Cadmium sulfide in a Mesoproterozoic terrestrial environment

J. Parnell*, J. Still, S. Spinks, W. Thayalan, S. Bowden

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

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 (similar to 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.

Original languageEnglish
Pages (from-to)47-54
Number of pages8
JournalMineralogical Magazine
Volume78
Issue number1
DOIs
Publication statusPublished - Feb 2014

Keywords

  • cadmium
  • greenockite
  • Mesoproterozoic
  • Torridonian
  • oxygenation
  • Scotland
  • Northwest Scotland
  • suboxic sediments
  • Stoer group
  • white-pine
  • ocean
  • zinc
  • deposits
  • metal
  • shale
  • CD

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