塔中低凸起古生界构造特征及演化

The Paleozoic Structural Features and Its Evolution of in the Tazhong Low Uplift,Xinjiang

塔中低凸起经历了多期构造运动的叠加和改造,古生界构造特征总体以南北对冲挤压为特点,形成南北两大弧形构造体系,在弧形构造体系上发育晚奥陶世台地边缘沉积。早海西期大规模逆冲逆掩构造由于受东西向区域应力不一致的控制,表现出一定程度的上下地质结构的变异,并形成了呈NNE走向的走滑断裂体系,控制了研究区纵向分层、南北分带、东西分块的构造格局。中新生代构造运动导致走滑断裂表现为西晚东早,东部定型于晚海西期,西部定型于喜山期。多期次的构造作用,使研究区发育挤压收缩构造、走滑压扭构造两大类基本构造样式。

Tazhong low uplift experienced muhiphase tectonic movement and superimposed deformation in different geologic time. Counter-thrust and compress on both sides were the major forces to shape tectonic framework in the Paleozoic. Finally, the multiphase tectonic movement formed arc tectonic systems in the north and south of Tazhong, and sediment of platform margin deposited on the arc tectonic systems. In the early Hercynian, due to the different regional stress of east-west trending, the large-scale movement of thrust and over-thrust structure not only resulted in the formation of NNE strike-slip fault system, but also the change of geologic structure in the vertical section. In general, the movement of thrust fault dominated vertical style of geologic structure and formed structural belt in north and south. Strike-slip fauh split the area into different blocks as transmeridional direction. The Mesozoic-Cenozoic tectonic movement made the strike-slip fault reactivate. Final figure of west part shaped later than that of east, the east in the late Hercynian, while the west in the Himalayan. Due to muhiphase tectonic movement, two kinds of basic structural patterns developed in this area： thrust-compress structure, and strike-slip and compress-shear structure.