成矿规律、成矿模式研究 资源勘查工程毕业论文

《成矿规律、成矿模式研究 资源勘查工程毕业论文》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、摘要夏家店金-钒矿床为产于黑色岩系中的典型矿床。金矿完全受层位、有利岩性及构造的控制。金矿体呈扁豆状、透镜状、似板状等。氧化矿中金呈独立矿物存在，主要以粒间金和裂隙金为主。围岩蚀变不发育，近矿围岩主要有硅化、黄铁矿化等。根据金矿成矿作用方式分为沉积预富集期、构造一热液改造期和表生氧化富集期三个矿化期。金矿化石英脉流体包裹体H、O同位素组成特征暗示成矿流体来源于受到强烈改造的大气降水。铂族元素、硅同位素特征表明成矿物质具有多种来源，主要来自地层。根据金矿成矿特征、确定金矿床为沉积一改造型热液矿床。钒矿体矿体形态简单，呈层状，严格受黑色

2、岩系层位控制，矿体沿走向、倾向品位、厚度较为稳定。钒矿石大致可划分为①泥质硅板岩型、②碳质粘土岩型和③硅质碳质粘土岩型三种类型，均为层状构造，类型③钒矿品位一般较高。通过X衍射等方法确定钒以钒云母、铁的氧化物、钛铁矿等形式存在。根据钒矿地质特征和成矿作用方式确定其为沉积成因。黑色岩系金-钒矿成矿规律:黑色岩系产于孤岛状古隆起边缘断陷沉积盆地内，沉积的陆源与内源物质充足。黑色岩系富集Au,V等多种成矿元素，既是矿源层、也是容矿层。碳质硅质板岩与碳质粘土板岩交互层+含磷结核层过渡型岩段反映海侵和海退动荡的沉积环境，有利于钒富集成矿以及金

3、预富集和后期改造成矿。An、V成矿作用方式不同。关键词:黑色岩系；金-钒矿；成矿特征；成矿规律AbstractXiajiadiangold-vanadiumdepositisatypicaldeposithosedintheblackrockseriesandcontrolledbythestrata,favorablelithologyandstructure.Thegoldorebodyislenticular,platy-like.Goldoccursasindependentmineralmainlyintheintergr

4、ainofquartzandfracture.Wall-rockalterationisweakandthemainalterationtypesingolddepositsaresilicificationandpyritization.Thewatermostlycomesfromstronglyreconstructedmeteoricwater,accordingtothehydrogenandoxygenisotopescompositionofinclusionofthemineralizedquartz.Ontheba

5、sisofanalysisPGEandSiisotopes,itisshownthatthedepositsprobablycomefrommanysources,butstratumisthemainsource.Metallogeneticcharacteristicsindicatetheoredepositisalterativehydrothermaldeposit.Thevanadiumorebodies,whichhavebeencontrolledbythestrataofblackrockseries,aresim

6、piylayered.Oregradeandthicknessarestablealongstrikeandtread.Thereare3typesofvanadiumore:①theargillaceoussilicicslate-type,②thecarbonaceousclayrock-typeand③thecarbonaceoussilicicclayrock-type,usuallythevanadium-richone,allofthethreetypespresentmainlyastructureoflayered.

7、Vanadiumoccurredasroscoelite,ironoxideandsefstromiteetc.SedimentarygenesisisdeterminedbythefeaturesandmineralizationwaysoftheVanadiumdeposit.Metallogeneticregularitiesofgold-vanadiummineralizationhostinblackrockseries:Theblackrockseriesoriginatefromthefaultbasinandonth

8、emarginofisolaltedpaleo-uplift,inwhichthereweresuffcientsedimentarysubstancesofterrestrialsourcesandendogenoussources