Cited by 1,098Paleontology and Stratigraphy of FossilsGeochemistry and Elemental AnalysisGeological and Geochemical Analysis

Tracing the stepwise oxygenation of the Proterozoic ocean

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Scott, C., Lyons, T. W., Bekker, A., Shen, Y., Poulton, S. W., Chu, X., Anbar, A. D.·2008·Nature

Abstract

Biogeochemical signatures preserved in ancient sedimentary rocks provide clues to the nature and timing of the oxygenation of the Earth's atmosphere. Geochemical data suggest that oxygenation proceeded in two broad steps near the beginning and end of the Proterozoic eon (2,500 to 542 million years ago). The oxidation state of the Proterozoic ocean between these two steps and the timing of deep-ocean oxygenation have important implications for the evolutionary course of life on Earth but remain poorly known. Here we present a new perspective on ocean oxygenation based on the authigenic accumulation of the redox-sensitive transition element molybdenum in sulphidic black shales. Accumulation of authigenic molybdenum from sea water is already seen in shales by 2,650 Myr ago; however, the small magnitudes of these enrichments reflect weak or transient sources of dissolved molybdenum before about 2,200 Myr ago, consistent with minimal oxidative weathering of the continents. Enrichments indicative of persistent and vigorous oxidative weathering appear in shales deposited at roughly 2,150 Myr ago, more than 200 million years after the initial rise in atmospheric oxygen. Subsequent expansion of sulphidic conditions after about 1,800 Myr ago (refs 8, 9) maintained a mid-Proterozoic molybdenum reservoir below 20 per cent of the modern inventory, which in turn may have acted as a nutrient feedback limiting the spatiotemporal distribution of euxinic (sulphidic) bottom waters and perhaps the evolutionary and ecological expansion of eukaryotic organisms. By 551 Myr ago, molybdenum contents reflect a greatly expanded oceanic reservoir due to oxygenation of the deep ocean and corresponding decrease in sulphidic conditions in the sediments and water column.

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Crossref · 10.1038/nature06811

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  • Archean marine sediments have low concentrations of elements that enter rivers during oxidative continental weathering.

    “Furthermore, Archean marine sediments have low concentrations of elements that enter rivers during oxidative continental weathering (68–70).”

    From The Archean atmosphere (2020) · cites this paper as [68]

  • Low concentrations of redox sensitive elements (e.g., Mo and V) and their low ratios with TOC of marine black shales have been observed throughout Earth history before the Ediacaran, and interpreted as the result of low oxygen concentration in ocean and atmosphere.

    “Low concentrations of redox sensitive elements (e.g., Mo and V) and their low ratios with TOC of marine black shales have been observed throughout Earth history before the Ediacaran, and interpreted as the result of low oxygen concentration in ocean and atmosphere33,34.”
  • The uranium isotope record indicates that the modeled oxygenation state of the early Cambrian oceans was neither steady nor monotonous, but oscillated dramatically in concert with changes to the global marine carbon cycle as indicated by the δ13C curve.

    “The uranium isotope record indicates that the modeled oxygenation state of the early Cambrian oceans was neither steady nor monotonous (7–9, 47, 48), but rather oscillated dramatically in concert with changes to the global marine carbon cycle as indicated by the δ13C curve.”
  • Based on the collective data for the boring billion, Fe-rich (ferruginous) waters must have dominated the deeper ocean.

    “Based on the collective data for the boring billion (Arnold et al., 2004; Scott et al., 2008; Planavsky et al., 2011; Poulton and Canfield, 2011; Partin et al., 2013; Reinhard et al., 2013; as reviewed in Lyons et al., 2014), Fe-rich (ferruginous) waters must have dominated the deeper ocean.”
  • Muted metal enrichments in euxinic shales support the possibility of low marine molybdenum (Mo) inventories during the boring billion due to high rates of sediment uptake within the anoxic and euxinic oceans.

    “Muted metal enrichments in euxinic shales support the possibility of low marine molybdenum (Mo) inventories during the boring billion due to high rates of sediment uptake within the anoxic and euxinic oceans (Scott et al., 2008)”

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Authors
Scott, C., Lyons, T. W., Bekker, A., Shen, Y., Poulton, S. W., Chu, X., & Anbar, A. D.
Affiliations
  • University of California, Riverside (US)
  • Carnegie Institution for Science (US)
  • Université du Québec à Montréal (CA)
  • Newcastle University (GB)
  • Chinese Academy of Sciences (CN)
  • Arizona State University (US)
Corresponding author
Scott, C.
Venue
Nature
Published
2008-03
Volume
452
Issue
7186
Pages
456-459
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2041762395
Cited by
1,098
References
32
Citations by year
2026: 37 · 2025: 60 · 2024: 55 · 2023: 73 · 2022: 60 · 2021: 81 · 2020: 83 · 2019: 74 · 2018: 81 · 2017: 61 · 2016: 53 · 2015: 71 · 2014: 51 · 2013: 55 · 2012: 56
FWCI
37.03
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • Newcastle University ePrints (Newcastle Univesity)
Funders
  • National Science Foundation
  • Danmarks Grundforskningsfond
  • NASA Astrobiology Institute
  • Natural Sciences and Engineering Research Council of Canada
  • Natural Environment Research Council (NE/C518465/2)
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
molybdenum, black shales, oxidative weathering, total organic carbon, ocean redox state, atmospheric oxygenation, Neoproterozoic, Precambrian, sulfur cycling, early animal evolution, Precambrian stratigraphy
MeSH terms
Atmosphere, Molybdenum, Oceans and Seas, Oxygen, Seawater, Sulfides, Time Factors, Geologic Sediments, History, Ancient

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