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吐木休克断裂位于塔里木盆地西部,是一条大型基底卷入型断裂构造带,构成塔里木盆地次级构造单元阿瓦提凹陷和巴楚断隆的分界。根据系统的地震资料解释,可以将吐木休克断裂分为西段、中段和东段3部分,各段构造特征有所差异。西段,为单一的基底卷入型高角度逆冲断层,倾向巴楚断隆;中段,除倾向巴楚断隆的主冲断层外,倾向相反的反冲断层越来越清晰,楔状冲断构造的轮廓逐渐显现出来。同时,在断层上盘还发育第四纪正断层;东段,倾向巴楚断隆的主冲断层,向上断至中寒武统,未断开中寒武统以上的地层,其冲断位移量完全为倾向阿瓦提凹陷的反冲断层所吸收,形成典型的楔状冲断构造。根据地震资料解释,认为吐木休克断裂带主要存在两期断裂构造:深部高角度基底卷入型逆冲断裂带和其上叠加的浅部正断层。前者形成于库车组沉积前,在库车组沉积期间持续活动,并在新近纪晚期定型;后者是本次研究首次发现的,形成于第四纪早中期,仅发育在吐木休克断裂带的中部。
The Tumian Shock fracture is located in the western part of the Tarim Basin. It is a large basement entangled fault zone and forms the boundary between the Awati Depression and the Bachu fault in the Tarim Basin. According to the seismic data interpretation of the system, the Tumian Shock fracture can be divided into three sections: the western section, the middle section and the eastern section. The structural features of each section are different. In the western segment, a single basal-infiltrated high-angle thrust fault tends to break the Bachu fault. In the middle segment, except for the main thrust fault that broke the Bachu fault, the reverse thrust with the opposite trend became clearer and clearer, and the wedge thrust The outline of the structure is gradually revealed. At the same time, Quaternary normal faults also developed on the upper fault plate. In the eastern segment, the main thrust fault that broke the Bachu uplift broke up to the middle Cambrian and did not disconnect the Middle Cambrian strata, The amount is completely absorbed by thrust tectonics inclined to the Awati depression, forming a typical wedge thrust structure. According to the interpretation of seismic data, it is considered that there are mainly two phases of fault structure in Tumen Shock Fracture Zone: deep high-angle basement thrust fault zone and shallow normal fault superimposed on it. The former was formed before the deposition of Kuche Group and continued its activity during the deposition of Kuche Formation and was finalized in the late Neogene. The latter was first discovered in this study. It was formed in the early and middle Quaternary period and developed only in Tumen Shock Fracture Central zone.