【摘要】 三维地震资料解析表明,塔中低凸起古生代断裂样式复杂,发育有4期不同性质的断裂:①寒武纪—早奥陶世张性正断裂,其展布形态和发育规模为后期构造活动奠定了基础;②晚奥陶世逆冲及走滑断裂,具有明显的分带、分段性,东部主要为基底卷入逆冲断裂,中西部为盖层滑脱和北西向走滑断裂;③志留—泥盆纪挤压应力环境下形成的走滑断裂体系,北东南西向展布,包括主干边界断裂、尾端羽列断裂和拉分地堑3个组成要素,主干断裂在剖面上断面近于直立,直插基底,延伸较远,与其他各级断裂构成花状构造,其尾端发育有羽列断裂,拉分地堑受多级断层控制,平面上呈菱形;④二叠纪岩浆活动派生断裂,岩浆刺穿对早期断裂进行叠置和改造,形成一系列似"花状构造"。从断裂平面展布来看,塔中古生代断裂整体上呈发散的帚状,其构造枢纽端位于东段,内旋层左旋扭动,外旋层右旋,内旋层指向发散端,属张扭性帚状构造。更多还原

【Abstract】 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.更多还原