通过对近年新获得的航磁、重力、大地电磁测深和地质等资料的综合研究揭示,羌塘西部隆起查桑段具有明显的南北分带、东西分块和垂向分层的结构、构造特征。该区总体由两(东部)、三(西部)个东西向展布的大型南倾构造块体推覆叠置而成,其间又被数条近南北向断裂分割为若干个断块。各块带出露地层时代、结构构造和地球物理场特征有较大差别。在查桑段及邻区,地壳中上部有两个低阻层,所在的深度分别为15±5km和约40km之下。壳内上部低阻层主要分布在查桑段及其以南,为各块体总体向北运动和逆掩叠覆之底部主拆离推覆面,该区各南倾大断裂均向下收敛并交会到该层。下部低阻层的展布超出了查桑段,向北已达北羌塘坳陷,其影响的范围可能更为广阔。此南北分带、多块叠置的结构和复杂多变的地球物理场特征,仅孤零零地出现在双湖—绒马之间,不具区域意义。其形成与该区东、西两侧中生代始存在的近南北向转换断层和晚古生代可能曾发育有裂谷之背景密切相关。该区段挤压变形和叠覆隆升,始于早白垩世羌塘盆地反转期;始新世以来,印度板块碰撞遂继续向北推挤,又得到进一步的发展、加强及改造。 Based on the newly obtained data of aeromagnetic, gravity, magnetotellurism and geology in recent years, it is revealed that the Qichaang uplift in the western Qiangtang has obvious north-south zoning, east-west division and vertical stratification structure and structure feature. The area is generally composed of two large (southern), three (western) east-west distribution of large-scale southern thrust tectonic block superimposed, during which was divided into a number of nearly North-South fault fracture blocks. Each block with exposed strata era, structural characteristics and geophysical field characteristics are quite different. In the Chashan section and its adjacent area, there are two low resistivity layers in the upper part of the crust at depths of 15 ± 5km and about 40km respectively. The low resistivity layer in the upper part of the crust is mainly distributed in the Cha Cha segment and the south of the crust, and is the main detachment thrusting surface at the bottom of the block moving northward and overthrusting. Meet to this level. The distribution of the lower resistive layer extends beyond the Chasan segment and reaches the North Qiangtang depression to the north, possibly with a broader impact. This north-south zoning, multiple superimposed structures and complex and ever-changing characteristics of the geophysical field appear only in the shores of Shuanghu-Maomao with no regional significance. Its formation is closely related to the near-north-northward transformation faults existing in the Mesozoic from the east and west sides of the area and the background that the late Paleozoic may have developed rifts. The extrusion deformation and overgrowth in this section started in the inversion period of the Early Cretaceous Qiangtang basin. Since the Eocene, the Indian plate collision continued to push northwards and further developed, strengthened and reformed.