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Cited by 86Paleontology and Stratigraphy of FossilsGeochemistry and Elemental AnalysisGeology and Paleoclimatology Research

A Cenozoic seawater redox record derived from 238U/235U in ferromanganese crusts

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Wang, X., Planavsky, N. J., Reinhard, C. T., Hein, J. R., Johnson, T. M.·2016·American Journal of Science
DOI 10.2475/01.2016.02
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Abstract

Oceanic oxygen levels are projected to drop in certain areas due to warming climate, but the net effect to the overall ocean redox state is difficult to predict. Here we measured the "stable" uranium isotope composition (^238^U/^235^U) in globally representative hydrogenous ferromanganese crusts in order to reconstruct the redox evolution of the global ocean throughout the Cenozoic. Samples averaging ∼3 Myr intervals have analytically indistinguishable ^238^U/^235^U throughout the Cenozoic. Combined with a U isotope mass balance model, we suggest that the overall ocean redox state has remained remarkably stable on million year time scales throughout the Cenozoic, despite large surface temperature fluctuations during this time. This suggests that stabilizing feedbacks (for example, nutrient limitation in low oxygen zones) may have prevented dramatic large-scale shifts in oxygen levels in the ocean. However, the Fe-Mn crust record will be unlikely to reflect rapid perturbations in ocean redox state. To investigate these events, sediment archives with faster accumulation rates and redox proxies with faster response time must be explored.

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  • Metal isotope systematics limit the extent of benthic anoxia to less than ∼1% of global seafloor area over the last ∼50 million years.

    “For example, metal isotope systematics limit the extent of benthic anoxia to less than ∼1% of global seafloor area over the same interval (Wang et al. 2016).”

    From The History of Ocean Oxygenation (2022) · cites this paper as Wang et al. 2016

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Cited by

Sorted by citations

Authors
Wang, X., Planavsky, N. J., Reinhard, C. T., Hein, J. R., & Johnson, T. M.
Affiliations
  • University of Illinois Urbana-Champaign (US)
  • Georgia Institute of Technology (US)
  • United States Geological Survey (US)
ORCID
Venue
American Journal of Science
Publisher
American Journal of Science (AJS)
Published
2016-01-01
Volume
316
Issue
1
Pages
64-83
ISSN
0002-9599 (ISSN-L)
DOI
10.2475/01.2016.02
OpenAlex
W2315739580
Cited by
86
References
10
Citations by year
2026: 3 · 2025: 7 · 2024: 3 · 2023: 13 · 2022: 9 · 2021: 17 · 2020: 9 · 2019: 5 · 2018: 11 · 2017: 5 · 2016: 2 · 2015: 1
FWCI
5.41
Type
journal article
Language
en
Open access
Locations
American Journal of Science (publishedVersion)
Funders
  • National Aeronautics and Space Administration
  • Agouron Institute
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 › Atmospheric Science › Geology and Paleoclimatology Research
Keywords
ocean redox state, uranium isotopes, ferromanganese crusts, Cenozoic, mass balance model, redox stability, nutrient limitation, paleoceanography, global warming

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