塔中隆起带断裂系统及其对碳酸盐岩台地的控制

碳酸盐岩台地的建造与改造受多种因素的控制,本文主要探讨以断裂活动为代表的构造运动对碳酸盐岩台地发育和破坏的控制作用。塔中地区主要发育NW向基底卷入式断裂系统和NE向盖层滑脱式逆冲断裂系统两大类,前者主要形成于早奥陶世末的中加里东I幕构造运动,该断裂控制了塔中隆起开始形成时的构造格局,从而使塔中隆起带碳酸盐岩台地由早期的缓坡-镶边缓坡型的台地结构演化为礁滩型孤立台地,而后者主要形成于晚奥陶世末中加里东II幕构造运动,该断裂的强烈活动,使得塔中地区发生东西翘倾运动,东部隆起接受改造,早期的碳酸盐岩台地遭受严重破坏。

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

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.