Continental shelf drift deposit indicates non-steady state Antarctic bottom water production in the Holocene
A late Quaternary, current-lain sediment drift deposit over 30 m in thickness has been discovered on the continental shelf of East Antarctica in an 850 m deep glacial trough off George Vth Land. Radiocarbon dating indicates that a period of rapid deposition on the drift (averaging 290 cm/kyr) occurr...
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Online Access: | https://doi.org/10.1016/S0025-3227(01)00183-9 http://ecite.utas.edu.au/22206 |
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ftunivtasecite:oai:ecite.utas.edu.au:22206 2023-05-15T13:59:07+02:00 Continental shelf drift deposit indicates non-steady state Antarctic bottom water production in the Holocene Harris, PT Brancolini, G Armand, LK Busetti, M Beaman, RJ Giorgetti, G Presti, M Trincardi, F 2001 https://doi.org/10.1016/S0025-3227(01)00183-9 http://ecite.utas.edu.au/22206 en eng Elsevier Science BV http://dx.doi.org/10.1016/S0025-3227(01)00183-9 Harris, PT and Brancolini, G and Armand, LK and Busetti, M and Beaman, RJ and Giorgetti, G and Presti, M and Trincardi, F, Continental shelf drift deposit indicates non-steady state Antarctic bottom water production in the Holocene, Marine Geology, 179, (1-2) pp. 1-8. ISSN 0025-3227 (2001) [Refereed Article] http://ecite.utas.edu.au/22206 Earth Sciences Geology Sedimentology Refereed Article PeerReviewed 2001 ftunivtasecite https://doi.org/10.1016/S0025-3227(01)00183-9 2019-12-13T21:04:12Z A late Quaternary, current-lain sediment drift deposit over 30 m in thickness has been discovered on the continental shelf of East Antarctica in an 850 m deep glacial trough off George Vth Land. Radiocarbon dating indicates that a period of rapid deposition on the drift (averaging 290 cm/kyr) occurred in the mid-Holocene, between about 3000 and 5000 yr before present (yr BP). Slower deposition rates of around 10 cm/kyr, during the past 0-3000 yr and from 5000 to about 13000 yr BP, coincides with the deposition of bioturbated, ice-rafted debris (IRD) rich, sandy mud under an energetic bottom current regime. In contrast, the mid-Holocene (3000-5000 yr BP) sediments are fine-grained, laminated to cross-laminated with minimal IRD content, and are contemporaneous with a period of warmer marine conditions with less sea ice production. This pattern suggests that bottom currents were weaker than present day in the mid-Holocene, and that the rate of dense bottom water production was reduced at that time. This scenario is consistent with the hypothesis of non-steady state rates of Antarctic bottom water production through the Holocene as recently proposed by Broecker and his colleagues. 2001 Elsevier Science B.V. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Sea ice eCite UTAS (University of Tasmania) Antarctic East Antarctica Marine Geology 179 1-2 1 8 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geology Sedimentology |
spellingShingle |
Earth Sciences Geology Sedimentology Harris, PT Brancolini, G Armand, LK Busetti, M Beaman, RJ Giorgetti, G Presti, M Trincardi, F Continental shelf drift deposit indicates non-steady state Antarctic bottom water production in the Holocene |
topic_facet |
Earth Sciences Geology Sedimentology |
description |
A late Quaternary, current-lain sediment drift deposit over 30 m in thickness has been discovered on the continental shelf of East Antarctica in an 850 m deep glacial trough off George Vth Land. Radiocarbon dating indicates that a period of rapid deposition on the drift (averaging 290 cm/kyr) occurred in the mid-Holocene, between about 3000 and 5000 yr before present (yr BP). Slower deposition rates of around 10 cm/kyr, during the past 0-3000 yr and from 5000 to about 13000 yr BP, coincides with the deposition of bioturbated, ice-rafted debris (IRD) rich, sandy mud under an energetic bottom current regime. In contrast, the mid-Holocene (3000-5000 yr BP) sediments are fine-grained, laminated to cross-laminated with minimal IRD content, and are contemporaneous with a period of warmer marine conditions with less sea ice production. This pattern suggests that bottom currents were weaker than present day in the mid-Holocene, and that the rate of dense bottom water production was reduced at that time. This scenario is consistent with the hypothesis of non-steady state rates of Antarctic bottom water production through the Holocene as recently proposed by Broecker and his colleagues. 2001 Elsevier Science B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Harris, PT Brancolini, G Armand, LK Busetti, M Beaman, RJ Giorgetti, G Presti, M Trincardi, F |
author_facet |
Harris, PT Brancolini, G Armand, LK Busetti, M Beaman, RJ Giorgetti, G Presti, M Trincardi, F |
author_sort |
Harris, PT |
title |
Continental shelf drift deposit indicates non-steady state Antarctic bottom water production in the Holocene |
title_short |
Continental shelf drift deposit indicates non-steady state Antarctic bottom water production in the Holocene |
title_full |
Continental shelf drift deposit indicates non-steady state Antarctic bottom water production in the Holocene |
title_fullStr |
Continental shelf drift deposit indicates non-steady state Antarctic bottom water production in the Holocene |
title_full_unstemmed |
Continental shelf drift deposit indicates non-steady state Antarctic bottom water production in the Holocene |
title_sort |
continental shelf drift deposit indicates non-steady state antarctic bottom water production in the holocene |
publisher |
Elsevier Science BV |
publishDate |
2001 |
url |
https://doi.org/10.1016/S0025-3227(01)00183-9 http://ecite.utas.edu.au/22206 |
geographic |
Antarctic East Antarctica |
geographic_facet |
Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Sea ice |
op_relation |
http://dx.doi.org/10.1016/S0025-3227(01)00183-9 Harris, PT and Brancolini, G and Armand, LK and Busetti, M and Beaman, RJ and Giorgetti, G and Presti, M and Trincardi, F, Continental shelf drift deposit indicates non-steady state Antarctic bottom water production in the Holocene, Marine Geology, 179, (1-2) pp. 1-8. ISSN 0025-3227 (2001) [Refereed Article] http://ecite.utas.edu.au/22206 |
op_doi |
https://doi.org/10.1016/S0025-3227(01)00183-9 |
container_title |
Marine Geology |
container_volume |
179 |
container_issue |
1-2 |
container_start_page |
1 |
op_container_end_page |
8 |
_version_ |
1766267512400379904 |