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1、2005年10月地球學報Oct.200526卷5期:435442ACTAGEOSCIENTICASINICA26(5):435442內蒙古黑鷹山富鐵礦床磷灰石稀土元素地球化學特征聶鳳軍江思宏劉妍中國地質科學院礦產資源研究所,北京,100037摘要筆者首次對內蒙古西部黑鷹山富鐵礦床兩類鐵礦石磷灰石進行了稀土元素含量分析,致密塊狀鐵礦石6件磷灰石-6樣品REE含量變化范圍為(14776.86~21313.18)10,LREE/HREE比值為8.31~9.18,Eu為0.37~0.40。相比之-6下,脈狀鐵礦石2件
2、磷灰石樣品REE含量變化范圍為(18143.05~20665.82)10,LREE/HREE比值為9.03~9.18,Eu為0.39。所有8件磷灰石稀土元素分配型式均為一組向右傾斜,并且具有明顯銪負異常的曲線。黑鷹山鐵礦床中磷灰石的最顯著特點是稀土元素含量明顯高于國內外同類鐵礦床磷灰石,為我國寧蕪鐵礦床和瑞典基魯納鐵礦床磷灰石的4~10倍。根據磷灰石樣品的地球化學特征,并且結合其他巖(礦)相學特征和釤釹同位素數據,可以推測,磷灰石的形成作用與海西早期構造巖漿活動有關,富鐵礦床很可能是富堿巖漿熱液流體噴溢或上侵定位的產物,成礦(巖)物質主要來自以幔源物質為主的殼
3、?；煸磶r漿房。關鍵詞富鐵礦床磷灰石稀土元素礦床成因黑鷹山內蒙古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
