Contourite sedimentation in the Falkland Trough, western South Atlantic
The Falkland Trough is a west-east bathymetric deep that separates the Falkland Plateau from the North Scotia Ridge in the western South Atlantic. It lies in the path of Circumpolar Deep Water flowing within the Antarctic Circumpolar Current (ACC), and Weddell Sea Deep Water flowing beneath the ACC...
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Geological Society of London
2002
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ftnerc:oai:nora.nerc.ac.uk:13258 2023-05-15T13:45:11+02:00 Contourite sedimentation in the Falkland Trough, western South Atlantic Cunningham, Alex P. Howe, John A. Barker, Peter F. Stow, D.A.V. Pudsey, C.J. Howe, J.A. Faugères, J.-C. Viana, A.R. 2002 http://nora.nerc.ac.uk/id/eprint/13258/ unknown Geological Society of London Cunningham, Alex P.; Howe, John A.; Barker, Peter F. 2002 Contourite sedimentation in the Falkland Trough, western South Atlantic. 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, 337-352. (Geological Society Memoir, 22). Marine Sciences Earth Sciences Publication - Book Section NonPeerReviewed 2002 ftnerc 2023-02-04T19:28:30Z The Falkland Trough is a west-east bathymetric deep that separates the Falkland Plateau from the North Scotia Ridge in the western South Atlantic. It lies in the path of Circumpolar Deep Water flowing within the Antarctic Circumpolar Current (ACC), and Weddell Sea Deep Water flowing beneath the ACC east of Shag Rocks passage. Marine geophysical and sediment core data demonstrate the influence of ambient bottom currents on deposition in this area, and reveal two styles of contourite sedimentation: (1) deposition of glauconite-rich sandy contourites in exposed areas of the Falkland Plateau and Falkland Trough, where vigorous ACC bottom currents control sedimentation, and (2) deposition of biogenic sandy contourites, muddy contourites and hemipelagites (western Falkland Trough), and muddy diatom ooze (eastern Falkland Trough), in the form of two elongate sediment drifts, which have developed in the presence of more sluggish bottom currents. The drift sediments contain a depositional record of bottom current flow through the glacial cycle (southern-origin bottom water flow in the east, and probably ACC flow in the west); analyses of core data from the western Falkland Trough suggest a reduction in bottom current strength during the Last Glacial Maximum at present depths of > 2500 m below sea level. Book Part Antarc* Antarctic Weddell Sea Natural Environment Research Council: NERC Open Research Archive Antarctic Falkland Plateau ENVELOPE(-50.000,-50.000,-51.000,-51.000) Falkland Trough ENVELOPE(-49.750,-49.750,-52.750,-52.750) North Scotia Ridge ENVELOPE(-51.431,-51.431,-53.581,-53.581) Shag Rocks ENVELOPE(-42.033,-42.033,-53.550,-53.550) The Antarctic Weddell Weddell Sea |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Marine Sciences Earth Sciences |
spellingShingle |
Marine Sciences Earth Sciences Cunningham, Alex P. Howe, John A. Barker, Peter F. Contourite sedimentation in the Falkland Trough, western South Atlantic |
topic_facet |
Marine Sciences Earth Sciences |
description |
The Falkland Trough is a west-east bathymetric deep that separates the Falkland Plateau from the North Scotia Ridge in the western South Atlantic. It lies in the path of Circumpolar Deep Water flowing within the Antarctic Circumpolar Current (ACC), and Weddell Sea Deep Water flowing beneath the ACC east of Shag Rocks passage. Marine geophysical and sediment core data demonstrate the influence of ambient bottom currents on deposition in this area, and reveal two styles of contourite sedimentation: (1) deposition of glauconite-rich sandy contourites in exposed areas of the Falkland Plateau and Falkland Trough, where vigorous ACC bottom currents control sedimentation, and (2) deposition of biogenic sandy contourites, muddy contourites and hemipelagites (western Falkland Trough), and muddy diatom ooze (eastern Falkland Trough), in the form of two elongate sediment drifts, which have developed in the presence of more sluggish bottom currents. The drift sediments contain a depositional record of bottom current flow through the glacial cycle (southern-origin bottom water flow in the east, and probably ACC flow in the west); analyses of core data from the western Falkland Trough suggest a reduction in bottom current strength during the Last Glacial Maximum at present depths of > 2500 m below sea level. |
author2 |
Stow, D.A.V. Pudsey, C.J. Howe, J.A. Faugères, J.-C. Viana, A.R. |
format |
Book Part |
author |
Cunningham, Alex P. Howe, John A. Barker, Peter F. |
author_facet |
Cunningham, Alex P. Howe, John A. Barker, Peter F. |
author_sort |
Cunningham, Alex P. |
title |
Contourite sedimentation in the Falkland Trough, western South Atlantic |
title_short |
Contourite sedimentation in the Falkland Trough, western South Atlantic |
title_full |
Contourite sedimentation in the Falkland Trough, western South Atlantic |
title_fullStr |
Contourite sedimentation in the Falkland Trough, western South Atlantic |
title_full_unstemmed |
Contourite sedimentation in the Falkland Trough, western South Atlantic |
title_sort |
contourite sedimentation in the falkland trough, western south atlantic |
publisher |
Geological Society of London |
publishDate |
2002 |
url |
http://nora.nerc.ac.uk/id/eprint/13258/ |
long_lat |
ENVELOPE(-50.000,-50.000,-51.000,-51.000) ENVELOPE(-49.750,-49.750,-52.750,-52.750) ENVELOPE(-51.431,-51.431,-53.581,-53.581) ENVELOPE(-42.033,-42.033,-53.550,-53.550) |
geographic |
Antarctic Falkland Plateau Falkland Trough North Scotia Ridge Shag Rocks The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Falkland Plateau Falkland Trough North Scotia Ridge Shag Rocks The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Weddell Sea |
genre_facet |
Antarc* Antarctic Weddell Sea |
op_relation |
Cunningham, Alex P.; Howe, John A.; Barker, Peter F. 2002 Contourite sedimentation in the Falkland Trough, western South Atlantic. 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, 337-352. (Geological Society Memoir, 22). |
_version_ |
1766215420025503744 |