文献类型：期刊文献

中文题名：黔北岩孔—松林地区牛蹄塘组含铀-钼-镍-钒-PGE黑色岩系地球化学特征及成因探讨

英文题名：Geochemical characteristics and genesis of U-Mo-Ni-V-PGE?bearing black rock series in Niutitang Formation of Yankong-Songlin area,northern Guizhou

作者：张小强 王友谊 程国繁 郭敏 卫永华

第一作者：张小强

机构：[1]贵州省有色金属和核工业地质勘查局七总队;[2]贵州理工学院资源与环境工程学院

第一机构：贵州省有色金属和核工业地质勘查局七总队

年份：2025

卷号：46

期号：11

起止页码：110-119

中文期刊名：黄金

外文期刊名：Gold

基金：贵州省公益地勘基金项目(黔国土资综合函〔2017〕257号);中国核工业地质局项目(2023-32);贵州省有色金属和核工业地质勘查局科研项目(201107)。

语种：中文

中文关键词：矿化类型;地球化学特征;还原环境;热水沉积;黑色岩系;牛蹄塘组;岩孔—松林地区;黔北

外文关键词：mineralization type;geochemical characteristic;reducing environment;hydrothermal sedimentation;black rock series;Niutitang Formation;Yankong-Songlin area;northern Guizhou

摘要：岩孔—松林地区是贵州省重要的碳硅泥岩型铀成矿区,也是镍、钼、钒、铂族元素(PGE)矿主要产区。有关该地区铀-钼-镍-钒-PGE矿化特征、地球化学特征等系统研究甚少。通过对岩孔—松林地区牛蹄塘组黑色岩系铀、钼、镍、钒、PGE矿化特征和微量元素、稀土元素进行分析,探讨了成矿环境、成矿作用、成矿物质来源和成矿机制及成因。结果表明:岩孔—松林地区矿化类型有U-P型、U-V型和U-Mo-Ni-PGE型3种;矿石中U、Mo、V、As、Sb、Ba元素明显富集;轻稀土元素富集,重稀土元素亏损,Eu表现为正异常,Ce表现为负异常;氧化还原环境判别指标w(U)/w(Th)值、δU、w(V)/w(Sc)值、w(V)/w(Cr)值、w(Ni)/w(Co)值、w(V)/w(Ni+V)值、w(Cu)/w(Zn)值均反映含铀-钼-镍-钒-PGE岩系形成于缺氧、闭塞的还原环境;Ba、Sb、As热水指示元素富集情况和w(U)/w(Th)值、δEu、δCe,以及w(Zn)-w(Ni)-w(Co)三角图解显示,铀、钼、镍、钒、PGE成矿与热水沉积作用有关;成矿物质来源具有多源性和深源性,铀部分来自于富铀地层岩石,部分来自深源含铀、钼、镍、钒热液流体。综合分析认为,U-Mo-Ni-PGE型矿化多形成于喷流沉积作用,U-V型矿化多形成于同生沉积、同生富集+淋积改造作用,U-P型矿化多形成于同生沉积+热改造作用。
The Yankong-Songlin area is an important region in Guizhou Province for carbonaceous-siliceousargillaceous rock-type uranium mineralization and a major production area for nickel,molybdenum,vanadium,and platinum group elements(PGEs).Systematic studies on the mineralization characteristics and geochemical features of U-Mo-Ni-V-PGEs in this area remain limited.Through analysis of U,Mo,Ni,V,and PGE mineralization characteristics,trace elements,and rare earth elements in the black rock series of the Niutitang Formation in the Yankong-Songlin area,the metallogenic environment,mineralization processes,material sources,and genetic mechanisms were investigated.Results indicate three mineralization types in the Yankong-Songlin area:U-P type,U-V type,and U-Mo-Ni-PGE type.Elements U,Mo,V,As,Sb,and Ba show significant enrichment in ores.Light rare earth elements are enriched while heavy rare earth elements are depleted,with Eu exhibiting positive anomalies and Ce showing negative anomalies.Redox environment indicators including w(U)/w(Th),δU,w(V)/w(Sc),w(V)/w(Cr),w(Ni)/w(Co),w(V)/w(Ni+V),and w(Cu)/w(Zn)all suggest formation of the U-Mo-Ni-V-PGE-bearing rock series in an anoxic and restricted reducing environment.Enrichment of hydrothermal indicator elements(Ba,Sb,and As)combined with w(U)/w(Th),δEu,δCe,and w(Zn)-w(Ni)-w(Co)ternary diagrams demonstrate that U-Mo-Ni-V-PGE mineralization relates to hydrothermal sedimentation.Metallogenic materials exhibit multiple and deep sources,with uranium partially derived from uranium-rich stratum rocks and partially from deep-source uranium-molybdenum-nickel-vanadium-bearing hydrothermal fluids.Comprehensive analysis suggests U-Mo-Ni-PGE type mineralization is predominantly formed through exhalative sedimentation,U-V type mineralization mainly through syngenetic sedimentation and enrichment+leaching reformation,while U-P type mineralization is primarily through syngenetic sedimentation+thermal reformation.