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    中国百强科技报刊

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    Volume 44 Issue 1
    Jan.  2019
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    Article Navigation >  Earth Science  > 2019  >  44(1): 123-134
    Li Kaiwen, Fang Huaibin, Guo Jungong, Liu Kun, Zhao Huan, Wang Xiaojuan, 2019. Petrogeochemistry, Zircon U-Pb Dating and Geological Significance of Two-Mica Granites from Wuduoshan Granite in Nanzhao County, Eastern Qinling Mountains. Earth Science, 44(1): 123-134. doi: 10.3799/dqkx.2018.306
    Citation: Li Kaiwen, Fang Huaibin, Guo Jungong, Liu Kun, Zhao Huan, Wang Xiaojuan, 2019. Petrogeochemistry, Zircon U-Pb Dating and Geological Significance of Two-Mica Granites from Wuduoshan Granite in Nanzhao County, Eastern Qinling Mountains. Earth Science, 44(1): 123-134. doi: 10.3799/dqkx.2018.306
    shu

    Petrogeochemistry, Zircon U-Pb Dating and Geological Significance of Two-Mica Granites from Wuduoshan Granite in Nanzhao County, Eastern Qinling Mountains

    doi: 10.3799/dqkx.2018.306
    • 1.

      Henan Institute of Geological Survey, Zhengzhou 450001, China

    • 2.

      Henan Key Laboratory for Metal Mineral Ore-Forming Geological Process and Utilization of Resource, Zhengzhou 450001, China

    • 3.

      Henan Geological Science Research Institute, Zhengzhou 450001, China

    • Received Date: 2018-06-13
    • Publish Date: 2019-01-15
      Abstract
    • The Qinling orogenic belt, located in the suture zone of the North China Plate and the Yangtze Plate, has undergone a complicated tectonic evolution process however, its plate combination mechanism and collision time limit have been controversial. In this study, petrogeochemistry analyses and LA-ICP-MS zircon U-Pb dating are undertaken for the two-mica granites from Wuduoshan in Nanzhao County, eastern Qinling mountains. Results show that the two-mica granites have SiO2=69.32%-74.28%, Al2O3=14.14%-17.28%, Na2O+K2O=7.68%-9.03%, and belong chemically to peraluminous series of S type. Meanwhile, the two-mica granites have a moderate amount of rare earth elements, with medium fractionation characteristics between light rare earth elements and heavy rare earth elements and medium negative Eu anomalies. The trace elements diagram shows enrichment of large ion lithophile elements (LILEs) and depletion of Ba, Nb, Sr, P and Ti, indicating that the two-mica granites may have been formed in the thickened crust caused by the collision between continents. Zircons from the two-mica granites in this study display fine-scale oscillatory growth and high ratios of Th/U (> 0.4), indicating a magmatic origin. The dating of the two-mica granites yields a LA-ICP-MS zircon U-Pb age of 433±2 Ma. Combined with constructional environment, it is concluded that it was transformed from plate subduction to continental collision in the Nanzhao County at late of Early Silurian.

       

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