新疆阿尔泰大东沟铅锌矿床地质特征及稳定同位素地球化学研究_刘敏(15)

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GeologyandStableIsotopeGeochemistryoftheDadonggouPb-Zn

OreDeposit,Altay,Xinjiang,NWChina

LIUMin,ZHANGZuoheng,WANGYongqiang,GUOXuji

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1)MLRKeyLaboratoryofMetallogenyandMineralAssessment,InstituteofMineralResources,ChineseAcademyofGeologicalSciences,Beijing,100037; 2)No.706GeologicalParty,XinjiangGeoexplorationBureauforNonferrousMetals,Aletai,Xinjiang,836500

Abstract

BasedondetaileddescriptionofthegeologicalfeaturesoftheDadonggouPb-Znoredeposit,thispapersystematicallystudiedC,H,OandSistopiccompositionsofthedeposit.Theorebodyoccursinlayerswiththesametrendingasthestrata.OrebearingcountryrockismainlyvolcanicsedimentaryrockofthelowerDevonianKangbutiebuFormationandoreoccursinbanded,disseminatedandveinlet.Oremineralsconsistsimplyofgalena,sphaleriteandpyrite,withzinccontentrelativelyhigherthatoflead.Wal-lrock

alterationiswelldeveloped,andskarnizationwascloselyrelatedtoPb-Znmineralization.Accordingtothe

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C,H,OandSisotopiccompositionoftheore,theDSV-CDTvaluesofsulfidesrangefrom-22.3jto

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+11.7j,andDCV-PDBvaluesofcalciterangfrom-4.2jto+0.4j,theDOH2Ovaluesofquartzandcalciterangefrom-11.4jto+binedwithregionalgeologicaldata,theoredepositisconsideredtobeformedintheintermittentperiodofvolcanic-activities,andcontrolledbyNW-trendingfaults,volcanic-sedimentarybasinsandhydrothermalfluid,andthedepositbelongtoavolcanic-sedimentaryhostedmassivesulfidedeposit.Theoredepositwassubjecttoregionalmetamorphimandhydrothermalfluidalteration.

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