Lithium isotope evidence for enhanced weathering and erosion during the Paleocene-Eocene Thermal Maximum
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- Lithium isotope evidence for enhanced weathering and erosion during the Paleocene-Eocene Thermal Maximum
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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.
Originalsprog | Engelsk |
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Artikelnummer | eabh4224 |
Tidsskrift | Science Advances |
Vol/bind | 7 |
Udgave nummer | 42 |
Antal sider | 11 |
ISSN | 2375-2548 |
DOI | |
Status | Udgivet - 2021 |
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© 2021 American Association for the Advancement of Science. All rights reserved.
CENPERMOA[2021]
ID: 284085443