Ore Texture from Longhua Nickel-cobalt Deposit in Jinxiu, Guangxi: Implication for the Genesis of the Deposit

YANG Qi-Di; HUANG Xiao-Kun; LI Kun; LIU Fei; ZHAOWu-Qiang; ZHOU Yun; DAI Ping-Yun

doi:10.3969/j.issn.2097-0013.2023.04.002

2023 Vol. 39, No. 4

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Article navigation > South China Geology > 2023 > 39(4): 601-616

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YANG Qi-Di, HUANG Xiao-Kun, LI Kun, LIU Fei, ZHAOWu-Qiang, ZHOU Yun, DAI Ping-Yun. 2023. Ore Texture from Longhua Nickel-cobalt Deposit in Jinxiu, Guangxi: Implication for the Genesis of the Deposit. South China Geology, 39(4): 601-616. doi: 10.3969/j.issn.2097-0013.2023.04.002

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YANG Qi-Di, HUANG Xiao-Kun, LI Kun, LIU Fei, ZHAOWu-Qiang, ZHOU Yun, DAI Ping-Yun. 2023. Ore Texture from Longhua Nickel-cobalt Deposit in Jinxiu, Guangxi: Implication for the Genesis of the Deposit. South China Geology, 39(4): 601-616. doi: 10.3969/j.issn.2097-0013.2023.04.002

Ore Texture from Longhua Nickel-cobalt Deposit in Jinxiu, Guangxi: Implication for the Genesis of the Deposit

1.Wuhan Center, China Geological Survey (Geosciences Innovation Center of Central South China),Wuhan 430205, Hubei, China
2. Research Center for Petrogenesis and Mineralization of Granitoid Rocks, China Geological Survey,Wuhan 430205, Hubei, China

More Information

Corresponding author: LI Kun

Received Date: 31 August 2023

Revised Date: 31 October 2023

Abstract

Abstract

Longhua nickel-cobalt mine in Jinxiu, Guangxi Province, was a newly discovered high-grade nickel-cobalt deposit in China in recent years，ore body of which is mainly controlled by the surrounding rocks and east-west fault, but the genesis is still highly controversial. Based on the first observation of the "fern-like zonal texture" which is common in five-element vein deposits, this paper compares and analyzes the critical aspects of source of metallogenic material, the source and nature of mineralization fluids, and the precipitation mechanism between the Longhua nickel-cobalt deposit and five-element vein deposits, and proposes that genetic type of the Longhua nickel-cobalt deposit may be a five-element vein deposit. The metallogenic material came from Cambrian strata, the mineralization fluid was dominated by basin brine and superimposed on meteoric water precipitation. The black carbonaceous mudstone-siltstone was the reducing barrier that triggered the precipitation of ore-forming materials, and the inflow of primary pyrite and CH₄-containing reduc ing fluids was the direct factor leading to the sedimentation of nickeline and other relevant ore-forming materials. In particular, the formation of the symbolic "fern-like ring structure" may be the result of the slower thermochemical reduction of sulfate than arsenite in the fluids under specific pH conditions.
- Ni-Co deposit /
- Five-element vein deposit /
- Arsenide /
- Sulfarsenide /
- Nickeline

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References

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