Geochemistry of Alkali-rich Igneous Rocks of Northern Xinjiang and Its Implications for Geodynamics-中国期刊网

摘要 FivenearlyE-W-trendingalkali-richigneousrockbeltsaredistributedfromnorthtosouthinnorthernXinjiang,andtheyarecomposedmainlyofriebeckite,K-feldspargraniteandhigh-Kandmedium-Kcalc-alkalinevolcanicrocksandshoshonite.TheyweremainlyemplacedoreruptedbetweentheCarboniferousandPermian.ThecompositionsofSr,Nd,Pb,andOisotopesimplythattheirprincipalresourcematerialsarederivedfromtheuppermantleorjuvenilecrust,indicatingobviouscontinentalgrowthinthePhanerozoic.Thetraceelementassociationimpliesthattheirtectonicsettingsarewithinplateandvolcanicarcforalkali-richgranites,andpost-collisionalarc,lateoceanicarcandcontinentalarcforalkali-richvolcanicrocks.AnarchipelagomodelwassuggestedforthetectonicevolutioninnorthernXinjiang.Itcanbenamedthecentral-Asia-typeorogeny,whichisdifferentfromthesocalledcircum-Pacificocean-continent-typetectonicsortheAlpine-Himalayancontinent-continent-collisional

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Geochemistry of Alkali-rich Igneous Rocks of Northern Xinjiang and Its Implications for Geodynamics

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Geochemistry of Alkali-rich Igneous Rocks of Northern Xinjiang and Its Implications for Geodynamics

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