Constraints on the Genesis of the Qixiashan Pb-Zn Deposit, Nanjing: Evidence from Sulfide Trace Element Geochemistry

Xuejuan Sun; Pei Ni; Yulong Yang; Zhe Chi; Shan Jing

doi:10.1007/s12583-019-1270-5

Volume 31 Issue 2

Apr 2020

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Journal of Earth Science > 2020 > 31(2): 287-297.

Xuejuan Sun, Pei Ni, Yulong Yang, Zhe Chi, Shan Jing. Constraints on the Genesis of the Qixiashan Pb-Zn Deposit, Nanjing: Evidence from Sulfide Trace Element Geochemistry. Journal of Earth Science, 2020, 31(2): 287-297. doi: 10.1007/s12583-019-1270-5

Citation:

Xuejuan Sun, Pei Ni, Yulong Yang, Zhe Chi, Shan Jing. Constraints on the Genesis of the Qixiashan Pb-Zn Deposit, Nanjing: Evidence from Sulfide Trace Element Geochemistry. Journal of Earth Science, 2020, 31(2): 287-297. doi: 10.1007/s12583-019-1270-5

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Constraints on the Genesis of the Qixiashan Pb-Zn Deposit, Nanjing: Evidence from Sulfide Trace Element Geochemistry

doi: 10.1007/s12583-019-1270-5

Xuejuan Sun^{1,2
,},
Pei Ni^{1
,
,
,},
Yulong Yang³,
Zhe Chi¹,
Shan Jing²

1.
State Key Laboratory for Mineral Deposit Research, Institute of Geo-Fluids, School of Earth Science and Engineering, Nanjing University, Nanjing 210023, China
2.
East China Mineral Exploration and Development Bureau of Nonferrous Metal, Jiangsu Province, Nanjing 210007, China
3.
School of Geosciences, Chengdu University of Technology, Chengdu 610059, China

Funds:

the National Natural Science Foundation of China 1212011220678

More Information

Corresponding author: Pei Ni, peini@nju.edu.cn
Received Date: 13 Feb 2019
Accepted Date: 30 Oct 2019
Publish Date: 01 Feb 2020

Abstract

Abstract

The large-scale Qixiashan Pb-Zn Deposit in the eastern Middle-Lower Yangtze metallogenic belt is hosted in carbonate rocks. Based on a detailed mineral paragenesis study, in-situ LA-ICP-MS (laser ablation inductively coupled plasma mass spectrometer) trace element geochemistry data for pyrite and sphalerite from different stages in the Qixiashan Deposit are reported, the Pb-Zn mineralization processes are reconstructed, and a genetic model is constructed. Four paragenetic stages of Pb-Zn ore deposition are identified:the biogenic pyrite mineralization stage (Stage 1), the early stage of hydrothermal Pb-Zn mineralization (Stage 2), the late stage of hydrothermal Pb-Zn mineralization (Stage 3), and the carbonate stage (Stage 4). Stages 2 and 3 are the main ore stages. The trace element characteristics of the sulfide in stages 2 and 3, such as the higher Co/Ni and lower trace element contents of the pyrite and the Fe, Mn, and Ge contents of the sphalerite, indicate that they were generated by magmatic-hydrothermal processes. Furthermore, the lower Cu, Ag, Sb, and Pb contents of the pyrite and sphalerite of Stage 3 compared to Stage 2 suggest an increase in magmatic-hydrothermal activity from Stage 2 to Stage 3. The hydrothermal fluids leached trace elements (e.g., Cu, Ag, Sb, and Pb) from the previously deposited primary pyrite and sphalerite, which were precipitated in the later hydrothermal stage Cu, Au, Ag, Sb, and Pb bearing minerals and secondary pyrite and sphalerite with lower trace element contents (e.g., Cu, Au, Ag, Sb, and Pb). Compared with the pyrite from stages 2 and 3, the Stage 1 pyrite has relatively higher trace elements contents (Sb, Cu, Zn, Au, Ag, Pb, As, and Ni). However, their lower Co/Ni ratio suggests a syngenetic sedimentary origin. Based on the petrographic features and trace element data, a multi-stage mineralization model is proposed. The Stage 1 biogenic pyrite formed stratiform pyrite layers, which provided reducing conditions and a base for the subsequent Pb-Zn mineralization. During Stage 2, subsequent hydrothermal fluid interacted with the stratiform pyrite layers, which resulted in sulfide precipitation and the formation of stratiform Pb-Zn orebodies. In Stage 3, the hydrothermal fluid replaced the limestone along the fractures, which triggered the formation of Pb-Zn vein orebodies.
- sulfides,
- trace elements,
- superimposed mineralization,
- Qixiashan Pb-Zn Deposit

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References(52)

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