Clumped-isotope-derived climate trends leading up to the end-Cretaceous mass extinction in northwestern Europe
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Published:2022-09-01
Issue:9
Volume:18
Page:1963-1982
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ISSN:1814-9332
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Container-title:Climate of the Past
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language:en
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Short-container-title:Clim. Past
Author:
O'Hora Heidi E.ORCID, Petersen Sierra V.ORCID, Vellekoop JohanORCID, Jones Matthew M., Scholz Serena R.
Abstract
Abstract. Paleotemperature reconstructions of the end-Cretaceous interval document local and global climate trends, some driven by greenhouse gas emissions from Deccan Traps volcanism and associated feedbacks. Here, we present a
new clumped-isotope-based paleotemperature record derived from fossil
bivalves from the Maastrichtian type region in southeastern Netherlands and
northeastern Belgium. Clumped isotope data document a mean temperature of 20.4±3.8 ∘C, consistent with other Maastrichtian temperature
estimates, and an average seawater δ18O value of 0.2±0.8 ‰ VSMOW for the region during the latest
Cretaceous (67.1–66.0 Ma). A notable temperature increase at
∼66.4 Ma is interpreted to be a regional manifestation of the
globally defined Late Maastrichtian Warming Event, linking Deccan Traps
volcanic CO2 emissions to climate change in the Maastricht region.
Fluctuating seawater δ18O values coinciding with temperature
changes suggest alternating influences of warm, salty southern-sourced
waters and cooler, fresher northern-sourced waters from the Arctic Ocean.
This new paleotemperature record contributes to the understanding of
regional and global climate response to large-scale volcanism and ocean
circulation changes leading up to a catastrophic mass extinction.
Funder
Geological Society of America
Publisher
Copernicus GmbH
Subject
Paleontology,Stratigraphy,Global and Planetary Change
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