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1、2014年4月礦床地質(zhì)第33卷第2期April,2014MINERALDEPOSITS33(2):373~385文章編號(hào):0258—7106(2014)02—0373—13內(nèi)蒙古朝不楞鐵銅鋅鉍礦床的地質(zhì)特征及礦床成因王必任,周志廣2,李樹才,柳長峰2,周毅,馮俊嶺(1國土資源實(shí)物地質(zhì)資料中心,河北燕郊065201;2中國地質(zhì)大學(xué),北京100083)摘要內(nèi)蒙古朝不楞鐵銅鋅鉍礦床位于二連浩特一東烏旗多金屬成礦帶的東段,其礦化蝕變沿著花崗巖體與圍巖的接觸帶分布。在外接觸帶,大理巖熱液蝕變形成了進(jìn)化矽卡巖,由石榴子石、輝石、硅灰石和方解石組成,泥質(zhì)砂巖蝕變成角巖,由角閃石、黑云母、長石和石英組成。矽卡
2、巖或角巖經(jīng)退化蝕變形成了鐵氧化物礦化,由磁鐵礦、磁赤鐵礦和鏡鐵礦組成,伴隨有綠簾石、方解石、螢石和黑云母蝕變;晚期熱液退化蝕變形成了硫化物,由黃銅礦、白鐵礦、黃鐵礦、輝鉬礦、閃鋅礦、輝鉍礦和自然鉍組成,伴隨有透閃石、綠泥石、螢石、石英和方解石蝕變。在內(nèi)接觸帶,花崗巖的熱液蝕變形成了鉀化,由鉀長石、黑云母和少量石榴子石組成,隨后被退化綠簾石、方解石和少量磁鐵礦交代;晚期退化蝕變形成了硫化物脈,伴隨有黑云母、方解石、石英和螢石蝕變。流體包裹體爆裂溫度結(jié)果表明,該礦床形成于淺成(1.7~3.5km)、高溫環(huán)境,成礦熱液具有從高溫向低溫多階段演化的冷卻史。礦床的地質(zhì)、礦物組合特征及成礦物理化學(xué)條件顯示
3、出該礦床屬于淺成、高溫、近端的矽卡巖型礦床。關(guān)鍵詞地質(zhì)學(xué);矽卡巖;朝不楞鐵銅鋅鉍礦床;內(nèi)蒙古中圖分類號(hào):P618.31;P618.41;P618.43;P618.69文獻(xiàn)標(biāo)志碼:AGeologicalcharacteristicsandoregenesisofChaobulengFe-Cu-Zn-BidepositinInnerMongoliaWANGBiRen,ZHOUZhiGuang2,LIShuCai,LIUChangFeng2,ZHOUYiandFENGJunLing(1CoresandSamplesCenterofLandandResources,C2;S,YaNiao065201,
4、Hebei,China;2ChinaUniversityofGeosciences,Beijing100083,China)AbstractTheChaobulengFe.-Cu—-Zn—.BidepositislocatedintheeasternpartoftheErlianhot-·DongujimqinBannermetallogenicbeltofInnerMongolia.Mineralizationandalterationoccuralongthecontactzonebetweenthegraniteandthewallrock.Neartheintrusion,progra
5、deskarn,withanassemblageofgarnet,pyroxene,wollas—toniteandcalcite,wasdevelopedinmarbleorhornfelsthatconsistedofhornblende,biotite,plagioclaseandquartzandoccurredinmud—sandstonebythefluidmetasomatism.Subsequently,retrogradealterationofskarnorhornfelsformedFe—oxidemineralization,consistingofmagnetite,
6、maghemiteandspeculariteandaccompaniedbytheepidote,calcite,fluoriteandbiotitealteration.Anextensivesulfidemineralizationoccurredduringthelastretrogradealteration,withanassemblageofchalcopyrite,pyrite,marcasite,sphalerite,molybdenite,bis—muthiniteandbismuth,accompaniedbythetremolite,chlorite,fluorite,
7、quartzandcalcitealteration.Attheedgeofthepluton,potassicveinsconsistingofK—feldspar,biotiteandminorgarnetwereformedbymetasoma—tismofgranite,andaretrogradealterationcomprisingtheepidote,calciteandmagne