Climate of the Past
Climate of the Past
CP
Articles | Volume 22, issue 3
Articles | Volume 22, issue 3
https://doi.org/10.5194/cp-22-709-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-22-709-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 3
Research article
 | 
31 Mar 2026
Research article |  | 31 Mar 2026

Silicate weathering in the semi-arid Southern Pyrenees during the PETM: lithium isotope evidence

Rocio Jaimes-Gutierrez, Marine Prieur, David J. Wilson, Philip A. E. Pogge von Strandmann, Emmanuelle Pucéat, Thierry Adatte, Jorge E. Spangenberg, and Sébastien Castelltort

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Short summary
How do semi-arid landscapes respond to rapid global warming? During the Palaeocene-Eocene Thermal Maximum – an extreme warming event 56 Ma ago – global lithium isotope records show a negative δ7Li excursion, suggesting an increase in weathering fluxes. In the Southern Pyrenees, we find the opposite behaviour: clay δ7Li values became ~1‰ heavier, indicating enhanced clay formation. These results suggest that regional hydroclimatic conditions can decouple regional signals from global averages.
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