伊犁盆地水文地质条件与铀成矿的关系

砂岩型铀矿是一种水成矿产，研究盆地水文地质条件与铀成矿的关系对揭示铀成矿规律和预测铀成矿靶区十分重要。以伊犁盆地为例，根据盆地地下水系统演化特征分析了不同地质时期铀成矿的水动力条件，运用水文地球化学测试技术分析了地下水化学特征及铀成矿的水化学条件，结合铀矿勘探钻孔资料，统计分析了铀储层及其内部层间氧化带的发育特征与铀矿分布的关系，揭示了盆地内部不同部位、不同时代铀储层的铀成矿水文地质条件的差异以及铀成矿的有利区段。结果表明:空间上，盆地西南部构造稳定，铀储层规模大、连续性好，铀成矿作用的持续性好，具有最有利的铀矿富集的水文地质条件；东南部次之，北部的铀成矿条件最弱。各铀储层中，西山窑组的铀成矿条件最好，八道湾组次之，小泉沟群最弱。 

Relationship between uranium mineralization and hydrologic condition in Yili Basin

The sandstone-type uranium deposit is a kind of hydro-sedimentary mineral. It is very important to study the relationship between the hydrogeological conditions and uranium mineralization to reveal the uranium metallogenic regularity and predict the target area of uranium ore.Yili Basin is taken as an example, the hydrodynamic conditions of uranium mineralization in different geological periods are analyzed according to the evolution characteristics of groundwater system. Hydrogeochemical techniques are used to analyze groundwater chemical characteristics and hydrogeochemical conditions of uranium mineralization. The relationship between the distribution of uranium deposits and the development characteristics of uranium reservoirs and interlayer oxidation zones are statistically analyzed according to uranium exploration drilling data. It reveals the spatial differences of uranium ore-forming hydrogeological conditions among uranium deposits of different ages, and the favorable position of uranium mineralization. It indicates that the southwestern basin is the most advantageous part for uranium richness because it has stable geological structure and large-scale uranium reservoir with good continuity, which is beneficial for continual uranium mineralization. The southeast is the second favorable part for uranium richness, and the northern uranium mineralization conditions are the weakest. From the perspective of different uranium reservoirs, the uranium metallogenic conditions of Xishanyao Formation is the best, followed by Badaowan, and the Xiaoquangou group is the weakest.