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1、StructuralGeochemicalStudyoftheYuxiFold-ThrustBeltintheSouthernNorthChinaPlateJournaz0fChinaUniversityoJGeosciences,Vo1.17,No.2,P.95—102,June2006PrintedinChinaIssN1002—0705StructuralGeochemicalStudyoftheYuxiFold-ThrustBeltintheSouthernNorthChinaPlateLiWenyong(李文勇)Sfh00fDfEar
2、thSciencesandResources,ChinaUniversityofGeosciences,Beijing100083,China;G¨ngzhouMarineGeologicalSurvey,MinistryofLandandResources,Guangzhou510760,ChinaXiaBin(夏斌)CASKeyLaboratoryofMarginalSeaGeology,GuangzhouInstituteofGeochemistry,Guangzhou510640,ChinaLiDongxu(李东旭)Sch00lofEa
3、rthSciencesandResources,C^inaUniversityofGeosciences,Beijing100083,ChinaABSTRACT:TheYuxi(豫西)fold~thrustfracturebeltispartoftheganticfold-thrustfracturebeltthatextendsNWinthesouthernNorthChinaplate.ThecontentsofmaJorelementsoftectoniteswereanalyzedbvICP-AES.Theanalysisofchemi
4、calcompositionsandnewstressmineralsindicates:extendingfromthesurroundingcountryrockstothecenterofthefracturebelt.theFe2O3contentgraduallyincreaseswhiletheFe0contentgraduallydecreases;regularincrease,decreaseorpeakchangesareshownforchemicalcompositionslikeSiO2,AkO3,Fe203,MgO,
5、CaO,FeO,lossonignition,T10I,K2o.N0.etc..Newstressmineralsaredevelopedforthesouthbranchandfewforthenorthbranch.ThecharacteristicsofchemicalcompositionsandnewstressmineralsofthethrustfracturedemonstratethatthefracturebeIthasundergoneaprocessfromaclosedreducingenvironmentalsyst
6、emtoarelativelyopen.oxidizingenvironmentalsystem,andcompressivefractureshaveresultedfromcompressioninthelatesta.gesofevolution,andthedynamothermalmetamorphismandthrustingintensities8redifferentbetweenthesouthandnorthbranchesofthebeIt,whichisstrongforthesouthbranchbutrelative
7、lyweakforthenorthbranch.KEYW0RDS:structuralgeochemistry.thrustfracturebeIt,Yuxi,southernNorthChinaplate.Thegiganticfold—-thrustfracturebeltrhatex——tendsfor900kmtotheNWiDthesouthernNofthChinaplatestridesacrossthreeprovinces:Shaanxi,HenanandAnhui.Itisoneofthemostcharacteristic
8、structuraldeformationsintheNorthChinaplate.Alongthisstructuralbeltaseriesof
