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The mixing of multi-source fluids in the Wusihe Zn–Pb ore deposit in Sichuan Province, Southwestern China

  • Hongjie Zhang
  • Haifeng FanEmail author
  • Chaoyi Xiao
  • Hanjie Wen
  • Lin Ye
  • Zhilong Huang
  • Jiaxi Zhou
  • Qingjun Guo
Original Article
  • 9 Downloads

Abstract

The Sichuan–Yunnan–Guizhou (SYG) metallogenic province of southwest China is one of the most important Zn–Pb ore zones in China, with ~ 200 Mt Zn–Pb ores at mean grades of 10 wt.% Zn and 5 wt.% Pb. The source and mechanism of the regional Zn–Pb mineralization remain controversial despite many investigations that have been conducted. The Wusihe Zn–Pb deposit is a representative large-scale Zn–Pb deposit in the northern SYG, which mainly occurs in the Dengying Formation and yields Zn–Pb resources of ~ 3.7 Mt. In this paper, Zn and S isotopes, and Fe and Cd contents of sphalerite from the Wusihe deposit were investigated in an attempt to constrain the controls on Zn and S isotopic variations, the potential sources of ore-forming components, and the possible mineralization mechanisms. Both the δ66Zn and δ34S values in sphalerite from the Wusihe deposit increase systematically from the bottom to the top of the strata-bound orebodies. Such spatial evolution in δ66Zn and δ34S values of sphalerite can be attributed to isotopic Rayleigh fractionation during sphalerite precipitation with temperature variations. The strong correlations between the Zn–S isotopic compositions and Fe–Cd concentrations in sphalerite suggest that their variations were dominated by a similar mechanism. However, the Rayleigh fractionation mechanism cannot explain the spatial variations of Fe and Cd concentrations of sphalerite in this deposit. It is noted that the bottom and top sphalerites from the strata-bound orebodies document contrasting Zn and S isotopic compositions which correspond to the Zn and S isotopic characteristics of basement rocks and host rocks, respectively. Therefore, the mixing of two-source fluids with distinct Zn–S isotopic signatures was responsible for the spatial variations of Zn–S isotopic compositions of sphalerite from the Wusihe deposit. The fluids from basement rocks are characterized by relatively lighter Zn (~ 0.2 ‰) and S (~ 5 ‰) isotopic compositions while the fluids from host rocks are marked by relatively heavier Zn (~ 0.6 ‰) and S (~ 15 ‰) isotopic compositions.

Keywords

Sichuan–Yunnan–Guizhou Wusihe Zn–Pb deposit Zn–S isotopes Fe–Cd contents Two-source fluids 

Notes

Acknowledgements

This project was funded by the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (XDB18030302), the National Key R&D Program of China (2017YFC0602503), the National Natural Science Foundation of China (U1812402, 41430315, 41573011, 41625006). We give thanks to the two reviewers for reviewing the manuscript and the editor for providing comments and editorial reversions.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

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Copyright information

© Science Press and Institute of Geochemistry, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Ore Deposit GeochemistryInstitute of Geochemistry, Chinese Academy of SciencesGuiyangChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.School of Resource Environment and Earth SciencesYunnan UniversityKunmingChina
  4. 4.Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina

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