Pogge von Strandmann, PAE;
Jones, MT;
West, AJ;
Murphy, MJ;
Stokke, EW;
Tarbuck, G;
Wilson, DJ;
... Schmidt, DN; + view all
(2021)
Lithium isotope evidence for enhanced weathering and erosion during the Paleocene-Eocene Thermal Maximum.
Science Advances
, 7
(42)
, Article eabh4224. 10.1126/sciadv.abh4224.
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Abstract
The Paleocene-Eocene Thermal Maximum (PETM; ~55.9 Ma) was a geologically rapid warming period associated with carbon release, which caused a marked increase in the hydrological cycle. Here, we use lithium (Li) isotopes to assess the global change in weathering regime, a critical carbon drawdown mechanism, across the PETM. We find a negative Li isotope excursion of ~3‰ in both global seawater (marine carbonates) and in local weathering inputs (detrital shales). This is consistent with a very large delivery of clays to the oceans or a shift in the weathering regime toward higher physical erosion rates and sediment fluxes. Our seawater records are best explained by increases in global erosion rates of ~2× to 3× over 100 ka, combined with model-derived weathering increases of 50 to 60% compared to prewarming values. Such increases in weathering and erosion would have supported enhanced carbon burial, as both carbonate and organic carbon, thereby stabilizing climate.
| Type: | Article |
|---|---|
| Title: | Lithium isotope evidence for enhanced weathering and erosion during the Paleocene-Eocene Thermal Maximum |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1126/sciadv.abh4224 |
| Publisher version: | https://doi.org/10.1126/sciadv.abh4224 |
| Language: | English |
| Additional information: | Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). This is an open-access article distributed under the terms of the Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
| 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-pp.ucl.ac.uk/id/eprint/10136701 |
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