该区位处大兴安岭火山岩带的中段,据近年的区调成果证实,区内不但中晚侏罗世曾发生强烈火山活动,新生代的火山活动也甚为频繁。新生代火山岩分布于北纬46°—48°、东经119°00′—121°30′范围内,这一带最高山峰1745.2m,一般在1400—1600m之间,山脉东南侧发育洮儿河、哈布气河等一系列北 The area is located in the middle section of the Daxinganling volcanic belt. According to the results of the regional adjustment in recent years, it has been confirmed that intense volcanic activities have taken place in the area not only in the mid-late Jurassic but also in the Cenozoic volcanoes. The Cenozoic volcanic rocks are distributed in the range of latitude 46 ° -48 ° north latitude and longitude 119 ° 00’-121 ° 30 ° east longitude. The highest peak in this zone is 1745.2 m, usually between 1400-1600 m. The Mohe River, Gas River and a series of North