Zircon SHRIMP U-Pb dating and geochemical characteristics of late variscan granites of the daitongshan copper deposit and lamahanshan polymetallic-silver deposit, southern Daxing’anling, China

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• 作者：Zhenhua Zhou 周振华 (1)
  Boyang Li 李泊洋 (2)
  Aishun Wang 王挨顺 (3)
  Xinli Wu 武新丽 (4)
  Hegen Ouyang 欧阳荷根 (4)
  Jiarui Feng 冯佳睿 (5)
  
• 关键词：SHRIMP U ; Pb dating ; geochemistry ; Variscan ; Daitongshan copper deposit ; Lamahanshan silver polymetallic deposit ; Daxing’anling
• 刊名：Journal of Earth Science
• 出版年：2013
• 出版时间：October 2013
• 年：2013
• 卷：24
• 期：5
• 页码：772-795
• 全文大小：
• 作者单位：Zhenhua Zhou 周振华 (1)
  Boyang Li 李泊洋 (2)
  Aishun Wang 王挨顺 (3)
  Xinli Wu 武新丽 (4)
  Hegen Ouyang 欧阳荷根 (4)
  Jiarui Feng 冯佳睿 (5)
  
  1. MRL Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037, China
  2. No. 10 Institute of Geological Exploration, Inner Mongolia Bureau of Geology & Mineral Resources, Chifeng, 024005, China
  3. Geological Survey Institute of Inner Mongolia, Hohhot, 010020, China
  4. School of Earth Science and Mineral Resources, China University of Geosciences, Beijing, 100083, China
  5. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, 100083, China
  
• ISSN：1867-111X

文摘

Daxing’anling(大兴安岭) area is one of the regions that Phanerozoic granites are extremely developed in NW China. At present, the Hercynian granitoid research lags behind the Mesozoic granitoid research. In this article, we have taken systematic petrochemistry and geochronology researches on the Hercynian granitoids in Daitongshan(代铜山) copper deposit and Lamahanshan(喇嘛罕山) silver polymetallic deposit, which were located at southern section of Daxing’anling metallogenic belt. Zircon SHRIMP U-Pb dating results show that, the granite aplites in Daitongshan and the gneissic granites in Lamahanshan were formed at (265±5)-(268±9) Ma and (252±2)-(252.6±3.4) Ma, respectively, which were both the products of late Herynian tectonic-magmatic events. Samples from Lamahanshan are characterized by high SiO2 (69.72 wt.%-74.65 wt.%), high potassium (3.53 wt.%-4.55 wt.%) and low P2O5 (0.03 wt.%-0.12 wt.%), aluminum saturation index (A/CNK) range from 0.95 to 0.98, Rb, Nd and K are enriched, whereas the elements such as Nb, Ta, P and Ti are depleted, which belong to I-type granitoids. Characteristics of samples from Daitongshan are similar to H-type granitoids. The magma source may be mostly originated from the lithospheric mantle component which were transformated or affected by the subduction components, and its formation may be closely related with the subduction and orogenesis of the Paleo-Asian Ocean.