STRUCTURAL STYLES AND EVOLUTION IN THE HEFEI BASIN

The Hefei Basin is located in the connection of the North China Platform, the Yangtze Paraplatform and the North Huaiyang Fold Belt, and was long influenced by the Dabie Orogenic Belt and the Tanlu Fault. The structural evolution can be divided into two stages including the formation of basinal basement and the development of the basin. The basin mainly underwent the thrusts during the Indosinian, Late Yanshanian and Early Himalayan movements, and two extensional movements were developed during the Early Yanshanian and Early Himalayan activities. Four structural styles, i.e., compression structure, extensional structure, negative inversion structure and strike-slip faults, were developed as a result of the tectonic movements mentioned above. A systematic study on the structures of the basin will provide information for petroleum exploration in the basin.