粤东桃源铀矿床矿物组合特征及其地质意义  

Uranium occurrences and its geological significance in the Taoyuan uranium deposit in eastern Guangdong

作　　者：江卫兵[1] 林坤[1] 李海东 孙中瑞[1] 彭渤洋[1] 尹征平 JIANG Weibing;LIN Kun;LI Haidong;SUN Zhongrui;PENG Boyang;YIN Zhengping(Research Institute NO.290,CNNC,Shaoguan 512029,Guangdong,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,Jiangxi,China)

机构地区：[1]核工业二九〇研究所,广东韶关512029 [2]东华理工大学核资源与环境国家重点实验室,江西南昌330013

出　　处：《矿产勘查》2021年第11期2207-2214,共8页Mineral Exploration

基　　金：中国核工业地质局项目(编号:201925、201925-2);东华理工大学项目(编号:NRE1904)联合资助。

摘　　要：桃源矿床是位于长塘火山盆地西侧的中型热液铀矿床。对其开展铀矿物组成研究对探究矿床成因具有重要的意义。在野外和显微镜观察基础上,利用电子探针分析手段对矿床成矿元素铀赋存状态和矿物共生组合进行研究。结果显示,铀的存在形式以独立铀矿物为主,主要为沥青铀矿、铀石,其次为钛铀矿。铀矿石具有5种不同的矿物组合类型:沥青铀矿-赤铁矿-微晶石英组合、沥青铀矿-铀石-紫黑色萤石组合、沥青铀矿-铀石-黄铁矿组合、钛铀矿-金红石-绿泥石组合、铀石-钠长石组合。这种矿物组合的多样性,反映了该矿床热液流体活动的长期性和复杂性,即成矿热液流体作用具有多阶段性。结合铀矿物的相互穿插关系和矿物组合特征,该矿床至少存在两期铀矿化,且铀矿化与硅化、赤铁矿化、紫黑色萤石化、黄铁矿化、方解石化等关系密切。铀矿物共生组合特征以及沥青铀矿元素含量特征表明该矿床形成于中低温偏还原环境。Taoyuan deposit is a medium-sized hydrothermal uranium deposit,it located on the west side of the Changtang volcanic basin.The study of uranium mineral composition is of great significance to enrich the genesis of the deposit.On the basis of detailed field and microscope observations,use electron probe analysis to study the occurrence state and mineral symbiosis combination of the ore-forming element uranium.The results show that uranium mainly existed as independent uranium minerals,mainly as pitchblende and coffinite,some as brannerite.Uranium ore has 5 different mineral combinations:bituminous uranium-hematite-Uranium-rutilechlorite combination,uranium-albite combination.The ore consist of microcrystalline quartz combination,bituminous uranium-uranium-purple black microcrystalline quartz combination,bituminous uranium-uraniumpurple black fluorite combination,bituminous uranium-uranium-pyrite combination,titanium five kind mineral combination,the diversity of uranium ore mineral combination reflects the long-term and complex activity of hydrothermal fluid in the deposit,which also indicate the multiphases and variety of fluid composition.There are at least two periods of uranium mineralization.Alteration related with uranium mineralization are siliconization,hematization,purple-black fluoritization、pyritization,calcitization,sericitization and chloritization,etc.

关 键 词：电子探针 铀的存在形式 矿石矿物组合 成矿环境 桃源铀矿床 

分 类 号：P619.14[天文地球—矿床学]