西天山艾肯达坂地区较好发育了艾肯达坂组红色陆相火山岩建造,它不整合在下石炭统大哈拉军山组之上,未经变形和变质,属于陆陆碰撞晚期的橄榄安粗岩系,其年龄确定是厘定从碰撞造山向陆内构造演化的关键。因此,通过16件新获得的钾氩年龄测值,确定艾肯达坂组火山岩系形成在260Ma～270Ma之间,属早二叠世,而不是过去认为的石炭纪;西天山的陆陆碰撞应在二叠纪末结束,此后进入陆内造山阶段。 The western Aizandan Aiken Daban area is well developed Ai Ke Daban red terrestrial volcanic rock construction, it does not conform to the Lower Carboniferous Dahalajun group, without deformation and metamorphism, belong to the late land-continent collision olives The determination of the age of a burial rock series is the key to determining the evolution from collisional orogen to intracontinental tectonics. Therefore, 16 newly-obtained dating values ​​of potassium and argon indicate that the volcanic rocks of the Aikandabashan Formation formed between 260Ma and 270Ma and belonged to the Early Permian instead of the Carboniferous previously thought. The continental-continental collision It should end at the end of the Permian period and thereafter enter the intracontinental orogeny.