青海省东草河地区铀矿化特征及找矿前景

东草河地区地处祁连-龙首山碱交代型铀成矿带，铀矿（化）体主要产于构造破碎带中，断裂构造多期次活动和碱交代岩的二次破碎是铀矿化形成的必要条件；通过对岩石样品的岩相学分析、电子探针分析，表明东草河地区的铀矿化为碱交代型；东草河地区具备地层、构造、岩浆岩、热液活动及围岩蚀变等有利成矿条件，围绕已发现的3条矿化蚀变带存在较好的找矿前景。

Character of uranium mineralization and the prospecting in Dongcaohe area of Qinghai province

Dongcaohe area is located in the alkali metasomatism type uranium metallogenic belt of Qilian-Longshou Mountain. Ore (mineralized) bodies occur mainly in the fractured zone. The multiple fracture activities and the secondary structural fragment of the alkaline metasomatism rocks are the precondition of uranium mineralization. Petrographic analysis and electron probe analysis of rock samples show that U mineralization in Dongcaohe area is the alkali metasomatism type. The area is superior in the ore-forming conditions, such as stratum, structure, magmatic rocks, hydrothermal activity and wall rock alteration. It is potential for further prospecting in surrounding of the three known U mineralization zones.