五岔沟地区位于新华夏系第三巨型隆起带—大兴安岭之北缘。本区山高水急,沟深谷陡,河流强烈下切,“V”形谷发育,河谷阶地发育,山体多呈阶梯状,火山活动频繁,新第三纪至第四纪有七期玄武岩浆活动,形成北北东向展布的火山群带,并有冰川活动遗迹,从而造成大兴安岭地区现今特殊的地 The Wuchagou area is located at the northern margin of the Greater Hinggan Mountains, the third giant uplift of the Xinhuaxia Formation. In this area, the mountains are high and the water is steep, the valleys are deep and steep, the river is severely cut. The development of “V” shaped valleys and valleys in the valleys are mostly stepped. The volcanic activity is frequent. From Neogene to Quaternary, there are seven basaltic magmatic activities, North-east distribution of the formation of the volcanic group belt, and glacial activity remains, resulting in the Daxinganling region today special