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Reactivation of the Archean lower crust:Implications for zircon geochronology,elemental and Sr-Nd-Hf isotopic geochemistry of late mesozoic granitoids from northwestern Jiaodong Terrane,the North China Craton

Reactivation of the Archean lower crust:Implications for zir...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： Kui-Feng Yang Hong-Rui Fan M.Santosh Fang-Fang Hu Simon A.Wilde Ting-Guang Lan Li-Na Lu Yong-Sheng Liu Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences Division of Interdisciplinary Science Faculty of ScienceKochi UniversityKochi 780-8520Japan Geoscience Frontiers China University of Geosciences State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences

The late mesozoic granitoids widely distributed in the nortliwestern Jiaodong Terrane are important markers of cratonic destruction and lithospheric thinning of the eastern North China Craton(NCC).Here we investigate the late Jurassic Linglong and Luanjiahe granites and report zircon U-Pb emplacement ages of 157- 159 *** rocks also contain abundant late Archean,Paleoproterozoic,Neoproterozoic,early Paleozoic and Triassic inherited zircons,suggesting the involvement of continental crustal materials from both the NCC and Yangtze Craton in magma *** rocks investigated in this study show high NaO + KO and low MgO and are peraluminous,with enrichment in LREEs and LILEs(Rb,Ba,U,and Sr) and depletion in HFSEs(Nb,Ta,P,and Ti).They also display lowε(t) values and high Sr/Y ratios,comparable to adakitic rocks,suggesting that the Linglong and Luanjiahe granitoids formed under relatively high pressure conditions and were likely derived from the partial melting of the thickened lower crust of the *** Guojialing granodiorites were emplaced in the early Cretaceous(129 Ma),and also contain abundant late Archean and Paleoproterozoic inherited *** rocks possess high CaO,TFeO and MgO,and are metalumrnous,with enrichment in LREEs and LILEs and depletion in *** are also characterized by high Sr/Y ratios,and have higherε(t) andε(t) values than the late Jurassic granitoids,suggesting the involvement of mantle components in the magmatic *** correlate the magma tectonics with the processes accompanying the subduction of the Pacific Plate beneath the NCC and the associated asthenospheric upwelling.

关键词： Geochemistry Zircon geochronology late mesozoic granitoids Northwestern Jiaodong Terrane North China Craton

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