地质学报2016，Vol.90Issue(2)：201-218,18.
氧化还原障在热液铀矿成矿中的作用
The Role of Oxidizing Reducing Barrier in Mineralization of Hydrothermal Uranium Ore
摘要
Abstract
Uranium is a volatile element,and the redox conditions control the migration and precipitation of uranium.In the oxidation environment,uranium is in the form of U6 + ,and in the form of U4+ in reduction condition.The oxidation state of six valence uranium is mainly in soluble uranyl carbonate / uranyl fluoride complexes form,in aqueous solution migration,and the reductive tetravalent uranium is mainly enriched and precipitated in the form of pitchblende and coffinite in the ore-forming.The formation of hydrothermal uranium requires an oxidation barrier,but also a reduction barrier,and the two are indispensable.First of all,the oxidation agent /oxidation barrier will form a large amount of uranium in uranium rich rock to form U6 + ,and dissolved into the water solution;Second,the highly oxidized uranium rich solution is reduced to U4+ ,when they met the reduction barrier,and U6 + is reduced to precipitation, which is enriched in uranium deposit.Although the previous researches have been made on the geochemical characteristics and redox reactions of uranium in uranium mineralization,it is found that there are still some fuzzy understanding, restricting the development of uranium metallogenic theory and the improvement of ore prospecting method.In this paper,the most important sandstone type,volcanic rocks type,granite type uranium deposits have been taken as the examples to been discussed.we summarize the main types of uranium mineralization related to the oxidation and reduction barriers,discussed the relationship between uranium and the red layer evaporite strata (oxidation barrier)and lamprophyre in mafic dykes (reducing barrier),and control mechanisms of ore,reveals the mechanism of symbiotic metallogenic basin uranium-coal,uranium-gas (oil),clarify the Weng Quangou boron,iron,uranium symbiotic genesis,and established different types of uranium mineralization models.关键词
氧化还原障/热液铀矿/红层(红盆)/中基性岩脉/铀-煤-油-气Key words
oxidation and reduction barriers/hydrothermal uranium deposit/red layers (red basin)/mafic dyke/Uranium-coal-oil-gas引用本文复制引用
李延河,段超,赵悦,裴浩翔,任顺利..氧化还原障在热液铀矿成矿中的作用[J].地质学报,2016,90(2):201-218,18.基金项目
本文得到国家自然科学基金项目（41473014）和公益性行业科研专项经费项目（201211074）资助。 （）
