十红滩铀矿床层间氧化带尖灭区Se,Re,Mo的富集特征与机理  

Enrichment Mechanism of Selenium、Rhenium、Molybdenum in the Pinch-out Area of Interlayer Oxidation Zone in Shihongtan Uranium Deposit

作　　者：武正乾 王居里[1] 周伟 曹雷 

机构地区：[1]西北大学地质学系,陕西西安710069 [2]核工业二○三研究所,陕西咸阳712000

出　　处：《东华理工大学学报（自然科学版）》2017年第2期126-131,共6页Journal of East China University of Technology(Natural Science)

基　　金：国家科技支撑计划项目(305项目)子专题(2011BAB06B07-02);中国核工业地质局铀矿勘查项目(201345)

摘　　要：以十红滩铀矿床为例,阐述了层间氧化带尖灭区伴生元素Se,Re,Mo的含量特征和分布规律。研究表明伴生元素Se,Re,Mo在空间上与砂岩U矿体密切共生,层间氧化作用可以促使伴生元素Re,Se,Mo超常富集。Se,Mo与U在还原环境下具有相似的地球化学性质,而在氧化环境下地球化学行为不同;Re与U在氧化还原过程中具有相似的地球化学特征。在层间氧化分带剖面中地球化学介质Eh值逐步降低的位置,可清楚看出成矿元素有下列顺序:Se-U-Re-Mo。因此,层间氧化成矿作用是一种成矿的新机制,十红滩铀矿床不单是一个铀矿床,而且是一个与层间氧化成矿作用有关的多元素聚集的复合砂岩矿床。The study of Shihongtan uranium ore deposit, shows contents and distribution of associated element Se, Re, Mo in the pinch-out area of interlayer oxidation zone. It is concluded that, associated elements （ Se）, rhenium （ Re）, molybdenum （Mo） are characterized by associated with uranium orebodies, interlayer oxidation can promote the super-richening of associated elements Re, Se, Mo. Se, Mo and U have similar geochemical properties at reduc- ing environment, and in an oxidizing environment in different geochemical behavior; Re and U have similar geo- chemical characteristics of the redox process, the position of geochemical media Eh values gradually lowered in the interlayer oxidation zonation sectional view, can be clearly seen that ore-forming elements have the following order： Se-U-Re-Mo. Therefore, Interlayer oxidation is a new type of metallogenetic mechanism, Shihongtan uranium deposit is not only a uranium deposit, and is a a layer between the multi-element oxide mineralization related to aggregation of composite sandstone deposit.

关 键 词：SE RE MO 富集机理 层间氧化 砂岩型铀矿 十红滩 

分 类 号：P619.14[天文地球—矿床学]