Seismic evidence for bottom current activity at the Agulhas Ridge
The South Atlantic is a region where water masses from the Atlantic andIndian Oceans meet Antarctic water masses.The Agulhas Ridge in the eastern South Atlantic is a pronouncedelevation of the ocean bottom which witnessed major changes inoceanic circulation since the Cretaceous.It has acted as a bar...
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ftawi:oai:epic.awi.de:3670 2024-09-15T17:47:43+00:00 Seismic evidence for bottom current activity at the Agulhas Ridge Wildeboer Schut, E. Uenzelmann-Neben, Gabriele Gersonde, Rainer 2002 application/pdf https://epic.awi.de/id/eprint/3670/ https://epic.awi.de/id/eprint/3670/1/Wil2000a.pdf https://hdl.handle.net/10013/epic.14247 https://hdl.handle.net/10013/epic.14247.d001 unknown https://epic.awi.de/id/eprint/3670/1/Wil2000a.pdf https://hdl.handle.net/10013/epic.14247.d001 Wildeboer Schut, E. , Uenzelmann-Neben, G. orcid:0000-0002-0115-5923 and Gersonde, R. (2002) Seismic evidence for bottom current activity at the Agulhas Ridge , Global and Planetary Change, 34 , pp. 185-198 . hdl:10013/epic.14247 EPIC3Global and Planetary Change, 34, pp. 185-198 Article isiRev 2002 ftawi 2024-06-24T03:54:11Z The South Atlantic is a region where water masses from the Atlantic andIndian Oceans meet Antarctic water masses.The Agulhas Ridge in the eastern South Atlantic is a pronouncedelevation of the ocean bottom which witnessed major changes inoceanic circulation since the Cretaceous.It has acted as a barrier for deep oceanic currents of Atlantic originlike the North Atlantic Deep Water (NADW) and Antarctic origin like theAntarctic Bottom Water (AABW), or water masses derived from AABW such asCircumpolar Deep Water (CDW).The history of these currents is recorded in the sedimentary sequencein the adjacent Cape and Agulhas Basins.Seismic profiles over the Agulhas Ridge show sediment packagesin the Cape Basin which are identified as contourite sheets.These consist of thick, seismically predominantly low reflectivesequences interrupted by widespread hiatuses.ODP Leg 177 cores date hiatuses linked with widespread discontinuitiesin the Early Oligocene, the Middle Miocene, around the Miocene/Plioceneboundary and in the early Pleistocene.These hiatuses are clear markers inside contourite drift bodies and thisis used to date an elongate contourite drift in the Cape Basin.This drift shows sediments deposited by a westward current, implicatingthat the bottom current in the Oligocene followed the same trajectory aspresent-day CDW does. Article in Journal/Newspaper Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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The South Atlantic is a region where water masses from the Atlantic andIndian Oceans meet Antarctic water masses.The Agulhas Ridge in the eastern South Atlantic is a pronouncedelevation of the ocean bottom which witnessed major changes inoceanic circulation since the Cretaceous.It has acted as a barrier for deep oceanic currents of Atlantic originlike the North Atlantic Deep Water (NADW) and Antarctic origin like theAntarctic Bottom Water (AABW), or water masses derived from AABW such asCircumpolar Deep Water (CDW).The history of these currents is recorded in the sedimentary sequencein the adjacent Cape and Agulhas Basins.Seismic profiles over the Agulhas Ridge show sediment packagesin the Cape Basin which are identified as contourite sheets.These consist of thick, seismically predominantly low reflectivesequences interrupted by widespread hiatuses.ODP Leg 177 cores date hiatuses linked with widespread discontinuitiesin the Early Oligocene, the Middle Miocene, around the Miocene/Plioceneboundary and in the early Pleistocene.These hiatuses are clear markers inside contourite drift bodies and thisis used to date an elongate contourite drift in the Cape Basin.This drift shows sediments deposited by a westward current, implicatingthat the bottom current in the Oligocene followed the same trajectory aspresent-day CDW does. |
format |
Article in Journal/Newspaper |
author |
Wildeboer Schut, E. Uenzelmann-Neben, Gabriele Gersonde, Rainer |
spellingShingle |
Wildeboer Schut, E. Uenzelmann-Neben, Gabriele Gersonde, Rainer Seismic evidence for bottom current activity at the Agulhas Ridge |
author_facet |
Wildeboer Schut, E. Uenzelmann-Neben, Gabriele Gersonde, Rainer |
author_sort |
Wildeboer Schut, E. |
title |
Seismic evidence for bottom current activity at the Agulhas Ridge |
title_short |
Seismic evidence for bottom current activity at the Agulhas Ridge |
title_full |
Seismic evidence for bottom current activity at the Agulhas Ridge |
title_fullStr |
Seismic evidence for bottom current activity at the Agulhas Ridge |
title_full_unstemmed |
Seismic evidence for bottom current activity at the Agulhas Ridge |
title_sort |
seismic evidence for bottom current activity at the agulhas ridge |
publishDate |
2002 |
url |
https://epic.awi.de/id/eprint/3670/ https://epic.awi.de/id/eprint/3670/1/Wil2000a.pdf https://hdl.handle.net/10013/epic.14247 https://hdl.handle.net/10013/epic.14247.d001 |
genre |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
op_source |
EPIC3Global and Planetary Change, 34, pp. 185-198 |
op_relation |
https://epic.awi.de/id/eprint/3670/1/Wil2000a.pdf https://hdl.handle.net/10013/epic.14247.d001 Wildeboer Schut, E. , Uenzelmann-Neben, G. orcid:0000-0002-0115-5923 and Gersonde, R. (2002) Seismic evidence for bottom current activity at the Agulhas Ridge , Global and Planetary Change, 34 , pp. 185-198 . hdl:10013/epic.14247 |
_version_ |
1810497195645861888 |