Neoproterozoic zircon inheritance in eastern North China craton(China) Mesozoic igneous rocks:derivation from the Yangtze craton and tectonic implications

作     者：Laicheng Miao~(a*),Fuqin Zhang~a,Weiming Fan~a and Dunyi Liu~b a Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,China b Beijing SHRIMP Centre,Institute of Geology, Chinese Academy of Geological Sciences,Beijing,China 

会议名称：《中国科学院地质与地球物理研究所第11届（2011年度）学术年会》

会议日期：2012年

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：supported by the Chinese Academy of Sciences(Grant No.KZCX1-YW- 15-1) the Chinese SINOPROBE Project(Grant No.SinoProbe-08-01) the Ministry of Science and Technology of China(Grant Nos.2007CB411403,2006CB403504) 

关 键 词：inherited zircons felsic igneous rocks underplating of the NCC Mesozoic magmatism North China craton 

摘      要：We propose that inherited Neoproterozoic zircons in Mesozoic igneous rocks from the eastern portion of the North China craton(NCC) were initially derived from the Yangtze/South China block,rather than from the NCC *** mechanism that introduced these zircons into the NCC was likely tectonic underplating during Triassic continental subduction/collision of the Yangtze block beneath the *** addition of abundant crustal materials represented by the exotic zircons,probably along the Moho or weak interfaces within the NCC crust,led to the crustal thickening of the *** sialic materials contributed significantly to the Mesozoic igneous rocks, either as source rocks or as contaminants of magmas generated during an extensional environment following crustal *** thickening was spatially linked to lithospheric thinning,with both occurring mainly in the eastern segment of the NCC, suggestive of an intrinsic relationship between thickening and thinning events during Mesozoic evolution of the NCC.