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  5. Zn, Fe and S isotope fractionation in a large hydrothermal system
 
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Zn, Fe and S isotope fractionation in a large hydrothermal system

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Download Gagnevin et al. for UCD repository.pdfMain article22.04 MB
Download gagnevin et al. (2012) supplementary material.pdfSupplementary material40.75 KB
Author(s)
Gagnevin, Damien 
Boyce, Adrian 
Barrie, Craig 
Menuge, Julian 
Blakeman, Robert 
Uri
http://hdl.handle.net/10197/3869
Date Issued
01 July 2012
Date Available
16T13:44:12Z October 2012
Abstract
The genesis of hydrothermal ore deposits is of crucial economic importance. This study investigates the extent, causes and consequences of zinc and iron isotope fractionation in a large hydrothermal system at the world-class Navan Zn–Pb orebody, Ireland. Large variations in Zn, Fe and S isotope compositions have been measured in microdrilled sphalerite (ZnS) at the millimetre scale. d66Zn and d56Fe display a well-defined positive correlation and both also correlate with d34S. These relationships represent the combined effects of kinetic Zn and Fe isotope fractionation during sphalerite precipitation, and S isotope variation through mixing of hot, metal-rich hydrothermal fluids and cool, bacteriogenic sulfide-bearing brines. Combined with S isotope data, d56Fe and d66Zn data on mine concentrates confirm that hydrothermal sulfide is a minor component of the overall deposit signature. Our data suggest that incoming pulses of metal-rich hydrothermal fluid triggered sulfide mineralisation, and that rapid precipitation of sphalerite from hydrothermal fluids will lead to strong kinetic fractionation of Zn and Fe isotopes at very short time and length scales, thereby limiting the use of Fe and Zn isotopes as exploration tools within deposits, but revealing the possibility of detecting new deposits from isotopically heavy Zn–Fe geochemical halos.
Sponsorship
Science Foundation Ireland
Type of Material
Journal Article
Publisher
Elsevier
Journal
Geochimica et Cosmochimica Acta
Volume
88
Start Page
183
End Page
198
Copyright (Published Version)
2012 Elsevier Ltd
Keywords
  • Zn isotopes

  • Fe isotopes

  • S isotopes

  • Irish-type

  • Ireland

  • Zn-Pb

  • Hydrothermal

  • Ore

  • Carbonate-hosted

  • Base metal

Subject – LCSH
Zinc--Isotopes
Iron--Isotopes
Sulfur--Isotopes
Hydrothermal deposits--Ireland
DOI
10.1016/j.gca.2012.04.031
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
https://creativecommons.org/licenses/by-nc-sa/1.0/
Owning collection
Earth Sciences Research Collection
Scopus© citations
100
Acquisition Date
Jan 28, 2023
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