Mixed biosiliceous-terrigenous sedimentation under the Antarctic Circumpolar Current, Scotia Sea

Sediment supply to the Scotia Sea is controlled by the east-flowing Antarctic Circumpolar Current (ACC) with some Weddell Gyre influence in the south. Near-bottom flow is unsteady with frequent changes in flow direction and episodic benthic storms. Near the North Scotia Ridge, mounds of sediment up...

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Bibliographic Details
Main Authors: Pudsey, Carol J., Howe, John A.
Other Authors: Stow, D.A.V., Pudsey, C.J., Howe, J.A., Faugères, J.-C., Viana, A.R.
Format: Book Part
Language:unknown
Published: Geological Society of London 2002
Subjects:
Marine Sciences
Earth Sciences
Antarctic
The Antarctic
Scotia Sea
Weddell
North Scotia Ridge
Antarc*
Online Access:http://nora.nerc.ac.uk/id/eprint/14170/
Description
Summary:Sediment supply to the Scotia Sea is controlled by the east-flowing Antarctic Circumpolar Current (ACC) with some Weddell Gyre influence in the south. Near-bottom flow is unsteady with frequent changes in flow direction and episodic benthic storms. Near the North Scotia Ridge, mounds of sediment up to 1 km thick have accumulated on lower Miocene ocean floor. The basins farther south contain up to 2 km of sediment which is flat-lying or draped rather than mounded. Sediment cores exhibit a biogenic-terrigenous cyclicity related to glacial-interglacial cycles. Grain-size data suggest that ACC flow was stronger during glacials than interglacials.

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