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1、1000-0569/2011/027(02)-0383-97ActaPetrologicaSinica岩石学报*镁同位素地球化学研究新进展及其应用1,22,32,32,42**柯珊刘盛遨李王晔杨蔚滕方振1,22,32,32,42**KEShan,LIUShengAo,LIWangYe,YANGWeiandTENGFangZhen11中国地质大学地质过程与矿产资源国家重点实验室,北京10008321IsotopeLaboratory,DepartmentofGeosciencesandArkansasCenterforSpacean
2、dPlanetarySciences,UniversityofArkansas,Fayetteville,AR7270131中国科学院壳-幔物质与环境重点实验室,中国科学技术大学地球与空间科学学院,合肥23002641中国科学院地质与地球物理研究所,岩石圈演化国家重点实验室,北京10002911StateKeyLaboratoryofGeologicalProcessesandMineralResources,ChinaUniversityofGeosciences,Beijing100083,China21IsotopeLabo
3、ratory,DepartmentofGeosciencesandArkansasCenterforSpaceandPlanetarySciences,UniversityofArkansas,Fayetteville,AR72701,USA31CASKeyLaboratoryofCrust-MantleMaterialsandEnvironments,SchoolofEarthandSpaceSciences,UniversityofScienceandTechnologyofChina,Hefei230026,China41S
4、tateKeyLaboratoryofLithosphericEvolution,InstituteofGeologyandGeophysics,ChineseAcademyofSciences,Beijing100029,China2010-09-01收稿,2010-11-20改回1KeS,LiuSA,LiWY,YangWandTengFZ120111Advancesandapplicationinmagnesiumisotopegeochemistry1ActaPetrologicaSinica,27(2):383-397Ab
5、stractAsnewgeologicaltracers,Mgisotopesattractmoreandmoreattentionsfrominternationalgeologists1GreatachievementshavebeenmadeintheMgisotopegeochemistry1Recentstudieshavebeenfocusingontwoaspects1First,Mgisotopiccompositionsofthemajorterrestrialreservoirsandchondriteshav
6、ebeeninvestigated1ChondritesandthemantlehavehomogeneousandsimilarMg26isotopiccompositions,withtheaverageDMgvaluesof-0128?0106jand-0125?0107j,respectively1Bycontrast,theupper26continentalcrustandhydrospherearehighlyheterogeneous,withDMgvaluesvaryingfrom-4184jto+0192jan
7、dfrom-2193jto+1113j,respectively1Second,studiesonbehaviorsofMgisotopesduringgeologicalandphysicochemicalprocessessuggestthat:(1)largeMgisotopefractionationoccursduringcontinentalweatheringwithheavyMgisotopesretainedintheweatheredproductsandlightMgisotopesreleasedintot
8、hehydrosphere;(2)equilibriumMgisotopefractionationduringmagmadifferentiationislimited;(3)significantkineticMgisotopefraction
