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<p>The moderate impact of rapid global warming on oceanic redox and biodiversity during the Paleocene-Eocene thermal maximum (PETM; ~55.9 Ma) contrasts with other hyperthermal events in Earth’s history, and remains mostly unexplained. Here, we use lithium isotope (δ<sup>7</sup>Li) proxy and Earth system model simulations to reconstruct continental weathering regimes during the PETM. Negative δ<sup>7</sup>Li excursions of 3–4‰ in shallow-marine carbonates suggests globally increased erosion rates and decreased weathering intensities. Further, large negative δ<sup>7</sup>Li excursions of 4–5‰ in siliciclastic successions reflect enhanced accumulation of detrital clays exhumed from previous clay-rich sedimentary rocks, rather than those from weathering of igneous rocks. Changes in continental weathering regimes and associated flux of nutrients to oceans provide an explanation to the muted increase in oceanic anoxia and overall biodiversity loss during the PETM. The concomitant increases in physical erosion and clay delivery also enhanced organic carbon burial efficiency, permitting rapid return of global climate to pre-perturbation state.</p>

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Changes in continental weathering regimes inhibited global marine deoxygenation during the Paleocene-Eocene thermal maximum

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月15日

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  • Guang-Yi Wei,
  • Alexandre Pohl,
  • Shijun Jiang,
  • Hua Zhang,
  • Wenqian Wang,
  • Philip A. E. Pogge von Strandmann,
  • Pierre Maffre,
  • Guolin Xiong,
  • Shu-zhong Shen,
  • Feifei Zhang

摘要

The moderate impact of rapid global warming on oceanic redox and biodiversity during the Paleocene-Eocene thermal maximum (PETM; ~55.9 Ma) contrasts with other hyperthermal events in Earth’s history, and remains mostly unexplained. Here, we use lithium isotope (δ7Li) proxy and Earth system model simulations to reconstruct continental weathering regimes during the PETM. Negative δ7Li excursions of 3–4‰ in shallow-marine carbonates suggests globally increased erosion rates and decreased weathering intensities. Further, large negative δ7Li excursions of 4–5‰ in siliciclastic successions reflect enhanced accumulation of detrital clays exhumed from previous clay-rich sedimentary rocks, rather than those from weathering of igneous rocks. Changes in continental weathering regimes and associated flux of nutrients to oceans provide an explanation to the muted increase in oceanic anoxia and overall biodiversity loss during the PETM. The concomitant increases in physical erosion and clay delivery also enhanced organic carbon burial efficiency, permitting rapid return of global climate to pre-perturbation state.