Amundsen Sea sediment drifts: Archives of modifications in oceanographic and climatic conditions
In: Marine Geology. Elsevier: Amsterdam. ISSN 0025-3227; e-ISSN 1872-6151, more
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| Keywords |
Sedimentary structures > Bed forms > Sediment drifts
Water > Bottom water
Antarctica [Marine Regions]; PSW, Amundsen Sea
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| Author keywords |
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| Authors | | Top |
- Uenzelmann-Neben, G.
- Gohl, K.
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| Abstract |
Drift deposits document stages of particular dynamic bottom-currents and associated sedimentary transport activities. The analysis of seismic reflection data from the Amundsen Sea, southern 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 ~ 4 Ma. |
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