The Isotope Geochemistry of Zinc and Copper

Moynier, Frédéric; Vance, Derek; Fujii, Toshiyuki; Savage, Paul S.

doi:10.2138/rmg.2017.82.13

Cited by 318 publications

(267 citation statements)

References 252 publications

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“…1. In contrast, other groups have found that sorption of Zn and Ni to both cellular and abiotic surfaces leads to substantial fractionations (see review in Moynier et al 2017), with the heavy isotope preferentially absorbed. In a parallel approach, theoretical calculations have also led to valuable constraints on the magnitude of isotope fractionations.…”

Section: Constraints On Fractionation Mechanismsmentioning

confidence: 93%

The oceanic cycles of the transition metals and their isotopes

et al. 2017

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The stable isotope systems of the transition metals potentially provide constraints on the current and past operation of the biological pump, and on the state of ocean redox in Earth history. Here we focus on two exemplar metals, nickel (Ni) and zinc (Zn). The oceanic dissolved pool of both elements is isotopically heavier than the known inputs, implying an output with light isotope compositions. The modern oceanic cycle of both these elements is dominated by biological uptake into photosynthesised organic matter and output to sediment. It is increasingly clear, however, that such uptake is associated with only very minor isotope fractionation. We suggest that the isotopic balance is instead closed by the sequestration of light isotopes to sulphide in anoxic and organic-rich sediments, so that it is ocean chemistry that controls these isotope systems, and suggesting a different but equally interesting array of questions in Earth history that can be addressed with these systems.

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Section: Constraints On Fractionation Mechanismsmentioning

confidence: 93%

The oceanic cycles of the transition metals and their isotopes

et al. 2017

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“…Table 1 briefly reviews current research on these isotopes in ores and the topics that are being addressed. [124,125] The origin of komatiite-and laterite-hosted nickel ores Cu [126] and references therein, [127][128][129][130][131] Redox-induced fractionations wide large variability in supergene ores; large potential for application to complex deposits, e.g., IOCGs…”

Section: Non-traditional Stable Isotopesmentioning

confidence: 99%

“…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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“…Zinc isotope compositions of soils are anticipated to be offset from the composition of the parent material by the removal or addition of significant pools of fractionated Zn, driven by mineral or organic constituents Moynier et al, 2017). In soils in which OC is included in a stable OC pool, organic carbon is briefly preserved from decomposition (Chenu and Plante, 2006;Mikutta et al, 2006).…”

Section: Introductionmentioning

confidence: 99%