层间氧化带砂岩型铀矿地电化学异常形成机理及其找矿意义  

Formation Mechanism of Electro-geochemical Anomalies in Interlayered Oxidation Type Sandstone-hosted Uranium Deposit and Its Prospecting Significance

作　　者：柯丹[1] 刘洪军[1] 侯惠群[2] 吴国东[1] 郝伟林[1] 易超[1] 

机构地区：[1]核工业北京地质研究院中核集团铀资源勘查与评价技术重点实验室,北京100029 [2]中国核科技信息与经济研究院,北京100048

出　　处：《地质学报》2016年第12期3545-3553,共9页Acta Geologica Sinica

基　　金：国家重点基础研究发展计划(973计划)项目(编号2015CB453003)资助成果

摘　　要：层间氧化带砂岩型铀矿是我国主要的砂岩型铀矿类型之一,属全盲矿,找矿难度大。地电化学方法作为深穿透地球化学方法的分支之一,为隐伏铀矿勘查提供了新的技术手段,并在实际找矿中取得了明显的效果。研究表明,在隐伏砂岩型铀矿上方,存在着地电化学提取U元素异常。总结和分析了层间氧化带砂岩型铀矿形成的物理化学条件以及在实际试验中发现的铀矿上方地电提取铀异常特征,在前人提出的元素由深部向地表迁移机制的基础上,进一步归纳了砂岩型铀矿地电化学异常的形成机理。层间氧化带砂岩型铀矿上方地电提取U元素主要呈现为跳跃的锯齿状高值异常,可以作为深部铀矿找矿的指示标志。Interlayered oxidation type sandstone-hosted uranium deposit is one type of the uranium deposits. It is totally blind or concealed, which makes it is difficult to be detected. As one branch of the deep-penetrating geochemistry, the electro-geochemical prospecting has become an important and effective method and accomplished a lot of achievements in exploration for deep-buried uranium orebodies. Many studies indicate that there are existing electro-geochemical anomalies over known sandstone-hosted uranium deposits. The physical and chemical formation conditions of interlayered oxidation type sandstone-hosted uranium deposit are summarized and anal.yzed. Electro-geochemicai characteristics of U is introduced over known uranium deposits. Formation mechanism of electro-geochemical anomaly is introduced based on the known migration mechanisms and field results. The U anomaly of U deteeted directly above, which ore body is manifested as jumping U electro-geochemical can be regarded as prospecting indicator for concealed sandstone-hosted uranium deposit.

关 键 词：层间氧化带 砂岩型铀矿 地电化学 隐伏矿产 

分 类 号：P619.14[天文地球—矿床学]