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

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dc.contributor.author Gagnevin, Damien
dc.contributor.author Boyce, Adrian
dc.contributor.author Barrie, Craig
dc.contributor.author Menuge, Julian
dc.contributor.author Blakeman, Robert
dc.date.accessioned 2012-10-16T13:44:12Z
dc.date.available 2012-10-16T13:44:12Z
dc.date.copyright 2012 Elsevier Ltd en
dc.date.issued 2012-07-01
dc.identifier.citation Geochimica et Cosmochimica Acta en
dc.identifier.uri http://hdl.handle.net/10197/3869
dc.description.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. en
dc.description.sponsorship Science Foundation Ireland en
dc.language.iso en en
dc.publisher Elsevier en
dc.relation.requires Earth Institute Research Collection en
dc.rights This is the author’s version of a work that was accepted for publication in Geochimica et Cosmochimica Acta. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Geochimica et Cosmochimica Acta (Volume 88, 1 July 2012, Pages 183–198) DOI:10.1016/j.gca.2012.04.031 Elsevier Ltd. en
dc.subject Zn isotopes en
dc.subject Fe isotopes en
dc.subject S isotopes en
dc.subject Irish-type en
dc.subject Ireland en
dc.subject Zn-Pb en
dc.subject Hydrothermal en
dc.subject Ore en
dc.subject Carbonate-hosted en
dc.subject Base metal en
dc.subject.lcsh Zinc--Isotopes en
dc.subject.lcsh Iron--Isotopes en
dc.subject.lcsh Sulfur--Isotopes en
dc.subject.lcsh Hydrothermal deposits--Ireland en
dc.title Zn, Fe and S isotope fractionation in a large hydrothermal system en
dc.type Journal Article en
dc.internal.availability Full text available en
dc.status Peer reviewed en
dc.identifier.volume 88 en
dc.identifier.startpage 183 en
dc.identifier.endpage 198 en
dc.identifier.doi 10.1016/j.gca.2012.04.031
dc.neeo.contributor Gagnevin|Damien|aut|
dc.neeo.contributor Boyce|Adrian|aut|
dc.neeo.contributor Barrie|Craig|aut|
dc.neeo.contributor Menuge|Julian|aut|
dc.neeo.contributor Blakeman|Robert|aut|
dc.description.admin DG 16/10/2012 en

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