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Isotopic evidence for oxygenated Mesoarchaean shallow oceans

Nature Geosciencevolume 11pages133138 (2018) | Download Citation

Abstract

Mass-independent fractionation of sulfur isotopes (MIF-S) in Archaean sediments results from photochemical processing of atmospheric sulfur species in an oxygen-depleted atmosphere. Geological preservation of MIF-S provides evidence for microbial sulfate reduction (MSR) in low-sulfate Paleoarchaean (3.8–3.2 billion years ago (Ga)) and Neoarchaean (2.8–2.5 Ga) oceans, but the significance of MSR in Mesoarchaean (3.2–2.8 Ga) oceans is less clear. Here we present multiple sulfur and iron isotope data of early diagenetic pyrites from 2.97-Gyr-old stromatolitic dolomites deposited in a tidal flat environment of the Nsuze Group, Pongola Supergroup, South Africa. We identified consistently negative Δ33S values in pyrite, which indicates photochemical reactions under anoxic atmospheric conditions, but large mass-dependent sulfur isotope fractionations of ~30‰ in δ34S, identifying active MSR. Negative pyrite δ56Fe values (−1.31 to −0.88‰) record Fe oxidation in oxygen-bearing shallow oceans coupled with biogenic Fe reduction during diagenesis, consistent with the onset of local Fe cycling in oxygen oases ~3.0 Ga. We therefore suggest the presence of oxygenated near-shore shallow-marine environments with ≥5 μM sulfate at this time, in spite of the clear presence of an overall reduced Mesoarchaean atmosphere.

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Acknowledgements

B.E. acknowledges financial support by a Postdoctoral Fellowship of the University of Johannesburg, a Travel and Equipment Fellowship of the National Research Foundation of South Africa and an Intuitional Strategy Fellowship of the University of Tübingen (Deutsche Forschungsgemeinschaft, ZUK 63). The Stable Isotope Laboratory at McGill University was supported by the FQRNT through the GEOTOP research centre.

Author information

Author notes

    • Benjamin Eickmann

    Present address: Department of Geosciences, University of Tübingen, Tübingen, Germany

    • Martin Wille

    Present address: Institute of Geological Sciences, University of Bern, Bern, Switzerland

Affiliations

  1. Department of Geology, University of Johannesburg, Johannesburg, South Africa

    • Benjamin Eickmann
    •  & Axel Hofmann
  2. Department of Geosciences, University of Tübingen, Tübingen, Germany

    • Martin Wille
    •  & Ronny Schoenberg
  3. Department of Earth and Planetary Sciences, McGill University, Montreal, QC, Canada

    • Thi Hao Bui
    •  & Boswell A. Wing
  4. Department of Geological Sciences, University of Colorado, Boulder, CO, USA

    • Boswell A. Wing

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Contributions

B.E. and A.H. designed the study. A.H. provided samples. B.E., M.W. and T.H.B. generated data. B.E., M.W., B.A.W. and R.S. interpreted the data. B.E. wrote the paper with input from all the co-authors.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Benjamin Eickmann.

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    Supplementary Figures and Tables with geological setting and sample description.

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DOI

https://doi.org/10.1038/s41561-017-0036-x

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