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赣南中侏罗世正长岩-辉长岩的起源及其地质意义.pdf


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10000569/2007/023(06)145769 ActaPetrologicaSinica 岩石学报
赣南中侏罗世正长岩辉长岩的起源及其地质意义
贺振宇1 徐夕生1 陈荣2 邢光福2
HEZhenYu1,XUXiSheng1 ,CHENRong2andXINGGuangFu2
1.南京大学地球科学系 成矿作用国家重点实验室,南京 210093
2.南京地质矿产研究所,南京 210016
1.StateKeyLaboratoryofMineralDepositResearch,DepartmentofEarthSciences,NanjingUniversity,Nanjing210093,China
2.NanjingInstituteofGeologyandMineralResources,Nanjing210016,China
20070227收稿,20070523改回.
HeZY,XuXS,ChenR andXingGF.2007.GenesisofMiddleJurassicsyenitegabbroinsouthernJiangxiprovinceand
theirgeologicalsignificance.ActaPetrologicaSinica,23(6):1457-1469
Abstract  ItiswellknownthattheSyenitegabbroassociationmayoriginatefrom eithertheevolutionofasinglemagmaortwo
independentmagmaswhichareusuallyrelatedtointraplateextensionaltectonics.Inthisstudy,wefocusonthegeochronologyand
petrochemistryofMiddleJurassicHuangbusyeniteandChebugabbrofromsouthernJiangxiProvince.LAICPMSUPbagesofboth
HuangbusyeniteandChebugabbroareveryconsistent(≈178Ma)withinerrorindicatethattheyweretheproductsofcontemporary
magmaactivities.ThemajorandtraceelementcompositionsandNdisotopegeochemicalcharacteristicsrevealthattheywerederived
fromdifferentsourcesinsteadofdifferentiationfromacomagmaticsources.Itissuggestedthattheymaybegeneratedfromlithospheric
mantlewhichwasmetasomatizedandenrichedbyasthenosphereoriginatedmelts,andthemeltingoccurredatthespinelgarnet
transitionzoneofuppermantle.Theyhadundergonelowextentofcontaminationbycrustalmaterialalongwithfractionalcrystallization.
However,HuangbusyenitecontainsmoreincompatibleelementsandhashigherCe/Yb,La/Yb,Sm/YbratiosandhigherεNd(t)
valuecomparedtoChebugabbro,whichimpliesthatthemagmasourceofHuangbusyenitewasrelativelydeeperandthusunderwent
higherdegreeofmetasomatism.Therefore,theHuangbusyeniteandChebugabbroprovideinsightintolithosphereasthenosphere
interactionunderintraplateextensionaltectonicsetting.
Keywords  MiddleJurassic,ZirconUPbdating,Syenitegabbro,Magmaticorigin,S

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