Genetic Mineralogy and Geological Significance of Gold Minerals and Gold-bearing Pyrites from the Xinli Gold Deposit in the Jiaodong Area

ZHANG Ran; XIAO Zhibin; FU Chao; FU Shixing; ZHU Zhaoming

doi:10.15898/j.cnki.11-2131/td.202111260189

Rock and Mineral Analysis > 2022 > 41(6): 997-1006. > DOI: 10.15898/j.cnki.11-2131/td.202111260189

ZHANG Ran, XIAO Zhibin, FU Chao, FU Shixing, ZHU Zhaoming. Genetic Mineralogy and Geological Significance of Gold Minerals and Gold-bearing Pyrites from the Xinli Gold Deposit in the Jiaodong Area[J]. Rock and Mineral Analysis, 2022, 41(6): 997-1006. DOI: 10.15898/j.cnki.11-2131/td.202111260189

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Genetic Mineralogy and Geological Significance of Gold Minerals and Gold-bearing Pyrites from the Xinli Gold Deposit in the Jiaodong Area

1.
Tianjin Center, China Geological Survey, Tianjin 300170, China
2.
Geological Exploration Institute of Shandong Zhengyuan, China Metallurgical Geology Bereau, Jinan 250101, China

More Information

Received Date: November 25, 2021
Revised Date: March 06, 2022
Accepted Date: March 13, 2022
Available Online: December 13, 2022

Abstract

HIGHLIGHTS
(1) The mineralogical characteristics of gold minerals and gold-bearing pyrites from the Xinli gold deposit in the Jiaodong area were studied using electron probe microanalysis.

(2) The vast majority of gold deposits are electrum deposits, and gold-bearing pyrites are mostly tetrahedral and pentagonal dodecahedral.

(3) The third stage of the hydrothermal period of the Xinli gold deposit is the main mineralization stage, the hydrothermal solution in this stage has the characteristics of medium hypabyssal and medium-low temperature.

ABSTRACT

BACKGROUND
In Shandong Province, northwest of the Jiaodong area is the most important gold metallogenic area. The Xinli gold deposit is not only an important deposit in the Sanshandao-Xinli metallogenic belt, but also one of the most typical gold deposits in this area. Research on the Xinli gold mine has been carried out for years and has achieved many fruitful results, however, the mineralogical characteristics and mineral typomorphic characteristics of gold minerals and gold-bearing minerals still need to be studied further.
OBJECTIVES
To investigate the mineralogical characteristics and geological significance of gold minerals and gold-bearing pyrites from the Xinli gold deposit.
METHODS
Polarized light microscope identification and electron probe microanalysis were the main methods in the research of gold minerals and gold-bearing minerals. The geological significance was explored through mineral typological characteristics.
RESULTS
The results show that most of the gold minerals in the Xinli gold deposit are electrum, a small amount of native gold and kustelite. The gold fineness ranges from 336.2 to 834.9, with an average of 699.8. The content of S in gold-bearing pyrite is 51.69%-53.78%, with an average of 53.19%; Fe content is 45.69%-47.62%, with an average of 46.52%; The S/Fe value is 1.99, and sulfur is depleted slightly.
CONCLUSIONS
The morphological typomorphism of gold-bearing pyrites shows an evolutionary trend from coarse-grained cubic shape to medium- and fine- grained pentagonal-dodecahedral shape and then to fine-grained cubic shape, which reflects the gradual reduction of hydrothermal fluid temperature in different metallogenic stages. The compositional typomorphic characteristics indicate that the ore-forming hydrothermal solution has typical characteristics of medium hypabyssal and medium-low temperature. Therefore, it is considered that there are three stages of mineralization in the hydrothermal alteration period of the Xinli gold deposit, of which the third stage is the main mineralization period.
- Xinli gold deposit,
- electron probe microanalyzer,
- gold minerals,
- gold-bearing pyrites,
- genetic mineralogy

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References (40)

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