeast part with the thermal-uplifting extension of the Dabie Orogenic Belt and the weak compression of the Zhangbaling Orogenic Belt;e) the coupling of the formation of tenso-shear rift basins in the late stage of the Late Cretaceous to the Paleogene with the postorogenic collapse of the Dabie-Zhangbaling Orogenic Belt and the differential elevation and subsidence of fault blocks;f) the Dabie-Zhangbaling Orogenic Belt since the main episode of the Himalayan movement in the Oligocene totally displaying weakly compressive and compresso-shear orogenic uplifting and being gradually denuded and leveled,and providing material sources for the down-warped deposition of the Hefei Basin in the Neogene-Quaternary.