九嶷山复式岩体成因

张博; 许金梅; 林寿洪; 李斌; 张乾; 刘湘华; 刘超云; 赖健清

doi:10.3799/dqkx.2025.225

Volume 51 Issue 2

Feb. 2026

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Article Navigation > Earth Science > 2026 > 51(2): 513-526

Zhang Bo, Xu Jinmei, Lin Shouhong, Li Bin, Zhang Qian, Liu Xianghua, Liu Chaoyun, Lai Jiangqing, 2026. Petrogenesis of the Jiushishan Composite Pluton in South China. Earth Science, 51(2): 513-526. doi: 10.3799/dqkx.2025.225

Citation:

Zhang Bo, Xu Jinmei, Lin Shouhong, Li Bin, Zhang Qian, Liu Xianghua, Liu Chaoyun, Lai Jiangqing, 2026. Petrogenesis of the Jiushishan Composite Pluton in South China. Earth Science, 51(2): 513-526. doi: 10.3799/dqkx.2025.225

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Petrogenesis of the Jiushishan Composite Pluton in South China

doi: 10.3799/dqkx.2025.225

Zhang Bo^{1, 2
,
,},
Xu Jinmei^{1, 2},
Lin Shouhong²,
Li Bin^{1, 2, 5
,
,
,},
Zhang Qian²,
Liu Xianghua^{1, 3, 4},
Liu Chaoyun¹,
Lai Jiangqing¹

1.
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Ministry of Education), School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
2.
Zijing Mining, Shanghang 361008, China
3.
School of Civil Engineering and Architecture, Guangxi Minzu University, Nanning 530006, China
4.
Geophysical and Geochemical Survey Institute of Hunan Province, Changsha 410014, China
5.
School of New Energy and Mining, Xinjiang University of Technology, Hetian 878000, China

Received Date: 2025-02-23
Publish Date: 2026-02-25

Abstract

Abstract

The Mesozoic composite plutons widely distributed in South China are closely associated with rare metal mineralization. However, their genetic mechanisms remain highly debated. To constrain the petrogenetic model of such intrusions, this study focuses on the Jiuyishan composite pluton in southern Hunan, employing integrated whole-rock geochemistry, zircon U-Pb geochronology, and in situ Hf isotopic analysis. Zircon U-Pb dating yields weighted mean ages of 153.0±1.0 Ma, 153.1±0.9 Ma, and 153.8±1.5 Ma for the Shaziling, Jinjiling, and Pangxiemu plutons, respectively, indicating their emplacement during the early Yanshanian period. Whole-rock Sr-Nd and zircon Hf isotopic compositions suggest that these rocks were derived primarily from partial melting of ancient lower crust with minor mantle input, and are classified as A₂-type granites formed in an intraplate extensional setting. Based on Rayleigh fractionation modeling of the whole-rock Rb-Sr system, we propose a multi-stage crystallization differentiation model: initial crystal mush underwent melt extraction at 40%-50% crystallinity, with the residual cumulates forming the Shaziling pluton, while the extracted melt subsequently migrated and experienced further differentiation, eventually emplacing as the Jinjiling and Pangxiemu plutons. This model provides new constraints on the magmatic evolution of Mesozoic composite plutons in South China and their implications for rare metal enrichment.
- Jiuyishan composite pluton,
- zircon,
- rayleigh fractionation modeling,
- crystal mush model,
- geochemistry

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References(38)

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