云南勐海勐满金矿含金黄铁矿地球化学特征和矿床成因意义  

Geochemical characteristics and genetic significance of auriferous pyrite from Mengman gold deposit in Yunnan province

作　　者：蒋丽怡[1] 李卓飞 孙晓明[1,2,3] JIANG Liyi;LI Zhuofei;SUN Xiaoming(School of Earth Science and Engineering,Sun Yat-sen University,Guangzhou 510275,China;School of Marine Sciences,Sun Yat-sen University,Guang zhou 510006,China;Key Laboratory of Marine Resources and Coastal Engineering in Guangdong Province,Guangzhou 510006,China)

机构地区：[1]中山大学地球科学与地质工程学院,广州510275 [2]中山大学海洋学院,广州510006 [3]广东省海洋资源与近岸工程重点实验室,广州510006

出　　处：《地质找矿论丛》2018年第2期182-194,共13页Contributions to Geology and Mineral Resources Research

基　　金：国家自然科学基金(编号:U1302233;编号:41672071;编号:41602067);国家重点基础研究发展规划(973)项目(编号:2015CB452604);高等学校博士学科点专项科研基金(编号:200805580031)联合资助

摘　　要：黄铁矿是金矿重要的载金矿物之一,对其地球化学特征研究可以约束金矿成矿类型和成矿物质来源。本文对云南勐满金矿含金黄铁矿的化学成分及其S、Pb同位素特征进行了研究,结果显示:勐满金矿黄铁矿化学成分中的N(S)/N(Fe)值、δFe—δS及w(As)—w(Co)—w(Ni)图解等特征表明其原生矿床属于浅成低温热液型矿床。黄铁矿硫同位素为-4×10^(-3)^-2×10^(-3),数值集中;铅同位素组成^(208)Pb/^(204)Pb、^(207)Pb/^(204)Pb和^(208)Pb/^(204)Pb值,分别介于39.016~40.010、15.669~15.826和18.694~19.289。测试结果显示勐满金矿属于低硫型浅成低温热液型金矿,成矿物质主要来源于围岩地层。热液成矿阶段金主要赋存在黄铁矿中,在次生氧化阶段,金从黄铁矿中出溶并进一步富集,次生氧化阶段是形成富矿的重要阶段。Pyrite is one of the most important Au-carrier whose geochemical character can constrain metallogenic type and ore-forming material sources of gold deposits.In this paper chemical composition and SPb isotopes of auriferous pyrite in Mengman gold deposit have been analyzed.The N（S）/N（Fe）values,δe—δS and w（As）—w（Co）—w（Ni）diagram belongs to the shallow low-temperature hydrothermal deposit.S isotopic value -4×10-3～-2×10-3,Pb isotopic value 208 Pb/204 Pb,207 Pb/204 Pb,208 Pb/204 Pb at 39.016～40.010,15.669～15.826,18.694～19.289 respectively.The results show Mengman gold deposit belongs to low-sulfur-type epithermal gold deposit.The ore-forming materials mainly come from host rocks.In hydrothermal mineralization stage,gold is mainly hosted in pyrite.In the secondary stage gold exsoluted from auriferous pyrite and further enrichment of gold happen in the secondary oxidation stage,which is an important stage for the formation of high-grade gold deposit.

关 键 词：勐满金矿 含金黄铁矿 硫铅同位素 矿床成因 低硫型浅成低温热液型金矿 云南省 

分 类 号：P578.292[天文地球—矿物学] P618.51[天文地球—地质学]