EGU21-3268
https://doi.org/10.5194/egusphere-egu21-3268
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

A stable oxygen isotope record of weather-timescale variability in the Eocene greenhouse world, using the giant marine gastropod Campanile giganteum

Nick Van Horebeek1, Johan Vellekoop1,2, Alexander J. Clark1, Niels J. de Winter2,3, Yannick Stroobandt1, and Robert P. Speijer1
Nick Van Horebeek et al.
  • 1Department of Earth and Environmental Sciences, Division Geology, KU Leuven, Celestijnenlaan 200E, 3001 Leuven, Belgium
  • 2Department of Chemistry, Analytical, Environmental and Geo- Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
  • 3Department of Geosciences, Universiteit Utrecht, Vening Meineszgebouw A, Princetonlaan 8a, 3584 CB Utrecht, Netherlands

Instrumental climate data are only available for the last few hundred years. To extend this record back in time, climate proxies are used. However, on the geological timescale, the temporal resolution of most paleoclimate records does not provide information about seasonality, let alone events on the weather-timescale. These weather-timescale events are becoming more frequently integrated in models to predict future climate change, but reconstructions of variability with such short timescales in the geological record are extremely rare.

A recent study by de Winter et al. (2020) has revealed that the Eocene giant marine gastropod Campanile giganteum (Lamarck, 1804) had growth rates exceeding 600 mm/year along the helix, far exceeding those of most other modern and fossil molluscs. With such high growth rates, these giant gastropods have the unique potential to record weather-timescale variability in the Eocene greenhouse world. Therefore, we generated a high-resolution (mm-scale) δ18O record on a well-preserved specimen of C. giganteum from the Paris Basin in Fleury-la-Rivière, France, in order to generate a unique ultra-high resolution record of intra-annual, weather-timescale variability in the Eocene. Our preliminary results show a clear seasonal pattern with δ18O values ranging between 0.1‰ and -2.5‰, superimposed by weekly variations of up to 0.5‰. This could provide insights in weather patterns in the Eocene greenhouse climate and potentially allow the identification of extreme weather events.

 

Reference

de Winter N.J., Vellekoop J., Clark A.J., Stassen P., Speijer R.P., Claeys P., (2020) The Giant Marine Gastropod Campanile Giganteum (Lamarck, 1804) as a High‐Resolution Archive of Seasonality in the Eocene Greenhouse World., Geochemistry, Geophysics, Geosystems, 21(4), https://doi.org/10.1029/2019GC008794

How to cite: Van Horebeek, N., Vellekoop, J., Clark, A. J., de Winter, N. J., Stroobandt, Y., and Speijer, R. P.: A stable oxygen isotope record of weather-timescale variability in the Eocene greenhouse world, using the giant marine gastropod Campanile giganteum, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-3268, https://doi.org/10.5194/egusphere-egu21-3268, 2021.