Petrogeochemistry, chronology, Sr-Nd-Pb isotopic compositions, and geological significance of the ore-causative intrusion in the Langdu skarn deposit, northwest Yunnan

MO Lei; SHEN Qiwu; CHEN Xilian; WU Lianrong; ZHANG Chuanyu; DONG Qiaofeng; SU Xiaoyu; SHI Baosheng; YU Haijun; LENG Chengbiao

doi:10.19826/j.cnki.1009-3850.2023.11004

2024 Vol. 44, No. 2

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MO Lei, SHEN Qiwu, CHEN Xilian, WU Lianrong, ZHANG Chuanyu, DONG Qiaofeng, SU Xiaoyu, SHI Baosheng, YU Haijun, LENG Chengbiao. 2024. Petrogeochemistry, chronology, Sr-Nd-Pb isotopic compositions, and geological significance of the ore-causative intrusion in the Langdu skarn deposit, northwest Yunnan. Sedimentary Geology and Tethyan Geology, 44(2): 421-436. doi: 10.19826/j.cnki.1009-3850.2023.11004

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MO Lei, SHEN Qiwu, CHEN Xilian, WU Lianrong, ZHANG Chuanyu, DONG Qiaofeng, SU Xiaoyu, SHI Baosheng, YU Haijun, LENG Chengbiao. 2024. Petrogeochemistry, chronology, Sr-Nd-Pb isotopic compositions, and geological significance of the ore-causative intrusion in the Langdu skarn deposit, northwest Yunnan. Sedimentary Geology and Tethyan Geology, 44(2): 421-436. doi: 10.19826/j.cnki.1009-3850.2023.11004

Petrogeochemistry, chronology, Sr-Nd-Pb isotopic compositions, and geological significance of the ore-causative intrusion in the Langdu skarn deposit, northwest Yunnan

1.
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
2.
Yunnan Diqing Nonferrous Metal Co., Ltd., Shangri-La 674400, China
3.
Yunnan Geological Survey, Kunming 650216, China
4.
Yunnan Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization, Kunming 650051, China
5.
Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization, MNR, Kunming 650051, China

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Corresponding author: SHEN Qiwu, 1423229078@qq.com

Received Date: 03 April 2023

Revised Date: 30 June 2023

Accepted Date: 01 August 2023

Publish Date: 30 June 2024

Abstract

Abstract

The Langdu intrusion in northwestern Yunnan is located in the Zhongdian arc of the southern Yidun terrane and it belongs to the ore-causative intrusion of Langdu skarn-type copper deposit, spatially. This study focuses on the quartz-diorite porphyry within the Langdu ore-bearing intrusion and investigates its zircon SIMS U-Pb dating, rock geochemistry, and Sr-Nd-Pb isotopic composition. The zircon U-Pb dating results reveal a crystallization age of 219.2±1.8 Ma (2σ, MSWD=1.3, n=13) for the Langdu quartz-diorite porphyry, which is consistent with the late Triassic intrusive rocks in the Zhongdian arc. The Langdu quartz-diorite porphyry exhibits medium SiO₂ (60.42%–66.44%), high Al₂O₃ (14.56%–16%), and high K₂O (3.49%–4.49%) contents. It is characterized by enrichment of LREE and large ion lithophile elements such as Rb, Ba, and Sr, and relative depletion of HREE and high field strength elements such as Ta, Nb, and Ti, belonging to the high-K calc-alkaline series. Additionally, the initial ⁸⁷Sr/⁸⁶Sr ratios of the Langdu quartz-diorite porphyry range from 0.7054 to 0.7061, and ε_Nd(t) values range from －3.5 to －2.5. All samples are plotted near the orogenic evolution line on the Pb isotope evolutionary diagram. Combining the petrological, geochemical, and isotopic characteristics of the Langdu quartz-diorite porphyry, this study suggests that the Langdu ore-bearing intrusion formed in relation to the westward subduction and accretion of late Triassic Garez-Litang oceanic crust. It was a product of partial melting of the metasomatized mantle, mixed with lower crustal material during its ascent, and experienced intense fractional crystallization. The high Sr/Y and high V/Sc ratios of the Langdu quartz-diorite porphyry indicate the characteristics of high-water content and relatively high oxygen fugacity in the magma, which are probably key factors controlling the formation of the porphyry-skarn copper deposit in this region.
- Langdu /
- ore-bearing intrusion /
- rock geochemistry /
- zircon U-Pb age /
- Sr-Nd-Pb isotopes

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