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1、礦物巖石地球化學(xué)通報(bào)·研究成果·BulletinofMineralogy，PetrologyandGeochemistryVo1．31No．4，July2012貴州水銀洞金礦構(gòu)造蝕變體稀土元素地球化學(xué)特征楊成富，劉建中，陳睿，王澤鵬。，閆寶文。，夏勇。，莫榮思1．貴州大學(xué)資源與環(huán)境工程學(xué)院，貴陽(yáng)550003；2．貴州省地質(zhì)礦產(chǎn)勘查開發(fā)局105地質(zhì)大隊(duì)，貴陽(yáng)550018；3．中國(guó)科學(xué)院地球化學(xué)研究所，貴陽(yáng)550002摘要：水銀洞金礦構(gòu)造蝕變體(SBT)為產(chǎn)出于茅口租(Pm)和龍?zhí)督M(P。z)之間不整合面上的一套強(qiáng)硅化灰?guī)r、灰?guī)r角礫巖、硅化粘土巖組合。采用ICP—MS測(cè)定鉆孔巖芯中構(gòu)造蝕變體樣
2、品稀土元素組成，對(duì)比研究SBT圍巖、區(qū)域巖漿巖及現(xiàn)代海底熱水系統(tǒng)流體稀土元素組成。結(jié)果顯示，SBT的輕重稀土分餾明顯[LREE／HREE一4．92～17．51，(La／Yb)5．94～38．37]，曲線右傾型；輕稀土分異明顯，曲線右傾程度大；重稀土分異不明顯，曲線平坦；負(fù)Eu(0．61～0．94)、Ce(0．52～1．07)異常明顯；SBT及圍巖均具有明顯w型稀土元素四分組效應(yīng)，而不同于區(qū)域巖漿巖和現(xiàn)代海底熱水系統(tǒng)流體，表明熱液流體來(lái)源以殼源為主。關(guān)鍵詞：構(gòu)造蝕變體；稀土元素；四分組效應(yīng)；水銀洞金礦中圖分類號(hào)：P595．73文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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
