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Late Paleozoic oxygenation of marine environments supported by dolomite U-Pb dating

Author

Listed:
  • Michal Ben-Israel

    (The Hebrew University of Jerusalem
    University of California)

  • Robert M. Holder

    (University of Michigan)

  • Lyle L. Nelson

    (Carleton University, Ottawa
    Massachusetts Institute of Technology, Cambridge)

  • Emily F. Smith

    (Johns Hopkins University)

  • Andrew R. C. Kylander-Clark

    (University of California, Santa Barbara)

  • Uri Ryb

    (The Hebrew University of Jerusalem)

Abstract

Understanding causal relationships between evolution and ocean oxygenation hinges on reliable reconstructions of marine oxygen levels, typically from redox-sensitive geochemical proxies. Here, we develop a proxy, using dolomite U–Pb geochronology, to reconstruct seawater U/Pb ratios. Dolomite samples consistently give U–Pb dates and initial 207Pb/206Pb ratios lower than expected from their stratigraphic ages. These observations are explained by resetting of the U–Pb system long after deposition; the magnitude of deviations from expected initial 207Pb/206Pb are a function of the redox-sensitive U/Pb ratios during deposition. Reconstructed initial U/Pb ratios increased notably in the late-Paleozoic, reflecting an increase in oxygenation of marine environments at that time. This timeline is consistent with documented shifts in some other redox proxies and supports evolution-driven mechanisms for the oxygenation of late-Paleozoic marine environments, as well as suggestions that early animals thrived in oceans that on long time scales were oxygen-limited compared to today.

Suggested Citation

  • Michal Ben-Israel & Robert M. Holder & Lyle L. Nelson & Emily F. Smith & Andrew R. C. Kylander-Clark & Uri Ryb, 2024. "Late Paleozoic oxygenation of marine environments supported by dolomite U-Pb dating," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46660-7
    DOI: 10.1038/s41467-024-46660-7
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    References listed on IDEAS

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    1. Xi Chen & Hong-Fei Ling & Derek Vance & Graham A. Shields-Zhou & Maoyan Zhu & Simon W. Poulton & Lawrence M. Och & Shao-Yong Jiang & Da Li & Lorenzo Cremonese & Corey Archer, 2015. "Rise to modern levels of ocean oxygenation coincided with the Cambrian radiation of animals," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
    2. Swapan K. Sahoo & Noah J. Planavsky & Brian Kendall & Xinqiang Wang & Xiaoying Shi & Clint Scott & Ariel D. Anbar & Timothy W. Lyons & Ganqing Jiang, 2012. "Ocean oxygenation in the wake of the Marinoan glaciation," Nature, Nature, vol. 489(7417), pages 546-549, September.
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