2021
DOI: 10.1126/sciadv.abh4224
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Lithium isotope evidence for enhanced weathering and erosion during the Paleocene-Eocene Thermal Maximum

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 c… Show more

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Cited by 75 publications
(95 citation statements)
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References 133 publications
(259 reference statements)
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“…The >3‰ negative excursion in δ 7 Li clay values in this study is likely driven by changes in weathering resulting from these environmental changes because long‐term sediment aggradation rates (van der Meulen et al., 2020), provenance (May et al., 2013), and δ 7 Li source values remained constant across the PETM (Figure 1b; see Section S1 in Supporting Information ). Notably, the magnitude of this excursion agrees with others from marine shale and carbonate transects that span the PETM (Pogge von Strandmann et al., 2021).…”
Section: Influence Of Climate and Landscape Position On Floodplain We...supporting
confidence: 88%
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“…The >3‰ negative excursion in δ 7 Li clay values in this study is likely driven by changes in weathering resulting from these environmental changes because long‐term sediment aggradation rates (van der Meulen et al., 2020), provenance (May et al., 2013), and δ 7 Li source values remained constant across the PETM (Figure 1b; see Section S1 in Supporting Information ). Notably, the magnitude of this excursion agrees with others from marine shale and carbonate transects that span the PETM (Pogge von Strandmann et al., 2021).…”
Section: Influence Of Climate and Landscape Position On Floodplain We...supporting
confidence: 88%
“…Altogether, these findings demonstrate that floodplain weathering dynamically responds to climate change and further illustrate the utility of Li isotope ratios in detecting weathering changes in sedimentary archives (Pogge von Strandmann et al, 2021). Unlike weathering on mountain hillslopes, the climatic sensitivity of which is tied to the kinetics of silicate mineral dissolution (Bufe et al, 2021), floodplain weathering involves mineral residence times long enough to counter these dissolution kinetics (Dosseto et al, 2006;Torres et al, 2017).…”
Section: Influence Of Climate and Landscape Position On Floodplain We...mentioning
confidence: 62%
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“…The burial of this organic carbon is also assisted by the supply of continent-derived particulate material (Kennedy and Wagner, 2011). Hence, silicate weathering influences both the inorganic and organic pathways of the long-term carbon cycle, on timescales from yearly (for organic carbon) to tens of kyr (for carbonate precipitation) (e.g., Colbourn et al, 2015;Pogge von Strandmann et al, 2017, 2021a.…”
Section: Introductionmentioning
confidence: 99%
“…(2022) recognize a deepening in the section, although vary slightly in their exact facies determinations. Alternatively, this increase in clay content could also be interpreted as an increase in clay deposition into the region, caused by increased weathering on land across the PETM (Pogge von Strandmann et al., 2021) also supported by abundant microstylolites in the foralgal grainstone‐packstones, coinciding with the advent of the CIE.…”
Section: Discussionmentioning
confidence: 99%