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一、前言大兴安岭是我国著名的山区之一,也是我国地质界公認的未开垦的处女地。山岭大致呈北东或北北东走向。南北长达1200公里以上,东西寬約400公里。一般海拔高度在900～1300
I. Introduction Daxinganling is one of the famous mountainous areas in China and is also recognized as an uncultivated virgin land in China’s geological community. The mountain is roughly north east or north east. North and south up to 1,200 km above the east-west width of 400 km. General altitude in the 900 ~ 1300