Tellurium, selenium and cobalt enrichment in Neoproterozoic black shales, Gwna Group, UK: Deep marine trace element enrichment during the Second Great Oxygenation Event

Joseph G T Armstrong, John Parnell, Liam A Bullock, Magali Perez, Adrian Boyce, Jörg Feldmann

Research output: Contribution to journalArticle

4 Citations (Scopus)
11 Downloads (Pure)

Abstract

Black shales of the late Neoproterozoic Gwna Group (570-580 Ma), UK, contain enrichments of tellurium (Te), selenium (Se) and cobalt (Co) relative to average shale compositions. The Te and Co enrichments bear comparison with those of ferromanganese crusts in the modern deep ocean. Gwna Group deposition coincides with the Second Great Oxidation Event, which had a significant effect on trace element fixation globally. Selenium and Te concentrations within these black shales indicate increased continental weathering rates, high biological productivity and corresponding increases in atmospheric O2 concentrations. Cobalt, nickel (Ni) and arsenic (As) enrichments in this succession are secondary mineralisation phases. Demand for many of the trace elements found enriched in the Gwna Group black shales make their mechanisms of accumulation, and variations through the geological record important to understand, and suggests that new resources may be sought based on black shale protoliths from this period.
Original languageEnglish
Pages (from-to)244-253
Number of pages10
JournalTerra Nova
Volume30
Issue number3
Early online date24 Mar 2018
DOIs
Publication statusPublished - Jun 2018

Keywords

  • black shales
  • geochemistry
  • Neoproterozoic
  • atmospheric oxygentation
  • selenium

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