普朗铜矿英文介绍

普朗铜矿英文介绍0361-0128/11/3936/79-1479IntroductionThePulangporphyrycopperdepositislocatedontheTibetanPlateauinShangri-Lacounty,Yunnanprovince,southwesternChina,at99°59'23"Eand28°02'19"N(Fig.1)andataneleva-tionof3,520to4,570mabovesealevel.Thetopographyoftheareaishigherintheeast,lowerinthewest,andlocallysteep.ThePulangporphyrycopperdepositwasdiscoveredduringexplorationcarriedoutbyajointventurebetweenBillitonPlc.andtheYunnanBureauofExplorationandDevelopmentofGeologyandMineralResourcesafterinitialdefinitionofamineralizedtargetbytheBureau.In1999,theBureauandBillitonsetupGaoshanMiningCompanytocarryoutexplo-rationinthePulangarea.Basedona1:200,000-scalestreamsedimentgeochemicalsurvey,thecompanycompleteda1:100,000-scaleaeromagneticsurveyandsurfacegeologicmapping,findingCumineralizationoutcropsandhydrother-mallyalteredporphyryatthesiteofanaeromagneticanom-aly.Threeinitialdiamonddrillholeswerecompleted.HolePLD001wasmineralizedthroughoutandcontainedmorethan1percentCufrom0to103mdepth.HolesPLD002andPLD003yieldednosignificantmineralizationandinearly2001,Billitonterminatedthejointventure.In2002,theYun-nanGeologicalSurvey,supportedbytheChinaGeologicalSurvey,usedaspecialgovernmentfundtobeginsystematicexplorationofthearea.Bytheendof2005,theYunnanGeo-logicalSurveyhadcompleted25,000mofdrilling,400mofengineeringpits,and1,200m3oftrenching,aswellasgroundmagneticsurveysandremotesensingwork.ThedefinedandinferredCuresourcesinthewholeofthePulangarea,basedonrecentpreliminaryexploration,aremorethan10Mtcoppermetal.ThisincludesdefinedCuresourcesof4.18MtfromPulang,andinferredresourcesofover6Mtfromperipheraldeposits(includingHongshan,1.0Mt;Xue-jiping,1.2Mt;Lannitang,1Mt;Chundu,0.8Mt;andOsaila,0.5Mt,withintheWestporphyrybelt;andQiansui,0.5Mt;Langdu,0.5Mt;andYaza,0.2Mt,withintheEastporphyrybelt;seeFig.1b).TheinitialminingblockfororebodyKT1atPulangcontainsprovenreservesof1.57MtCu,withanaver-agegradeof0.52percent,alongwith54tofAuatagradeof0.18g/t,and84,800tofMoatagradeof0.01percent.PulangisoneofthemostimportantporphyrycopperdepositsfoundinChinainrecentyears;itsreservesrankthirdinChinaafterDexinginJiangxiandYulonginTibet.ThePulangporphyrycopperzoneextendsnorthwardintoSichuanprovince.InthePulangarea,whichcoversabout1,000km2,dozensofintermediateacidporphyrydepositsareexposed,including15mineralizedintrusions(Fig.1c).Atotalof129holesofal-together~25,000mhavebeencompleted.Thebiggestore-body,KT1ofthePulangdeposit,ismorethan1,600mlongby120to600mwide,hasaverticalextentof17to700mfromdrillintersections,andisopeninalldirections.ThePu-langporphyrycopperdepositisconsideredtohaveformedat213±3.8Ma(seebelow),andisatypicalexampleoftheIn-dosinianporphyrycopperdepositsfoundinChinasincethediscoveryoftheHercynian-ageTuwu-Yandongporphyryde-positinXinjiangprovince,theYanshanian-ageDexingdepositinJiangxiprovince,andtheHimalayan-ageYulongporphyrycopperdepositsineasternTibet.ThispaperpresentsthegeologiccharacteristicsofthePu-langporphyrycopperdepositandreportsnewchronologydataandimportantgeochemicalcharacteristicsoftheassoci-atedintrusions.SCIENTIFICCOMMUNICATIONSTHEPULANGPORPHYRYCOPPERDEPOSITANDASSOCIATEDFELSICINTRUSIONSINYUNNANPROVINCE,SOUTHWESTCHINALIWENCHANG,1ZENGPUSHENG,2HOUZENGQIAN,3ANDNOELC.WHITE4,†1ChinaUniversityofGeosciences,Beijing,China100083,andYunnanGeologicalSurvey,Kunming,Yunnan,China6500512AcademyofMineralResources,ChinaMetallurgicalGeologyBureau,Beijing,China1000253InstituteofGeology,ChineseAcademyofGeologicalSciences,Beijing,China1000374CODES,UniversityofTasmania,Hobart,Australia7000AbstractThePulangporphyrycopperdepositrecentlydiscoveredinnorthwesternYunnanprovince,China,islocatedatthesouthendoftheTriassicYidunislandarc.Todate,15mineralizedporphyrydepositshavebeendefinedinthePulangareaandthecopperresourceisestimatedtoexceed10Mt.ThePulangdeposit,ascurrentlyde-fined,ismadeupoffiveore-bearingporphyrydeposits,coveringanareaofapproximately9km2.Intermedi-ateacidicporphyriticintrusionscomposedofquartz-diorite,monzodiorite,quartz-monzonite,andgranodior-itearewidespreadinthePulangarea.Thealterationzonesidentifiedwiththeporphyrydepositsincludesilicic,potassiumsilicate,quartz-sericite,andpropyliticzones.Theporphyrydepositshavehornfelsatthecontactwithslate,sandstone,andandesite.Re-Osagesofmolybdenite,andAr/ArandK-ArdatingofbiotiteindicatethatthePulangporphyrycopperdepositformedduringtheIndosiniantectonicepisode,withthemainoreforma-tiontakingplacefrom216to213Ma(LateTriassic,Norian);however,thewholeprocessofhydrothermalac-tivity,includingoverprinting,mayhaveextendedfrom235to182.5Ma.†Correspondingauthor:e-mail,noelcwhite@hotmail.com©2011SocietyofEconomicGeologists,Inc.EconomicGeology,v.106,pp.79–92Submitted:August19,2011Accepted:September3,2011c70Shuduδµ15n15δµ16δµ16CuPbZnηοπ15CuCuFeYazaδµ15LazuoLuojiT3lmT3hT3qT3tT3lmTlmSichuanηγπ35W,MoSbW,MoShadugeleηγ35CuPbZnZhuomaTPbZnAgPbZnAgδοµδοµ15δοµ15δοµ15δοµ15ηοπηοπ15δοµ1515δοµ15AuCuδοµ15δοµ88855050δοµ1548AuCuPbZnCuPbZnAuCuCuPbZn4558Ousailaδοµ15δοµ15δµ15δοµ15δµ1515δοµ15δµδµ1515δοµ15λπ15λπ52540T3qT2bTnT1qPT1qT1qT2b ppt 关于艾滋病ppt课件精益管理ppt下载地图下载ppt可编辑假如ppt教学课件下载triz基础知识ppt T3h70CuCuXuejipingCuCuCuChunduA'rePulangLangduCuT99°45'100°00'27°41'27°41'28°32'99°45'CuηοπTnTnCuCuCuT3tηοπ15δµ15T1+2xT1+2xT1+2xClasticrocksandmuddySiltstone,slateandsandstoneAndesite,daciteintercalatedwithηοπ15λπ1515δοµηγ15YanshanianmonzograniteporphyryIndosinianquartzporphyryIndosinianquartzmonzoniteporphyryIndosinianquartzdioriteporphyryIndosiniandioriteporphyryXiuwacuXiaoxueshanDisugaQiansuiLannitangLanzhongYangtzeCratonZhMF.GezaF.GezaZhongdian(Shangri-la)a623417IndosinianislandarcbeltHimalayanporphyrybeltMesozoicbasinChengduLongmenshanthrustbeltIndianContinentSmaobasnAilaoshanshearzoneRedRiverfaultLanpingBeiyaFig.1bLijiangYidunSouthChina(Yangtze)Ganze-LitangSutureXiangchengMangkangBatangGongjueGangzeZhongdianBeijingbE.PohyrybeltW.Porδµ15δοµ15Relin.1.(a)RegionalsettingofZhongdianisland-arczone,showingtheIndosinianandHimalayanporphyrybeltsandde-positsnumberedasfollows:1=YulongCu,2=MalasongsuoCu,3=DuoxiasongsuoCu,4=MamupuCu,5=PulangCu,6=MachangqingCu-Mo-Au,7=TongchangCu.(b)RegionalgeologyoftheYidun-Zhongdianisland-arcbeltbetweentheGanze-LitangsuturezoneandtheZhongzaMassif.ThenorthsegmentofthearcisextensionalandcontainsKuroko-typemas-sivesulfidedepositssuchasGacun.Thesouthsegmentofthearciscompressiveandcontainsporphyrycopperdepositsasshown.(c)GeologyoftheZhongdianisland-arczone;thePulangporphyrycopperdepositisshowninsidethecentralbox.subduction-related,arcvolcanicrocksalongtheYidunzoneis238to210Ma(Panetal.,2003).TheeasternporphyryzonealongtheZhongdianzonehasagesof218to213Ma(Zengetal.,1999,2003),similartothoseofthenorthernisland-arczone.TheWestporphyrybeltwasproducedintheEarlyTri-assic(249Ma;Zengetal.,2003).Althoughtheisland-arczone,intersectedbytheXiangcheng-GezasuturearoundZhongdian(Fig.1b,c),isincompletelypreservedtothesouth(owinginparttolateorogeniccompressionandstrikeslip),theoccurrenceofbimodalTriassicvolcanicrocksaroundJiuheandEryuannearthesouthernJinshajiang-HonghefaultsuggeststhattheYidunisland-arczoneoriginallyextendedfurthersouthward(Liuetal.,1999;Zengetal.,2000;Sha,2002).TheIndosinianYidunisland-arcvolcaniczone(tothewestoftheGarze-Litangophioliticmélangezone)andtheHi-malayanalkali-richintrusionzone(alongtheJinshajiang-Honghefault)constitutetwoimportantporphyrysystemsinwesternYunnan(Fig.1a).PorphyrydepositssuchasPulang,Xuejiping,andothersarelocatedintheIndosinianporphyryzone(Fig.1b).PorphyryCu-Audeposits,suchasYulong,Machanqing,Habo,andTongchang,arelocatedintheHi-malayanalkali-richporphyryzone(Fig.1a).GeologicsettingoftheIndosinianZhongdianisland-arczoneTheZhongdianisland-arczoneisthesouthernpartoftheYidunislandarc(Fig.1b),westoftheGarze-Litangsuturezone,whichnearlyturnseast-westaroundLuojiandZhong-dian.Westwardsubductionisindicatedbyacontinuousglau-cophaneschistbelt(Sha,1988)andophioliticsuitealongthesuturezone(Zengetal.,2004).Hugevolumesofintermedi-ateacidvolcanicrocksandseveralKuroko-typemassivesul-fidedeposits(e.g.,Gacun:Houetal.,1996)arefoundinthenorthernYidun(Changtai)extensionalislandarc.Numerousintermediate-acidporphyrydepositsandporphyrycopperde-positsdevelopedinthesouthernYidun(Zhongdian)com-pressionalislandarc.Thenearnorth-southGezafault,alongthewesternsideoftheZhongdianislandarc,extendssouth-wardandjoinstheGarze-Litangsuturezone(Fig.1b).De-tailedfieldobservationsindicatepartsoftheShuduophiolitemélangebeltarelocatedwithintheZhongdianisland-arczone,suggestingthatitisaremnantofEarlyTriassic,intra-arc,ocean-floorsubduction.Thus,threedifferentbelts(Eastporphyrybelt,Shuduophiolitemélangebelt,andWestpor-phyrybelt)constitutedifferenttectonic,magmatic,andmin-eralizationzoneswithintheZhongdianisland-arczone(Fig.1b).ThemiddleparttheShuduophioliticmélangebeltisin-completebetweentheEastandWestporphyrybelts.SomeultramaficrocksandmaficaccumulatesarediscontinuouslyexposedaroundHongshan-XiaoxueshanPass.Theultra-maficrocks,preservedinanarea200mlongby3to15mwide,areintenselyserpentinizedandarecomparablewiththeultramaficrocksintheLuoji-WachangsegmentofthesouthernGarze-Litangsuture(Sha,1988).Basaltandthinlybeddedchertsarelocatedneartheultramaficrocks.Accu-mulates(serpentinizedanorthosites)arealsofoundatLazuo(Fig.1b).Togetherwithwidespread,thinlybeddedchertsandlimestones,theseultramaficandmaficrocksconstituteanincomplete,north-south–trendingophiolitemélangezone,whichisnamedtheShuduophiolitezone(Fig.1c;Zengetal.,2004).PulangPorphyryDepositsPorphyrybeltsoftheZhongdianislandarcTheWestporphyrybeltislocatedwestoftheShuduophi-olitemélangezoneandeastoftheXiangcheng-Gezafault(Fig.1c).ThemainvolcanicsequenceoftheWestporphyrybeltisdominatedbyandesiticvolcaniclasticrocksandlavas,aswellascoevalhypabyssalintrusions(diorite,quartzdiorite,etc.)thatwereformedintheEarlyTriassic(249Ma;Zengetal.,2003,2004).TheywereclearlyformedearlierandaremoreintenselyfoliatedthanrocksoftheEastPorphyrybelt.TheEastporphyrybeltislocatedeastoftheHeishuitangfaultandtheShuduophiolitemélangebelt(Fig.1c).Thethick,massivelavasintheQiansui-PulangareaoftheEastporphyrybeltarelocatedalongtheHeishuitangfault.Ingen-eral,thevolcanicrocksintheEastporphyrybeltaredomi-nantlyandesitic,withcleavagemuchlessdevelopedthanintheWestporphyrybelt.ThehypabyssalquartzmonzoniteporphyryaroundHongshanhasanageof214Ma,datedbyRb/Srisochronsonwhole-rocksamples(Tanetal.,1985).Bi-otiteseparatesfromtheLangduquartzmonzoniteporphyryyielda40Ar/39Arisochronageof216.93±4.34Ma(Zengetal.,2000,2003).Basedonthesedataandfieldobservations,theEastporphyrybeltisconsideredtobeanislandarcpro-ducedbyLateTriassic(Norian)westwardsubductionoftheGarze-Litangoceanicfloor.ThePulangintrusionislocatedatthesouthendoftheEastporphyrybelt.CharacteristicsofmineralizedporphyrydepositsInthePulangporphyrycopperdistrict,fivemineralizedporphyrydepositswereemplacedintothecoreofthePulangdome;theporphyrydepositsareofdifferentsize(Table1).CountryrocksaredominatedbyclasticrocksandandesiteoftheLateTriassicTumugouFormation(T3t).OneofthePu-langporphyrydeposits,aquartzmonzoniteporphyrydeposit,cropsoutinanareaofabout1km2.Theporphyrydepositsarepetrographicallydominatedbyquartzdiorite,quartzmonzonite,granodiorite,andminormonzodiorite,whicharebrieflydescribedbelow.Quartzdiorite:Gray,porphyritictexture;phenocrystsofpla-gioclase(22%)andhornblende(<5%);matrixofplagioclase(65%),quartz(7%),hornblende(1%),andK-feldspar(minor)withfinetomicrogranulartextureandmassivestructure;ac-cessoryzirconandapatite;alterationdominatedbyquartz,sericite,andpropyliticalterationwithlocaluralitization.Quartzmonzonite:Gray,porphyritic,microgranular,andmassive;withphenocrystsofplagioclase(15%),K-feldspar(13%),biotite(2%),andquartz(minor);matrixofoligoclase(25%),K-feldspar(28%),quartz(15%),biotite(2%),acces-sorymagnetite,zircon,andapatite;alterationdominatedbyquartz-sericiteandK-feldspar–quartz,withlocalchloriteandhydrothermalbiotite.Granodiorite:Gray,porphyritic,microgranularcrystal-loblastic,andmassive;phenocrystsofplagioclase(oligoclase-andesine20%),K-feldspar(5%),biotite(5%),quartz(3%),andhornblende(10%);matrixofplagioclase+quartz(39%),hornblende(15%),biotite(5%),aswellasaccessorymag-netite,zircon,andapatite;alterationdominatedbysericite-quartzandK-feldspar–quartz,withlocalchloriteandhy-drothermalbiotite.Theorebodiesaremainlylocatedwithinthephyllicandpotassiumsilicatealterationzones,occupyingthequartzmonzoniteporphyryemplacedinquartz-dioriteporphyry(Fig.2).Mineralizationincludesthefollowingthreestyles:1.Veinlet-disseminatedmineralization:CumineralizationismostintenseintheK-silicate(biotiteandK-feldspar)zone.Chalcopyritereplaceshornblendeandearlybiotiteascircularpatchesorisdistributedasveinletsanddisseminationsasso-ciatedwithquartzinyellowish-pink,K-feldspar-biotite,quartz-monzoniteporphyry.Cugradeisgenerally>1percentinthisstyle.Cumineralizationbecomesweakeroutwardandchalcopyriteisfoundinquartz-sericite–alteredquartzmon-zoniteporphyryasveinletsanddisseminations.2.Cryptoexplosive,breccia-relatedmineralization:severaldikeswithbrecciatextureandeast-westorientationarelo-catedonthewesternmarginofthequartz-dioriteporphyry,constitutingfiveorebrecciaveins(KT4-KT6)withvaryinglengthsthatcutearly,quartz-monzoniteporphyry(Fig.2b).ThistypeoforehasahighCugradeof1to10percentandisfoundinthetopofthemineralizedintrusion,abovethevein-let-disseminatedzone.ThepresenceofthisstylesuggeststhattheerosiondepthinPulangcopperisnotdeepandthattheCuorebodiesarewellpreserved.3.VeinedPb-Znmineralization:Somegalena-sphalerite-quartzveinsfilltensionalfracturesnorthoftheminearea(Fig.2a).Sixorebodieshavebeendelineatedintheinitialminingarea.Themainorebody,KT1,islocatedinthecentralpartofthePulangporphyrydeposits.Itcropsoutbetweenprospect-ingline0and4,withanelevationof3,870to4,030m.Con-cealedportionsextendbeneathlines32to20.Theorebodyhasalengthof1,600m,iscontrolledby129drillholes,andremainsunconstrainedtothenorth.Itswidthinthesouthis360to600mand120to300minthenorth.Thethicknessoftheorezonevariesfrom52to370m,withamaximumthick-nessof700m(Fig.2c).Theintersectionoftheorezoneindrillholesvariesfrom17to700m.ItsCugradevariesfrom0.20to3.74percent,averaging0.52percentwithavariationcoefficientof68.69percent.ThecentralpartoftheorebodyisverythickandhashighCugrade;gradesdecreasegraduallyoutward,associatedwith0.06to0.87g/tAu(avg0.18g/t),0.34to3.93g/tAg(avg1.27g/t),0.001to0.030percentMo(avg0.010%),0.94to1.90ppbPt(avg1.34ppb),and2.20to14.00ppbPd(avg4.95ppb).ExplorationintheinitialminingareaoforebodyKT1definedorereservesof1,229Mt,containingmetalreservesof4.18MtCu,withanaveragegradeof0.34percent.Ofthis,theprovedandmeasuredCumetalreservesare2.89Mt,withanaveragegradeof0.52percent.AssociatedpreciousmetalsincludeAureservesof54t,averaging0.18g/t;1,490tAg,averaging1.22g/t;and84,800tMo,averaging0.01percent.Fourdeepdrillholes,eachover700mdeep,werecompletedonorebodyKT1in2005;theyindicatedpotentialCuresourcesofover5Mt,withaveragegradeof0.57percent.Therearenore-sourcecalculationsyetforotherorebodies.Theoresaredominatedbysulfides,withlocaloxidizedoreandmixedores.Theoxidizedzoneisgenerally10to40mdeep.Thoughmalachiteisrarelyseenintheoxidizedzone,tenoritefoundonjointplanesofoxidizedoresrelatestohighaltitudeandrelativelylowCO2atthesurfaceinthisarea.Thisisoneofthemainprospectingindicatorsforporphyrycoppermineralizationinwetareasathighaltitude.Metallicmineralsinthesulfideorezonearedominatedbychalcopyrite,bor-nite,pyrite,pyrrhotite,magnetite,andmolybdenite.HydrothermalalterationDuringexploration,itwasdifficulttomapacidporphyrywithinthelarge,intermediateporphyrydepositsandtorec-ognizealterationzones.Thisproblemwassolvedbyinte-grateduseofaporphyrymodel,hyperspectra,PIMA,andhigh-precisionmagneticsurveys.Mappingofmagmaticrockshasbeencompletedusinghyperspectralsatelliteim-agesandPIMA;intrusionboundariesweredeterminedwithreferencetotheresultsofmagneticsurveys.Theal-terationzoneshavebeendelineatedbymicroscopicidenti-ficationandPIMAmeasurementsof635specimenssam-pledfrom129drillholesintheminedistrict.Inthisway,15ore-bearingporphyrydepositsandcorrespondingalterationzoneswerequicklydefinedinthearea.Thetypicalalter-ationzoningandrelatedorebodies,delineatedbystudyofthinsectionsofthecorefromdrillholes,areshowninFig-ure2c.Theearly,hornblende-biotite-quartz-dioriteporphyrywascrosscutbylate,hornblende-biotite-quartz-monzonitepor-phyryandminorgraniteporphyry.Thelattertwoporphyrydepositsshowcompositionaldifferentiationandasmalldis-crepancyinage(seebelow).Theslightlylaterquartzmon-zoniteporphyrywasintensivelyCu-(Mo)mineralized.Theporphyrydepositssurroundedbyhornfelswerein-tenselyalteredtoaquartz–K-silicate(biotite,K-feldspar)zone,aquartz-sericitezone,analbitezone,clayalteration,andapropyliticalterationzone(chlorite,epidote).ZoningisshowninFigure2.Thegeneralcharacteristicsofthefivedominantalterationzonesaresummarizedbelow.1.Siliciczone(Si):Thiszonecorrespondstothecoreoftheporphyrybodyandischaracterizedbydenselydissemi-natedquartzorstockworksofquartzwithlessersulfides(mainlypyrite),roughlycorrespondingtothelow-grademin-eralizationzone(Fig.2c).2.Potassiumsilicatezone(KSi):Thiszoneismostlyassoci-atedwithMo-bearingCuorebodiesandenclosestheintensesiliciczone(Fig.2c).Thepotassiumsilicatezoneischarac-terizedbyalargeincreaseinthecontentsofK-feldspar,quartz,andminorbiotiteveinlets,withquartzandquartz-sul-fideveinlets.Hornblendeintheoriginalrockwasreplacedbyhydrothermalbiotiteassociatedwithapatiteandzircon.3.Quartz-sericiteorphylliczone(SiSe):Sericiteassoci-atedwithquartzprogressivelyreplacespotassiumsilicatemineralsinthiszone.PlagioclaseandK-feldsparintheorig-inalrockwerereplacedbysericiteandquartz,withthepor-phyritictexturepreserved.Magmaticquartzdisplayshy-drothermalovergrowths.Biotiteiscrosscutbymetalsulfideveinletsandstockwork.Molybdenite-bearingquartzveinletsaretypicallyfoundintheinitialminingblocknortheastofthe84SCIENTIFICCOMMUNICATIONS0361-0128/98/000/000-00$6.0084TriassicTumugouFm.Slate,sandstoneintercalatedwithandesiteQuartzdioriteporphyryQuartzdioriteporphyryveinorgranitedioriteporphyryHornfelszone270.80mSCIENTIFICCOMMUNICATIONS850361-0128/98/000/000-00$6.008586SCIENTIFICCOMMUNICATIONS0361-0128/98/000/000-00$6.0086SCIENTIFICCOMMUNICATIONS870361-0128/98/000/000-00$6.0087copperdepositcertainlyunderwentmultiplethermalevents—orunderwentmultiplesuperimposedthermalevents—dur-ingtheintervalof223.5to182.5Ma.TheAr/Ardatingofbiotiteseparatesfromore-bearingin-trusionswasusedtodeterminetheore-formingagesofCu-bearingbodieslackingmolybdeniteandtocomparewiththemolybdeniteageoforebodyKT1.Althoughtheagesarenotdirectlydatedfrommetallicminerals,insteadderivingfrombiotiteintheK-silicatealterationzones,theresultsstillrep-resenttheagesofore-forminghydrothermalactivity.There-sults(Fig.A1;TableA2)showthattheore-formingages(plateauagesTp)ofbothCu-Mo–bearingandCu-bearingporphyrydepositsarestatisticallyidentical(214.58±0.91–216.0±1Ma)andintheLateTriassic(Norian).Theisochronagesarealsoclose(Fig.A1).TheRecontentofmolybdeniteinporphyryCu-Mode-positsiscontrolledbythesourcemagmacomposition,depthofdepositformation,andoxygenfugacity(Bernardetal.,1990;McCandlessetal.,1993;Berzinaetal.,2003a).Typi-cally,thepresenceofclayintergrowthsorinclusionsinmolybdenitewillresultinReenrichmentandlowapparentages(ChesleyandRuiz,1997;Barraetal.,2003).Re-Osdat-ingfortheMo-bearingorebodyKT1aimedtostudywhethertheMoandCumineralizationformedatthesametimeandwhethertheformationofthistypeofmolybdeniteisrelatedtotheMomineralizationthattookplaceduringalateYan-shanianintracontinentalextensionstage.ThisisthesituationintheXiuwacuandRelinMominingdistricts,northofPu-lang.Re-Osdatingofmolybdenitefromanorebodyismorereliablethanothermethods(Duetal.,1995)andcancon-strainthedurationoftheore-formingprocess(Berzinaetal.,2003b).Therewerenoclayintergrowthsinthesamplesana-lyzedhere,whichproducedwell-constrained187Re-187OsageswithlowMSWDvalues.TheRecontentofthemolybdenitedatedhasawiderange(0.24–1,690ppm),norelationshipswiththedistributionofthedepositsortheirgeologicages,andnocommonOs.Anaccumulationofradiogenic187OsisaproductofmineralageandRecontent(YinandHuang,1994);therefore,theRecontentofmolybdeniteisoneofthefactorsinfluencingRe-Osdating.TheRecontentsofPulangCu-(Mo)depositsrangefrom239.8to379.3µg/g,average318.5µg/g,andbelongtohighRemolybd