Journal
MARINE GEOLOGY
Volume 299, Issue -, Pages 51-62Publisher
ELSEVIER
DOI: 10.1016/j.margeo.2011.12.007
Keywords
Amundsen Sea; Antarctica; Sediment drifts; Seismic reflection data; Bottom water
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Funding
- RV Polarstern cruises [ANT-XI/3, ANT-XXIII/4]
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Drift deposits document stages of particular dynamic bottom-currents and associated sedimentary transport activities. The analysis of seismic reflection data from the Amundsen Sea, southem Pacific Ocean, reveals sediment drift formation already in Eocene/Oligocene times. This observation indicates bottom current activity and hence a cold climate for the late Palaeogene in an area, which today lies under the influence of Antarctic Bottom Water (AABW) originating in the Ross Sea. The generation of sediment drifts is accompanied by the occurrence of mass transport deposits leading to the identification of a phase of strong ice sheet expansion (15-4 Ma), which due to a change in ice regime from wet- to dry-based was followed by less material input during the last similar to 4 Ma. (C) 2012 Elsevier B.V. All rights reserved.
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