索曲流域现代河流阶地对南羌塘陆块新构造运动的反演  

Conversion of Neotectonic Movements in South Qiangtang Block from Modern River Terraces of Suoqu Drainage

作　　者：贾建称[1] 李建伍[1] 王根厚[2] 李秋实[2] 于海量[2] 

机构地区：[1]中国煤炭科学研究总院西安分院,陕西西安710054 [2]中国地质大学地球科学与资源学院,北京100083

出　　处：《东华理工学院学报》2006年第1期17-21,共5页Journal of East China Institute of Technology

基　　金：中国地质调查局1:25万仓来拉幅(146c004003)区域地质调查项目(200313000001)

摘　　要：索曲流域位于南羌塘陆块东部,由发源于唐古拉山南坡的本曲、索曲、连曲和益曲等四条贯通性河流组成,是怒江上游面积最大的汇水区域。流域内现代河流及河流阶地十分发育。对比研究流域上游、中游和下游河流阶地的发育程度、类型、级别和阶地的构造变形特征,结合区域构造背景,笔者提出南羌塘陆块新构造运动主要形式是在总体隆升背景下,由南-南东向北-北西方向的断块式不均匀掀斜。这种运动形式是印度板块持续振荡式向北挤压、双湖—查吾拉断裂带与班公湖—怒江断裂带差异性活动联合作用的结果。Made up of Benqu, Suoqu, Lianqu, and Yiqu, which originate from the south of Tanggula mountain, Suoqu drainage area is the largest catchments section in Nujiang. Modern rivers and terraces develop extraordinary in the drainage. Researching of the developmental degree, type, level, and structural deformational feature of river terrace contrastively between the upriver and middle-lower reaches of the river, combining regional tectonic setting, the author of the paper put forward that the main form of tectonic movement of south Qiangtang block in Holocene epoch is under the background of tectonic upwarping, the block is tilted from south south-east to north north-west in block fault differential shapes. This kind of movement form was caused by India plate concussive extrusion towards north of the Eurasia plate. At the same time, It was restricted by the otherness movement between Shuanghu-Chawula fracture zone and Bangonghu-Nujiang fracture zone. Form and development of river terraces in this area are not only controlled by tilt movement in South Qiangtang block, but they are restricted by activity fault movement inter the block directly.

关 键 词：南羌塘陆块 索曲流域 河流阶地 新构造运动 

分 类 号：P546[天文地球—构造地质学]