華南新元古代花崗巖鋯石Hf和O同位素地賕化學(xué):地幔欄頭效應(yīng)?鄭永飛吳元保張少兵趙子福中國科學(xué)技術(shù)大學(xué)地球和空間科學(xué)學(xué)院徐平吳福元中國科學(xué)院地質(zhì)與地球物理研究所李獻華中國科學(xué)院廣州地球化學(xué)研憲所季正祥西澳大學(xué)地質(zhì)與地理系構(gòu)造研究中心科學(xué)問題華南新元古代花崗巖成因?裂谷vs地慢柱vs島弧地幔柱巖漿與島弧巖漿的識別?構(gòu)造vs地球化學(xué)ws巖石學(xué)板塊俯沖是否啟動了地幔柱?OIBVSCFB華南新元古代巖漿巖分布4艸14M圍H75MaDrtheaneisseShanghai748+(-12MaYangtze79+1酗KangdiandgNanhuariflesRift76148M34ongKong少P「gandNecentnrooninniwwan新元古代幕式巖漿活動800-830740~780N4Southchin720740760780800820840860880Australia720740760780800820840860880(LiZXetaL.,2019)LiXHetal.(2019)PrecamResPlumegenesisNorthChina新元SiberiandiaAustraliAntarcticAfricanSoutLaurentiablocksChinaBalticaSouthAmericanblocksRodiniasuperplumeoLocationofca.840-740Migneousactivities古代地幔超柱事件Extensionaxes,includingfailedcontinentalriftandoceanridges新元古代早期揚子板塊周邊ZhouJCetal.(2019)ZhouMFetal.(2019)EPSIWangXLetal.(2019)Arcgenesis?chengduBasinSubductionzoneFOceaniclithosphere9NeoproterozoicaregreFREAContinentalbasementEpisodicgrowthofJuvenilecrust>Subductionzone:ArcMagmatism>Mantleplume:OceanicPlateauRiftmagmatismUpliftofmantleplumeisevidencedbyarapid,pre-volcanicuplift地幔柱與地幔超欄hotspotType(2superplume淺柱WhiteKcKenzie1989)CampbellGriffithsMv(1990)深柱hotspotsuperplumelifetime:-100my.oOm.ymeltlargeextraordinarylargeHotspotsaroundtheworldRed:core-mantleboundary,ye