水口山铅锌矿

PrecisezirconU–PbandmolybdeniteRe–OsdatingoftheShuikoushangranodiorite-relatedPb–Znmineralization,southernHunan,SouthChina

Jin-ChuanHuanga,b,Jian-TangPenga,c,?,Jie-HuaYanga,Bang-LuZhanga,b,Chun-XiaXua,b

abc

StateKeyLaboratoryofOreDepositGeochemistry,InstituteofGeochemistry,ChineseAcademyofSciences,Guiyang550002,PRChinaUniversityofChineseAcademyofSciences,Beijing10049,PRChina

KeyLaboratoryofMetallogenicPredictionofNonferrousMetals,MinistryofEducation,SchoolofGeosciencesandInfo-physics,CentralSouthUniversity,Changsha410083,PRChina

articleinfoabstract

TheShuikoushanoredistrict,locatedinsouthernHunanProvince,SouthChina,containsPb–Zn–Aumineraliza-tionhostedintheDevoniantoTriassicstrataandMesozoicgranodioriteintrusions.Oremineralsaremainlypyrite,sphalerite,galenaandminormolybdenite.Molybdenite,usuallyintergrownwithpyrite,formedduringPb–Znhydrothermalmineralization.InordertodeterminethepreciseageofPb–Znmineralizationandfurtherunderstandtherelationshipbetweenmagmaemplacementandhydrothermalmineralizationintheoredistrict,molybdeniteRe–OsdatingandzirconSIMSU–Pbdatingwereundertaken.ThezirconU–Pbdatingrevealsthatthegranodioriteintrusionwasemplacedat158.8±1.8Ma(MSWD=0.40).Re–Osisotopicageofsevenmolybdenitesamplesyieldsmodelagesrangingfrom157.5±2.5Mato161.0±2.4Ma,andgivesawell-de?ned187Re–187Osisochronageof157.8±1.4Ma(2σ,MSWD=1.3),indicatingthetimingofPb–Znmineral-izationintheShuikoushanoredistrictatabout158Ma.ThisdatecoincideswellwiththezirconSIMSU–Pbageofthegranodiorite,revealingageneticassociationbetweenthePb–Znmineralizationandthegraniticmagmatism.CombinedwithgeochronologicaldatapublishedforotherPb–Zn–(Cu)depositsinsouthernHunan,itcanbeconcludedthatthegranodiorite-relatedPb–ZnmineralizationthroughoutsouthernHunanmainlyoccurredat160–156Ma,ratherthan180–170Maor170–160Maasconsideredpreviously.ThePb–ZnmineralizationandmajorW–SnmineralizationinsouthernHunanarecoevalandmayberelatedtothesamegeologicalevent.

?2015ElsevierB.V.Allrightsreserved.

Articlehistory:

Received2January2015

Receivedinrevisedform13June2015Accepted14June2015

Availableonline16June2015Keywords:

SIMSU–PbdatingRe–OsdatingMolybdenite

Pb–ZnmineralizationSouthernHunanSouthChina

1.Introduction

MesozoicgranitoidsarewidespreadintheNanlingRange,SouthChina,andaretemporallyandspatiallycloselyrelatedtoPb,Zn,WandSnmineralization.Generallyspeaking,Pb–Zndepositsareusuallyrelatedtosmallgranodioriteintrusions,whereasthoseW–Sndepositsareassociatedwithgraniteplutons(Huaetal.,2003;Maoetal.,2008;Xuetal.,1982,1983).Historically,theW–SnmineralizationandthePb–Znmineralizationrelatedtograniticintrusionsintheareawereconsideredtohaveformedduringtwodifferentmetallogenicsystems(Huaetal.,2003;Maoetal.,2008;Xuetal.,1982,1983).

ExtensiveresearchhasbeenperformedonW–SndepositsandrelatedgraniteplutonsintheNanlingRange(e.g.Hsu,1943;Liu,1980;Lu,1986;Maoetal.,1998;Moetal.,1958;RGNTD,1985;Wangetal.,1987;XuandDing,1938;Zhuetal.,1981).RecentstudieshaveconstrainedthetimingofW–Snmineralizationintheregionthroughprecisegeochronologicalanalyses(e.g.Caietal.,2006;Fengetal.,2011;Fuetal.,2007;Guoetal.,2011;Huetal.,2012;Liuetal.,2008a,2012;Maoetal.,2007;Pengetal.,2006,2007;Qietal.,2012;Wang

?Correspondingauthorat:StateKeyLaboratoryofOreDepositGeochemistry,InstituteofGeochemistry,ChineseAcademyofSciences,Guiyang550002,PRChina.

E-mailaddress:jtpeng@126.com(J.-T.

TheShuikoushanoredistricthostsPb–ZnmineralizationrelatedtothegranodioriteintrusionsoftheNanlingRange.Thedistrictcontainstotalmetalreservesof874,600tPband1,110,800tZn,withanaveragegradeof2.50–3.92%Pband2.57–4.40%Zn,respectively(Zhu,1999).AsanimportantPb-andZn-producerinChinaforthepastcentury,thegeologicalcharacteristics,oregenesisandgeochemicalcharacteristicsoftheShuikoushanoredistrictandrelatedintrusionshaveattractedmuchattention(e.g.LiandPeng,1996;Liu,1994;LiuandTan,1996;Luetal.,2013;Maetal.,2006;TanandWan,2008;YuandLiu,1997;Zengetal.,2000;Zhang,1957).However,duetolackofreliableages,

http://dx.doi.org/10.1016/j.oregeorev.2015.06.0110169-1368/?2015ElsevierB.V.Allrights

reserved.

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