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

Pudsey, Carol J.; Howe, John A.. 2002 Mixed biosiliceous-terrigenous sedimentation under the Antarctic Circumpolar Current, Scotia Sea. In: Stow, D.A.V.; Pudsey, C.J.; Howe, J.A.; Faugères, J.-C.; Viana, A.R., (eds.) Deep-water contourite systems: modern drifts and ancient series, seismic and sedimentary characteristics. London, Geological Society of London, 325-336. (Geological Society Memoir, 22).

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Abstract/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.

Item Type: Publication - Book Section
Programmes: BAS Programmes > Other
ISBN: 1862390924
NORA Subject Terms: Marine Sciences
Earth Sciences
Date made live: 14 Mar 2012 11:07
URI: http://nora.nerc.ac.uk/id/eprint/14170

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