TECTONIC CONTROL OF THE DABIESHAN OROGENIC BELT OVER THE HEFEI BASIN

The North Huaiyang Structural Belt is composed of a series of thrust slices up to north, and is the transitional zone between the Dabieshan Orogenic Belt and the Hefei Basin. It underwent two generations of thrusting of the Early Yanshanian and the Late Yanshanian. The Early Yanshanian structure is characterized by back detachementing and front thrusting, and the Late Yanshanian one is expressed by regional extruding and thrusting up to north. The Hefei Basin underwent two generations of subsidence including depressions and faulted sags. The depression is controlled by uplifting of the Dabieshan Mountain caused by subducting of the basement of the Yangtze Continental Block, and the faulted sag is affected by the divergence uplifting. They show a good tectonic coupling relationship. The Shucheng Depression in the southeastern part of the Hefei Basin is a tectonic favorable area for oil and gas exploration.