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1、AbstractTheTawenchahanxiFe-polymetallicdepositislocatedinthesoutheastsection（probably300degreesdirection）oftheQimantageHillinQinghaiprovince,whichisabout200kmfromthenorthwestofGeermucity.Inrecentyears,itisanothermedium-sizedFe-polymetallicdepositaftertheShaqiu,ChangshanandNiukutoudeposits,
2、whichcontainsmorethan40milliontonsofprovenironoreresources.Theorebodyandore-formingrockmassarecoveredbyQuaternaryeoliansand.ThegeotectonicpositionofminingareaislocatedintheNorthQimantageEarlyPaleozoicmagmaticarcbelt,whichisalsolocatedinthenorthofNalinggelefractureintheEastKunLun.Thedeposit
3、islocatedamongeastlongitude292°31'-92°52',northlatitude36°55'-37°00',withatotalareaabout100km.Throughanalysisthegeologicalcharacteristics,themineralizationalterationzoningofthedepositandgeochemicalcharacteristicsoftheore-formingrockmass,thisarticleisinordertofindoutthegeologicalgenesisofth
4、edeposit,mineralization,orecontrollingfactorsandprospectingmodel.Bycomparingwithotherdeposits,inthelargerareaestablishthemaintypeoforedepositandsummarizethemetallogenicregularity,soastoguidethemineralexplorationandpractice.Finally,relatedtotherelationshipoftectonicmagmaticmineralizationinQ
5、imantageareaandthegeologicalcharacteristicsandgenesisofthedeposit,wegetthemainresearchresultsareasfollows：（1）CardingsummeduptheconclusionsthatinEarlyTriassicapproximatelyduring（242~239Ma）,thewesternofEast-Kunlunorogenicbelt(Qimantagearea)isduringthetransitionstagewhichisintheendoftheoceani
6、ccrustsubductiontothebeganofthecontinentalcrustcollision,whiletranslateintostretchafterthecollisionstageduring（237~204Ma）.Atthesametimethemantle-derivedmagmainvasionandcrust-mantlemixingactionhasoccurredonalargescale.Especially,theMiddle-LateTriassic(210~237Ma)granitoidsarepredominantandmo
7、stcloselyrelatedwithmineralization.（2）BytheLA-ICP-MSzirconU-Pbdating,thispapergetstheporphyriticgranodioriteintheZK25408borehole,（236.12±1.2Ma）Ma,whichrepresentthemagmaticcrystallizationage,belongingtotheTriassic（T2）.Accordancingwiththepreviousscholars’results
