Paleozoic Faulting Structure Styles of the Tazhong Low Uplift,Tarim Basin and Its Mechanism

Based upon the fine interpretations of 3D seismic data in the Tazhong l ow uplift,four series of faulting systems are classified:(1)Cambrian-early Ord ovician tensional fault systems whose distribution,configuration and developmen t scales establish the foundation of the consequent structural activities; (2)la te Ordovician thrust fault systems and northwestward slip fault systems whose st ructural characteristics vary in different zones and fragments:thrust fault sys tem develops in the east,and northwestward slip fault system develops in the mi ddle-west; (3)Silurian-Devonian northeastward slip fault systems formed in extru sion stress background and spread northeastward,which are made up of three part s:the main faults,the tailed en-echelon structures and the fault troughs; (4) the fault system related to Permian magmatic pierces,which distributes spottily or in bands,and are mostly developed along earlier faults and always superimpo se or reform earlier faults. In plane,the Tazhong Paleozoic fault systems are a tensional-shear broom-like structure with sinistral internal rotation layers po inting to the divergent termination.