贵州黑色岩系金-铂族元素地球化学特征及成因分析  

Au-PGE geochemical characteristics and genetic analysis of the mineralization in black rock series in Guizhou province

作　　者：鲜绍军 罗俊峰 张庆华 刘玲 蒲庆隆 XIAN Shaojun;LUO Junfeng;ZHANG Qinghua;LIU Ling;PU Qinglong(Geological and Mineral Resource Exploration Institute of Guizhou Non-ferrous Metal and Nucleus Industry Geological Bureau,Guiyang 550005,China;Non-ferrous Metals and Nucleus Industry Geological Exploration Bureau of Guizhou province,Guiyang 550005,China)

机构地区：[1]贵州省有色金属和核工业地质勘查局地质矿产勘查院,贵阳550005 [2]贵州省有色金属和核工业地质勘查局,贵阳550005

出　　处：《地质找矿论丛》2023年第1期21-28,共8页Contributions to Geology and Mineral Resources Research

基　　金：贵州省公益地勘基金项目(编号:黔国土资综合函[2017]257号)资助。

摘　　要：为探讨贵州下寒武统黑色岩系中铂族元素物质来源及钼-镍、钒多金属形成的沉积环境与成矿作用,在钼-镍、钒多金属层及其顶底页岩、底部硅质岩中采集样品测试分析。通过对样品中金、铂族元素含量(质量分数)及其地球化学特征值研究,结果表明:黑色岩系中金及铂族元素含量显示协同变化特征;Pd富集,Ru、Ir亏损明显,Pt、Rh、Os基本持平或略有变化;样品的原始地幔标准值标准化模式配分曲线从Os、Ru、Rh、Ir、Pt到Pd大致呈“W”型,配分曲线略呈左倾,总体上呈现w(Pd)>w(Pt)>w(Os)>w(Rh)>w(Ru)>w(Ir)的变化关系;黑色岩系铂族元素来源与正常海水及海底热水喷流作用关系密切,地外来源可能性极小;黑色岩系钼-镍、钒多金属层中铂族元素的富集存在单独成矿作用或成矿作用的叠加,而且在钒多金属层内局部存在分层或条带分异。Samples are collected from Mo-Ni,V polymetal-bearing bed,siliceous rock at bottom of the bed and shale of its upper and lower wall to explore source of PGE,the depositional environment and metallogenesis of the Lower Cambrian black rock series in Guizhou province.Analysis of Au and PGE and their geochemical characteristics show that Au abundance is changed harmoniously with those of PGE.Pd is enriched,Ru,Ir depleted obviously,Pt,Rh and Os kept the same or changed slightly.The primitive mantle-normalized pattern of the sample shows distribution curve in form of W(from Os-Ru-Rh-Ir-Pt to Pd)declining to left with an general tendency w(Pd)>w(Pt)>w(Os)>w(Rh)>w(Ru)>w(Ir).PGE of the black rock series are derived from the normal sea water and erupted submarine hot water flow,rarely possible from space.In the Mo-Ni,V polymetallic bed occur single PGE mineralization and overprinted mineralization and in the V polymetallic bed occur stratified PGE concentration and zoned concentration.

关 键 词：下寒武统 黑色岩系 铂族元素 地球化学特征 贵州 

分 类 号：P595[天文地球—地球化学]