三塘湖盆地基底特征对砂岩型铀矿成矿条件的影响

Basement feature of Santanghu Basin and its effect on metallogenetic conditions for sandstone-type uranium deposits

三塘湖盆地具深层结晶基底和浅层褶皱基底的双重结构。盆地东部结晶基底的存在使盆地东部(岔哈泉以东)中新生代盖层变形较西部弱，盖层在南北向挤压过程中缩短量小，盖层沉积厚度较薄，地浸砂岩型铀矿的找矿目的层埋深较浅，其构造、水文地质成矿条件较西部有利。

Santanghu Basin consists of double layer structures,which include the lower crystal basementand the upper folded basement.Due to the existence of crystal basement in the eastern basin,the upperMeso-Cenozoic cover deforms more weakly than that in the western basin.This means the cover in theeastern part is of less deformation during compression period,thinner dispositional thickness,and shal-lower in depth.All these conditions make the prospecting target horizon in the eastern basin be favorablefor the ISL sandstone-type uranium deposits.