西藏格达乡盆地位于冈底斯构造带南东段, 地质构造环境典型, 为高原地区普遍发育的构造形态; 论文通过研究格达乡地区构造地质环境, 分析其内地质、可知: ①区内发育6条近南北向的大型断裂控制了工作区基本地质构造格架, 并影响区内空间结构; 断层发育方向以南北为主, 多为浅表层次脆性断层, 少量为东西向; 区内断层多为喜山期地质构造活动发育所致, 其中发育时间较晚的为喜山后期伸展运动形成的南北向正断层; ②区内构造环境演化史, 自侏罗纪主要有三期活动: 第一期为燕山晚期, 构造活动为挤压环境下, 形成的南北向褶皱形变; 第二期为喜山期早-中, 形成规模较大的EW走向的推覆构造和逆冲断层, 区域应力背景为挤压环境; 第三期为喜山期晚, 形成SN走向的地堑和正断层一系列构造体系, 主要为伸展体系下地质活动形成。本次研究结果对判别喜山构造期地质岩组在构造演化活动中的行迹提供了参考依据。

Gedaxiang Basin in Tibet is located in the south-eastern section of Gangdisi structural belt, with a typical geological and tectonic environment and a commonly developed tectonic pattern in plateau area. By studying the structural geological environment of Geda Township area and analyzing its internal geology, it can be seen that: (1) Six large-scale faults developed in the area control the basic geological and tectonic structure of the working area and affect the spatial structure of the area; The fault development direction is mainly north-south, mostly brittle faults at shallow surface level, and a few of them are east-west orientated. Most of the faults in the region are caused by the development of geological and tectonic activities in the Himalayan period, and the ones that developed later are the north-south oriented positive faults formed by the extension movement in the late Himalayan period. (2) There are three periods of tectonic environment evolution in the area of the evolutionary history, since Jurassic: the first period is the late Yanshan period, tectonic activity for the extrusion environment, the formation of north-south fold deformation under the compression environment; The second stage is early to middle mountain stage, which formed large scale EW-trending nappe structure and thrust fault, and the regional stress background is compressional environment. The third stage is the late Alpine stage, forming a series of tectonic systems of grabens and normal faults with SN strike, which were mainly formed by geological activities under the extensional system. The results of this study provide a reference for distinguishing the trace of geological rock group in the tectonic evolution of the Himalayan tectonic period.