桂西南碳硅泥岩型铀矿赋矿地层沉积特征  

Ore-hosting sedimentary strata features of carbonate-siliceous-argillaceous rock uranium deposit in Southwest Guangxi

作　　者：李晓友 江芝莹 叶武 LI Xiaoyou;JIANG Zhiying;YE Wu(Guangxi Nuclear Geological Party No.305,Liuzhou 545000,Guangxi,China)

机构地区：[1]广西壮族自治区三〇五核地质大队,广西柳州545000

出　　处：《矿产与地质》2024年第2期257-263,共7页Mineral Resources and Geology

基　　金：广西壮族自治区地质矿产勘查开发局“广西X矿资源勘查关键技术研究人才小高地”(桂地矿综研〔2024〕6号)项目资助。

摘　　要：桂西南地区是我国华南重要的碳硅泥岩型铀矿床产出区,区内产铀地层沉积建造与铀成矿作用的关系,对该区勘查找矿具有重要意义。在综合前人资料的基础上,通过野外地质调查、剖面对比分析该区产铀地层特征并阐明桂西南地区不同地段铀成矿主含矿层的沉积环境,进而总结地层沉积建造与铀成矿作用的关系。研究表明,该区铀矿化层位具有多层性,但不同地段铀成矿对层位有一定的专属性,且在空间展布上有一定的规律性;不同地段铀矿成矿主含矿层的沉积环境有滨海局限台地相、浅海陆棚碎屑岩相、浅海浅水台地相、浅海较深水台盆相沉积;且不同沉积环境下地层沉积建造对铀成矿作用具有明显的控制作用。Southwest Guangxi is an important area of carbonate-siliceous-argillaceous rock uranium deposit in South China block.It has great signifiance for exploration and prospecting in this area on the relationship between the sedimentary construction of uranium-bearing strata and uranium mineralization.With field geological survey and section comparison,this paper analyzes the characteristics of uranuum-producing strata and expounds the sedimengtary environment of main ore-bearing strata in different sections of uranium mineralization in Southwest Guangxi on the basis of summizing previous materials.Furthermore,the relationship between the sedimentary formation and uranuum mineralization is summarized.The study shows that the uranium mineralization horizon in this area is multi-layered,but the uranium mineralization in different zones is specific to the horizon and has certain regularity in spatial distribution.The depositional environments of the main ore-bearing beds in different sections of uranium deposits area Binhai limited platform facies,shallow shelf clastic rock facies,shallow water platform facies and shallow water deeper platform basin facies.In addition,the stratigraphic and sedimentary constructions have obvious control effect on uranuum mineralization in different sedimentary environments.

关 键 词：铀矿 碳硅泥岩 成矿层位 专属性 沉积建造 桂西南 

分 类 号：P619.14[天文地球—矿床学]