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时间:2020-03-26
《贵州水银洞金矿构造蚀变体稀土元素地球化学特征.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
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
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