UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Lithium isotope evidence for enhanced weathering and erosion during the Paleocene-Eocene Thermal Maximum

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. Green open access

[thumbnail of Pogge Von Strandmann_Lithium isotope evidence for enhanced weathering and erosion during the Paleocene-Eocene Thermal Maximum_VoR.pdf]
Preview
Text
Pogge Von Strandmann_Lithium isotope evidence for enhanced weathering and erosion during the Paleocene-Eocene Thermal Maximum_VoR.pdf - Published Version

Download (2MB) | Preview

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.ucl.ac.uk/id/eprint/10136701
Downloads since deposit
47Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item