31310.粵北諸廣山外圍中生代花崗巖年代學(xué)、地球化學(xué)與巖石成因研究

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

2、te：SUNLi—qiang指導(dǎo)老師：凌洪飛教授Supervisor：ProfessorLINGHong—fei專業(yè)：礦物學(xué)、巖石學(xué)、礦床學(xué)Speciality：MineralogyPetrologyandEconomicGeology南京大學(xué)地球科學(xué)與工程學(xué)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