Zircon U-Pb geochronology,geochemistry and Sr-Nd-Pb isotopes from the metamorphic basement in the Wuhe Complex:Implications for Neoarchean active continental margin along the southeastern North China Craton and constraints on the petrogenesis of Mesozoic granitoids  

作　　者：Andong Wang Yican Liu M.Santosh Xiaofeng Gu 

机构地区：[1]CAS Key Laboratory of Crust-Mantle Materials and Environments,School of Earth and Space Sciences,University of Science and Technology of China [2]Division of Interdisciplinary Science,Faculty of Science,Kochi University,Akebono-cho 2-5-1,Kochi 780-8520,Japan [3]China University of Geosciences(Beijing)

出　　处：《Geoscience Frontiers》2013年第1期57-71,共15页地学前缘（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.90814008,40634023 and 40973043);the National Basic Research Program of China (Grant No.2009CB825002)

摘　　要：We report zircon U-Pb geochronology,geochemistry and Sr-Nd-Pb isotope data from mafic granulites and garnet amphibolites of the Wuhe Complex in the southeastern margin of the North China Craton (NCC).In combination with previous data,our results demonstrate that these rocks represent fragments of the ancient lower crust,and have features similar to those of the granulite basement in the northern margin of the NCC.A detailed evaluation of the Pb isotope data shows that Pb isotopes cannot effectively distinguish the role of the Yangtze Craton basement from that of the NCC basement with regard to the source and generation of magmas,at least for southeastern NCC.The age data suggest that the protoliths of the granulites or amphibolites in the Wuhe Complex were most likely generated in Neoarchean and that these rocks were subjected to Paleoproterozoic(1.8-1.9 Ga) high-pressure granulite facies metamorphism. This study also shows that the Precambrian metamorphic basement in the southeastern margin of the NCC might have formed in a tectonic setting characterized by a late Neoarchean active continental margin.

关 键 词：Precambrian metamorphic basement North China Craton Sr-Nd-Pb isotope Active continental margin 

分 类 号：P597.3[天文地球—地球化学]