简介：1IntroductionDengfuxianorefieldliesattheintersectionoftheQin-HangCombinedZone(QCZ)andtheNanlingMetallogenic,andcomprisesXiangdongW-Sndeposit(AlsoknownasDengfuxianW-Sndeposit),Jiguanshi

简介：ThePengshanSn-Pb-ZnpolymetallicorefieldislocatedintheJiujiang-Ruichangregion,whichisasegmentofthemiddle-lowerYangtzeRivermetallogenicbelt.ThePengshanlateYanshanianburiedplutonwithgraniticcompositionisacalc-alkalinepluton,intrusionofwhichisresponsiblefortheformationoftheSn-Pb-Znpolymetallicdepositthroughprovidingthermodynamicconditionandore-formingmaterial.Thelong-activebasementriftsinitiallyformedintheJinningperiodandthedomalstructurewithinducedsecondaryorderfaultsformedbyemplacementofthepluton,suchasring-detachmentfault,top-detachmentfaultandjointfissure,actasthepassage-wayformagmaandore-formingfluidandimpoundingstructurefororedeposit.ThemagmatoformtheplutonwithDI＞90isintensivelydifferentiated.Thevariationoftheore-formingfluidincompositionwithfallingintemperaturecausedbyactionofmagmatichydrothermalconvectionsystemcombinedwithgroundwaterconvectionsystemattributestomineralizationofvarioustypesintheorefield.Themineralizationprocesscanbedividedintosixstages,i.e.,greisenization,skarnizationofearlystage,fluorite-stanniferoussilicationstage,skarnizationofadvancedstage,quartzandcassiterite-sulfurationstageandcarbonationstage.Themineralassemblagesformedindifferentmineralizationstagesaredifferentowingtotemperaturechangingandmaybeoverlappedinspace.Malayaiteisrecognizedfromthemineralassemblageformedinthefluorite-stanniferoussilicationstage.TheoresinthePengshanSn-Pb-ZnpolymetallicdepositarespatiallyzonedwithvariationfromAs-SnmineralassemblageofhightemperatureintheinnerzonethroughSn-PbandPb-Zn-Agmineralassemblageofmiddletemperatureinthemiddlezonetofluoritemineralassemblageoflowtemperatureintheouterzone.TheexchangingofSn,MgandFebetweenbiotiteandhydrothermalfluidresultedfromvariationofphysicochemicalconditionduringevolutionprocessesofthehydrothermalflu

简介：Rareearthandtraceelementsaredeterminedforcassiteritefromavein—typeorebody,alensandasheeted-typeorebodyintheDachangSn-polymetallicorefield,GuangxiProvince.Cassiteritefromthevein-typeorebodyhasrareearthandtraceelementcharacteristicssimilartothatofDachangbiotitegraniteofLateYanshanage,showinganinheritableandageneticrelationship.Cassiteritesfromthelensandsheeted-veinorebodyhaverareearthandtraceelementcharacteristicsgreatlydifferentfromthoseofthevein-typecassiteriteandthegranite,showingdistinctlyhighercontentsoftheore-formingelementsAs,Sb.Zn.Agetc.andapositiveEuanomalyandanegativeCeanomaly.Thedifferenceofrareearthandtraceelementcharacteristicsforcassiteritefromtwokindsoforebodiesreflectsthecompositionaldifferenceofore-formingsolutions.Authorssuggestthatthelensandsheeted—veinorebodywasofnonmagmatic,mixedwithundergroundhotbrineorigin,andthatthiskindofhotbrinereactedwithDevonian

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