纳米比亚欢乐谷地区白岗岩型铀矿矿物特征研究  

Research on the Characteristics of Uranium Minerals of Alaskite-type Uranium Deposit in the Gaudeanmus Area,Namibia

作　　者：陈金勇[1,2] 范洪海 陈东欢[1,2] 顾大钊[1,2] 王生云[1,2] 

机构地区：[1]核工业北京地质研究院,北京100029 [2]中核铀资源勘查与评价技术重点实验室,北京100029 [3]南京大学成矿作用国家重点实验室,南京210093

出　　处：《地质论评》2013年第5期962-970,共9页Geological Review

基　　金：非洲中南部古老地块铀矿综合识别评价技术及应用研究项目的成果

摘　　要：本文通过系统的岩矿鉴定和电子探针分析,对纳米比亚欢乐谷地区白岗岩型铀矿的矿物特征进行了详细的研究。该地区铀的赋存形式以独立铀矿物为主,少量以类质同像形式存在于钍矿物中。铀矿物的主要种类有:晶质铀矿、钍铀矿、铀石、铀钍石、钛铀矿、沥青铀矿、硅钙铀矿和钒钾铀矿等,其中,晶质铀矿、钍铀矿和钛铀矿等原生铀矿物约占69%,而反应边状铀石、铀钍石、沥青铀矿、钒钾铀矿和硅钙铀矿等次生铀矿物约占31%。由此可见,该区铀矿化主要表现为原始岩浆的分异作用与后期热液改造作用的相互叠加,其热液改造程度不大,仅使铀发生内部再分配。Based on microscope and electron microprobe techniques, this paper studies in detail the characteristics of uranium minerals of alaskite-type uranium deposit in the Gaudeanmus area, Namibia. The results indicates that uranium mainly exists as independent uranium minerals, and partially exists in thorium minerals as isomorphic form. The uranium minerals are uraninite, thor-uraninite, coffinite, uranothorite, brannerite, pitchblende, uranophane and carnotite. The primary uranium minerals, such as uraninite, thor-uraninite and brannerite, account for about 69%, and the secondary uranium minerals, such as coffinite, uranothorite, pitchblende, uranophane and carnotite, approximately account for 31%. To sum up, uranium mineralization manifests multiplex affects of primarily magmatism and later hydrothermal reformation and hydrothermal reformation is not strongly by which uranium was merely redistributed internally in the study area.

关 键 词：独立铀矿物 类质同像 白岗岩型铀矿 纳米比亚欢乐谷地区 

分 类 号：P619.14[天文地球—矿床学]