Magnetic signature of European margin sediments:Provenance of ice-rafted debris and the climatic response of the British ice sheet during Marine Isotope Stages 2 and 3
Mineral magnetic measurements are used to distinguish ice-rafted debris (IRD) sources and climate cycles spanning Marine Isotope Stage (MIS) 3 and MIS2 in core MD95-2006, from the Barra Fan, NE Atlantic. Distinct magnetic properties are displayed by IRD from the Laurentide ice sheet (LIS) (high susc...
Published in: | Journal of Geophysical Research |
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Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2008
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/magnetic-signature-of-european-margin-sediments(a3f012a6-e393-4716-8d57-90f4b189ec76).html https://doi.org/10.1029/2007JF000836 http://www.scopus.com/inward/record.url?scp=56649103660&partnerID=8YFLogxK |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/a3f012a6-e393-4716-8d57-90f4b189ec76 2023-05-15T16:28:19+02:00 Magnetic signature of European margin sediments:Provenance of ice-rafted debris and the climatic response of the British ice sheet during Marine Isotope Stages 2 and 3 Peters, Clare Walden, John Austin, William 2008-07-24 https://risweb.st-andrews.ac.uk/portal/en/researchoutput/magnetic-signature-of-european-margin-sediments(a3f012a6-e393-4716-8d57-90f4b189ec76).html https://doi.org/10.1029/2007JF000836 http://www.scopus.com/inward/record.url?scp=56649103660&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Peters , C , Walden , J & Austin , W 2008 , ' Magnetic signature of European margin sediments : Provenance of ice-rafted debris and the climatic response of the British ice sheet during Marine Isotope Stages 2 and 3 ' , Journal of Geophysical Research - Earth Surface , vol. 113 , no. F3 , F03007 . https://doi.org/10.1029/2007JF000836 GLACIAL NORTH-ATLANTIC HEINRICH EVENTS GREENLAND ICE LABRADOR SEA GRAIN-SIZE NE ATLANTIC CORE RECORD BARRA-FAN LAYERS BEHAVIOR article 2008 ftunstandrewcris https://doi.org/10.1029/2007JF000836 2021-12-26T14:17:32Z Mineral magnetic measurements are used to distinguish ice-rafted debris (IRD) sources and climate cycles spanning Marine Isotope Stage (MIS) 3 and MIS2 in core MD95-2006, from the Barra Fan, NE Atlantic. Distinct magnetic properties are displayed by IRD from the Laurentide ice sheet (LIS) (high susceptibility (chi), low isothermal remanent magnetization (IRM), low coercivity and the Verwey transition), the British ice sheet (BIS) (high chi, high IRM, medium coercivity and suppressed Verwey transition) and the ambient background sediment (low chi and low IRM). A magnetic unmixing model quantifies proportions of the IRD sources during Greenland Stadial (GS) 16 to GS3 (57.3 to 22.6 ka B. P.) spanning Heinrich Event (H) 5 to H2. The magnetic model suggests LIS IRD is only dominant within an interval during GS9, assigned to H4. Prior to H4 low proportions of BIS IRD suggest the BIS was not able to deliver significant amounts of IRD into the marine system. Following H4, proportions of BIS IRD during stadials increase, suggesting growth of the BIS during the latter stages of MIS3, with further expansion of the BIS during MIS2. LIS IRD within H2 is masked by BIS IRD input. Climatically driven anhysteretic remanent magnetizations reflect the short Dansgaard-Oeschger cycles between H5 and H4, while the proportions of hard magnetic minerals reflect the longer-term Bond cycles. Article in Journal/Newspaper Greenland Ice Sheet Labrador Sea North Atlantic University of St Andrews: Research Portal Barra ENVELOPE(-61.417,-61.417,-64.367,-64.367) Greenland Journal of Geophysical Research 113 F3 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
GLACIAL NORTH-ATLANTIC HEINRICH EVENTS GREENLAND ICE LABRADOR SEA GRAIN-SIZE NE ATLANTIC CORE RECORD BARRA-FAN LAYERS BEHAVIOR |
spellingShingle |
GLACIAL NORTH-ATLANTIC HEINRICH EVENTS GREENLAND ICE LABRADOR SEA GRAIN-SIZE NE ATLANTIC CORE RECORD BARRA-FAN LAYERS BEHAVIOR Peters, Clare Walden, John Austin, William Magnetic signature of European margin sediments:Provenance of ice-rafted debris and the climatic response of the British ice sheet during Marine Isotope Stages 2 and 3 |
topic_facet |
GLACIAL NORTH-ATLANTIC HEINRICH EVENTS GREENLAND ICE LABRADOR SEA GRAIN-SIZE NE ATLANTIC CORE RECORD BARRA-FAN LAYERS BEHAVIOR |
description |
Mineral magnetic measurements are used to distinguish ice-rafted debris (IRD) sources and climate cycles spanning Marine Isotope Stage (MIS) 3 and MIS2 in core MD95-2006, from the Barra Fan, NE Atlantic. Distinct magnetic properties are displayed by IRD from the Laurentide ice sheet (LIS) (high susceptibility (chi), low isothermal remanent magnetization (IRM), low coercivity and the Verwey transition), the British ice sheet (BIS) (high chi, high IRM, medium coercivity and suppressed Verwey transition) and the ambient background sediment (low chi and low IRM). A magnetic unmixing model quantifies proportions of the IRD sources during Greenland Stadial (GS) 16 to GS3 (57.3 to 22.6 ka B. P.) spanning Heinrich Event (H) 5 to H2. The magnetic model suggests LIS IRD is only dominant within an interval during GS9, assigned to H4. Prior to H4 low proportions of BIS IRD suggest the BIS was not able to deliver significant amounts of IRD into the marine system. Following H4, proportions of BIS IRD during stadials increase, suggesting growth of the BIS during the latter stages of MIS3, with further expansion of the BIS during MIS2. LIS IRD within H2 is masked by BIS IRD input. Climatically driven anhysteretic remanent magnetizations reflect the short Dansgaard-Oeschger cycles between H5 and H4, while the proportions of hard magnetic minerals reflect the longer-term Bond cycles. |
format |
Article in Journal/Newspaper |
author |
Peters, Clare Walden, John Austin, William |
author_facet |
Peters, Clare Walden, John Austin, William |
author_sort |
Peters, Clare |
title |
Magnetic signature of European margin sediments:Provenance of ice-rafted debris and the climatic response of the British ice sheet during Marine Isotope Stages 2 and 3 |
title_short |
Magnetic signature of European margin sediments:Provenance of ice-rafted debris and the climatic response of the British ice sheet during Marine Isotope Stages 2 and 3 |
title_full |
Magnetic signature of European margin sediments:Provenance of ice-rafted debris and the climatic response of the British ice sheet during Marine Isotope Stages 2 and 3 |
title_fullStr |
Magnetic signature of European margin sediments:Provenance of ice-rafted debris and the climatic response of the British ice sheet during Marine Isotope Stages 2 and 3 |
title_full_unstemmed |
Magnetic signature of European margin sediments:Provenance of ice-rafted debris and the climatic response of the British ice sheet during Marine Isotope Stages 2 and 3 |
title_sort |
magnetic signature of european margin sediments:provenance of ice-rafted debris and the climatic response of the british ice sheet during marine isotope stages 2 and 3 |
publishDate |
2008 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/magnetic-signature-of-european-margin-sediments(a3f012a6-e393-4716-8d57-90f4b189ec76).html https://doi.org/10.1029/2007JF000836 http://www.scopus.com/inward/record.url?scp=56649103660&partnerID=8YFLogxK |
long_lat |
ENVELOPE(-61.417,-61.417,-64.367,-64.367) |
geographic |
Barra Greenland |
geographic_facet |
Barra Greenland |
genre |
Greenland Ice Sheet Labrador Sea North Atlantic |
genre_facet |
Greenland Ice Sheet Labrador Sea North Atlantic |
op_source |
Peters , C , Walden , J & Austin , W 2008 , ' Magnetic signature of European margin sediments : Provenance of ice-rafted debris and the climatic response of the British ice sheet during Marine Isotope Stages 2 and 3 ' , Journal of Geophysical Research - Earth Surface , vol. 113 , no. F3 , F03007 . https://doi.org/10.1029/2007JF000836 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1029/2007JF000836 |
container_title |
Journal of Geophysical Research |
container_volume |
113 |
container_issue |
F3 |
_version_ |
1766017965965180928 |