【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²⁰⁸Pb/²⁰⁴Pb、²⁰⁷Pb/²⁰⁴Pb和²⁰⁸Pb/²⁰⁴Pb值,分别介于39.016⁴0.010、15.669¹5.826和18.694¹9.289。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。更多还原

【Abstract】 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.更多还原