Millennial-scale depositional cycles related to British Ice Sheet variability and North Atlantic paleocirculation since 45 kyr BP, Barra Fan, UK margin
Lithology, lithic petrology, planktonic foraminiferal abundances, and elastic grain sizes have been determined in a 30 m-long core recovered from the Barra Fan off northwest Scotland. The record extends back to around 45 kyr B.P., with sedimentation rates ranging between 50 and 200 cm/kyr. The abund...
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Amer Geophysical Union
2001
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Online Access: | https://doi.org/10.1029/1999PA000483 https://archimer.ifremer.fr/doc/00220/33174/31680.pdf https://archimer.ifremer.fr/doc/00220/33174/ |
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fttriple:oai:gotriple.eu:10670/1.ypnjk3 2023-05-15T16:40:21+02:00 Millennial-scale depositional cycles related to British Ice Sheet variability and North Atlantic paleocirculation since 45 kyr BP, Barra Fan, UK margin Knutz, Pc Austin, Wen Jones, Ejw 2001-01-01 https://doi.org/10.1029/1999PA000483 https://archimer.ifremer.fr/doc/00220/33174/31680.pdf https://archimer.ifremer.fr/doc/00220/33174/ en eng Amer Geophysical Union doi:10.1029/1999PA000483 10670/1.ypnjk3 https://archimer.ifremer.fr/doc/00220/33174/31680.pdf https://archimer.ifremer.fr/doc/00220/33174/ other Archimer, archive institutionnelle de l'Ifremer Paleoceanography (0883-8305) (Amer Geophysical Union), 2001-02 , Vol. 16 , N. 1 , P. 53-64 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2001 fttriple https://doi.org/10.1029/1999PA000483 2023-01-22T18:39:55Z Lithology, lithic petrology, planktonic foraminiferal abundances, and elastic grain sizes have been determined in a 30 m-long core recovered from the Barra Fan off northwest Scotland. The record extends back to around 45 kyr B.P., with sedimentation rates ranging between 50 and 200 cm/kyr. The abundance of ice-rafted debris indicates 16 glacimarine events, including temporal equivalents to Heinrich events 1-4. Enhanced concentrations of basaltic material derived from the British Tertiary Province suggest that the glacimarine sediments record variations in a glacial source on the Hebrides shelf margin. Glacimarine zones are separated by silty intervals with high planktonic foraminifera concentrations that reflect an interstadial circulation regime in the Rockall Trough. The results suggest that the last British Ice Sheet fluctuated with a periodicity of 2000-3000 years, in common with the Dansgaard-Oeschger climate cycle. Text Ice Sheet North Atlantic Planktonic foraminifera Unknown Barra ENVELOPE(-61.417,-61.417,-64.367,-64.367) Rockall Trough ENVELOPE(-15.036,-15.036,53.825,53.825) Paleoceanography 16 1 53 64 |
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language |
English |
topic |
geo envir |
spellingShingle |
geo envir Knutz, Pc Austin, Wen Jones, Ejw Millennial-scale depositional cycles related to British Ice Sheet variability and North Atlantic paleocirculation since 45 kyr BP, Barra Fan, UK margin |
topic_facet |
geo envir |
description |
Lithology, lithic petrology, planktonic foraminiferal abundances, and elastic grain sizes have been determined in a 30 m-long core recovered from the Barra Fan off northwest Scotland. The record extends back to around 45 kyr B.P., with sedimentation rates ranging between 50 and 200 cm/kyr. The abundance of ice-rafted debris indicates 16 glacimarine events, including temporal equivalents to Heinrich events 1-4. Enhanced concentrations of basaltic material derived from the British Tertiary Province suggest that the glacimarine sediments record variations in a glacial source on the Hebrides shelf margin. Glacimarine zones are separated by silty intervals with high planktonic foraminifera concentrations that reflect an interstadial circulation regime in the Rockall Trough. The results suggest that the last British Ice Sheet fluctuated with a periodicity of 2000-3000 years, in common with the Dansgaard-Oeschger climate cycle. |
format |
Text |
author |
Knutz, Pc Austin, Wen Jones, Ejw |
author_facet |
Knutz, Pc Austin, Wen Jones, Ejw |
author_sort |
Knutz, Pc |
title |
Millennial-scale depositional cycles related to British Ice Sheet variability and North Atlantic paleocirculation since 45 kyr BP, Barra Fan, UK margin |
title_short |
Millennial-scale depositional cycles related to British Ice Sheet variability and North Atlantic paleocirculation since 45 kyr BP, Barra Fan, UK margin |
title_full |
Millennial-scale depositional cycles related to British Ice Sheet variability and North Atlantic paleocirculation since 45 kyr BP, Barra Fan, UK margin |
title_fullStr |
Millennial-scale depositional cycles related to British Ice Sheet variability and North Atlantic paleocirculation since 45 kyr BP, Barra Fan, UK margin |
title_full_unstemmed |
Millennial-scale depositional cycles related to British Ice Sheet variability and North Atlantic paleocirculation since 45 kyr BP, Barra Fan, UK margin |
title_sort |
millennial-scale depositional cycles related to british ice sheet variability and north atlantic paleocirculation since 45 kyr bp, barra fan, uk margin |
publisher |
Amer Geophysical Union |
publishDate |
2001 |
url |
https://doi.org/10.1029/1999PA000483 https://archimer.ifremer.fr/doc/00220/33174/31680.pdf https://archimer.ifremer.fr/doc/00220/33174/ |
long_lat |
ENVELOPE(-61.417,-61.417,-64.367,-64.367) ENVELOPE(-15.036,-15.036,53.825,53.825) |
geographic |
Barra Rockall Trough |
geographic_facet |
Barra Rockall Trough |
genre |
Ice Sheet North Atlantic Planktonic foraminifera |
genre_facet |
Ice Sheet North Atlantic Planktonic foraminifera |
op_source |
Archimer, archive institutionnelle de l'Ifremer Paleoceanography (0883-8305) (Amer Geophysical Union), 2001-02 , Vol. 16 , N. 1 , P. 53-64 |
op_relation |
doi:10.1029/1999PA000483 10670/1.ypnjk3 https://archimer.ifremer.fr/doc/00220/33174/31680.pdf https://archimer.ifremer.fr/doc/00220/33174/ |
op_rights |
other |
op_doi |
https://doi.org/10.1029/1999PA000483 |
container_title |
Paleoceanography |
container_volume |
16 |
container_issue |
1 |
container_start_page |
53 |
op_container_end_page |
64 |
_version_ |
1766030736829186048 |