Fault system and its control of carbonate platform in Tazhong uplift area, Tarim basin

Abstract：The construction and reformation of carbonate platform are controlled by many factors. This paper has mainly discussed?the development and destruction of the carbonate platform under the control of fault activities. There are mainly two types of fault systems developed in Tazhong area, namely the NW-trending basement-involved fault system and the NE-trending cap rock decollement fault system. The former was mainly developed during Caledonian I episode tectonic movement in Late Early Ordovician, and it controlled the tectonic framework which had been formed when the Tazhong uplift started its formation and changed the carbonate platform from the early ramp-ramp-edge type to the isolated reef type. The latter was mainly formed during Mid-Caledonian II episode tectonic movement in Late Ordovician, and its strong activity led to the tilting movement of Tazhong area and, as a result, the eastern uplift started its reformation, which seriously destroyed the carbonate platform formed earlier.