Greater supply of Patagonian-sourced detritus and transport by the ACC to the Atlantic sector of the Southern Ocean during the last glacial period

Reconstructing past detrital flux and provenance in the SouthernOcean provides information about changes in source regions associated with climate variations and transport pathways. We present a LastGlacial Maximum (LGM) to Holocene comparison of 230Th normalised fluxes combined with sediment proven...

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Published in:Earth and Planetary Science Letters
Main Authors: Noble, T, Piotrowski, AM, Robinson, LF, McManus, JF, Hillenbrand, C-D, Bory, AJ-M
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier Science Bv 2012
Subjects:
Online Access:https://doi.org/10.1016/j.epsl.2011.10.007
http://ecite.utas.edu.au/80318
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spelling ftunivtasecite:oai:ecite.utas.edu.au:80318 2023-05-15T14:02:30+02:00 Greater supply of Patagonian-sourced detritus and transport by the ACC to the Atlantic sector of the Southern Ocean during the last glacial period Noble, T Piotrowski, AM Robinson, LF McManus, JF Hillenbrand, C-D Bory, AJ-M 2012 https://doi.org/10.1016/j.epsl.2011.10.007 http://ecite.utas.edu.au/80318 en eng Elsevier Science Bv http://dx.doi.org/10.1016/j.epsl.2011.10.007 Noble, T and Piotrowski, AM and Robinson, LF and McManus, JF and Hillenbrand, C-D and Bory, AJ-M, Greater supply of Patagonian-sourced detritus and transport by the ACC to the Atlantic sector of the Southern Ocean during the last glacial period, Earth and Planetary Science Letters, 317-318, (1) pp. 374-385. ISSN 0012-821X (2012) [Refereed Article] http://ecite.utas.edu.au/80318 Earth Sciences Oceanography Chemical Oceanography Refereed Article PeerReviewed 2012 ftunivtasecite https://doi.org/10.1016/j.epsl.2011.10.007 2019-12-13T21:45:41Z Reconstructing past detrital flux and provenance in the SouthernOcean provides information about changes in source regions associated with climate variations and transport pathways. We present a LastGlacial Maximum (LGM) to Holocene comparison of 230Th normalised fluxes combined with sediment provenance data (Pb, Nd and Sr isotopes) from a latitudinal core transect in the eastern Atlanticsector of the SouthernOcean (ODP Leg 177 cores). We compare the radiogenic isotopic composition (IC) of detritus in these cores to that of cores proximal to potential source areas.We observe a well-defined latitudinal Holocene gradient in both detrital flux and provenance of sediment. High detrital fluxes in the north are associated with terrigenous material derived from southern Africa, while low detrital fluxes in the south are associated with supply from southern South America, West Antarctica and the South Sandwich Islands. The data suggest that this well-defined Holocene gradient in detrital flux and sediment provenance is controlled by the flow of the Antarctic Circumpolar Current (ACC) and the position of its frontal zones. The LGM is characterised by 2 to 6 times higher than modern detrital fluxes at most ODP Leg 177 sites. The LGM detrital fluxes do not show a latitudinal trend and suggest a greatersupply of glaciogenic detritussourced from southern South America. GlacialPatagonian outwash sediments (< 5 μm fraction) were analysed and compared to the bulk compositions of the marine sediments. The Pb IC of the Patagonian sediments is very similar to the glacial IC of sediments in the Scotia Sea and at ~ 49 S latitude in the eastern Atlanticsector. We propose that the glacial IC of sediments is controlled by increased delivery of Patagoniandetritus initially supplied by glaciers and then transported at depth via the ACC. Article in Journal/Newspaper Antarc* Antarctic Antarctica Scotia Sea South Sandwich Islands Southern Ocean West Antarctica eCite UTAS (University of Tasmania) Antarctic Southern Ocean The Antarctic West Antarctica Scotia Sea Sandwich Islands South Sandwich Islands Earth and Planetary Science Letters 317-318 374 385
institution Open Polar
collection eCite UTAS (University of Tasmania)
op_collection_id ftunivtasecite
language English
topic Earth Sciences
Oceanography
Chemical Oceanography
spellingShingle Earth Sciences
Oceanography
Chemical Oceanography
Noble, T
Piotrowski, AM
Robinson, LF
McManus, JF
Hillenbrand, C-D
Bory, AJ-M
Greater supply of Patagonian-sourced detritus and transport by the ACC to the Atlantic sector of the Southern Ocean during the last glacial period
topic_facet Earth Sciences
Oceanography
Chemical Oceanography
description Reconstructing past detrital flux and provenance in the SouthernOcean provides information about changes in source regions associated with climate variations and transport pathways. We present a LastGlacial Maximum (LGM) to Holocene comparison of 230Th normalised fluxes combined with sediment provenance data (Pb, Nd and Sr isotopes) from a latitudinal core transect in the eastern Atlanticsector of the SouthernOcean (ODP Leg 177 cores). We compare the radiogenic isotopic composition (IC) of detritus in these cores to that of cores proximal to potential source areas.We observe a well-defined latitudinal Holocene gradient in both detrital flux and provenance of sediment. High detrital fluxes in the north are associated with terrigenous material derived from southern Africa, while low detrital fluxes in the south are associated with supply from southern South America, West Antarctica and the South Sandwich Islands. The data suggest that this well-defined Holocene gradient in detrital flux and sediment provenance is controlled by the flow of the Antarctic Circumpolar Current (ACC) and the position of its frontal zones. The LGM is characterised by 2 to 6 times higher than modern detrital fluxes at most ODP Leg 177 sites. The LGM detrital fluxes do not show a latitudinal trend and suggest a greatersupply of glaciogenic detritussourced from southern South America. GlacialPatagonian outwash sediments (< 5 μm fraction) were analysed and compared to the bulk compositions of the marine sediments. The Pb IC of the Patagonian sediments is very similar to the glacial IC of sediments in the Scotia Sea and at ~ 49 S latitude in the eastern Atlanticsector. We propose that the glacial IC of sediments is controlled by increased delivery of Patagoniandetritus initially supplied by glaciers and then transported at depth via the ACC.
format Article in Journal/Newspaper
author Noble, T
Piotrowski, AM
Robinson, LF
McManus, JF
Hillenbrand, C-D
Bory, AJ-M
author_facet Noble, T
Piotrowski, AM
Robinson, LF
McManus, JF
Hillenbrand, C-D
Bory, AJ-M
author_sort Noble, T
title Greater supply of Patagonian-sourced detritus and transport by the ACC to the Atlantic sector of the Southern Ocean during the last glacial period
title_short Greater supply of Patagonian-sourced detritus and transport by the ACC to the Atlantic sector of the Southern Ocean during the last glacial period
title_full Greater supply of Patagonian-sourced detritus and transport by the ACC to the Atlantic sector of the Southern Ocean during the last glacial period
title_fullStr Greater supply of Patagonian-sourced detritus and transport by the ACC to the Atlantic sector of the Southern Ocean during the last glacial period
title_full_unstemmed Greater supply of Patagonian-sourced detritus and transport by the ACC to the Atlantic sector of the Southern Ocean during the last glacial period
title_sort greater supply of patagonian-sourced detritus and transport by the acc to the atlantic sector of the southern ocean during the last glacial period
publisher Elsevier Science Bv
publishDate 2012
url https://doi.org/10.1016/j.epsl.2011.10.007
http://ecite.utas.edu.au/80318
geographic Antarctic
Southern Ocean
The Antarctic
West Antarctica
Scotia Sea
Sandwich Islands
South Sandwich Islands
geographic_facet Antarctic
Southern Ocean
The Antarctic
West Antarctica
Scotia Sea
Sandwich Islands
South Sandwich Islands
genre Antarc*
Antarctic
Antarctica
Scotia Sea
South Sandwich Islands
Southern Ocean
West Antarctica
genre_facet Antarc*
Antarctic
Antarctica
Scotia Sea
South Sandwich Islands
Southern Ocean
West Antarctica
op_relation http://dx.doi.org/10.1016/j.epsl.2011.10.007
Noble, T and Piotrowski, AM and Robinson, LF and McManus, JF and Hillenbrand, C-D and Bory, AJ-M, Greater supply of Patagonian-sourced detritus and transport by the ACC to the Atlantic sector of the Southern Ocean during the last glacial period, Earth and Planetary Science Letters, 317-318, (1) pp. 374-385. ISSN 0012-821X (2012) [Refereed Article]
http://ecite.utas.edu.au/80318
op_doi https://doi.org/10.1016/j.epsl.2011.10.007
container_title Earth and Planetary Science Letters
container_volume 317-318
container_start_page 374
op_container_end_page 385
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