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1、2005年10月地球学报Oct.200526卷5期:435442ACTAGEOSCIENTICASINICA26(5):435442内蒙古黑鹰山富铁矿床磷灰石稀土元素地球化学特征聂凤军江思宏刘妍中国地质科学院矿产资源研究所,北京,100037摘要笔者首次对内蒙古西部黑鹰山富铁矿床两类铁矿石磷灰石进行了稀土元素含量分析,致密块状铁矿石6件磷灰石-6样品REE含量变化范围为(14776.86~21313.18)10,LREE/HREE比值为8.31~9.18,Eu为0.37~0.40。相比之-6下,脉状铁矿石2件
2、磷灰石样品REE含量变化范围为(18143.05~20665.82)10,LREE/HREE比值为9.03~9.18,Eu为0.39。所有8件磷灰石稀土元素分配型式均为一组向右倾斜,并且具有明显铕负异常的曲线。黑鹰山铁矿床中磷灰石的最显著特点是稀土元素含量明显高于国内外同类铁矿床磷灰石,为我国宁芜铁矿床和瑞典基鲁纳铁矿床磷灰石的4~10倍。根据磷灰石样品的地球化学特征,并且结合其他岩(矿)相学特征和钐钕同位素数据,可以推测,磷灰石的形成作用与海西早期构造岩浆活动有关,富铁矿床很可能是富碱岩浆热液流体喷溢或上侵定位的产物,成矿(岩)物质主要来自以幔源物质为主的壳
3、幔混源岩浆房。关键词富铁矿床磷灰石稀土元素矿床成因黑鹰山内蒙古RareEarthElementFeaturesofApatiteSeparatedfromtheHeiyingshanHighGradeIronDeposit,InnerMongoliaNIEFengjunJIANGSihongLIUYanInstituteofMineralResources,CAGS,Beijing,100037AbstractLocatedatsoutheasternpartoftheHongshishanHeiyingshanterranewithintheKaz
4、akhstanianBeishanplate,theHeiyingshandepositisoneofthemostimportanthighgradeirondepositsinnorthwesternChina.IronmineralizationoccurswithinEarlyCarboniferousdacite,rhyolite,daciticlavaandbrecicaofBaishanFormationintheformsofmassiveblocks,stratoidlayers,lensandveins.Theironbearinginterm
5、ediateacidvolcanicsequencesarecutbyanumberofHercynianmaficandgranitoiddykesandcontrolledbyquiteafewNEandEWtrendingfractureorfaultzones.Individualironorebodiescanbetracedalongthestrikefor115to200m,anddowndipfor100to200m,being4to12minthickness.Moreover,severalindependentyttriumorebodies
6、werefoundwithintheirondeposit.Althoughapatitepredominatesoverironbearingminerals,nodifferencehasbeenobservedbetweentheironandyttriumorebodiesingeologicalsetting,wallrock,mineralassemblageandattitude.Mineralogicalcompositionofbothironandyttriumoresisrelativelysimple,consistingofmagnetite,
7、hematiteandtraceamountsofpyrite.Ganguemineralsincludeapatite,quartz,chlorite,andhornblende.EightapatiteseparatesfromthemassiveandveintypeironoreswereselectedforREEanalysis.-6-6TheREEcontentoftheeightapatitesamplesrangesfrom1477610to2131310,fourtimesthatoftheapatit
