Cited by 162Paleontology and Stratigraphy of FossilsGeochemistry and Elemental AnalysisGeological and Geochemical Analysis

Evidence for free oxygen in the Neoarchean ocean based on coupled iron–molybdenum isotope fractionation

Czaja, Andrew D., Johnson, Clark M., Roden, Eric E., Beard, Brian L., Voegelin, Andrea R., Nägler, Thomas F., Beukes, Nicolas J., Wille, Martin·2012·Geochimica et Cosmochimica Acta

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Crossref · 10.1016/j.gca.2012.03.007

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124 of 124 references verified0 citation errors · 0 not checkable

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  • In the Nauga Formation, observations co-occur with evidence from stable iron isotopes for partial iron oxidation.

    “In the Nauga Formation, these observations co-occur with evidence from stable iron isotopes for partial iron oxidation (Czaja et al. 2012).”

    From The History of Ocean Oxygenation (2022) · cites this paper as Czaja et al. 2012

  • Strong Re and Mo enrichments and coupled Mo-Fe isotope data were interpreted as evidence for oxidative weathering of sulfide-bearing minerals on the continents, and thus the evolution of oxygenic photosynthesis as early as ca. 2.6 Ga.

    “Strong Re and Mo enrichments and coupled Mo-Fe isotope data were interpreted as evidence for oxidative weathering of sulfide-bearing minerals on the continents, and thus the evolution of oxygenic photosynthesis as early as ca. 2.6 Ga (Anbar et al., 2007; Kendall et al., 2010; Czaja et al., 2012; Stüeken et al., 2015b).”
  • Czaja et al. estimated 35 μM O2 content in the photic zone during 2.65-2.5 Ga, being ~12% of modern level.

    “The calculations of Czaja et al. (2012), based on covariation in Mo and Fe isotope compositions in carbonates of the 2.65-2.5 Ga Campbellrand-Malmami carbonate platform, estimated 35 µM O2 content in the photic zone during this time period, being ~12% of modern level.”
  • Estimates of maximum O2 contents in shallow oceans potentially provide evidence that the shallow oceans had significant free O2 levels by 3.2 Ga, hundreds of millions of years prior to the rise in atmospheric O2.

    “potentially provide evidence that the shallow oceans had significant free O2 levels by 3.2 Ga, hundreds of millions of years prior to the rise in atmospheric O2.”

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Authors
Czaja, A. D., Johnson, C. M., Roden, E. E., Beard, B. L., Voegelin, A. R., Nägler, T. F., Beukes, N. J., & Wille, M.
Affiliations
  • University of Wisconsin–Madison (US)
  • University of Bern (CH)
  • University of Johannesburg (ZA)
  • University of Tübingen (DE)
Corresponding author
Czaja, Andrew D.
Venue
Geochimica et Cosmochimica Acta
Publisher
Elsevier BV
Published
2012-06
Volume
86
Pages
118-137
ISSN
0016-7037 (ISSN-L)
OpenAlex
W2136298067
Cited by
162
References
125
Citations by year
2026: 3 · 2025: 12 · 2024: 11 · 2023: 7 · 2022: 13 · 2021: 11 · 2020: 10 · 2019: 9 · 2018: 16 · 2017: 14 · 2016: 9 · 2015: 14 · 2014: 11 · 2013: 20 · 2012: 2
FWCI
11.21
Type
journal article
Language
en
Open access
closed
Locations
Geochimica et Cosmochimica Acta (publishedVersion)
Funders
  • NASA Astrobiology Institute
  • Swiss National Science Foundation (20021-126759)
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 › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
Keywords
Great Oxidation Event, free oxygen, Fe(II) oxidation, oxygenic photosynthesis, iron-formation, Kaapvaal Craton

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