Chronology and Sources of Mesozoic Intrusive Complexes in the Xuzhou-Huainan Region, Central China:Constraints from SHRI
SHRIMP zircon U-Pb dating in the Liguo and Jiagou intmsives indicates that they were formed at ～130 Ma in the Early Cretaceous. Most inherited zircons in the Liguo intrusive were formed at 2509±43 Ma. Most inherited and detrital zircons in the Jiagou intrusive were formed at ~2500 Ma, ～2000 Ma and ～1800 Ma. The SHRIMP zircon U-Pb dating in two gneiss xenoliths from the Jiagou intrusive yields the ages of 2461+22 Ma and 2508±15 Ma, respectively. The dating results from inherited and detrital zircons in the intmsives and the gneiss xenoliths imply that the magmas could be derived from the partial melting of the basement of the North China Block (NCB). The magmatism is strong and extensive in the periods from 115 to 132 Ma, which is of typical bimodal characteristics. It is suggested that the lithospheric thinning in the eastern North China Block reached its peak in 115-132 Ma.
作 者： XU Wenliang WANG Qinghai LIU Xiaochun WANG Dongyan Guo Jinghui 作者单位： XU Wenliang,WANG Qinghai,WANG Dongyan(College of Earth Sciences, Jilin University, Changchun, Jilin 130061)LIU Xiaochun(Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081)
Guo Jinghui(Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029)
刊 名： 地质学报(英文版) SCI 英文刊名： ACTA GEOLOGICA SINICA 年，卷(期)： 2004 78(1) 分类号： 关键词： Mesozoic intrusive complex zircon U-Pb dating source of magma Xuzhou-Huainana region China