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    Volume 48 Issue 9
    Sep.  2023
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    Article Contents
    Wu Junhua, Gong Min, Zhou Xuegui, Wang Chuan, Yang Ziwen, Luo Qing, Li Yanjun, 2023. Geochronology and Sources of the Giant Xiaokeng Kaolin Deposit in Southern Jiangxi Province: Insight from U-Pb Ages of Zircon and Monazite, and Hf Isotopic Compositions. Earth Science, 48(9): 3245-3257. doi: 10.3799/dqkx.2022.118
    Citation: Wu Junhua, Gong Min, Zhou Xuegui, Wang Chuan, Yang Ziwen, Luo Qing, Li Yanjun, 2023. Geochronology and Sources of the Giant Xiaokeng Kaolin Deposit in Southern Jiangxi Province: Insight from U-Pb Ages of Zircon and Monazite, and Hf Isotopic Compositions. Earth Science, 48(9): 3245-3257. doi: 10.3799/dqkx.2022.118

    Geochronology and Sources of the Giant Xiaokeng Kaolin Deposit in Southern Jiangxi Province: Insight from U-Pb Ages of Zircon and Monazite, and Hf Isotopic Compositions

    doi: 10.3799/dqkx.2022.118
    • Received Date: 2022-02-23
      Available Online: 2023-10-07
    • Publish Date: 2023-09-25
    • Weathering-type kaolin deposits are widespread in South China, and they are associated with the intense intermediate-acid magmatism of granitic rocks and dikes. Ore-related magmatism were dominantly formed during the Caledonian and Yanshanian. However, no Kaolin mineralization associated with Triassic magmatism has been reported in South China so far. The Xiaokeng kaolin deposit, which has been discovered and explored recently, is a giant deposit with mineral resources more than 30 Mt in southern Jiangxi Province. The kaolin ore-bodies distribute on the surface of a muscovite granite as stratoid or crescent in shapes. It is a weathering-type kaolin deposit associated with granite and is characterized by low contents of iron and titanium. In this paper, the U-Pb laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) dating of zircon and monazite, and Lu-Hf isotopes of zircon on kaolin ore are documented, in order to study the age and magmatic sources of ore-related granite. Mean ages of 231±2 to 230±2 Ma were obtained for two samples of zircon with intercept ages of 232±5 to 231±3 Ma. Based on micro-textures, and contents and ratios of trace and rare earth elements, a magmatic origin was proposed for monazite from kaolin ore at Xiaokeng. A yielded age of 230±1 Ma was obtained using U-Pb dating at monazite grains. These ages indicate that the ore-related granite was formed during the Late Triassic. Late Triassic zircon grains have εHf(t) values ranging from -19.9 to -1.2 with two-stages Hf model ages (TDM2) of 2 228-1 198 Ma. These Hf isotopic values, together with the presence of two Meso- to Neoproterozoic inherited zircon grains (1 018-987 Ma), indicate that the ore-related granite in the Xiaokeng deposit was originated from partial melting of Meso- to Neoproterozoic basement beneath South China, with minor contribution of mantle sources. This study on ages and sources of kaolin ore at Xiaokeng, not only suggests that Late Triassic tourmaline bearing muscovite or two-mica granites in South China can form high-quality weathering-type kaolin, but also expands the prospecting direction of kaolin deposits.

       

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