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

Gagnevin, D.; Boyce, Adrian J.; Barrie, Craig D.; Menuge, Julian F.; Blakeman, Robert J.

doi:10.1016/j.gca.2012.04.031

Cited by 119 publications

(60 citation statements)

References 64 publications

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“…By analyzing sphalerites from ore deposits, Mason et al (2005), Wilkinson et al (2005), Kelley et al (2009), Gagnevin et al (2012 and Zhou et al (2014) observed Zn isotope variations of about 1.5 ‰. These studies indicate that early precipitated sphalerites have higher 64 Zn-values than late precipitates.…”

Section: Ore Depositsmentioning

confidence: 95%

“…The variations have been related to kinetic fractionations during rapid sphalerite precipitation. Gagnevin et al (2012) explained relatively large Zn-isotope variations at the millimetre scale by mixing of hot hydrothermal fluids with cool brines containing bacterial sulfide. John et al (2008) reported relatively large Zn isotope fractionation in hydrothermal vent fluids.…”

Section: Ore Depositsmentioning

confidence: 99%

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Isotope Fractionation Processes of Selected Elements

Hoefs

2015

Stable Isotope Geochemistry

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Section: Ore Depositsmentioning

confidence: 95%

Section: Ore Depositsmentioning

confidence: 99%

Isotope Fractionation Processes of Selected Elements

Hoefs

2015

Stable Isotope Geochemistry

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“…Zn [126] and references therein, [130,132,133] Less data than for Cu-isotopes. Evidence for modest fractionation during evolution of hydrothermal fluids Ge [134] and references therein, [135] Ge concentrated in sphalerite; potential for tracing processes in seafloor hydrothermal systems.…”

Section: Non-traditional Stable Isotopesmentioning

confidence: 99%

Advances and Opportunities in Ore Mineralogy

et al. 2017

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Abstract:The study of ore minerals is rapidly transforming due to an explosion of new microand nano-analytical technologies. These advanced microbeam techniques can expose the physical and chemical character of ore minerals at ever-better spatial resolution and analytical precision. The insights that can be obtained from ten of today's most important, or emerging, techniques and methodologies are reviewed: laser-ablation inductively-coupled plasma mass spectrometry; focussed ion beam-scanning electron microscopy; high-angle annular dark field scanning transmission electron microscopy; electron back-scatter diffraction; synchrotron X-ray fluorescence mapping; automated mineral analysis (Quantitative Evaluation of Mineralogy via Scanning Electron Microscopy and Mineral Liberation Analysis); nanoscale secondary ion mass spectrometry; atom probe tomography; radioisotope geochronology using ore minerals; and, non-traditional stable isotopes. Many of these technical advances cut across conceptual boundaries between mineralogy and geochemistry and require an in-depth knowledge of the material that is being analysed. These technological advances are accompanied by changing approaches to ore mineralogy: the increased focus on trace element distributions; the challenges offered by nanoscale characterisation; and the recognition of the critical petrogenetic information in gangue minerals, and, thus the need to for a holistic approach to the characterization of mineral assemblages. Using original examples, with an emphasis on iron oxide-copper-gold deposits, we show how increased analytical capabilities, particularly imaging and chemical mapping at the nanoscale, offer the potential to resolve outstanding questions in ore mineralogy. Broad regional or deposit-scale genetic models can be validated or refuted by careful analysis at the smallest scales of observation. As the volume of information at different scales of observation expands, the level of complexity that is revealed will increase, in turn generating additional research questions. Topics that are likely to be a focus of breakthrough research over the coming decades include, understanding atomic-scale distributions of metals and the role of nanoparticles, as well how minerals adapt, at the lattice-scale, to changing physicochemical conditions. Most importantly, the complementary use of advanced microbeam techniques allows for information of different types and levels of quantification on the same materials to be correlated.

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“…However, pyrite is enriched in light S isotopes compared with sphalerite, possibly because sphalerite is preferentially enriched in heavy S isotopes. Studies of the Navan magmatichydrothermal Pb-Zn deposit in Ireland indicated a temperature of the ore-forming fluid of 150 to 170 ∘ C. During rapid sphalerite deposition, because of kinetic fractionation, the sphalerite is enriched in light 56 Fe (−1.2‰) and 66 Zn (−0.15‰), and the two values display a very high positive correlation [84].…”

Section: Factors Controlling the Fe Isotopicmentioning

confidence: 99%

“…Previous studies of the Navan Pb-Zn deposit in Ireland indicated that the range of 56 Fe values of sphalerite is approximately from −2.2‰ to −0.2‰, and the Fe and Zn isotopes exhibit a very high positive correlation. The formation of iron sulfide in hydrothermal fluids is typically rapid and thus often causes kinetic fractionation, indicating that the kinetic fractionation of Fe and Zn isotopes during the formation of sphalerite causes the enrichment in light Fe and Zn isotopes [84].…”

Section: Deposition Of Hydrothermal Sulfidesmentioning

confidence: 99%

Fe Isotopic Compositions of Modern Seafloor Hydrothermal Systems and Their Influence Factors

Wang

2017

Journal of Chemistry

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Based on previous research on the Fe isotope compositions of various components and systems of the Earth, this study focused on the Fe isotope compositions of hydrothermal systems, including the Fe isotope variations in chalcopyrite, pyrite, and sphalerite, and their possible controlling factors. The main findings are as follows: (1) 56 Fe values of pyrite/marcasite display a larger range than those of chalcopyrite. This pattern is directly related to equilibrium fractionation or kinetic fractionation of Fe isotopes during the deposition of sulfides. To better understand the Fe isotope compositions of modern seafloor hydrothermal systems, the geochemical behavior and fractionation mechanisms of Fe isotopes require further in situ study.

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

Cited by 119 publications

References 64 publications

Isotope Fractionation Processes of Selected Elements

Isotope Fractionation Processes of Selected Elements

Advances and Opportunities in Ore Mineralogy

Fe Isotopic Compositions of Modern Seafloor Hydrothermal Systems and Their Influence Factors

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