塔里木盆地孔雀河地区构造特征及演化

孔雀河地区位于塔里木盆地东北部,从前震旦纪至今,经历了多期的构造变动和复杂的演化历史,形成了现今北西西-近东西向、北北东-近南北向、北北西向和北东东向基本断裂体系,同时断裂活动表现为多期性和继承性的特点;发育断背斜、断鼻、背斜及断块等构造圈闭类型,其分布具有东西分区、纵向分层的特征.纵向上,就中生界、古生界而言,下古生界较中生界发育,上古生界不发育;横向上,明显受断层控制,并沿主控断层走向方向成排成带展布;利用平衡剖面法,并结合区域构造研究成果将该区构造演化划为五个阶段:被动陆缘裂陷阶段(Z-O1)、拉张至挤压环境转变阶段(O2-S)、北东和北西向构造发育阶段(D-P1)、古生代构造的再生长及近东西向褶皱形成阶段(J)、大面积的整体升降运动阶段(K-Q).

Tectonic characteristics and evolution of the Kongquehe region in Tarim Basin,Xinjiang,China

The Kongquehe region is located in the northeast of Tarim Basin.From Presinian period,multistage tectonic deformations and complicated evolvements have been experienced there.Up to now,the basic fault systems of NWW-near EW,NNE-near SN,NNW and NEE are established and the fault movement has the characteristics of multistage and inheritance.The traps are dominated by fault-anticline,fault-nose, anticline and fault-block,and characterized by structural zones east and west and layers north and south.In Mesozoic and Paleozoic periods,Lower Paleozoic is more developed than Mesozoic in vertical direction,Upper Paleozoic,however,is undeveloped.Obviously dominated by faults horizontally,the formed structures are distributed in rows and zones along the major fault strike.According to the balanced cross section and the research results of the regional structure,the tectonic evolution in the Kongquehe region can be divided into five periods: passive continental margin chasmic stage(Z-O1),extension-compression transition stage(O2-S),NE-NW tectonic development stage(D-P1),regrowth of Paleozoic era and near ES fold formation stage(J) and the whole area of lifting movement stage(K-Q).