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论述区的范围主要在东经96°～101°30′,北纬28°～32°之间,为了说明问题有时也涉及边邻地区。该区的主要构造特征笔者1974年在编写1:100万昌都幅区域地质报告构造部分时曾作过描述。近年来随着地质工作的深入,进一步积累了大量新的地质矿产资料,故有可能对其中一些问题作补充和重新认识。本文因篇幅限制仅着重从沉积和岩浆活动两个方面说明问题,而对构造形迹和变质作用的描述较简。本区因有三江(即金沙江、澜沧江和怒江)贯穿,且总体为一个弧顶向北东凸出的弧形,故名三江弧形构造(图1)。其中以马尼千戈—理塘—康乌、岗拖—雅洼—奔子栏和怒江等三个超壳断裂为界可划分出义敦、昌都和察隅等三个构造区,它们的地质构造特征和演化历史既各具特色,又相互连系。
The scope of the discussion area is mainly between 96 ° ~ 101 ° 30 ’east longitude and 28 ° ~ 32 ° north latitude. In order to illustrate the problem, it sometimes involves the adjacent areas. The main structural features of the area described by the author in 1974 when he wrote the structural part of the 1: 1 million Changdu-area regional geological report. In recent years, with the deepening of geological work, a great deal of new geologic and mineral resources have been further accumulated, so it is possible to supplement and re-understand some of these problems. Due to space limitations, this paper only focuses on two aspects of sedimentary and magmatic activity, but the description of tectonic trace and metamorphism is simpler. Due to the Sanjiang (ie, Jinsha River, Lancang River and Nu River) runs through the area, and the arc is generally a curved arc to the north-eastern convex, named Sanjiang arc structure (Figure 1). Among them, three tectonic zones of Yidun, Qamdo-Kangwu, Gangtuo-Yawa-Benzilan and Nujiang are divided into three tectonic zones of Yidun, Qamdo and Chayu, and their Geological structure and evolution of the history of both distinctive, but also linked to each other.