SHRIMP zircon U-Pb ages and tectonic implications for Indosinian granitoids of southern Zhuguangshan granitic composite, South China

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• 作者：Ping Deng (1) (2)
  JiShun Ren (1)
  HongFei Ling (3)
  WeiZhou Shen (3)
  LiQiang Sun (3)
  Ba Zhu (4)
  ZhengZhong Tan (4)
  
• 关键词：granites ; SHRIMP zircon U ; Pb dating ; early Indosinian period ; southern Zhuguangshan
• 刊名：Chinese Science Bulletin
• 出版年：2012
• 出版时间：May 2012
• 年：2012
• 卷：57
• 期：13
• 页码：1542-1552
• 全文大小：1387KB
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• 作者单位：Ping Deng (1) (2)
  JiShun Ren (1)
  HongFei Ling (3)
  WeiZhou Shen (3)
  LiQiang Sun (3)
  Ba Zhu (4)
  ZhengZhong Tan (4)
  
  1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China
  2. Uranium Resources Limited Company, China Guangdong Nuclear Power Holding Corporation, Beijing, 100029, China
  3. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210093, China
  4. Research Institute No. 290, China National Nuclear Corporation, Shaoguan, 512026, China
  
• ISSN：1861-9541

文摘

The large southern Zhuguangshan granitic batholith composite consists of granites with ages varying from the Caledonian through Indosinian to Yanshanian. Based on K-Ar dating data, the ages of the major parts of this composite were previously regarded as Yanshanian. In this study, the SHRIMP zircon U-Pb dating method has been adopted for six plutons, Ledong, Longhuashan, Dawozi, Zhaidi, Baiyun and Jiangnan, in the southern Zhuguangshan composite, in which the four plutons other than Baiyun and Jiangnan were previously regarded as Yanshanian granites. Magmatic zircons from these six plutons, dated by this study, have yielded ages of 239±5 Ma (MSWD = 2.5), 239±5 Ma (MSWD = 2.5), 239±2 Ma (MSWD = 1.7), 239±4 Ma (MSWD = 3.2), 231±2 Ma (MSWD = 0.81) and 231±3 Ma (MSWD = 1.8), respectively. The results indicate that these plutons were formed by early Indosinian magmatism. Geochemical characteristics suggest that these granites were formed in an extensional tectonic environment. Therefore, the Indosinian period granites in the southern Zhuguangshan composite were formed by partial melting of the Paleo-Mesoproterozoic crustal components during the collapse of thickened lithosphere after the collision between the South China and Indosinian plates.