一、三河矿区水文地质概述 (一)地貌地质概况本地区位于大兴安岭西缘部分,其有中高山、低山及残留的第三纪以来的准平原面,于得尔布尔河两岸发育着不对称的阶地及河漫滩,并有沼泽地段,沼泽的主要咸因与多年冻土有直接关系。本区地层有第四纪冲积层、坡积层、残积层;下白垩纪石英斑岩、黑云母安山岩、粗面岩、上侏罗纪辉石安山岩,角闪岩、火山碎屑岩等。矿区内有北东 I. Overview of the hydrogeology of the Sanhe mining area (I) Geomorphic geology The area is located in the western margin of the Daxinganling Mountains. It has medium-high mountains, low mountains and remnant Quaternary since the Tertiary, and asymmetrical Of terraces and river floodplains, and swamp lots, the main salty of swamps and permafrost are directly related. Quaternary alluvial strata, stratigraphic and residual strata in this area include Lower Cretaceous quartz porphyry, biotite andesite, trachyte, Upper Jurassic pyroxene andesite, amphibolite and volcaniclastic rocks. North East mining area