康滇地轴中南段米易-元谋地区特富铀矿矿化特征及成因  

Mineralization Characteristics and Origin of Extra Rich Uranium Deposits in Miyi-Yuanmou Area,Middle-South Part of Kangdian Earth’s Axis

作　　者：孙悦 姚建 李巨初[3] 孙泽轩 SUN Yue;YAO Jian;LI Juchu;SUN Zexuan(Research Institute No.270,CNNC,Nanchang,Jiangxi 330200,China;Research Institute No.280,CNNC,Guanghan,Sichuan 618300,China;Chengdu University of Technology,Chengdu,Sichuan 610059,China)

机构地区：[1]核工业二七〇研究所,江西南昌330200 [2]核工业二八〇研究所,四川广汉618300 [3]成都理工大学,四川成都610059

出　　处：《铀矿地质》2021年第3期466-475,共10页Uranium Geology

基　　金：中国核工业地质局生产中科研项目“四川省攀枝花-米易地区高品位铀矿石产出特征及控矿因素研究”(编号:201638-5)资助。

摘　　要：康滇地轴中南段米易-元谋地区元古宇结晶基底中赋存有与混合-交代作用关系密切的铀矿床1个、铀矿点2个、铀矿化点1个。这些矿床、矿(化)点共同特点是铀矿化均产于古老的变质岩中,岩石发育强烈硅化,在岩石中可见大量晶质铀矿及次生铀矿物,矿石的铀含量一般在1.000%以上,构成康滇地轴中南段独具特色的产于混合岩中的特富铀矿。文章通过对其矿化特征的对比研究,分析矿化成因,认为区内矿化类型应属广义的不整合面型的断裂控制型,总体属构造热液型。区内存在多期次的成矿作用,既有变质作用晚期的变质热液作用下所形成的铀矿化,也有与地幔深部热液(流体)关系密切的铀矿化,属复合成因的铀矿化。There is one uranium deposit,two uranium occurrence and a uranium mineralization point in the crystalline basement of Miyi-Yuanmou area in the middle and southern sections of the Kangxi area.The common feature of these metallizations is that uranium mineralization is produced in ancient metamorphic rocks.Strong silicification of rocks,a large number of crystalline uranium deposits and secondary uranium minerals are visible in the rocks.The uranium content of these metallizations is generally above 1.000%.It is a unique uranium deposit produced in mixed rock in the middle and south section of the Kangxi area.In this paper,the mineralization characteristics,the mineralization causes are analyzed through comparative study.The mineralization should be the fracture control subtype of general unconformity type subordinated to hydrothermal genesis.Multiple stages of mineralization were recognized in the area,there is uranium mineralization formed by the metamorphic hydrothermal fluid in the late metamorphism,and also uranium mineralization is closely related to the deep hydrothermal fluid(fluid)in the mantle,The genesis is of complex mineralization.

关 键 词：康滇地轴 特富铀矿 矿化特征 矿化成因 

分 类 号：P619.14[天文地球—矿床学]