Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (5): 1505-1517.doi: 10.13278/j.cnki.jjuese.20190297

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Zircon U-Pb Chronology, Geochemistry and Geological Significance of Coarse Muscovite Granite in Pingmiao Mining Area of Dahutang, North Jiangxi

Yu Zhendong, Xiang Xinkui, Tan Rong, Sun Deming, Zhang Si   

  1. No. 916 Geological Party, Jiangxi Bureau of Geology&Mineral Exploration, Jiujiang 332100, Jiangxi, China
  • Received:2019-12-22 Online:2020-09-26 Published:2020-09-29
  • Supported by:
    Supported by Project of China Geological Survey (121201004000150017-13)

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Abstract: Dahutang tungsten-copper polymetallic ore concentration area in north Jiangxi is located in the southeastern margin of Yangtze plate and the middle part of Jiangnan orogenic belt, which is one of the world-class tungsten deposits discovered in recent years. In this research, the petrographic, zircon U-Pb chronology, geochemistry and mineralization of coarse muscovite granites in Pingmiao ore of Dahutang were studied. The results show that the muscovite in the granites is a primary muscovite, and the zircon U-Pb age of LA-ICP-MS is (145.7±0.6)Ma, closed to the test age of fine biotite granite in this area, which is the result of crystallization differentiation of homologous magma evolution, and the magmatic intrusion of the second stage of the Yanshanian multiple stages. The Yanshanian rock units are porphyritic-like biotite (muscovite) granite →biotite granite, muscovite granite→granite porphyry;of them, the muscovite granite is one of the important metallogenic geological bodies in this area. The geochemical study shows that the muscovite granite is highly differentiated S-type granite, with high SiO2=73.14%-74.19%, rich-alkali, per-aluminous characteristics,and high differentiation index. The fractionation of light and heavy rare earth is obvious, in deep V-shaped with high left and low right, strong loss of Eu, and REE quadruple grouping effect. The average values of Rb/Sr and Rb/Ba are 151.81 and 245.21 respectively, indicating that the magma is the result of multi-stage crystallization and high differentiation.

Key words: Dahutang, muscovite granite, zircon U-Pb chronology, geochemistry

CLC Number: 

  • P59
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