Cited by 154Paleontology and Stratigraphy of FossilsGeological and Geochemical AnalysisGeochemistry and Elemental Analysis

O2constraints from Paleoproterozoic detrital pyrite and uraninite

Johnson, Jena E., Gerpheide, Aya, Lamb, Michael P., Fischer, Woodward W.·2014·Geological Society of America Bulletin

Abstract

Redox-sensitive detrital grains such as pyrite and uraninite in sedimentary successions provide one of the most conspicuous geological clues to a different composition of the Archean and early Paleoproterozoic atmosphere. Today, these minerals are rapidly chemically weathered within short transport distances. Prior to the rise of oxygen, low O_2 concentrations allowed their survival in siliciclastic deposits with grain erosion tied only to physical transport processes. After the rise of oxygen, redox-sensitive detrital grains effectively vanish from the sedimentary record. To get a better understanding of the timing of this transition, we examined sandstones recorded in a scientific drill core from the South African 2.415 Ga Koegas Subgroup, a mixed siliciclastic and iron formation–bearing unit deposited on the western deltaic margin of the Kaapvaal craton in early Paleoproterozoic time. We observed detrital pyrite and uraninite grains throughout all investigated sandstone beds in the section, indicating the rise of oxygen is younger than 2.415 Ga. To better understand how observations of detrital pyrite and uraninite in sedimentary rocks can quantitatively constrain Earth surface redox conditions, we constructed a model of grain erosion from chemical weathering and physical abrasion to place an upper limit on ancient environmental O_2 concentrations. Even conservative model calculations for deltaic depositional systems with sufficient transport distances (approximately hundreds of kilometers) show that redox-sensitive detrital grains are remarkably sensitive to environmental O_2 concentrations, and they constrain the Archean and early Paleoproterozoic atmosphere to have <3.2 × 10^(–5) atm of molecular O_2. These levels are lower than previously hypothesized for redox-sensitive detrital grains, but they are consistent with estimates made from other redox proxy data, including the anomalous fractionation of sulfur isotopes. The binary loss of detrital pyrite and uraninite from the sedimentary record coincident with the rise of oxygen indicates that atmospheric O_2 concentrations rose substantially at this time and were never again sufficiently low (<0.01 atm) to enable survival and preservation of these grains in short transport systems.

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Crossref · 10.1130/b30949.1

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  • Anoxia proxies include the lack of pre-GOE continental redbeds, detrital grains of siderite, uraninite, or pyrite that would oxidize at high pO2, and paleosols with iron washed out by anoxic rainwater.

    “Anoxia proxies that have long been recognized include the lack of pre-GOE continental sediments stained by red ferric oxides (redbeds), detrital grains from well-aerated rivers of siderite (FeCO3), uraninite (UO2), or pyrite that would oxidize and dissolve or rust at high pO2 (65, 66), and paleosols with iron washed out by anoxic rainwater [e.g., (67)].”

    From The Archean atmosphere (2020) · cites this paper as [66]

  • The pO2 constraint is generally consistent with apparent loss of detrital reduced minerals from coarse-grained coastal fluvial and marine sediments and evidence for iron oxidation in the terrestrial realm.

    “This is generally consistent with an apparent loss of detrital reduced minerals from coarse-grained coastal fluvial and marine sediments ( Johnson et al. 2014, Rasmussen & Buick 1999, Roscoe & Minter 1993) and evidence for iron oxidation in the terrestrial realm (Holland 1984, Rye & Holland 1998).”

    From The History of Ocean Oxygenation (2022) · cites this paper as Johnson et al. 2014

  • The absence of detrital pyrite and uraninite after ∼2.1 Ga suggests pO2>0.05 PAL.

    “the absence of detrital pyrite and uraninite after ∼2.1 Ga suggests9 pO2>0.05 PAL”
  • For rivers with short transport distances, often found in the most rapidly eroding terrains such as volcanic arc islands, some pyrite would survive oxidation at pO2<0.05 PAL.

    “Existing work9 estimates that for rivers with short transport distances, often found in the most rapidly eroding terrains (for example, on volcanic arc islands), some of this pyrite would survive oxidation at pO2<0.05 PAL.”
  • Redox-sensitive proxies are controlled by fluvial transport times and corresponding oxygen exposure, not by time spent in the weathering environment.

    “namely that they are controlled by fluvial transport times and corresponding oxygen exposure9, not by time spent in the weathering environment (as has erroneously been assumed in previous simpler models1458)”

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Authors
Johnson, J. E., Gerpheide, A., Lamb, M. P., & Fischer, W. W.
Affiliations
California Institute of Technology (US)
Venue
Geological Society of America Bulletin
Published
2014-02-27
Volume
126
Issue
5-6
Pages
813-830
ISSN
  • 0016-7606 (ISSN-L)
  • 1943-2674
OpenAlex
W2155549301
Cited by
154
References
102
Citations by year
2026: 8 · 2025: 10 · 2024: 19 · 2023: 8 · 2022: 11 · 2021: 12 · 2020: 13 · 2019: 21 · 2018: 14 · 2017: 12 · 2016: 13 · 2015: 11 · 2014: 2
FWCI
9.25
Type
journal article
Language
en
Open access
closed
Locations
  • Geological Society of America Bulletin (publishedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
Funders
Agouron Institute
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
Keywords
chemical weathering, Kaapvaal Craton, deltaic sandstones, iron-formation, sulfur isotope fractionation

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