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1 results

  • Cadmium sulfide in a Mesoproterozoic terrestrial environment

  • J. Parnell, J. Still, S. Spinks, W. Thayalan, S. Bowden
  • Journal:
    Mineralogical Magazine / Volume 78 / Issue 1 / February 2014
    Published online by Cambridge University Press:
    05 July 2018, pp. 47-54

  • Cadmium sulfide mineralization occurs in grey-black shales of the late Mesoproterozoic Stoer Group, Torridonian Supergroup, northwest Scotland. Cadmium is strongly redox-controlled, and normally concentrated in anoxic marine sediments or epigenetic mineralization involving organic matter. However the Stoer Group was deposited in a terrestrial environment, including lacustrine deposits of shale. At the limited levels of atmospheric oxygenation in the Mesoproterozoic (∼10% of present), the near-surface environment could have fluctuated between oxic and anoxic, allowing fractionation of Cd from Zn, and the formation of Cd sulfide rather than Cd-bearing sphalerite. This occurrence emphasizes the importance of the Stoer Group as a record of the Mesoproterozoic terrestrial environment.