腾格里地区盐湖的盐类沉积特征

腾格里沙漠122个盐湖分为石盐、石盐-芒硝、石盐-白钠镁矾及芒硝(石膏)4种类型。盐湖含盐系厚度一般4～9m,总体呈现下部为含盐碎屑沉积,上部以盐类沉积为主,构成储卤层,卤水赋存其中,由湖岸至湖心储卤层厚度增长。含卤层理渐小,卤水含KCl渐高。盐湖中矿物主要为碳酸盐矿物,以芒硝、石膏为主的硫酸盐矿物、石盐以及粘土矿物。盐湖卤水以晶间卤水为主。许多卤水含K+大于2g/L。K+含量最高的红盐池,平均含量达19.14g/L。对钾矿而言,在盐湖分布相对集中地区,有一定的综合开发利用前景。

SALINE DEPOSIT FEATURES OF SALT LAKES IN TENGGELI REGION

The 122 salt lakes in Tenggeli Desert can be divided into four types,halite,halite-mirabilite,halite-astrachanite and mirabilite. The thickness of the salt series is about 4～9meter. The lower of the lake is the salt-bearing clastic deposit,while the upper is salt deposit,both of which made up of the brine reservoir. From the bank of the lake to the center,the thickness of the reservoir became larger,the salt-bearing bedding became smaller and the content of KCl in the brine became higher. The minerals in the lake are carbonate minerals,sulfate minerals with mirabilite and gypsum,halite minerals and clay mineral. Most of the brine in the lake is intercrystalline brine,content of K+ is more than 2g/L. In Red Salt Lake,the average content is 19.14g/L. In the lake regions,it is favorable to prospecting potassium deposit.