Miocene to present oceanographic variability in the Scotia Sea and Antarctic ice sheets dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382 ...

• Main Authors: Pérez, Lara F., Martos, Yasmina M., García, Marga, Weber, Michael E., Raymo, Maureen E., Williams, Trevor, Bohoyo, Fernando, Armbrecht, Linda, Bailey, Ian, Brachfeld, Stefanie, Glüder, Anna, Guitard, Michelle, Gutjahr, Marcus, Hemming, Sidney, Hernandez-Almeida, Ivan, Hoem, Frida S., Kato, Yuji, O’Connell, Suzanne, Peck, Victoria L., Reilly, Brendan, Ronge, Thomas A., Tauxe, Lisa, Warnock, Jonathan, Zheng, Xufeng, IODP Expedition 382 Scientists
• Format: Text
• Language: English
• Published: ETH Zurich 2021
• Subjects: Drake Passage; Scotia Sea; IODP Expedition 382; oceanic gateways; Antarctic ice sheets evolution; core-log-seismic correlation; Antarctic; Pirie; Antarc*; Ice Sheet
• Online Access: https://dx.doi.org/10.3929/ethz-b-000457285; http://hdl.handle.net/20.500.11850/457285

Scotia Sea and the Drake Passage is key towards understanding the development of modern oceanic circulation patterns and their implications for ice sheet growth and decay. The sedimentary record of the southern Scotia Sea basins documents the regional tectonic, oceanographic and climatic evolution since the Eocene. However, a lack of accurate age estimations has prevented the calibration of the reconstructed history. The upper sedimentary record of the Scotia Sea was scientifically drilled for the first time in 2019 during International Ocean Discovery Program (IODP) Expedition 382, recovering sediments down to ∼643 and 676 m below sea floor in the Dove and Pirie basins respectively. Here, we report newly acquired high resolution physical properties data and the first accurate age constraints for the seismic sequences of the upper sedimentary record of the Scotia Sea to the late Miocene. The drilled record contains four basin-wide reflectors – Reflector-c, -b, -a and -a' previously estimated to be ∼12.6 Ma, ... : Earth and Planetary Science Letters, 553 ...