长江中下游地区武山中酸性岩石Li-Sr-Nd同位素及地球化学

李壮; 陈长健; 陈斌

doi:10.3799/dqkx.2023.008

Volume 49 Issue 7

Jul. 2024

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Article Navigation > Earth Science > 2024 > 49(7): 2475-2489

Li Zhuang, Chen Changjian, Chen Bin, 2024. Li-Sr-Nd Isotopes and Geochemistry of Wushan Intermediate-Acidic Magmatic Rocks in Middle-Lower Yangtze River Region. Earth Science, 49(7): 2475-2489. doi: 10.3799/dqkx.2023.008

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Li Zhuang, Chen Changjian, Chen Bin, 2024. Li-Sr-Nd Isotopes and Geochemistry of Wushan Intermediate-Acidic Magmatic Rocks in Middle-Lower Yangtze River Region. Earth Science, 49(7): 2475-2489. doi: 10.3799/dqkx.2023.008

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Li-Sr-Nd Isotopes and Geochemistry of Wushan Intermediate-Acidic Magmatic Rocks in Middle-Lower Yangtze River Region

doi: 10.3799/dqkx.2023.008

Li Zhuang^{1
,
,},
Chen Changjian^{2
,
,},
Chen Bin³

1.
College of Geosciences, China University of Petroleum, Beijing 102249, China
2.
Gemological Institute, Guilin University of Technology, Guilin 541004, China
3.
Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518055, China

Received Date: 2022-09-04
Available Online: 2024-08-03
Publish Date: 2024-07-25

Abstract

Abstract

To provide important insights into the petrogenesis of the Early Cretaceous intermediate-acidic magmatic rocks in middle-lower Yangtze River region, it carried out a detailed investigation of Li-Sr-Nd isotopes and geochemistry for the Wushan granodiorite porphyry, quartz diorite porphyry and the basic dyke. The Wushan granodiorite porphyry samples are characterized by the high concentrations of SiO₂, MgO, and K₂O and low concentration of Na₂O, respectively, enrichment in LREEs and LILEs, and relative depletion in Y and Yb. They exhibit isotopic values of (⁸⁷Sr/⁸⁶Sr)_i=0.703 0-0.707 4, ε_Nd(t)=-5.1--4.6, and δ⁷Li=+0.9‰-+3.2‰, respectively, which are between the isotopic values of crustal and mantle end-members, revealing a crust-mantle mixing process between felsic melts from a juvenile lower crust and mafic melts from an enriched mantle source. They were subsequently subjected to weakly fractional crystallization of pyroxene and hornblende and minor crustal contamination during the ascent and emplacement. The Early Cretaceous intermediate-acidic magmatic rocks and related deposits in middle-lower Yangtze River region could be related to upwelling of asthenospheric mantle caused by the subduction of the Paleo-Pacific plate and its induced reactivation of sub-continental lithosphere.
- middle-lower Yangtze River region,
- Wushan,
- intermediate-acidic magmatic rock,
- geochemistry,
- Li-Sr-Nd isotope

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References(44)

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