31310.粵北諸廣山外圍中生代花崗巖年代學、地球化學與巖石成因研究

1、南京大學碩士學位論文DissertationforMaster’SDegreeofNanjingUniversity粵北諸廣山外圍中生代花崗巖年代學、地球化學與巖石成因研究GeochronologyGeochemistryandPetrogenesisofMesozoicGranitePeripheralAreaoftheZhuguangshanintheNorthGuangdongProvince碩士研究生：孫立強MSDCandida

2、te：SUNLi—qiang指導老師：凌洪飛教授Supervisor：ProfessorLINGHong—fei專業(yè)：礦物學、巖石學、礦床學Speciality：MineralogyPetrologyandEconomicGeology南京大學地球科學與工程學院SchoolofEarthSciencesandEngineering，NanjingUniversity二零一一年五月南京May2011，NanjingTHESIS：Geoch

3、ronologyGeochemistryandPetrogenesisofMesozoicGranitePeripheralAreaoftheZhuguangshanintheNorthGuangdongProvinceSPECIALIZATION：Mineralogy，PetrologyandEconomicGeologyPOSTGRADUATE：SUNLi—qiangMENTOR：ProfLINGHong—feiFourMesozo

4、icgraniteplutons，includingthePingtianbiotitegranite，theLongyuanbabiotitegranite，theYoushanbiotitegraniteandtheLingxiamphibole—biotitemonzogranite，whicharelocatedinthenoahofGuangdongProvincehavebeenstudiedforLA—ICPMSzirco

5、nUPbagesandwholerockelementalandSrNdisotopiccompositionstoconstraintheirsourcesandtectonicsettingsThisstudyalsoassessestheprospectingpotentialforuraniumdepositofthefirstthreegranite，whichwereformedbytheIndosinianmagmatis

6、meventsThePingtianbiotitegraniteandtheLongyuanbabiotitegraniteexhibitStypecharacteristicsTheircrystallizationagesare238822Maand229822Ma，respectivelyindicatedthattheywereformedbytheearlyIndosinianmagmatismeventsPlotsofthe

7、setwoplutonsshowregulardistributiononthemajorelementsandtraceelements，indicatingconsistentevolutionaltrendsItsuggeststhattheyweretheproductsofthesameparentalmagmathroughdifferentdegreeoffractionalcrystallizationIntegrate

8、dgeologicalsetting，geochemicaldataandSrNdisotopiccompositionssuggestedthatthesetwoplutonswereformedaftertectonicconversionofpost—collisionfromcompressiontoextension，andderivedfromthepartialmeltingofthePaleoproterozoicdep

9、letedmantlesourcedcrustTheYoushanbiotitegraniteexhibitsS—typecharacteristicsItscrystallizationageis2134士3OMaindicatedthatitwasformedbythelateIndosinianmagmatismeventsFromallthegeochemicalandSrNdisotopiccharacteristics，we

10、canconcludethattheYoushangranitewasderivedfromthepartialmeltingofthePaleoMesoproterozoicdepleted—mantle—sourcedcrustunderatensileenvironmentZirconUPbdatingfortheLingxiamphibolebiotitemonzograniteyieldsanageof1002士1OMaind

11、icatedthatitwasformedinearlyCretaceousIthasthegeochemicalcharacteristicsasadakitesuchashighSrSr／YandLa／Yb，lowYandYbIntegratedgeologicalsetting，geochemicaldata，SrNdisotopiccompositionsandtraceelementmodelingcalculationsug

12、gestthattheLingximonzograniteistheproductoflowdegreepartialmeltingoftheancientcrustandmetaigneousrocks，thelatterwereprobablyformedinearlyYanshanianThemainlyresidualmineralsareclinopyroxene，amphiboleandgarnetKeyWords：Zirc