铀矿地质2025，Vol.41Issue(4)：637-650,14.DOI:10.3969/j.issn.1000-0658.2025.41.044
贵州下约铀矿床岩石地球化学特征及其指示意义
Geochemical Characteristics and Its Implications of Xiayue Uranium Deposit in Guizhou
摘要
Abstract
Xiayue uranium deposit is the only carbonaceous-siliceous-argillaceous type uranium deposit hosted in Permian coal-bearing strata in Guizhou,China.Research on its geochemical characteristics,metallogenic mechanisms,and genetic origins are quite limited.This study analyzes major trace,and rare earth elements in ores and wall rocks of Xiayue uranium deposit to investigate its metallogenic environment,material sources,mineralization mechanisms,and genesis.Results indicate that the chemical composition of ores and host rocks in Xiajiang uranium deposit is primarily dominated by SiO2,Al2O3,and TFe2O3,characterized by high SiO2 content,high LOI,and extreme depletion in CaO,MgO,Na2O,and K2O while the ores exhibit significant enrichment of U,Mo,and V,with U showing positive correlations with Cr,V,Mo,Pb,and Ni.Both ores and host rocks are rich in Light rare earth elements(LREEs)and depleted in heavy rare earth elements(HREEs)with negative Eu anomalies.Redox environmental indictor of U/Th,δU,V/(Ni+V),Cu/Zn,and Ni/Co,along with salinity and acidity indicators of CaO/(CaO+TFe2O3),MgO/TFe2O3,(CaO+MgO)/(SiO2+Al2O3),and MgO/Al2O3×100,collectively suggest that Xiayue uranium deposit was formed in an anoxic reducing environment with low-to-moderate salinity,acidic,transitional continental-marine sedimentary environment,which facilitated the uranium enrichment and precipitation.Genetic analysis reveals that the deposit was closely related to tectonic modification and subsequent leaching and accumulation processes.The uranium sources are multi-origin and deep-seated:Some uranium derives from uranium-rich strata within the region,while another portion likely originates from deep-seated uranium-bearing fluids.Comprehensive analysis proposed that Xiayue uranium deposit underwent three stages of mineralization:syngenetic sedimentation,diagenetic pre-enrichment,and late-stage leaching-accumulation in later structural modification.The deposit was classified as a sedimentary-diagenesis superposed by structural modification and leaching enrichment uranium deposit.关键词
元素地球化学/还原环境/构造改造/淋积作用/下约铀矿Key words
elemental geochemistry/reducing environment/structural modification/leaching-enrichment/Xiayue uranium deposit分类
天文与地球科学引用本文复制引用
张小强,卫永华,郭敏,刘路,赵亚云..贵州下约铀矿床岩石地球化学特征及其指示意义[J].铀矿地质,2025,41(4):637-650,14.基金项目
中国地质调查局地质调查项目(编号:DD20160127-06)资助. （编号:DD20160127-06）
