柴北缘东段中、新生代构造物理模拟研究

根据柴达木盆地北缘区域应力场和断裂发育特征设计地质模型,对其东段两条典型地质剖面形成时的受力方式、主要断裂的形成和演化进行构造物理模拟实验。结果表明,柴北缘东段凸起具有两种成因机制:挤压过程中,由于基性岩层刚性强度不同,在上覆地层形成断冲、凸起构造(如大红沟凸起);基底软流物质上涌引起上覆地层凸起变形,凸起具有背斜构造的形态特征(如锡铁山凸起)。柴北缘东段断裂系统由两期构造运动形成,早期受燕山运动作用,形成的断裂以北倾南冲为主;晚期,受新构造运动作用,形成的断裂以南倾北冲为特征,断层主要分布在南侧一带。

Meso-Cenozoic Tectonic Structural Physical Simulation Research of The Eastern Section of North Qaidam Basin

According to the northern Qaidam basin regional stress field and fracture development characteristics of geological model design, the eastern of two typical geological section formed loading mode, the formation and evolution of the main fracture structure physical modeling experiment. The results showed that the east Qaidam basin has two kinds of genetic mechanism: Extrusion process, the basic rock strength of different rigidity, formed in the overlying strata break blunt, convex structure (such as the red channel bulge); Basal bulge in the overlying strata deformation caused by the flow of soft material upwelling, bump with morphological characteristics of anticline structure (such as solder iron mountain bump). East Qaidam fault system formed by two tectonic movement, the early yanshan movement function, fracture is mainly to the north, south subduction; Late, by the new tectonic movement, the north south of fracture of opposition for the characteristics of fault are mainly distributed in the south area.