青海祁漫塔格地區(qū)它溫查漢西鐵多金屬礦床地質特征與成因探討-(6240)

青海祁漫塔格地區(qū)它溫查漢西鐵多金屬礦床地質特征與成因探討-(6240)

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時間:2019-02-28

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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

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