EGU General Assembly 2021
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Preliminary biostratigraphy of IODP Expedition 383 sites

Mariem Saavedra-Pellitero1, Anieke Brombacher2, Oliver Esper3, Alexandre de Souza4, Elisa Malinverno5, Igor Venancio6, Christina Riesselman7, Raj K. Singh8, and the Expedition 383 Scientists*
Mariem Saavedra-Pellitero et al.
  • 1University of Birmingham, School of Geography, Earth and Environmental Sciences, Birmingham, United Kingdom of Great Britain – England, Scotland, Wales (
  • 2School Ocean & Earth Science, National Oceanography Centre, United Kingdom of Great Britain – England, Scotland, Wales (
  • 3Department of Marine Geology, Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research, Germany (
  • 4Department of Geology, Federal University of Rio de Janeiro, Brazil (
  • 5Department of Earth and Environmental Sciences, University of Milano-Bicocca, Italy (
  • 6Center for Weather Forecasting and Climate Research (CPTEC), National Institute for Spacial Research (INPE-Brazil), Brazil (
  • 7Geology Department, University of Otago, New Zealand (
  • 8School of Earth, Ocean and Climate Sciences, Indian Institute of Technology Bhubaneshwar, India (
  • *A full list of authors appears at the end of the abstract

The Antarctic Circumpolar Current (ACC) is a major driver of global climate. It connects all three ocean basins, integrating global climate variability, and its vertical water mass structure plays a key role in oceanic carbon storage. The Atlantic and Indian sectors of the ACC are well studied, but the Pacific sector lacks deep-sea drilling records. Therefore, past water mass transport through the Drake Passage and its effect on Atlantic Meridional Overturning Circulation are not well understood. To fill this gap, IODP Expedition 383 recovered sediments from three sites in the central South Pacific and three sites from the southern Chilean Margin.

Here we present the preliminary biostratigraphy developed during the expedition. The sediments contained abundant nannofossils, foraminifera, radiolarians, diatoms and silicoflagellates which produced age models that were in excellent agreement with the shipboard magnetostratigraphy. Two sites contain high-resolution Pleistocene records, one site goes back to the Pliocene, and two others reach back to the late Miocene. Post-cruise research will further refine these age models through high-resolution bio-, magneto- and oxygen isotope stratigraphies that are currently being generated.

Expedition 383 Scientists:

Frank Lamy, Gisela Winkler, Carlos Alvarez Zarikian, Helge W. Arz, Chandranath Basak, Jesse R. Farmer, Julia Gottschalk, Lisa C. Herbert, Shinya Iwasaki, Vera J. Lawson, Lester Lembke-Jene, Li Lo, Elisabeth M.L. Michel, Jennifer Middleton, Simone Moretti, Christopher M. Moy, Christina Ravelo, Inah Seo, Rebecca A. Smith, Joseph S. Stoner, Sui Wan, Xiangyu Zhao

How to cite: Saavedra-Pellitero, M., Brombacher, A., Esper, O., de Souza, A., Malinverno, E., Venancio, I., Riesselman, C., and Singh, R. K. and the Expedition 383 Scientists: Preliminary biostratigraphy of IODP Expedition 383 sites, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-1818,, 2021.

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