Zircon SHRIMP U-Pb dating for gabbro at Chaotiehe in the Haicheng area, eastern Liaoning

查看全文 作　　者：MIAO [1]LaiCheng;ZHANG [1]FuQin;LIU [2]DunYi;SHI [2]YuRuo;XIE [2]HangQiang

机构地区：[1]Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;[2]Beijing SHRIMP Centre, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

出　　处：《Chinese Science Bulletin》索引2010年第55卷第4期,共8页

基　　金：supported by the National Natural Science Foundation of China (Grant No. 40773025);the Ministry of Science and Technology of China (Grant No. 2006CB403504) 摘　　要：Chaotiehe gabbroic intrusion in the eastern part of Liaoning Province was dated by the zircon SHRIMP U-Pb technique. The results gave an emplacement age of 126±4 Ma, indicating that the intrusion thus formed during the lithospheric thinning of the North China Craton (NCC) in the Early Cretaceous rather than in a rifting setting during the Paleoproterozoic as previously thought. The gabbroic intrusion contains abundant old zircons with Paleoproterozoic (2.10-2.46 Ga and ca. 1.87 Ga) and Neoproterozoic (747-969 Ma) ages. The Paleoproterozoic zircons were probably derived from NCC itself, whereas the Neoproterozoic ones were likely from materials of the Yangtze Craton that had previously been subducted beneath NCC. These geochronological dates are of important implications for understanding the Mesozoic crustal evolution of NCC. 关键词：锆石SHRIMP 辉长岩海城地区辽宁东部 Pb 古元古代同位素年代学侵位年龄

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Zircon SHRIMP U-Pb dating for gabbro at Chaotiehe in the Haicheng area, eastern Liaoning

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