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1、AbstractYincan-LanglikeareaislocatedinMenyuancountryofQinghaiprovince,whichbelongstoLenglonglingvolcanicbeltofNorthQilian,China,theregionmainlydevelopsYincanandLanglikethistwocopperpolymetallicdeposits.Basedontheformerresearchwork,wecarryoutextensiverese
2、arches,likemineralogicalcharacteristics,traceelementgeochemistry,stableisotope,U-Pbzircongeochronologyandsoon,investtheGeologicalcharacteristics,genetictype,metallogenicmechanism,tectonicsettingofmineralizationarea,metallogenicregularity,ore-controllingf
3、actors,metallogenicseries,metallogenicmodelandotherissuesaboutmetallogenicfeaturesforcopperpolymetallicdeposit,andthencomparewiththetypicaldepositsofthesametype,summarizecopperpolymetallicdepositprospectingmodelandprospectingdirectionofthisarea.Themainre
4、sultsareasfollows:1.Yincancopperpolymetallicdepositdevelopsabasalt-rhyolitebimodalvolcanicrocks,thebasaltischaracterizedbyhigh-Na,low-KandTi,similartoislandarctholeiiticbasalts，enrichedMg,high-CrandNi,withtheattributesofmantle-derivedprimitivemagma,thetr
5、aceelementsevidentlyindicatedepletionofNbandSr-positiveanomaly,relativelyenrichedinHREE;K2OofRhyolitecontentisverylow,itsapparentlossoftraceelementsNb-Ta,Th,SrandTi,enrichedinLILE;themineralizationmainlyoccursinacidicvolcanic(rhyolites).2.Themainejectedp
6、haseofLanglikecopperpolymetallicdepositsisandesiterock，subvolcanicfaciesrockisquartzdiorite,theandesiteandquartzdioritearebothcharacteristicsofenrichmentinmagnesium，high-CrandNi,significantlyenrichedinLILEandrelativelydepletedinHFSE,aswellasslightlyenric
7、hedinLREE;themineralizationdepositsinthequartzdioriteanditsadjacentandesite.3.Studyingonthedepositcharacteristicsandmineralizationoftypicaldeposits，andestimatingtheYincancopperpolymetallicdepositisaintra-oceanicsubductionislandarcriftformedbymarinevolcan
8、icdeposit,theLanglikecopperpolymetallicdepositisaislandarcporphyryCupolymetallicdeposit;thediscoveryofPorphyrycopperdepositisthefirstcaseintheNorthQilianarea.4.WithLA-ICP-MSzirconU-Pbdating,theresultsdemonstratethatthebasa
