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GAO Lin-zhi, DING Xiao-zhong, PANG Wei-hua, LIU Yan-xue, LU Song-nian, LIU YAO-rong, CHEN Jun, ZHANG Yu-hai. 2011: SRHIMP zircon U-Pb dating of metamorphic tuff from the Precambrian Cangxi Complex-Group in northeastern Hunan. Geological Bulletin of China, 30(10): 1479-1484. DOI: 10.12097/gbc.20111001
Citation: GAO Lin-zhi, DING Xiao-zhong, PANG Wei-hua, LIU Yan-xue, LU Song-nian, LIU YAO-rong, CHEN Jun, ZHANG Yu-hai. 2011: SRHIMP zircon U-Pb dating of metamorphic tuff from the Precambrian Cangxi Complex-Group in northeastern Hunan. Geological Bulletin of China, 30(10): 1479-1484. DOI: 10.12097/gbc.20111001
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SRHIMP zircon U-Pb dating of metamorphic tuff from the Precambrian Cangxi Complex-Group in northeastern Hunan

  • Institute of Geology, CAGS, Beijing 100037, China;2. Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170,China;3. Hunan Institute of Geological Survey, Changsha 410114, Hunan, China;4. The Beijing SHRIMP Center, Beijing 100037, China

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  • This paper reports a SHRIMP U-Pb age (855 Ma ± 5 Ma) of metamorphic tuff from the Fengzichong Complex-Formation. Although zircons have different forms, their CL images show typical magmatic oscillatory zoning. The zircons have relatively high content of U and Th, with Th/U ratios vary in the range of 0.32~0.87. Therefore, they are of magmatic origin. The new data change the traditional stratigraphic correlation of the Cangxi Complex-Group in northeastern Hunan. Therefore, the SHRIMP U-Pb dating of the metamorphic tuff from the Fengzichong Complex-Formation at the bottom of the Cangxi Complex-Group is of great significance in understanding of the tectonic framework of the “Jiangnan Orogenic Belt” in Hunan.
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