North Atlantic sea surface temperature evolution across the Eocene–Oligocene transition

Utrecht University, The Netherlands (1); Unviersity of Bergen, Norway (2) The Eocene–Oligocene Transition (EOT, ~34 Ma), is marked by the rapid development of semi-permanent Antarctic ice-sheet1. Foraminiferal stable oxygen isotopes (δ18O) as well as Mg/Ca and other indicators (e.g. ice-rafted debri...

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Bibliographic Details
Main Authors: Kocken, Ilja Japhir, van der Veen, Kasper, Müller, Inigo R., Meckler, Anna Nele, Ziegler, Martin
Format: Text
Language:English
Published: Deutsche Geologische Gesellschaft - Geologische Vereinigung e.V. (DGGV) 2020
Subjects:
Antarctic
Norway
Bergen
Rosenthal
Antarc*
Newfoundland
North Atlantic
Online Access:https://dx.doi.org/10.48380/dggv-50x0-6c15
https://www.dggv.de/publikationen/dggv-e-publikationen/publication/80.html
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Summary:Utrecht University, The Netherlands (1); Unviersity of Bergen, Norway (2) The Eocene–Oligocene Transition (EOT, ~34 Ma), is marked by the rapid development of semi-permanent Antarctic ice-sheet1. Foraminiferal stable oxygen isotopes (δ18O) as well as Mg/Ca and other indicators (e.g. ice-rafted debris) indicate the development of permanent glaciation that potentially coincides with ~2.5 °Cdeep-sea cooling2. However, due to the nature of the δ18O proxy, uncertainties in the Mg/Ca concentrations of the palaeo-seawater, and calibration extrapolation/saturation to/at higher temperatures for organic proxies, it remains unclear how sea surface temperature (SST) changed across the EOT. In this study, we apply clumped-isotope palaeothermometry to well-preserved planktic foraminifera from the drift sediments of IODP Site 1411, Newfoundland, across four intervals bracketing the EOT. Initial findings indicate minor cooling across the interval, with absolute temperatures that are significantly lower than those reconstructed using other proxies3, a discrepancy that warrants further research. 1: Coxall, H. K., Pearson, P. N. (2007). The Eocene-Oligocene transition. Deep Time Perspectives on Climate Change: Marrying the Signal From Computer Models and Biological Proxies, p. 351-387. 2: Lear, C. H., Bailey, T. R., Pearson, P. N., Coxall, H. K. Rosenthal, Y. (2008) Cooling and ice growth across the Eocene-Oligocene transition. Geology 36, p. 251–254. 3: Liu, Z., He, Y., Jiang, Y., Wang, H., Liu, W., Bohaty, S. M., Wilson, P. A. (2018). Transient temperature asymmetry between hemispheres in the Palaeogene Atlantic Ocean. Nature Geoscience, 11(9), p. 656.

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