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塔里木盆地北部坳陷中部存在一个北东—南西方向的下古生界的(鞍状)低梁带(阿—满低梁带)。它是阿瓦提凹陷和满加尔凹陷之间的天然分界,以此低梁带的脊线划分出两个凹陷。以三维地震资料解释为依据,本文研究了阿—满低梁带的断裂构造特征。研究区主要发育4期断裂构造:1)南华纪—奥陶纪的正断层与罗迪尼亚超大陆的裂解有关,并可进一步划分为南华纪—震旦纪和寒武纪—奥陶纪两个断裂活动阶段。南华纪—震旦纪正断层的成因是罗迪尼亚超大陆的裂解作用,形成堑垒构造;寒武纪—奥陶纪正断层的成因是塔里木自罗迪尼亚超大陆裂解出来后,游离于古特提斯洋所处的区域性弱伸展构造背景,形成负花状构造。2)晚奥陶世—中志留世断层包括晚奥陶世—志留纪初的滑脱—冲断构造和早-中志留世的挤压走滑断裂,形成断层传播褶皱和正花状构造。其形成的动力来源是昆仑加里东碰撞造山作用。3)晚志留世—石炭纪正断层是昆仑加里东碰撞造山后构造应力松弛阶段的产物,形成典型的负花状构造,组合成雁列状张扭性断层带。4)二叠纪正断层是大陆裂谷作用的结果,往往受相关岩浆作用的改造。剖面上形成堑垒构造和负花状构造,平面上组合成雁列状张扭性断层带。二叠纪断裂与晚志留世—石炭纪的断裂可能有继承关系。
There is a lower Paleozoic (saddle-shaped) low-berthing belt (A-lower lobe belt) in the NE direction in the northern part of the northern Tarim Basin. It is the natural boundary between the Awati and Manjar sags, and the two ridges are defined by the ridges of the lower lobe. Based on the three-dimensional seismic data interpretation, this paper studies the fault structure features of the A-Banding belt. In the study area, there are mainly four fault structures: 1) The Nanhua-Ordovician normal faults are related to the cleavage of the Rodinian supercontinent and can be further divided into the Nanhua-Sinian and Cambrian-Ordovician A fracture activity stage. The Sinian-Sinian normal fault is caused by the cleavage of the Mid-Atlantic in the Rodinian and forms a cutting-barrier structure. The origin of the Cambrian-Ordovician normal faults is that after the Tarim has been cleaved from the supercontinent of the Rodinia, The regional weak extensional tectonic background in the ancient Tethys Ocean formed a negative flower-like structure. 2) Late Ordovician-Middle Silurian faults include slip-tectonism of the Late Ordovician-Silurian and early-middle Silurian squeezed strike-slip faults, forming fault propagation folds and positive flower-like structures . The formation of the power source is the Kunlun Caledonian collision orogeny. 3) Late Silurian - Carboniferous normal fault is the product of tectonic stress relaxation stage after the collision of the Kunlun-Caledonian continent, forming a typical negative flower-like structure and combining into an echelon tension-torsional fault zone. 4) Permian normal faults are the result of continental rifting and are often altered by associated magmatism. The formation of the cut-off barrier structure and the negative flower-like structure, the plane is combined into an echelon Zhang twist fault zone. Permian faults and Late Silurian - Carboniferous faults may have inheritance relations.