龙川江盆地砂岩型铀矿铀赋存形态研究  

Occurrence Forms of Uranium in the Sandstone Type Uranium Deposit in the Longchuanjiang Basin

作　　者：夏彧[1] 周恳恳[1] 伍皓[1] 陈小炜[1] 张建军[1] 李晋文 孔然 XIA Yu;ZHOU Ken-ken;WU Hao;CHEN Xiao-wei;ZHANG Jian-jun;LI Jin-wen;KONG Ran(-Chengdu Center,China Geological Survey,Chengdu 610081;-Yunnan Institute of Coal Geological Exploration,Kunming 650218;-No.209 Geological Party,CNNC,Kunming 650218)

机构地区：[1]中国地质调查局成都地质调查中心,成都610081 [2]云南省煤炭地质勘查院,昆明650218 [3]云南省核工业二O九地质大队,昆明650218

出　　处：《四川地质学报》2018年第2期264-269,共6页Acta Geologica Sichuan

基　　金：中国地质调查局项目"西南地区铀矿调查选区及含煤岩系放射性地质环境调查"(DD20160133)资助

摘　　要：对龙川江盆地南部新获砂岩型铀矿工业矿体开展铀赋存形态研究表明,不同矿段铀成矿作用与赋矿主岩特征有关,且矿体总体适合采用地浸开采。铀品位高低与活性铀比例无明显相关性,后期开发应综合考虑两者关系,优选开采方案。扫描电镜与电子探针分析结果表明,铀矿段中残渣态铀的矿物种类主要以铀石为主,呈微细粒侵染状赋存、分散吸附于碎屑物表面,一般于蚀变黑云母、砂岩胶结物中较富集。其它,如铀钍石、变种独居石等独立含铀矿物常与石英、黑云母、黄铁矿共生,镶嵌于矿物解理面与裂隙之中。Research on occurrence forms of uranium in the newly found sandstone type uranium deposit in the Longchuanjiang basin indicates that the uranium ore-formation is related to the host rock. The deposit may be mined by in-situ leaching technique. SEM and EMPA show that the residual minerals are dominated by coffinite which occurs mainly in cracks or cleavages of biotite. Others, such as uranothorite and monazite are often associated with quartz, biotite and pyrite, embedded in cleavage and fissure of biotite.

关 键 词：砂岩型铀矿 赋存形态 龙川江盆地 

分 类 号：P619.14[天文地球—矿床学] P584[天文地球—地质学]