Volume 46 Issue 11
Nov.  2021
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Shao Hang, Wang Junpeng, Xiao Deng, 2021. Mineral Chemistry of Biotite and Its Petrogenesis Implications in Fangshan Granite, Beijing. Earth Science, 46(11): 4006-4016. doi: 10.3799/dqkx.2021.029
Citation: Shao Hang, Wang Junpeng, Xiao Deng, 2021. Mineral Chemistry of Biotite and Its Petrogenesis Implications in Fangshan Granite, Beijing. Earth Science, 46(11): 4006-4016. doi: 10.3799/dqkx.2021.029

Mineral Chemistry of Biotite and Its Petrogenesis Implications in Fangshan Granite, Beijing

doi: 10.3799/dqkx.2021.029
  • Received Date: 2021-01-23
    Available Online: 2021-12-04
  • Publish Date: 2021-11-30
  • The Fangshan granite is located in the Yanshan tectonic belt of the North China craton, and is an asymmetric annular intrusive body. It is mainly composed of multi-stage intrusive granodiorites which are divided into three lithofacies belts including central facies, transitional facies and marginal facies. In addition, there are a lot of mafic microgranular enclaves (MMEs) distributed within the pluton. Biotite is one of the main minerals in intermediate acid igneous rocks, and its mineral geochemical characteristics record the properties of host magma and the physical and chemical conditions of petrogenesis. In this study, the biotite in the granite and MMEs was systematically observed. The chemical composition of biotite was studied in detail by electron probe microanalysis (EPMA). Finally, the magma source and mixing process of the Fangshan granite are discussed. The results show that the biotite in the granite and the MMEs have similar chemical compositions. The biotite in the granite is rich in Mg and poor in Fe, which belongs to magnesian biotite. The iron content coefficients[(Fe3++Fe2+)/(Fe3++Fe2++Mg2+)] of granite in three facies zones from the outside to the inside are 0.42-0.47, 0.45-0.47 and 0.41-0.46, respectively. The FeOT/MgO ratio is close to 0.60. The MF values[2×Mg/(Fe2++Mg+Mn)] are 1.05-1.21, 1.06-1.15 and 1.12-1.23, indicating the source material were derived from crust-mantle mixed rocks. The biotite's MF values of MMEs in three lithofacies belts from the outside to the inside are 1.00-1.16, 1.03-1.15 and 1.10-1.18. The biotite is magnesia biotite, suggesting that primitive magma was influenced by intermediate-acid magma. The above results show that biotite from both the granite and MMEs has similar chemical characteristics. However, there are some differences among different lithofacies. Therefore, it speculates that magma mixing has occurred in the Fangshan granite. The magma mixing is a multi-stage interaction process and may be caused by the mantle-derived magma which is injected into the crustal-derived acid magma during multiple stages.

     

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