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LIU Wei, LI Fen-qi, YUAN Si-hua, ZHANG Wan-ping, WANG Bao-di, ZHUO Jie-wen, CHEN Lu, CHEN Li. 2011: Zircon LA-ICP-MS U-Pb age of Early Cretaceous ignimbrite in southern Nagqu, Tibet. Geological Bulletin of China, 30(7): 1043-1049. DOI: 10.12097/gbc.20110706
Citation: LIU Wei, LI Fen-qi, YUAN Si-hua, ZHANG Wan-ping, WANG Bao-di, ZHUO Jie-wen, CHEN Lu, CHEN Li. 2011: Zircon LA-ICP-MS U-Pb age of Early Cretaceous ignimbrite in southern Nagqu, Tibet. Geological Bulletin of China, 30(7): 1043-1049. DOI: 10.12097/gbc.20110706
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Zircon LA-ICP-MS U-Pb age of Early Cretaceous ignimbrite in southern Nagqu, Tibet

  • Chengdu Center, China Geological Survey, Chengdu 610081, Sichuan, China;2. Graduate School of Chinese Academy of Geological Sciences ,Beijing 100037, China;3. School of Earth Sciences and Resources ,China University of Geosciences, Beijing 100083, China;4. State Key Laboratory of Geological Processes and Mineral Resources/China University of Geosciences,Wuhan 430074, Hubei, China

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  • In northern Gangdise belt, Middle Triassic, Middle-Late Jurassic and Late Cretaceous magmatic activities exist, but Early Cretaceous magmatic activity was rarely reported. The authors sampled and analyzed systematically andesite porphyrite from Luoma area of Nagqu, Tibet. Two of the samples were dated by LA-ICP-MS zircon U-Pb dating, and their ages are 116.1±0.4Ma and 115.9±0.5Ma respectively. These ages are almost consistent with each other within the acceptable error range, thus representing the formation age. The authors hold that the Early Cretaceous magmatic activity did exist in northern Gangdise belt, which is of great significance in the study of the Early Cretaceous geological evolution.
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