Monazite U-Pb age, geochemistry, and genesis of ore-bearing granites in the Zhukeng tungsten deposit, southern Jiangxi Province

GAO Yuan; WANG Ying; WANG Hai; XU Zhe; ZHANG Yong; ZHOU Yu; ZHANG Fangrong; SUN Chao; HE Bin; ZHANG Siyuan; ZHANG Fushen

doi:10.12090/j.issn.1006-6616.2024083

Volume 31 Issue 2

Apr. 2025

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Article Navigation > Journal of Geomechanics > 2025 > 31(2): 325-339

GAO Y，WANG Y，WANG H，et al.，2025. Monazite U-Pb age, geochemistry, and genesis of ore-bearing granites in the Zhukeng tungsten deposit, southern Jiangxi Province[J]. Journal of Geomechanics，31（2）：325−339 doi: 10.12090/j.issn.1006-6616.2024083

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Monazite U-Pb age, geochemistry, and genesis of ore-bearing granites in the Zhukeng tungsten deposit, southern Jiangxi Province

doi: 10.12090/j.issn.1006-6616.2024083

GAO Yuan^{1, 2},
WANG Ying^{3, 4},
WANG Hai^{2, 3
,
,},
XU Zhe^{1, 2},
ZHANG Yong³,
ZHOU Yu^{1, 2, 3},
ZHANG Fangrong^{1, 2},
SUN Chao^{1, 2},
HE Bin^{1, 2},
ZHANG Siyuan³,
ZHANG Fushen^{1, 2}

1.
Institute of Basic Geological Survey, Jiangxi Geological Survey and Exploration Institute, Nanchang 330030, Jiangxi, China
2.
Jiangxi Province Key Laboratory of Exploration and Development of Critical Mineral Resources, Nanchang 330009, Jiangxi, China
3.
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China
4.
Institute of Geomechanics, China Academy of Geological Sciences, Beijing 10081, China

Funds: This research is financially supported by the Open Fund Project of the State Key Laboratory of Nuclear Resources and Environment of East China University of Technology (Grant No. 2022NRE09), the Open Fund Project of Jiangxi Province Key Laboratory of Exploration and Development of Critical Mineral Resources (Grant No. GHKC2024KF08), the Open Fund Project of the Fundamental Science on Radioactive Geology and Exploration Technology Laboratory (Grant No. 2022RGET08), the National Natural Science Foundation of China (Grant No. 42062006), the Jiangxi Provincial Natural Science Foundation (Grant No. 20232BAB213065), the Jiangxi Provincial Geological Bureau of Science and Technology Research Project (Grant No. 2022JXDZKJKY02), the Jiangxi Province's Science−Technology and Geology Joint Project (Grant No. 2023KDG01003) and the Training Program for the Young Talents in Science and Technology from the Jiangxi Provincial Bureau of Geology (Grant No. 2022JXDZKJRC04).

More Information

Received: 2024-08-06
Revised: 2025-02-26
Accepted: 2025-02-27

Available Online: 2025-02-28

Published: 2025-04-27

Abstract

Abstract

Objective The composite Zhukeng granite is composed of two-mica granite and muscovite granite and closely related to tungsten and niobium-tantalum deposits in southern Jiangxi Province. Methods Based on systematic lithogeochemical analysis and rock-forming age determination of muscovite granite and two-mica granite from the Zhukeng tungsten deposit, combined with regional studies concerning diagenesis and mineralization, the genesis and tectonic setting of the rock mass are discussed. Result The LA-ICP-MS analysis of monazite from the fine-grained muscovite granite yielded a ²⁰⁶Pb/²³⁸U weighted average U-Pb age of 156.7 ± 1.3 Ma. Major elements exhibit high silica contents (SiO₂ ranging from 65.54% to 74.95%), high alkalis contents (Na₂O+K₂O ranging from 8.48% to 12.85%), high aluminum contents (A/CNK ratios ranging from1.10 to 1.22), and low magnesium contents. The total rare earth elements (ΣREE) range from 61.12×10⁻⁶ to 173.98×10⁻⁶, and there are right-dipping light rare earth enrichment patterns with a weak negative Eu anomalies. The trace elements Rb, Ta, Th, Pb, Nd, and Hf are enriched, while Ba, Nb, Sr, and Ti are depleted, indicating a highly differentiated S-type granite. The LA-ICP-MS analysis of monazite U-Pb from the two-mica granite yielded an ²⁰⁶Pb/²³⁸U weighted average age of 159.5 ± 0.5 Ma. Major elements exhibit high silica contents (SiO₂ ranging from 75.02% to 77.03%), high alkalis contents (Na₂O+K₂O ranging from 5.92% to 8.58%), high aluminum contents (A/CNK ranging from 1.14 to 1.65), and low magnesium contents. Total rare earth elements (ΣREE) range from 106.86×10⁻⁶ to 124.24×10⁻⁶, and there are right-dipping light rare earth enrichment patterns with a significant negative Eu anomalies. The trace elements Rb, Ta, Th, Pb, Nd, and Hf are enriched, while Ba, Nb, Sr, and Ti are depleted, suggesting a highly differentiated S-type granite. Conclusion By combining geochronological and lithogeochemical characteristics, the authors conclude that the Zhukeng tungsten deposit formed during an Upper Jurassic mineralization event caused by large-scale granitic magmatic activity related to subduction.
- southern Jiangxi Province,
- Zhukeng pluton,
- granite type tungsten deposit,
- monazite U-Pb dating,
- geochemistry

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