Trace element geochemistry of pyrite from the Jinzhuzhou gold deposit in the Dayaoshan district, Qin-Hang Metallogenic Belt (South China): Implications for the metallogenesis

YANG Chenyu; ZHANG Yu; WANG Xu; JIN Tingting; ZHAO Lianjie; SHEN Hongjie

doi:10.12097/gbc.2023.09.023

2025 Vol. 44, No. 2~3

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YANG Chenyu, ZHANG Yu, WANG Xu, JIN Tingting, ZHAO Lianjie, SHEN Hongjie. 2025. Trace element geochemistry of pyrite from the Jinzhuzhou gold deposit in the Dayaoshan district, Qin-Hang Metallogenic Belt (South China): Implications for the metallogenesis. Geological Bulletin of China, 44(2~3): 259-275. doi: 10.12097/gbc.2023.09.023

Citation:

YANG Chenyu, ZHANG Yu, WANG Xu, JIN Tingting, ZHAO Lianjie, SHEN Hongjie. 2025. Trace element geochemistry of pyrite from the Jinzhuzhou gold deposit in the Dayaoshan district, Qin-Hang Metallogenic Belt (South China): Implications for the metallogenesis. Geological Bulletin of China, 44(2~3): 259-275. doi: 10.12097/gbc.2023.09.023

Trace element geochemistry of pyrite from the Jinzhuzhou gold deposit in the Dayaoshan district, Qin-Hang Metallogenic Belt (South China): Implications for the metallogenesis

1.
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, Hunan, China
2.
School of Geosciences and Info-Physics, Central South University, Changsha 410083, Hunan, China
3.
Qinghai Provincial Geological Survey, Xining 810012, Qinghai, China

More Information

Corresponding author: ZHANG Yu, zyu2005@csu.edu.cn

Received Date: 18 September 2023

Revised Date: 03 February 2024

Publish Date: 15 March 2025

Abstract

Abstract

Objective
As an important part of the Qin−Hang Metallogenic Belt, the Dayaoshan district develops abundant gold deposits. However, due to the lack of effective constraints on the ore−forming process ore source the genesis of these deposits has always been controversial. The aim of this study is to provide constraints on the deposit genesis of regional gold deposits by taking the Jinzhuzhou gold deposit in the Dayaoshan district as the study object.
Methods
Pyrite is a common mineral in hydrothermal deposits, and its trace element geochemistry can play an important role in constraints on physicochemical conditions, ore−forming process and origin of deposits. In this paper, the internal structure and in situ trace element studies of Jinzhuzhou pyrite are carried out through field geological investigations, on the basis of fine dissection of the metallogenic process, and with the help of SEM, EPMA, LA−ICP−MS and other testing techniques.
Results
The Jinzhuzhou gold deposit is one of the typical gold deposits in this district, and characterized by the NS−trending ore−bearing quartz veins. Its mineralization can be divided into three stages: (Ⅰ) Quartz−sericite−pyrite−arsenopyrite stage; (Ⅱ) Quartz−native gold−polymetallic sulfide stage; (Ⅲ) Quartz−calcite−chlorite stage. Systematic back−scattering imaging observations revealed that the Stage Ⅰ pyrite (Py1) has developed a distinct core−mantle−rim texture, while the porous Stage Ⅱ pyrite (Py2) trapping some sulfide inclusions commonly replaces the mantle zone (Py1b) of Py1. In−situ LA−ICP−MS trace element analysis showed that the core zone (Py1c) of Py1 is enriched in Co, Ni, Se, and Bi. Py1b is commonly enriched in As and Au, while the rim zone of (Py1c) of Py1 is commonly depleted in trace elements. Generally, Py2 is characterized by the depletion of Au−As. Notably, the Co−Ni concentrations declines from Py1a, through Py1b, to Py1c, suggesting a gradual decreasing temperature, which may have been responsible for the core−mantle−rim texture of Py1. Moreover, the sharp and irregular contact boundary between Py2 and Py1b, abundant porosities and mineral inclusion of Py2, and the lower Au−As concentrations of Py2 than Py1b, indicate that Py2 may have been formed via dissolution and precipitation of Py1b. This process results in the remobilization of gold solid solution within Py1b and the further precipitation of visible gold in Stage Ⅱ.
Conclusions
Generally, the Jinzhuzhou pyrite is obviously enriched in Se (3.76 ~ 73.3×10⁻⁶, with an average of 16.5×10⁻⁶). Combining with the widespread development of magmatic−hydrothermal gold deposits, and the possible concealed magmatic pluton in the Dayaoshan district, it is inferred that the Jinzhuzhou gold deposit may have been magmatic hydrothermal origin.
- pyrite /
- trace element /
- ore-forming process /
- Jinzhuzhou gold deposit /
- Dayaoshan district /
- Guangxi

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References

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