Cited by 109Paleontology and Stratigraphy of FossilsGeochemistry and Elemental AnalysisOrigins and Evolution of Life

Late Archean euxinic conditions before the rise of atmospheric oxygen

Scott, Clinton T., Bekker, Andrey, Reinhard, Christopher T., Schnetger, Bernhard, Krapež, Bryan, Rumble, Douglas, Lyons, Timothy W.·2011·Geology

Abstract

Life on Earth is thought to have coevolved with the chemistry of the oceans and atmosphere, and the shift from an anoxic to an oxic world across the Archean-Proterozoic boundary represents a fundamental step in this process. In order to understand the relative influence of biological and geological factors on this transition, we must constrain key variables in seawater chemistry before the Great Oxidation Event (ca. 2500 Ma). We present a multi-element (C-S-Fe-Mo) biogeochemical study of ca. 2662 Ma shales from the Hamersley Province in Western Australia. Our data reveal a sustained episode of Fe-limited pyrite formation under an anoxic and sulfidic (euxinic) water column. This is the oldest known occurrence of euxinia in Earth’s history and challenges the paradigm of persistently Fe-rich Archean oceans. Bulk trace metal chemistry and preservation of strong mass-independent S isotope fractionations in sedimentary pyrites indicate that ocean euxinia was possible prior to oxidative weathering, suggesting that sulfidic waters may have been common throughout the Archean Eon. C-S-Fe systematics suggest that oxygenic photosynthesis was the primary source of organic carbon in the basin, and the absence of Mo enrichments highlights a potential link between inefficient nitrogen fixation and the delayed arrival of the Great Oxidation Event.

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Crossref · 10.1130/g31571.1

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Authors
Scott, C. T., Bekker, A., Reinhard, C. T., Schnetger, B., Krapež, B., Rumble, D., & Lyons, T. W.
Affiliations
  • University of California, Riverside (US)
  • University of Manitoba (CA)
  • Carl von Ossietzky Universität Oldenburg (DE)
  • Curtin University (AU)
Corresponding author
Scott, Clinton T.
Venue
Geology
Published
2011-02
Volume
39
Issue
2
Pages
119-122
ISSN
  • 0091-7613 (ISSN-L)
  • 1943-2682
OpenAlex
W2069391178
Cited by
109
References
33
Citations by year
2026: 2 · 2025: 6 · 2024: 6 · 2023: 1 · 2022: 1 · 2021: 3 · 2020: 8 · 2019: 10 · 2018: 7 · 2017: 7 · 2016: 8 · 2015: 6 · 2014: 7 · 2013: 16 · 2012: 13
FWCI
9.74
Type
journal article
Language
en
Open access
closed
Locations
  • Geology (publishedVersion)
  • eSpace (Curtin University) (submittedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Origins and Evolution of Life
Keywords
Great Oxidation Event, Archean-Proterozoic boundary, molybdenum, nitrogen fixation, oxygenic photosynthesis, oxidative weathering

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