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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 Fan; Chaoyi Xiao; Hanjie Wen; Lin Ye; Zhilong Huang; Jiaxi Zhou; Qingjun Guo
2019
发表期刊Acta Geochimica
卷号38期号:5页码:642-653
摘要

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 delta~(66)Zn and delta~(34)S values in sphalerite from the Wusihe deposit increase systematically from the bottom to the top of the strata-bound orebodies. Such spatial evolution in delta~(66)Zn and delta~(34)S 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.

关键词Sichuan-yunnan-guizhou Wusihe Zn-pb Deposit Zn-s Isotopes Fe-cd Contents Two-source Fluids
收录类别EI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/10171
专题矿床地球化学国家重点实验室
作者单位1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.School of Resource Environment and Earth Sciences, Yunnan University, Kunming 650504, China
4.Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
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GB/T 7714
Hongjie Zhang,Haifeng Fan,Chaoyi Xiao,et al. The mixing of multi-source fluids in the Wusihe Zn-Pb ore deposit in Sichuan Province, Southwestern China[J]. Acta Geochimica,2019,38(5):642-653.
APA Hongjie Zhang.,Haifeng Fan.,Chaoyi Xiao.,Hanjie Wen.,Lin Ye.,...&Qingjun Guo.(2019).The mixing of multi-source fluids in the Wusihe Zn-Pb ore deposit in Sichuan Province, Southwestern China.Acta Geochimica,38(5),642-653.
MLA Hongjie Zhang,et al."The mixing of multi-source fluids in the Wusihe Zn-Pb ore deposit in Sichuan Province, Southwestern China".Acta Geochimica 38.5(2019):642-653.
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