西天山阿吾拉勒地区下二叠统乌郞组火山岩为一套陆相火山岩,主要由基性火山岩和酸性火山岩组成,中性火山熔岩较少,表现出双峰式火山岩特征.研究表明,下二叠统乌郞组经碰撞后松弛拉张,伊犁地块拉伸出现陆内火山裂谷环境.该组地层广泛夹持火山岩及火山碎屑岩,表明早中二叠世地壳活动频繁,局部地段地壳拉伸,产生同沉积断层,该断陷盆地经历发生、发展和消亡全过程. The Lower Permian Wujian Formation volcanic rocks in the Utarale area of ​​the western Tianshan Mountains are a set of continental volcanic rocks, which are mainly composed of basic volcanic rocks and acidic volcanic rocks. The volcanic rocks of the neutral volcano show less bimodal volcanic rocks. After the collision, the Permian Loess Plateau was loosened and tensioned, and the extensional intracontinental volcanic rifting environment occurred in the Yili block.The volcanic rocks and volcaniclastic rocks were widely held in this formation, indicating that the early Middle Permian crustal activity was frequent and the local The crustal extension of the area produced synsedimentary faults, which experienced the whole process of occurrence, development and demise.