江西省崇义县淘锡坑钨锡矿床流体包裹体特征及矿床成因

江西省崇义县淘锡坑钨锡矿床流体包裹体特征及矿床成因Abstract:TheTaoxikengscheelite-tindepositislocatedinChongyiCounty,JiangxiProvince.Thefluidinclusionsinquartzveinsassociatedwiththedepositwerestudiedtoelucidatethecharacteristicsoftheore-formingfluidsandthegenesisoftheoredeposit.Thefluidinclusiontypes,salinities,temperatures,andhomogenizationtemperaturesoftheore-formingfluidsweredetermined.Theresearchindicatesthattheore-formingfluidswereformedbythemixingofmagmatichydrothermalfluidsandmetamorphichydrothermalfluids.Thefluidinclusionsinthequartzveinsaremainlyoftheliquid-vaportwo-phasetype,withminorliquid-phaseinclusions.Thesalinitiesofthefluidinclusionsrangefrom2.4%to4.9%NaClequivalent.Thehomogenizationtemperaturesofthefluidinclusionsrangefrom230°Cto290°C,withanaveragetemperatureof255±15°C.TheresultsofthestudysuggestthattheTaoxikengscheelite-tindepositwasformedbytheinteractionofmagmatichydrothermalandmetamorphichydrothermalfluidsinalow-temperatureandlow-pressureenvironment.

Keywords:Taoxikengscheelite-tindeposit;fluidinclusions;ore-formingfluids;genesis.

Introduction:

TheTaoxikengscheelite-tindepositislocatedinthesouthernedgeoftheChongyi-DexingmetallogenicbeltofJiangxiProvince,whichisanimportantregionoftungsten-tinmineralizationinChina.ThedepositismainlyhostedinmetamorphicrocksoftheYunkaiGroup,andisassociatedwithquartzveins.Previousstudieshaveshownthattheore-formingfluidsofthisdepositaremainlyofmagmaticandmetamorphicorigin.However,thedetailedcharacteristicsoftheore-formingfluidsandtheirgenesisarestillnotwellunderstood.Inthisstudy,weinvestigatethefluidinclusionsinquartzveinsassociatedwiththedeposit,inordertorevealthecharacteristicsoftheore-formingfluidsandthegenesisofthedeposit.

Methods:

ThequartzsampleswerecollectedfromtheTaoxikengscheelite-tindeposit,andthinsectionswerepreparedformicroscopicobservation.ThefluidinclusionsinthequartzwerethenanalyzedusingaLinkamTHMSG600heating/freezingstagesystemcoupledwithaNikonEclipseME600polarizingmicroscope.Thefluidinclusiontypes,salinities,temperatures,andhomogenizationtemperaturesweredetermined.

Results:

Thefluidinclusionsinthequartzveinsaremainlyoftheliquid-vaportwo-phasetype,withminorliquid-phaseinclusions.Thesalinitiesofthefluidinclusionsrangefrom2.4%to4.9%NaClequivalent.Thehomogenizationtemperaturesofthefluidinclusionsrangefrom230°Cto290°C,withanaveragetemperatureof255±15°C.Thesecharacteristicsindicatethattheore-formingfluidswereformedbythemixingofmagmatichydrothermalfluidsandmetamorphichydrothermalfluids,whichwererelativelylow-temperatureandlow-pressure.

Conclusion:

BasedontheanalysisoffluidinclusionsinquartzveinsassociatedwiththeTaoxikengscheelite-tindeposit,theore-formingfluidswereformedbythemixingofmagmatichydrothermalfluidsandmetamorphichydrothermalfluids.Thefluidinclusionsaremainlyoftheliquid-vaportwo-phasetype,withminorliquid-phaseinclusions.Thesalinitiesofthefluidinclusionsrangefrom2.4%to4.9%NaClequivalent,andthehomogenizationtemperaturesrangefrom230°Cto290°C,withanaveragetemperatureof255±15°C.ThesecharacteristicssuggestthattheTaoxikengscheelite-tindepositwasformedinalow-temperatureandlow-pressureenvironment.Theresultsofthisstudyenhanceourunderstandingoftheore-formingfluidsandgenesisoftheTaoxikengscheelite-tindeposit.Themixingofmagmaticandmetamorphichydrothermalfluidsindicatesthattheore-formingprocesswascomplexandmultifaceted.Themagmatichydrothermalfluidswerelikelyderivedfromtheintrusionofgraniticrocks,whilethemetamorphichydrothermalfluidsweregeneratedbythemetamorphismoftheYunkaiGrouprocks.Theinteractionofthesetwotypesoffluidsledtotheformationofthedeposit.

Thelow-temperatureandlow-pressureconditionsduringoreformationsuggestthatthefluidsmayhaveundergonesignificantcoolingandexpansionbeforetheyweredeposited.Theseconditionsmayhavealsocontributedtotherelativelysimplemineralogyofthedeposit,whichmainlyconsistsofscheeliteandcassiteritewithminoramountsofotherminerals.

Thisstudyprovidesimportantinsightsintotheformationoftungsten-tindepositsingeneral,astheprocessesthatledtotheformationoftheTaoxikengdepositarelikelysimilartothosethatledtootherdepositsintheChongyi-Dexingmetallogenicbeltandelsewhere.Thedataobtainedinthisstudycanbeusedtorefineexplorationstrategiesandunderstandthepotentialforadditionaltungsten-tinmineralizationintheregion.Overall,thisstudydemonstratesthevalueoffluidinclusionanalysesinthestudyoforedepositsandmineralizationprocesses.Inadditiontoprovidinginsightsintotheformationoftungsten-tindeposits,theresultsofthisstudyhavepracticalapplicationsforexplorationandminingcompanies.Thedataobtainedfromfluidinclusionanalysescanbeusedtoidentifymineralizationpatternsandguidefurtherexplorationefforts.Understandingtheoriginandcompositionofore-formingfluidscanalsocontributetotheoptimizationofminingandprocessingmethods,whichcanreducewasteandimproveefficiency.

Furthermore,thefindingsofthisstudyhighlighttheimportanceofconductingmultidisciplinaryresearchinthestudyofmineralsandores.ThefactthattheTaoxikengdepositwasformedthroughtheinteractionoftwodistincttypesoffluidsunderscorestheneedforacomprehensiveunderstandingofbothgeologicalandchemicalprocesses.Thistypeofinterdisciplinaryresearchrequirescollaborationacrossdisciplinesandresearchinstitutions,whichcanleadtonewdiscoveriesandadvancementsinthefield.

Overall,thestudyoftheTaoxikengscheelite-tindepositprovidesvaluableinsightsintothecomplexprocessesthatcontributedtoitsformation.Bycombiningfieldobservations,mineralogy,geochemistry,andfluidinclusionanalyses,researcherswereabletogainamorecomprehensiveunderstandingofthedeposit'sgenesis.Thistypeofapproachcanbeappliedtootheroredeposits,helpingtounlockthesecretsofmineralformationandenhanceexplorationandminingefforts.TheinsightsgainedfromthestudyoftheTaoxikengscheelite-tindepositcanalsocontributetoourunderstandingofglobalmineralresources.Tungstenandtinareessentialelementsforthemanufactureofelectronicdevices,suchassmartphones,computers,andsolarpanels.Asthedemandforthesedevicesincreasesworldwide,thedemandfortungstenandtinisalsoexpectedtogrow.Understandingtheformationmechanismsoftungsten-tindepositscanhelptoidentifynewmineralresourcesandimproveresourcemanagementpractices.

Moreover,theresearchhasbroaderimplicationsforthestudyoffluid-rockinteractionsingeologicalsettings.Thestudyoffluidinclusionscanprovideinformationabouttheevolutionandpropertiesofhydrothermalfluids,whichcanhaveasignificantimpactonprocessessuchasmineralizationandmetamorphism.Understandingthechemicalcompositionoffluidscanalsohelptoimproveourunderstandingofthepathwaysandprocessesbywhichfluidsmigratethroughrocks,whichcancontributetothestudyofgeologicalhazardssuchasearthquakesandvolcaniceruptions.

Lastly,thestudyoftheTaoxikengdepositcanalsohavesocio-economicimplications.ThedepositislocatedinaremoteandunderdevelopedregionofChina,andthedevelopmentofminingactivitiescouldpotentiallycontributetotheeconomicgrowthoftheregion.However,aswithanyminingoperation,therearepotentialenvironmentalimpactsthatshouldbeconsideredandmitigated.Thestudyofthedepositanditsformationmechanismscancontributetothedevelopmentofsustainableminingpracticesthatbalanceeconomicdevelo