Geochronology and Trace Element Compositions of Zircon in Granodiorite in North Baibandi Area, Western Bangong-Nujiang Metallogenic Belt and Their Geological Significance

XIANG Haoyu; LIU Song; KANG Bo; CHEN Changjun; DENG Wei; DENG Xiulin; CHEN Haoru

doi:10.12401/j.nwg.2023115

Northwestern Geology > 2025 > 58(1): 43-51. > DOI: 10.12401/j.nwg.2023115

XIANG Haoyu，LIU Song，KANG Bo，et al. Geochronology and Trace Element Compositions of Zircon in Granodiorite in North Baibandi Area, Western Bangong-Nujiang Metallogenic Belt and Their Geological Significance[J]. Northwestern Geology，2025，58（1）：43−51. doi: 10.12401/j.nwg.2023115

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Geochronology and Trace Element Compositions of Zircon in Granodiorite in North Baibandi Area, Western Bangong-Nujiang Metallogenic Belt and Their Geological Significance

1.
The 2nd Geological Brigade Of Sichuan, Chengdu 610041, Sichuan, China
2.
Sichuan Institute of Nuclear Geology Survey, Chengdu 610065, Sichuan, China
3.
Sichuan Branch of China National Geological Exploration Center of Building Materials Industry, Chengdu 610052, Sichuan, China
4.
China West Normal University, Nanyun 637009, Sichuan, China

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Received Date: September 11, 2022
Revised Date: April 16, 2023
Accepted Date: June 10, 2023
Available Online: December 18, 2024

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Abstract

Abstract

The granodiorite in the north of Baibandi is located in Gaize County, north of the Bangong Nujiang suture zone. The field geological survey shows that granodiorite intruded into the Permian Longge Formation carbonate. Skarn alteration and copper mineralization developed along the contact zone, showing good metallogenic potential. However, due to the absence of high-precision chronology research, the genesis of the granodiorite remains poorly understanding. In this paper, the LA-ICP-MS zircon U-Pb geochronology and trace element studies were carried out on for zircon from the granodiorite in the north of Baibandi area in order to determining the age and analyzing the metallogenic potential. The results show that zircons from the granodiorite in the north of Baibandi area are all magmatic zircons. 17 zircons show weighted average ²⁰⁶Pb/²⁰⁸U ages of (154.8 ± 1.2) Ma (MSWD=1.7), showing that the granodiorite was formed in the Late Jurassic. The ƩREE values zircon of are 6.1×10⁻⁶～24.04 ×10⁻⁶ (averaging 11.68 ×10⁻⁶). The ƩLREEs and ƩHREEs values are 0.41×10⁻⁶～9.44×10⁻⁶ and 4.93×10⁻⁶～23.55×10⁻⁶, respectively, showing the enrichment of heavy rare earths. The δ_Eu and δ_Ce values of zircons range from 0.26 to 0.64 and 0.91 to 5.03 respectively, showing significant negative Eu anomalies and positive Ce anomalies. The Ti contents of zircon range from 0.89×10⁻⁶ to 1.43×10⁻⁶, with estimated crystallization temperature of 600.3 to 799.3 ℃ (averaging 697.6 ℃). Based on these results and the characteristics of regional tectonic evolution, it is inferred that the granodiorite in the north of Baibandi was formed during northward subduction of Bangong-Nujiang oceanic crust. Our results provide new evidence for understanding the formation of the Bangong-Nujiang metallogenic belt.
- zircon U-Pb age,
- granodiorite,
- trace element compositions of zircon,
- Bangong-Nujiang metallogenetic belt

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References (39)

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Geochronology and Trace Element Compositions of Zircon in Granodiorite in North Baibandi Area, Western Bangong-Nujiang Metallogenic Belt and Their Geological Significance