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LIU Zhicheng, ZHENG Mengtian, GUO Yuheng, DUAN Wei, ZHOU Yong, LIU Bo, TANG Wenchun. Geochemical Characteristics and MetallogenicAge of the Maoping Graphite Deposit in the Panxi Area, Southern Sichuan[J]. Multipurpose Utilization of Mineral Resources, 2024, 45(1): 73-84. doi: 10.3969/j.issn.1000-6532.2024.01.009
Citation: LIU Zhicheng, ZHENG Mengtian, GUO Yuheng, DUAN Wei, ZHOU Yong, LIU Bo, TANG Wenchun. Geochemical Characteristics and MetallogenicAge of the Maoping Graphite Deposit in the Panxi Area, Southern Sichuan[J]. Multipurpose Utilization of Mineral Resources, 2024, 45(1): 73-84. doi: 10.3969/j.issn.1000-6532.2024.01.009
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Geochemical Characteristics and MetallogenicAge of the Maoping Graphite Deposit in the Panxi Area, Southern Sichuan

  • 1.

    Sichuan Insitute of Land Science and Technology, Chengdu 610045, Sichuan, China

  • 2.

    Geochemistry Exploration Brigade of Sichuan Bureau of Exploration and Development of Geology and Minerals Resources, Deyang 618000, Sichuan, China

  • 3.

    NO.605 Geological Party, Sichuan Bureau of Metallurgical Geology and Exploration, Meishan 620800, Sichuan, China

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Received Date:  19 December 2022
Publish Date:  25 February 2024
    Abstract

  • This is an article in the field of earth sciences. The newly discovered Maoping graphite deposit is a super-large crystalline graphite deposit that is located in the middle-northern section of the Kang-Dian fault-uplift belt on the western margin of the Upper Yangtze paleo-continent, and the research on the source of mineralization and its mineralization age is relatively weak. The orebodies occur in the epimetamorphic rocks of Mesoproterozoic Tianbaoshan Formation. In this paper, the geochemical characteristics of major ores, trace amounts and rare earth elements were mainly studied. The results show that the original rock of the ore-bearing rock layer is parametamorphic rock, a set of carbonaceous quartz-bearing siltstone, which is deposited in an oxygen-deficient environment. The characteristics of trace elements indicate that the original rock of the ore body is formed by the deposition of offshore terrigenous clasts. The ores show sedimentary characteristics of coastal tidal flat facies, with an average ΣREE of 158 g/t, average δ Ce value of 0.63 (weak negative anomaly), and an average δ Eu value of 0.69 (negative abnormaly). The graphite ore body has a δ13C value of -28.35‰～-29.08‰, with an average of -28.59‰, indicating that the mineralized carbon is dominated by organic carbon. The LA-MC-ICP-MS Zircon U-Pb of amphibole zircon from Xijie hornblende diorite Zircon is (823.4±3.6) Ma, which is later than the formation era of volcanic rocks of the Tianbaoshan Formation (954 Ma), representing the time of superposition metamorphism of graphite. In summary,the genetic type of the ore deposit is sedimentary- metamorphism and its metamorphism may include the regional dynamic metamorphism of Jinning period that is superimposed by contact metamorphism.

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