Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (2): 429-440.doi: 10.13278/j.cnki.jjuese.201502108

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Zircon LA-ICP-MS U-Pb Dating, Geochemistry of the Jibuhulengtu Garnet-Bearing Muscovite Granitic Pluton in Mongolia and Its Geological Significance

Li Fengxian1, Bai Xinhui2, Wan Le2, Guan Qingbin2, Li Pengchuan2   

  1. 1. Tianjin Institute of Geotechnical Investigation & Surveying, Tianjin 300191, China;
    2. College of Earth Sciences, Jilin University, Changchun 130061, China
  • Received:2014-09-15 Published:2015-03-26

Abstract:

There is a set of garnet-bearing muscovite granite in Bainaimiao island arc magmatic active belt that belongs to the northern part of the North China Craton. The Zircon LA-ICP-MS U-Pb dating yields weighted mean 206Pb/238U age of (500.8±2.4) Ma, indicating that the garnet-bearing muscovite granite was formed during the Late Cambrian. The petrogeochemistry is characterized by rich in Si,Al(w(SiO2)=72.50%-74.11%,w(Al2O3)=14.73%-16.43%)), poor in Fe, Mg and Ca (w(TFeO)=0.67%-1.14%,w(MgO)=0.09%,w(CaO)=0.30%-0.61%). The garnet-bearing muscovite granite is highly differentiated with its DI of 91.99-93.20,the Shand Indexes of the garnet-bearing muscovite granitesare higher than 1.1, typical for high aluminum minerals, like garnet and muscovite. They are not S-type granite, but highly differentiated-Calc alkaline granite. The petrogeochemistry of rare earth element is characterized by low REE with strong depletion of Eu, showing a tetrad REE pattern. Some samples are rich in Nb, Ta, which indicates that the pluton was formed by magma differentiation and magma-fluid interaction. This pluton provided the necessary material foundation for other rare metal mineralization, such as Nb, Ta.

Key words: granite, Zircon LA-ICP-MS U-Pb dating, geochemistry, REE tetrad pattern, highly differentiated

CLC Number: 

  • P581

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