The Origin of the Early Proterozoic Kuandian Complex: Evidence from Geochemistry-中国期刊网

摘要 TheKuandianComplexisscarcelypreservedEarlyProterozoicvolcanicsuite,formed2.3-2.4Gaago.ItislocatedinanEarlyProterozoicmobilebeltboundedbytheArchaeanRangrimandRyonggangBlocksofthenortheasternSino-KoreanCraton.TheComplexismainlymadeupofamphibolites,gneisses,leucoleptite,leptiteandlayeredgranite.PetrologicalandgeochemicalstudiesshowthattheprotolithsoftheComplexaremainlyassoctationsofbimodalvolcanicsandanorogenicgranites.TheKuandianamphibolitesaredepletedinNb,Ta,PandTi,andenrichedinLILE,e.g.K,RbandCs,withpronounceddepletionofSrrelativetoNdandPb;La/Nbratiosarehigherthan1（1.75to5.18）.ThetraceelementpatternsoftheamphibolitesaresimilartocontinentalfloodbasaltsformedbytheGondwanabreak-up,suchasthoseinSouthKarooandTasmania,whichshowscontinentalcontamination.εNdvaluesrangingfrom0.70to1.94oftheKuandianamphibolitesandtherelationshipsbetweenNb/YbandLa/Ybsuggestthatcontaminationofbasalticmagmahappenedinthemantle,ratherthanalongtheconduit.Isotoperatiosof208Pb/204Pb,207Pb/204Pb,206Pb/204Pb,143Nd/144Ndand87Sr/86SrindicatethatthemagmawasderivedfromacontaminatedmantlesourcelikeDMMoramixtureofDMMandEM2.TheKuandianComplexhasDupalanomaly,asisthecasewithsomecontinentalbasaltsinthesouthhemisphere,e.g.inSouthKarooandTasmania.PetrochemicalmodellingproposesthattheKuandiangneiss,granite,andamphibolitecamefromthesameparentalmagma,beingproductsofstrongfractionalcrystallization.ProtolithsoftheKuandianComplexwereformedinextensionaltectonicsettingduringthetransitionfromcontinentalcrusttooceaniccrust.TheformationoftheKuandianComplexindicatesthat2.3or2.4GaagotectonicevolutionoftheSino-Koreancratonwasdifferentfromthatofotherwell-studiedPrecambriancratons,e

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The Origin of the Early Proterozoic Kuandian Complex: Evidence from Geochemistry

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The Origin of the Early Proterozoic Kuandian Complex: Evidence from Geochemistry

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