Cited by 482Paleontology and Stratigraphy of FossilsGeochemistry and Elemental AnalysisGeological and Geochemical Analysis

Low marine sulphate and protracted oxygenation of the Proterozoic biosphere

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Kah, Linda C., Lyons, Timothy W., Frank, Tracy D.·2004·Nature

Abstract

Progressive oxygenation of the Earth's early biosphere is thought to have resulted in increased sulphide oxidation during continental weathering, leading to a corresponding increase in marine sulphate concentration. Accurate reconstruction of marine sulphate reservoir size is therefore important for interpreting the oxygenation history of early Earth environments. Few data, however, specifically constrain how sulphate concentrations may have changed during the Proterozoic era (2.5-0.54 Gyr ago). Prior to 2.2 Gyr ago, when oxygen began to accumulate in the Earth's atmosphere, sulphate concentrations are inferred to have been <1 mM and possibly <200 microM, on the basis of limited isotopic variability preserved in sedimentary sulphides and experimental data showing suppressed isotopic fractionation at extremely low sulphate concentrations. By 0.8 Gyr ago, oxygen and thus sulphate levels may have risen significantly. Here we report large stratigraphic variations in the sulphur isotope composition of marine carbonate-associated sulphate, and use a rate-dependent model for sulphur isotope change that allows us to track changes in marine sulphate concentrations throughout the Proterozoic. Our calculations indicate sulphate levels between 1.5 and 4.5 mM, or 5-15 per cent of modern values, for more than 1 Gyr after initial oxygenation of the Earth's biosphere. Persistence of low oceanic sulphate demonstrates the protracted nature of Earth's oxygenation. It links biospheric evolution to temporal patterns in the depositional behaviour of marine iron- and sulphur-bearing minerals, biological cycling of redox-sensitive elements and availability of trace metals essential to eukaryotic development.

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  1. [19]19. Gellatly, A. M. & Lyons, T. W. Trace sulfate in Mid-Proterozoic carbonates and the sulfur isotope record. Geochim. Cosmochim. Acta (in the press)

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Authors
Kah, L. C., Lyons, T. W., & Frank, T. D.
Affiliations
  • University of Tennessee at Knoxville (US)
  • University of Missouri (US)
  • University of Nebraska–Lincoln (US)
Corresponding author
Kah, Linda C.
Venue
Nature
Published
2004-10
Volume
431
Issue
7010
Pages
834-838
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2097417202
Cited by
482
References
31
Citations by year
2026: 11 · 2025: 23 · 2024: 23 · 2023: 23 · 2022: 18 · 2021: 22 · 2020: 26 · 2019: 37 · 2018: 31 · 2017: 20 · 2016: 17 · 2015: 24 · 2014: 16 · 2013: 31 · 2012: 30
FWCI
14.27
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • Lincoln (University of Nebraska) (submittedVersion)
  • RePEc: Research Papers in Economics (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 › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
Keywords
sulfur isotopes, sulfide oxidation, continental weathering, early Earth atmosphere, eukaryotic evolution, trace metal availability, redox-sensitive elements
MeSH terms
Atmosphere, Calcium Sulfate, Carbonates, Environment, Eukaryotic Cells, Biological Evolution, Oxygen, Seawater, Sulfates, Time Factors, Geologic Sediments

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