The Orange River, southern Africa: an extreme example of a wave-dominated sediment dispersal system in the South Atlantic Ocean
Sediments delivered to the South Atlantic Ocean by the Orange River are fractionated and dispersed northwards and westwards by a vigorous longshore drift system and a number of ocean currents. Gravels are accreted to the coastline for a distance >300 km north from the Orange River mouth. Sands ar...
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Geological Society of London
2007
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Online Access: | https://oceanrep.geomar.de/id/eprint/38549/ https://doi.org/10.1144/0016-76492005-189 |
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ftoceanrep:oai:oceanrep.geomar.de:38549 2023-05-15T18:20:53+02:00 The Orange River, southern Africa: an extreme example of a wave-dominated sediment dispersal system in the South Atlantic Ocean Bluck, B.J. Ward, J.D. Cartwright, J. Swart, R. 2007 https://oceanrep.geomar.de/id/eprint/38549/ https://doi.org/10.1144/0016-76492005-189 unknown Geological Society of London Bluck, B. J., Ward, J. D., Cartwright, J. and Swart, R. (2007) The Orange River, southern Africa: an extreme example of a wave-dominated sediment dispersal system in the South Atlantic Ocean. Journal of the Geological Society, 164 (2). pp. 341-351. DOI 10.1144/0016-76492005-189 <https://doi.org/10.1144/0016-76492005-189>. doi:10.1144/0016-76492005-189 info:eu-repo/semantics/closedAccess Article PeerReviewed 2007 ftoceanrep https://doi.org/10.1144/0016-76492005-189 2023-04-07T15:34:16Z Sediments delivered to the South Atlantic Ocean by the Orange River are fractionated and dispersed northwards and westwards by a vigorous longshore drift system and a number of ocean currents. Gravels are accreted to the coastline for a distance >300 km north from the Orange River mouth. Sands are transported alongshore for >700 km but are, in places along this transport path, returned onshore by coastal winds to form the main Namib Sand Sea and other smaller dune fields. Mud is more widely dispersed westwards, northwards and southwards, probably by slow-moving, ocean-scale currents into basins on the shelf and onto the continental shelf edge. This dispersal system, operating since at least Eocene times, is believed to have originated during a time when there was a Late Cretaceous–Early Cenozoic uplift of southern Africa, which resulted in: (1) intensification of the existing southerly wind system; (2) incision of the Orange River, which, coupled with a shift in climate, resulted in a coarsening of its sediment load delivered to the coast; (3) a broad, weakly subsiding or mildly uplifting inner continental shelf with little accommodation space for the sediment load of the incising Orange River. Article in Journal/Newspaper South Atlantic Ocean OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Journal of the Geological Society 164 2 341 351 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
unknown |
description |
Sediments delivered to the South Atlantic Ocean by the Orange River are fractionated and dispersed northwards and westwards by a vigorous longshore drift system and a number of ocean currents. Gravels are accreted to the coastline for a distance >300 km north from the Orange River mouth. Sands are transported alongshore for >700 km but are, in places along this transport path, returned onshore by coastal winds to form the main Namib Sand Sea and other smaller dune fields. Mud is more widely dispersed westwards, northwards and southwards, probably by slow-moving, ocean-scale currents into basins on the shelf and onto the continental shelf edge. This dispersal system, operating since at least Eocene times, is believed to have originated during a time when there was a Late Cretaceous–Early Cenozoic uplift of southern Africa, which resulted in: (1) intensification of the existing southerly wind system; (2) incision of the Orange River, which, coupled with a shift in climate, resulted in a coarsening of its sediment load delivered to the coast; (3) a broad, weakly subsiding or mildly uplifting inner continental shelf with little accommodation space for the sediment load of the incising Orange River. |
format |
Article in Journal/Newspaper |
author |
Bluck, B.J. Ward, J.D. Cartwright, J. Swart, R. |
spellingShingle |
Bluck, B.J. Ward, J.D. Cartwright, J. Swart, R. The Orange River, southern Africa: an extreme example of a wave-dominated sediment dispersal system in the South Atlantic Ocean |
author_facet |
Bluck, B.J. Ward, J.D. Cartwright, J. Swart, R. |
author_sort |
Bluck, B.J. |
title |
The Orange River, southern Africa: an extreme example of a wave-dominated sediment dispersal system in the South Atlantic Ocean |
title_short |
The Orange River, southern Africa: an extreme example of a wave-dominated sediment dispersal system in the South Atlantic Ocean |
title_full |
The Orange River, southern Africa: an extreme example of a wave-dominated sediment dispersal system in the South Atlantic Ocean |
title_fullStr |
The Orange River, southern Africa: an extreme example of a wave-dominated sediment dispersal system in the South Atlantic Ocean |
title_full_unstemmed |
The Orange River, southern Africa: an extreme example of a wave-dominated sediment dispersal system in the South Atlantic Ocean |
title_sort |
orange river, southern africa: an extreme example of a wave-dominated sediment dispersal system in the south atlantic ocean |
publisher |
Geological Society of London |
publishDate |
2007 |
url |
https://oceanrep.geomar.de/id/eprint/38549/ https://doi.org/10.1144/0016-76492005-189 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
Bluck, B. J., Ward, J. D., Cartwright, J. and Swart, R. (2007) The Orange River, southern Africa: an extreme example of a wave-dominated sediment dispersal system in the South Atlantic Ocean. Journal of the Geological Society, 164 (2). pp. 341-351. DOI 10.1144/0016-76492005-189 <https://doi.org/10.1144/0016-76492005-189>. doi:10.1144/0016-76492005-189 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1144/0016-76492005-189 |
container_title |
Journal of the Geological Society |
container_volume |
164 |
container_issue |
2 |
container_start_page |
341 |
op_container_end_page |
351 |
_version_ |
1766199611978940416 |