LA−ICP−MS trace element analysis of pyrite from Jiaodingshan cobalt deposits in Sichuan，and its constraints on the ore genesis

WU Wenhui; ZHAN Hanyu; QIN Yulong; ZHANG Tong; XIONG Changli; XU Yunfeng

doi:10.12097/gbc.2022.12.021

2024 Vol. 43, No. 7

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Article navigation > Geological Bulletin of China > 2024 > 43(7): 1090-1103

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WU Wenhui, ZHAN Hanyu, QIN Yulong, ZHANG Tong, XIONG Changli, XU Yunfeng. 2024. LA−ICP−MS trace element analysis of pyrite from Jiaodingshan cobalt deposits in Sichuan，and its constraints on the ore genesis. Geological Bulletin of China, 43(7): 1090-1103. doi: 10.12097/gbc.2022.12.021

Citation:

WU Wenhui, ZHAN Hanyu, QIN Yulong, ZHANG Tong, XIONG Changli, XU Yunfeng. 2024. LA−ICP−MS trace element analysis of pyrite from Jiaodingshan cobalt deposits in Sichuan，and its constraints on the ore genesis. Geological Bulletin of China, 43(7): 1090-1103. doi: 10.12097/gbc.2022.12.021

LA−ICP−MS trace element analysis of pyrite from Jiaodingshan cobalt deposits in Sichuan，and its constraints on the ore genesis

1.
Sichuan Institute of Comprehensive Geological Survey, Chengdu 610081, Sichuan, China
2.
Key Laboratory of Sichuan Province for Strategic Resources Evaluation and Utilization of Rare Metals and Earths, Chengdu 610081, Sichuan, China

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Corresponding author: ZHANG Tong, 986573254@qq.com

Received Date: 23 December 2022

Revised Date: 21 February 2023

Publish Date: 15 July 2024

Abstract

Abstract

The Jiaodingshan cobalt deposit is situated in the southwestern of Sichuan basin, and the source of the ore materials and fluids is still under debated. Cobalt is enriched in vulcanized species because of its double properties of iron and sulfur affinity. In order to analyse the genesis of the deposit, this study investigates the pyrite microstructure and the geochemical compositions of pyrite based on LA−ICP−MS. The results show that three generations of pyrite were identified according to its microstructure characteristics in Jiaodingshan cobalt deposit. The first generation (pyrite Ⅰ)is identified as original sedimentary pyrite, including colloform pyrite, subhedral pyrite and framboidal pyrite. The pyrite Ⅰ is characterized by low Co/ Ni ratio (<1 and the average ratio is 0.53) and low Co content (99.8 × 10⁻⁶). Due to the influence of tectonic deformation and hydrothermal superimposition, the pyrite Ⅱ often presents the structure with metasomatic relict texture(pyrite Ⅱ−a) and recrystallization(pyrite Ⅱ−b), which is characterized by high Co/ Ni ratios (Co/ Ni >1, the average ratios is 1.31) and middle Co content (1060.8 × 10⁻⁶). Pyrite Ⅲ exists in the form of fine sand−like and fine colloidal aggregates, along with strong metal luster. Such pyrite is often associated with linnaeite, siegenite and chalcopyrite, with the ratios of Co/ Ni higher than 1(the average ratios is 2.05) and the Co content being 10453.5×10⁻⁶. The Co and Ni contents in Py Ⅲ perhaps represented by siegenite inclusions enclosed in pyrite. Overall, the early sedimentary pyrite I with high ore−forming element background value may be affected by tectonic deformation−hydrothermal superposition transformation in the later period, resulting in further enrichment of ore−forming elements (Co) in pyrite Ⅱ. While the main ore−forming period of Py Ⅲ was hydrothermal superimposed on Py Ⅱ, and finally formed the existing cobalt deposit.
- LA−ICP−MS /
- pyrite /
- trace element /
- cobalt deposit /
- Jiaodingshan, Sichuan Province

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