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<p>Mass extinctions in the early Palaeozoic have been attributed to global climate change and ocean anoxia with elevated phosphorus (P) proposed&#xa0;as a key driver. However, this hypothesis has lacked geochemical support due to the absence of proxies that can reconstruct changes in marine P availability. Focusing on the Late Ordovician Mass Extinction (LOME) and the Late Devonian Mass Extinction (LDME), we present carbonate-associated phosphate (CAP) data from seven globally distributed sections, providing a proxy record for seawater P variation across these events. Our data reveal short-lived, globally coherent P pulses that coincided with both events. These transient P surges align with biodiversity loss, widespread anoxia, and seawater temperature declines, suggesting a link between P flux, ocean anoxia, and global climate shifts, as supported by biogeochemical model results. These findings provide an&#xa0;empirical connection between brief marine P pulses and ecological crises during the LOME and LDME.</p>

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Recurring marine phosphorus spikes during major palaeozoic mass extinctions and climate change

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月24日

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  • Matthew S. Dodd,
  • Chao Li,
  • Zihu Zhang,
  • Aleksey Y. Sadekov,
  • André Desrochers,
  • Olle Hints,
  • Detian Yan,
  • Xiangrong Yang,
  • Annette D. George,
  • Maya Elrick,
  • David White,
  • Wenkun Qie,
  • Bo Chen,
  • Andrew S. Merdith,
  • Benjamin J. W. Mills

摘要

Mass extinctions in the early Palaeozoic have been attributed to global climate change and ocean anoxia with elevated phosphorus (P) proposed as a key driver. However, this hypothesis has lacked geochemical support due to the absence of proxies that can reconstruct changes in marine P availability. Focusing on the Late Ordovician Mass Extinction (LOME) and the Late Devonian Mass Extinction (LDME), we present carbonate-associated phosphate (CAP) data from seven globally distributed sections, providing a proxy record for seawater P variation across these events. Our data reveal short-lived, globally coherent P pulses that coincided with both events. These transient P surges align with biodiversity loss, widespread anoxia, and seawater temperature declines, suggesting a link between P flux, ocean anoxia, and global climate shifts, as supported by biogeochemical model results. These findings provide an empirical connection between brief marine P pulses and ecological crises during the LOME and LDME.