Zircon U-Pb SHRIMP dating for the volcanic rocks of the Xiong’er Group: Constraints on the initial formation age of the cover of the North China Craton

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• 作者：Taiping Zhao (1)
  Mingguo Zhai (2)
  Bin Xia (1)
  Huimin Li (3)
  Yixing Zhang (4)
  Yusheng Wan (5)
  
• 关键词：Xiong’er Group ; volcanic rocks ; zircon U ; Pb SHRIMP age ; Proterozoic ; North China Craton
• 刊名：Chinese Science Bulletin
• 出版年：2004
• 出版时间：December 2004
• 年：2004
• 卷：49
• 期：23
• 页码：2495-2502
• 全文大小：937KB
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• 作者单位：Taiping Zhao (1)
  Mingguo Zhai (2)
  Bin Xia (1)
  Huimin Li (3)
  Yixing Zhang (4)
  Yusheng Wan (5)
  
  1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640, Guangzhou, China
  2. Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029, Beijing, China
  3. Tianjin Institute of Geology and Resource, 300170, Tianjin, China
  4. Geological Survey of Henan Province, 467021, Pingdingshan, China
  5. Institute of Geology, Chinese Academy of Geological Sciences, 100037, Beijing, China
  
• ISSN：1861-9541

文摘

The volcanic rocks of the Xiong’er Group occur widely in the southern part of the North China Craton, which mark the beginning of the cover in the southern part of the North China Craton. The age of the volcanic rocks is thus crucial to understand the tectonic regime and evolutionary history of the North China Craton in the Proterozoic age. Zircons from five volcanic rocks and intrusions were dated by U-Pb SHRIMP method. The results indicate that the Xiong’er Group formed in 1.80-1.75 Ga of Paleo-Proterozoic. Since the Xiong’er Group formed earlier than the Changcheng System, the earliest rocks in the Changcheng System is therefore assumed to be formed in 1.75 Ga. A thermal-tectonic event of ca. 1.84 Ga is indicated by new zircon U-Pb SHRIMP ages in the southern part of the North China Craton. The volcanic rocks of the Xiong’er Group thus represent the initial magmatism of the Paleo-Proterozoic breakup of the North China Craton. Numerous inherited zircons in the volcanic rocks mainly formed in ?.20 Ga, indicating that the source magma of the volcanic rocks may be derived from the ?.20 Ga crust, or from a mantle magma with significant contamination of the ?.20 Ga crust.