塔吉克斯坦帕米尔地区构造单元划分及其特征

Tectonic Unit Division of the Pamir Area in Tajikistan and its Geological Characteristics

塔吉克斯坦帕米尔地区由一系列呈近东西向、向北凸出的弧形活动构造带构成,被称为"西构造结"。由于地缘关系及国内外研究程度差异,塔吉克帕米尔地区在构造单元属性及其与国内构造单元对比上仍存在分歧。本文在系统分析塔吉克帕米尔地区、昆仑和藏北地区区域地质调查和科研成果资料的基础上,结合野外地质调查,着重从物质组成、构造变形两个方面进行对比,以坦尼马斯、如山-帕沙尔特缝合带为界将塔吉克帕米尔地区自北向南划分为北帕米尔、中帕米尔、南帕米尔三个构造单元,其中北帕米尔进一步细化为北带、中带、南带,南帕米尔分为东南帕米尔和西南帕米尔。初步探讨了各单元构造属性,提出了与我国昆仑、藏北地区相邻构造单元的对接方案,为推进帕米尔地区区域地质研究提供支撑。

The Pamir area in Tajikistan is made up of a series of arc-shaped active tectonic belts with nearly EW-direction and northward convex,which has been called as the'Western Syntaxis'. Due to the differences in geography and research degree at home and abroad,some disagreements still exist about the tectonic unit properties of the Pamir area in Tajikistan and the comparison between Pamir and its adjacent tectonic units in China. Through systematical analysis of the regional geological survey and scientific research data of Tajik Pamir,Kunlun and northern Tibet,the Pamir area in Tajikistan has been divided into three tectonic units( North Pamir,Middle Pamir and South Pamir) from north to south with Tannymas and Rushan-Pshart sutures as their boundaries,combined with field geological survey and compared the material composition and structural deformation. And then,the North Pamir has been further divided into northern part,middle part and southern part,while the South Pamir has been divided into Southeast Pamir and Southwest Pamir.Finally,the structure attributes of various tectonic units have been discussed in this paper,and the docking scheme between various tectonic units in Pamir and their adjacent tectonic units in Kunlun and northern Tibet has been proposed,which provides some supports for studying the regional geology in the Pamir area.