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  • Chi Fru, ErnestStockholms universitet,Institutionen för geologiska vetenskaper,Stockholm University, Department of Geological Sciences (author)

Cu isotopes in marine black shales record the Great Oxidation Event

  • Article/chapterEnglish2016

Publisher, publication year, extent ...

  • 2016-04-18
  • Proceedings of the National Academy of Sciences,2016
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-131209
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-131209URI
  • https://doi.org/10.1073/pnas.1523544113DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-1806URI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • The oxygenation of the atmosphere similar to 2.45-2.32 billion years ago (Ga) is one of the most significant geological events to have affected Earth's redox history. Our understanding of the timing and processes surrounding this key transition is largely dependent on the development of redox-sensitive proxies, many of which remain unexplored. Here we report a shift from negative to positive copper isotopic compositions (delta Cu-65(ERM-AE633)) in organic carbon-rich shales spanning the period 2.66-2.08 Ga. We suggest that, before 2.3 Ga, a muted oxidative supply of weathering-derived copper enriched in Cu-65, along with the preferential removal of Cu-65 by iron oxides, left seawater and marine biomass depleted in Cu-65 but enriched in Cu-63. As banded iron formation deposition waned and continentally sourced Cu became more important, biomass sampled a dissolved Cu reservoir that was progressively less fractionated relative to the continental pool. This evolution toward heavy delta Cu-65 values coincides with a shift to negative sedimentary delta Fe-56 values and increased marine sulfate after the Great Oxidation Event (GOE), and is traceable through Phanerozoic shales to modern marine settings, where marine dissolved and sedimentary delta Cu-65 values are universally positive. Our finding of an important shift in sedimentary Cu isotope compositions across the GOE provides new insights into the Precambrian marine cycling of this critical micronutrient, and demonstrates the proxy potential for sedimentary Cu isotope compositions in the study of biogeochemical cycles and oceanic redox balance in the past.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • Rodriguez, Nathalie P.Stockholms universitet,Institutionen för geologiska vetenskaper,Stockholm University Department of Geological Sciences (author)
  • Partin, Camille A.University of Saskatchewan, Canada (author)
  • Lalonde, Stefan V.Université de Bretagne Occidentale, France (author)
  • Andersson, Per,1960-Naturhistoriska riksmuseet,Enheten för geovetenskap(Swepub:nrm)perander (author)
  • Weiss, Dominik J.Imperial College, London, UK (author)
  • El Albani, AbderrazakUniversité de Poitiers, France (author)
  • Rodushkin, IliaALS Scandinavia, Sweden (author)
  • Konhauser, Kurt O.University of Alberta, Canada (author)
  • Stockholms universitetInstitutionen för geologiska vetenskaper (creator_code:org_t)

Related titles

  • In:Proceedings of the National Academy of Sciences of the United States of America: Proceedings of the National Academy of Sciences113:18, s. 4941-49460027-84241091-6490

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