准噶尔盆地西缘车排子凸起构造演化及断层形成机制

doi:10.13278/j.cnki.jjuese.201504116

摘要/Abstract

摘要：

结合区域构造地质背景,采用现今构造静态描述与构造演化过程剖析相结合的研究思路,分析了车排子凸起的几何学与运动学特征,剖析了车排子凸起的构造演化过程,探究了构造演化过程控制下不同类型断层的形成机制.结果表明:车排子凸起之上发育两套断裂系统,即海西印支期形成的断穿石炭系白垩系底的逆断层,喜马拉雅期形成的断穿白垩系、古近系和新近系的正断层.车排子凸起构造演化过程可以划分为强烈隆升剥蚀阶段(C₃J)、缓慢沉降阶段(KE)、局部伸展阶段(NQ)3个阶段,这3个阶段的构造应力背景具有差异性,导致不同阶段形成的断裂体系和地层厚度差异性明显.C₃J时期,车排子凸起处于向东推覆的逆冲褶皱带上,发育向东逆冲的红车断裂带和断穿石炭系白垩系底的逆断层,无地层沉积;KE时期,红车断裂带的右旋压扭活动使车排子凸起处于逆冲楔顶部带,受北东向挤压,先期逆断层有的继承性持续发育,有的停止发育,还有的发育一段时间后停止发育,并形成盲冲断层,地层从南东向北西沉积尖灭;NQ时期,北天山向北强烈挤压隆升的作用使车排子凸起处于前缘隆起带,一些逆断层发生负反转,同时在NQ发育大量正断层,受凸起向南倾作用,地层南厚北薄.

关键词: 准噶尔盆地, 车排子凸起, 红车断裂带, 断层, 断层发育机制

Abstract:

Depending on the geographical background, the author discusses the structural evolution combined with the present static structural description. The features of geometry and kinematics of Chepaizi uplift are analyzed, as well as its structural evolution process. The different types of dislocation mechanisms are studied for their structural evolution. The results show that there were two fault systems developed on Chepaizi uplift, namely the reverse fault of Carboniferous-Cretaceous formed during Haixi-India period,and the normal fault of Cretaceous-Third system formed in Himalayan period. The structural evolution of Chepaizi uplift can be divided into three periods: C₃-J, K-E, and N-Q. The structural stress background of the three periods have some differences. This resulted in the significant differences of the fault systems and their geographical depths. In the stage of C₃-J, located in the eastward nappe thrust fold belt, Chepaizi uplift thrust into the east thrust Hongche fault belt without stratigraphic deposition.In the stage of K-E, due to the right-handed rotary pressing and twisting of the Hongche fault belt, Chepaizi salient was pressed onto the top belt of the thrust wedge from the northeast direction. Some of the earlier thrust faults developed successively and sustainably, and some of them stopped developing, while some others developed intermittently and formed a blind thrust. The stratum layouts from northeast to northwest in this period.In the stage of N-Q, due to the northward pressing and uplifting of North Mount Tianshan, Chepaizi salient was pushed into the front uplift belt, and resulted in the occurrence of the negative reversal to some thrust faults. A plenty of normal faults were developed in the stage of N-Q. Affected by the southward inclining salient, the stratum presents thick in the south and thin in the north.

Key words: Junggar basin, Chepaizi uplift, Hongche fault zone, fault, fault development mechanism

中图分类号:

P542

董大伟, 李理, 王晓蕾, 赵利. 准噶尔盆地西缘车排子凸起构造演化及断层形成机制[J]. 吉林大学学报(地球科学版), 2015, 45(4): 1132-1141.

Dong Dawei, Li Li, Wang Xiaolei, Zhao Li. Structural Evolution and Dislocation Mechanism of Western Margin Chepaizi Uplift of Junggar Basin[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(4): 1132-1141.

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