Two-billion-year-old evaporites capture Earth’s great oxidation

Author:

Blättler C. L.1ORCID,Claire M. W.234ORCID,Prave A. R.2,Kirsimäe K.5,Higgins J. A.1,Medvedev P. V.6ORCID,Romashkin A. E.6ORCID,Rychanchik D. V.6ORCID,Zerkle A. L.23ORCID,Paiste K.7ORCID,Kreitsmann T.5,Millar I. L.8ORCID,Hayles J. A.9,Bao H.10,Turchyn A. V.11ORCID,Warke M. R.2ORCID,Lepland A.571213

Affiliation:

1. Department of Geosciences, Princeton University, Princeton, NJ 08544, USA.

2. School of Earth and Environmental Sciences, University of St Andrews, St Andrews KY16 9AL, Scotland, UK.

3. Centre for Exoplanet Science, University of St Andrews, St Andrews KY16 9AL, Scotland, UK.

4. Blue Marble Space Institute of Science, 1001 4th Avenue, Suite 3201, Seattle, WA 98154, USA.

5. Department of Geology, University of Tartu, 50411 Tartu, Estonia.

6. Institute of Geology, Karelian Research Centre, Pushkinskaya 11, 185610 Petrozavodsk, Russia.

7. Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT The Arctic University of Norway, 9037 Tromsø, Norway.

8. NERC (Natural Environment Research Council) Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham NG12 5GG, England, UK.

9. Department of Earth Science, Rice University, 6100 Main Street, Houston, TX 77005, USA.

10. Department of Geology and Geophysics, E235 Howe-Russell Geoscience Complex, Louisiana State University, Baton Rouge, LA 70803, USA.

11. Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, England, UK.

12. Geological Survey of Norway, 7491 Trondheim, Norway.

13. Institute of Geology, Tallinn University of Technology, 19086 Tallinn, Estonia.

Abstract

A strongly oxidizing Paleoproterozoic era Two billion years ago, marine sulfate concentrations were around one-third as high as modern ones, constituting an oxidizing capacity equivalent to more than 20% of that of the modern ocean-atmosphere system. Blättler et al. found this by analyzing a remarkable evaporite succession more than 1 billion years older than the oldest comparable deposit discovered to date. These quantitative results, for a time when only more qualitative information was previously available, provide a constraint on the magnitude and timing of early Earth's response to the Great Oxidation Event 2.3 billion years ago. Science , this issue p. 320

Funder

Simons Foundation

H2020 European Research Council

Research Council of Norway

Estonian Science Agency

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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