贵州水银洞金矿构造蚀变体稀土元素地球化学特征.pdf

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1、矿物岩石地球化学通报·研究成果·BulletinofMineralogy，PetrologyandGeochemistryVo1．31No．4，July2012贵州水银洞金矿构造蚀变体稀土元素地球化学特征杨成富，刘建中，陈睿，王泽鹏。，闫宝文。，夏勇。，莫荣思1．贵州大学资源与环境工程学院，贵阳550003；2．贵州省地质矿产勘查开发局105地质大队，贵阳550018；3．中国科学院地球化学研究所，贵阳550002摘要：水银洞金矿构造蚀变体(SBT)为产出于茅口租(Pm)和龙潭组(P。z)之间不整合面上的一套强硅化灰岩、灰岩角砾岩、硅化粘土岩组合。采用ICP—MS测定钻孔岩芯中构造蚀变体样

2、品稀土元素组成，对比研究SBT围岩、区域岩浆岩及现代海底热水系统流体稀土元素组成。结果显示，SBT的轻重稀土分馏明显[LREE／HREE一4．92～17．51，(La／Yb)5．94～38．37]，曲线右倾型；轻稀土分异明显，曲线右倾程度大；重稀土分异不明显，曲线平坦；负Eu(0．61～0．94)、Ce(0．52～1．07)异常明显；SBT及围岩均具有明显w型稀土元素四分组效应，而不同于区域岩浆岩和现代海底热水系统流体，表明热液流体来源以壳源为主。关键词：构造蚀变体；稀土元素；四分组效应；水银洞金矿中图分类号：P595．73文献标识码：A文章编号：1007—2802(2012)04—040

3、4一lOGeochemicalCharacteristicsofREEsinStructureAIterationRocksoftheShuiyingdongGoldDeposit，GuizhouProvinceYANGCheng—fu，LIUJian—zhong，CHENRui，WANGZe—peng。，YANBao—wen。，XIAYong。，MORong—si1．Collegeofresourcesandenvironmentalengineering，GuizhouUniversity，Guiyang550002，China}2．GeologicaIParty105，Guizhou

4、BureauofGeologyandMineralExploration&Development，Guiyang550018，China；3．InstituteofGeochemistry，ChineseAcademyofSciences，Guiyang550002，ChinaAbstract：Thestructuralalterationrocks(namedasSBT)，composedbyheavilysilicifiedlimestones，silicifiedlime—stonebrecciasandsilicifiedmudstonesarealteredfromthosero

5、cksoverlyingtheunconformitybetweenPermianMaokouFormationandLongtanFormationsintheShuiyingdonggolddeposit，southwestGuizhouProvince，China．REEsconcentrationsinSBTsamplesfromdrillcoreswereanalyzedbyInductivelyCoupledPlasmaMassSpectrom—etrv(ICP—MS)．TheresultshowedthatREEsinSBTsamplesarecharacterizedbye

6、nrichmentofLREEs．LREE／HREE一4．92～17．51，(La／Yb)一5．94～38．37，notableLREEfractionationwithright—inclinedREEsdistribu—tionpatterns。negativeEuanomaly(3Eu0．61～0．94)andCeanomalyCe(ace0．52～1．07)．Thesecharacteristicsareverysimilartothoseoftheirhostrocks(tetradeffectofREEfoundinbothSBTandhostrocks)，andarequit

7、edistinctfromthoseofigneousrocksneartheShuiyindonggolddepositandmodernseafloorhydrothermalfluids．Asaresult，itissuggestedthathydrothermalfluidsintheShuiyindonggolddepositmaymainlyderivefromthecrust．Keywords：struct