卡姆斯特地区水文地质条件与铀成矿关系

Relationship Between Hydrogeological Conditions and Uranium Mineralization in Kamusite Area

卡姆斯特地区铀矿找矿工作取得了重大突破,发现喀拉萨依矿产地。前人对该区含矿建造、构造类型、铀源条件和控矿因素等进行了大量研究,但对地下水与铀成矿关系研究欠深入。研究水文地质条件与铀成矿关系,对扩大铀矿找矿成果和总结铀成矿规律,建立研究区找矿模式有重要意义。依据地下水赋存条件及分布规律,划分水文地质单元,总结水动力场特征;利用热力学计算水中铀存在形式,分析地下水化学特征,判断地下水所处氧化-还原环境。认为划分的4个水文地质单元具有相对独立的补给-径流-排泄体系,不同的水动力条件形成的层间氧化带和铀矿化规模不同。研究区具有较好的水文地球化学分带性,补给区地下水处于弱氧化环境,铀以溶解、迁移为主,水铀氧化-还原电位差和水中铀存在形式表明地下水处在氧化-还原过渡环境。铀水文地球化学环境发生重大变化的径流区是找矿有利地带。综合分析认为:喀拉萨依水文地质单元铀成矿最有利,红盆水文地质单元铀成矿较有利,5164水文地质单元铀成矿空间有限,4164水文地质单元铀成矿空间较小。

With the discovery of the Karasay deposit,uranium prospecting has made breakthrough in the Kamusite area.A lot of study was carried out on ore-bearing construction,structural type,uranium source conditions,and ore control factors in this area,but soldem study on reported on the relationship between groundwater and uranium mineralization.In order to summarize the uranium mineralization pattern and establish the prospecting mode for the study area,we divided hydrogeological units according to the groundwater storage conditions and distribution rules,and summarized the characteristics of hydrodynamic fields.By calculating the uranium occurring form in water with thermodynamics and analyzing the chemical characteristics of groundwater,the redox condition of recharge-runoff-discharge systems was discussed and divided in the Kamusite area.Four hydrogeological units were divided in the studying area which resulted in the difference of the interstratum oxidation zone and uranium mineralization scale.The Karasay hydrogeological unit is the most favorable subarea for uranium mineralization,the Red Basin hydrogeological unit is moderately favorable subarea for uranium mineralization,the 5164 hydrogeological unit is limited in uranium mineralization space,while the 4164 hydrogeological unit is believed poor in mineralization space.