Magmatic evolution of the Hongchuan Cu-Ni sulfide deposit, western North Qilian Orogenic Belt: Insights from whole-rock geochemistry and zircon Hf isotopes

LI Linna; JIAO Jiangang; SHEN Qingjie; ZHAO Guobin; XU Mingchi; GUO Junhua; WANG Jiaxin

doi:10.12097/gbc.2024.02.021

2025 Vol. 44, No. 5

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LI Linna, JIAO Jiangang, SHEN Qingjie, ZHAO Guobin, XU Mingchi, GUO Junhua, WANG Jiaxin. 2025. Magmatic evolution of the Hongchuan Cu-Ni sulfide deposit, western North Qilian Orogenic Belt: Insights from whole-rock geochemistry and zircon Hf isotopes. Geological Bulletin of China, 44(5): 885-901. doi: 10.12097/gbc.2024.02.021

Citation:

LI Linna, JIAO Jiangang, SHEN Qingjie, ZHAO Guobin, XU Mingchi, GUO Junhua, WANG Jiaxin. 2025. Magmatic evolution of the Hongchuan Cu-Ni sulfide deposit, western North Qilian Orogenic Belt: Insights from whole-rock geochemistry and zircon Hf isotopes. Geological Bulletin of China, 44(5): 885-901. doi: 10.12097/gbc.2024.02.021

Magmatic evolution of the Hongchuan Cu-Ni sulfide deposit, western North Qilian Orogenic Belt: Insights from whole-rock geochemistry and zircon Hf isotopes

1.
School of Earth Science and Resources, Chang’an University, Xi’an 710054, Shaanxi, China
2.
Key Laboratory for the study of Focused Magmatism and Giant Ore Deposits, MNR, Xi’an Center of Geological Survey, China Geological Survey, Xi’an 710054, Shaanxi, China
3.
Key Laboratory of Western China’s Mineral Resources and Geological Engineering, Ministry of Education, Xi’an 710054, Shaanxi, China
4.
Xi’an Key Laboratory for Mineralization and Efficient Utilization of Critical Metals, Xi’an 710054, Shaanxi, China
5.
Fourth Institute of Geological and Mineral Exploration of Gansu Provincial Bureau of Geology and Mineral Resources Jiuquan 735000, Gansu, China
6.
Key Laboratory of Mineral Resources Exploration, Jiuquan 735000, Gansu, China

More Information

Corresponding author: JIAO Jiangang, jiangang@chd.edu.cn

Received Date: 28 February 2024

Revised Date: 18 May 2024

Publish Date: 15 May 2025

Abstract

Abstract

Objective
The recent discovery of the Hongchuan Cu−Ni deposit in the North Qilian Orogenic Belt represents a significant breakthrough in mineral exploration. Uncertainties in the formation age, petrogenesis, and magmatic source of the ore−bearing intrusions hinder a comprehensive understanding of the deposit′s mineralization mechanisms.
Methods
Therefore, this study integrates petrological, whole−rock geochemical, zircon U−Pb geochronological, and Hf isotopic analyses to characterize these intrusions.
Results
The ore−bearing rock in the Hongchuan Cu−Ni deposit predominantly comprises strongly serpentinized peridotite and biotite amphibolite, and the main ore−bearing lithology is strongly serpentinized peridotite. Geochemical analyses reveal features, including low SiO₂(39.13%~46.35%) and high MgO(13.69%~27.47%) contents, high Mg^# values (68.28~79.91). The distribution curve of rare earth elements shows flat characteristics, and trace elements Nb, P, and Ti are deficient. Zircon U−Pb dating, conducted via LA−ICP−MS on zircons from the plagioclase−bearing peridotite, yielded a weighted mean ²⁰⁶Pb/²³⁸U age of 486.9 ± 5.9 Ma, with zircon ε_Hf(t) values ranging from −0.19 to 7.12.
Conclusions
Integrating geological data with regional geological context suggests a genesis within an island arc environment. The magma source is proposed to have originated from a depleted mantle that was influenced by fluid alteration and subduction processes, with less than 10% contamination of lower crustal materials during magma emplacement.
- chronology /
- petrogenesis /
- Cu-Ni sulfide deposits /
- Hongchuan mafic-ultramafic intrusions /
- North Qilian Orogenic Belt

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References

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