Wei, Guang-Yi;
Pohl, Alexandre;
Jiang, Shijun;
Zhang, Hua;
Wang, Wenqian;
A E Pogge von Strandmann, Philip;
Maffre, Pierre;
... Zhang, Feifei; + view all
(2025)
Changes in continental weathering regimes inhibited global marine deoxygenation during the Paleocene-Eocene thermal maximum.
Nature Communications
, 16
, Article 9163. 10.1038/s41467-025-64217-0.
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Abstract
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.
| Type: | Article |
|---|---|
| Title: | Changes in continental weathering regimes inhibited global marine deoxygenation during the Paleocene-Eocene thermal maximum |
| Location: | England |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1038/s41467-025-64217-0 |
| Publisher version: | https://doi.org/10.1038/s41467-025-64217-0 |
| Language: | English |
| Additional information: | This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10215919 |
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