摘要:跃南断裂带是塔里木盆地北部的一条形状奇特的断裂带，平面展布呈口袋状。在系统的地震资料解释的基础上，通过认真的断裂构造分析，认为跃南断裂带经历了二叠纪、二叠纪末—三叠纪和侏罗—白垩纪3期断裂作用的叠加。二叠纪大陆裂谷作用形成的一系列NE-SW和NW-SE走向的陡倾的正断层，组成一个共轭断裂系统。沿跃南断裂带的两组不同方向的正断层活动加强，并最终追踪、贯通，形成了口袋状的跃南断裂带。也就是说，跃南断裂带实际上是由NE-SW和NW-SE走向两组断层组合而成的。断裂带围限的地块相对抬升，形成一个大型的垒块。二叠纪末—三叠纪南天山碰撞造山作用引起的逆冲断层，叠加在二叠纪正断层之上，进一步强化了跃南断裂带，使之断距加大，围限的垒块进一步抬升。侏罗—白垩纪的正断层属于南天山造山后的伸展构造，见于跃南断裂带上方，规模不大，数量不多，对断裂带有一定的调整作用。
关键词: 二叠纪正断层/
二叠纪末—三叠纪逆冲断层/
侏罗—白垩纪正断层/
大陆裂谷/
同碰撞构造/
碰撞后构造/
跃南断裂带/
塔里木盆地北部
Abstract:The Yuenan fault belt in the northern Tarim Basin distributes in a pocket shape horizontally. This is a very strange and interesting shape for a fault belt. After carful fault analysis on the basis of systematic seismic interpretation, three faulting phases were revealed in the fault belt. They are Permian normal faulting, end Permian-Triassic thrusting and Jurassic-Cretaceous normal faulting. Many normal faults with high dip-angle trending in NE-SW and NW-SE directions were formed in the studied area during the Permian continental rifting. They formed a conjugate fault system. Along the place of the present Yuenan fault belt, the normal faults in both NE-SW and NW-SE directions were intensified and finally jointed as one fault belt. In fact, the Yuenan fault belt is comprised of two group of normal faults. The block encircled by the fault uplifted and formed a large horst. The end Permian-Triassic thrusting induced by the collision between the Tarim continent and central Tianshan block, superimposed on the Yuenan fault belt, made its fault displacement larger. The block encircled by the fault belt uplifted for second time. The Jurassic-Cretaceous normal faults are the post-collision structures. They are small in scale and only seen on a few seismic profiles. The Jurassic-Cretaceous normal faulting influence the Yuenan fault belt slightly.
Key words:Permian normal fault/
End Permian-Triassic thrust/
Jurassic-Cretaceous normal fault/
Continental rift/
Syn-collision structure/
Post-collision structure/
Yuenan fault belt/
Northern Tarim Basin
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