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ID:52273508
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页数:19页
时间:2020-03-26
《青海西部祁漫塔格地区主要矽卡岩铁多金属矿床成矿地质背景和矿化蚀变特征.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2013年2月矿床地质第32卷第1期February,2013MINERALDEPOSITS32(1):1~19文章编号:0258—7106(2013)01—0001—19青海西部祁漫塔格地区主要矽卡岩铁多金属矿床成矿地质背景和矿化蚀变特征赵一呜,丰成友,李大新,刘建楠,肖晔,于淼,马圣钞(中国地质科学院矿产资源研究所,北京100037)摘要青海西部祁漫塔格地区矽卡岩铁多金属矿床分布广泛,目前已成为中国西部最重要和最有找矿潜力的矽卡岩铁多金属成矿带。在大地构造上,该地区属东昆仑造山带;成矿主要与印支期(204-237Ma)闪长岩、花岗闪
2、长岩和二长花岗岩有关;控矿地层包括蓟县系狼牙山组大理岩、硅质岩,奥陶系一志留系滩问山群大理岩、碎屑岩、硅质岩、中一基性火山岩和石炭系结晶灰岩、碎屑岩等。区内发育3类矽卡岩,即钙矽卡岩、镁矽卡岩和锰质矽卡岩,以前者为主。钙矽卡岩常伴生Fe、Cu、Mo(Pb,Zn)矿化,镁矽卡岩主要伴生Fe矿化,锰质矽卡岩则伴生Pb、Zn(Ag)矿化;矿石矿物组合多种多样,矿化具有一定的分带性。内接触带侵入岩广泛发育钾长石化,与矽卡岩类型一起构成该类矿床的重要找矿标志之一。关键词地质学;成矿地质背景;铁多金属矿床地质特征;矽卡岩类型;钾质交代现象;祁漫塔格
3、地区;青海中图分类号:P618.31文献标志码:AMetallogenicsettingandmineralization-alterationcharacteristicsofmajorskarnFe-polymetallicdepositsinQimantagarea,westernQinghaiProvinceZHAOYiMing,FENGChengYou,LIDaXin,LIUJianNan,XIAOYe,YUMiaoandMAShengChao(InstituteofMineralResources,ChineseAcadem
4、yofGeologicalSciences,Beijing100037,China)AbstractFe—polymetallicskarndepositsarewidelydistributedintheQimantagareaofwesternQinghaiProvince.Recently,thisareahasbecomeamajormetallogenicbeltwithmostpromisingorepotentia1.Geotectonically,itbelongstoEasternKulunorogenicbelt.M
5、ineralizationisrelatedtoIndosinian(204-237Ma)diorite,granodi—oriteandmozoniticgranite.Ore—controllingstrataarecomposedofmarbleandsilicaliteofmiddleProterozoicLangyashanFormation,marble,clasolite,silicaliteandandesite—basalticvolcanicrocksofOrdovician—SilurianTanjianshanG
6、roup,andcrystallinelimestoneandclasoliteofCarboniferousperiod.Intheoredeposits,threetypesofskarnsaredeveloped,i.e.calcic,magnesianandmanganoantypes,withthefirsttypebeingdominant.CalcicskarniscommonlyassociatedwithFe,Cu,Mo,(Pb,Zn)mineralization,magnesianskarnismainlyas—so
7、ciatedwithFemineralization,andmanganoanskarnisalwaysassociatedwithPb,Zn(Ag)mineralization.Mineralassemblageoftheoresisextremelyvariedandhascertainzonation.Potassicmetasomaticphenomenaareveryentensiveintheendo—contactzonesofthedeposits.Inadditiontodifferenttypesofskarns,p
8、otassicmeta—somatismalsoconstitutesoneoftheimportantore—searchingindicators.*本文得到中国地质调查局地质调查项目(编号:12120
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