Cited by 139Paleontology and Stratigraphy of FossilsGeochemistry and Elemental AnalysisGeology and Paleoclimatology Research

Global-ocean redox variation during the middle-late Permian through Early Triassic based on uranium isotope and Th/U trends of marine carbonates

Elrick, Maya, Polyak, Victor, Algeo, Thomas J., Romaniello, Stephen, Asmerom, Yemane, Herrmann, Achim D., Anbar, Ariel D., Zhao, Laishi +1 more·2017·Geology

Abstract

Uranium isotopes (238U/235U) in carbonates, a proxy for global-ocean redox conditions owing to their redox sensitivity and long residence time in seawater, exhibit substantial variability in the Daxiakou section of south China from the upper-middle Permian through the mid-lower Triassic (∼9 m.y.). Middle and late Permian ocean redox conditions were similar to that of the modern ocean and were characterized by improving oxygenation in the ∼2 m.y. prior to the latest Permian mass extinction (LPME), countering earlier interpretations of sustained or gradually expanding anoxia during this interval. The LPME coincided with an abrupt negative shift of >0.5‰ in δ238U that signifies a rapid expansion of oceanic anoxia. Intensely anoxic conditions persisted for at least ∼700 k.y. (Griesbachian), lessening somewhat during the Dienerian. Th/U concentration ratios vary inversely with δ238U during the Early Triassic, with higher ratios reflecting reduced U concentrations in global seawater as a consequence of large-scale removal to anoxic facies. Modeling suggests that 70%–100% of marine U was removed to anoxic sinks during the Early Triassic, resulting in seawater U concentrations of <5% that of the modern ocean. Rapid intensification of anoxia concurrent with the LPME implies that ocean redox changes played an important role in the largest mass extinction event in Earth history.

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Crossref · 10.1130/g38585.1

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  • The δ238U proxy has reliably recorded negative δ238U excursions at times when anoxic water masses expanded in the oceans.

    “The δ238U proxy has been applied to better constrain oceanic anoxic events (OAEs) in the past and reliably recorded negative δ238U excursions at times when anoxic water masses expanded in the oceans (19–23).”

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Authors
Elrick, M., Polyak, V., Algeo, T. J., Romaniello, S., Asmerom, Y., Herrmann, A. D., Anbar, A. D., Zhao, L., & Chen, Z.-Q.
Affiliations
  • University of New Mexico (US)
  • China University of Geosciences (CN)
  • Arizona State University (US)
  • Louisiana State University (US)
Venue
Geology
Published
2017-02-01
Volume
45
Issue
2
Pages
163-166
ISSN
  • 0091-7613 (ISSN-L)
  • 1943-2682
OpenAlex
W2560464734
Cited by
139
References
36
Citations by year
2026: 5 · 2025: 16 · 2024: 7 · 2023: 10 · 2022: 16 · 2021: 18 · 2020: 19 · 2019: 20 · 2018: 21 · 2017: 7
FWCI
13.30
Type
journal article
Language
en
Open access
closed
Locations
  • Geology (publishedVersion)
  • Civil War Book Review (submittedVersion)
Funders
  • National Science Foundation
  • National Aeronautics and Space Administration
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, uranium isotopes, Th/U ratio, Permian-Triassic boundary, ocean anoxia, marine carbonates, Griesbachian, Dienerian, Early Triassic

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