| 4.1 Ga old detrital zircon in western Tibet of China |
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| 作者姓名： | DUO Ji WEN ChunQi GUO JianCi FAN XiaoPing LI XiaoWen |
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| 作者单位： | [1]Tibet Bureau of Geology and Mineral Exploration and Development, Lhasa 850000, China [2]Chengdu University of Technology, Chengdu 610059, China |
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| 基金项目： | Supported by National 973 Project (Grant No.2002CB412600) and the National Natural Science Foundation of China (Grant No.40472058) |
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| 摘 要： | 4.1 Ga old detrital zircon was found by SHRIMP U-Pb dating for quartz schist from Buring County in western Tibet, Southwest China. This is the oldest zircon U-Pb age found in China so far. The detrital zircon is a zircon of magmatic origin because its Th/ U ratios are 0.76 to 0.86. Two dates older than 4.0 Ga were measured only in one grain. U-Pb ages of 35 measured spots in 24 zircons can be subdivided into 6 groups, corresponding to at least 6 episodes of magmatic activity in the target area. The present results provide an important geochronological constraint on the geological evolution of Qinghai-Tibet Plateau.
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| 关 键 词： | 锆石 中国 西藏 地层 |
| 收稿时间： | 3 July 2006 |
| 修稿时间： | 2006-07-032006-09-25 |
4.1 Ga old detrital zircon in western Tibet of China |
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| DUO Ji WEN ChunQi GUO JianCi FAN XiaoPing LI XiaoWen.4.1 Ga old detrital zircon in western Tibet of China[J].Chinese Science Bulletin,2007,52(1):23-26. |
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| Authors: | Duo Ji Wen ChunQi Guo JianCi Fan XiaoPing Li XiaoWen |
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| Institution: | (1) Tibet Bureau of Geology and Mineral Exploration and Development, Lhasa, 850000, China;(2) Chengdu University of Technology, Chengdu, 610059, China |
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| Abstract: | 4.1 Ga old detrital zircon was found by SHRIMP U-Pb dating for quartz schist from Buring County in western Tibet, Southwest China. This is the oldest zircon U-Pb age found in China so far. The detrital zircon is a zircon of magmatic origin because its Th/ U ratios are 0.76 to 0.86. Two dates older than 4.0 Ga were measured only in one grain. U-Pb ages of 35 measured spots in 24 zircons can be subdivided into 6 groups, corresponding to at least 6 episodes of magmatic activity in the target area. The present results provide an important geochronological constraint on the geological evolution of Qinghai-Tibet Plateau. |
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| Keywords: | SHRIMP U-Pb dating detrital zircon 4 1 Ga China |
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