Age and duration of Laschamp and Iceland Basin geomagnetic excursions in the South Atlantic Ocean
Age models for new records of the Laschamp and Iceland Basin excursions from the eastern flank of the South Atlantic mid-ocean ridge (44.15°S, 14.22°W) are derived from radiocarbon dates, and from matching sea-surface temperature records to Antarctic (EPICA) air-temperature records from ice cores. T...
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ftarchimer:oai:archimer.ifremer.fr:49562 2024-09-15T17:47:31+00:00 Age and duration of Laschamp and Iceland Basin geomagnetic excursions in the South Atlantic Ocean Channell, J. E. T. Riveiros, N. Vazquez Gottschalk, J. Waelbroeck, C. Skinner, L. C. 2017-07 application/pdf https://archimer.ifremer.fr/doc/00384/49562/111834.pdf https://doi.org/10.1016/j.quascirev.2017.04.020 https://archimer.ifremer.fr/doc/00384/49562/ eng eng Pergamon-elsevier Science Ltd info:eu-repo/grantAgreement/EC/FP7/339108/EU//ACCLIMATE https://archimer.ifremer.fr/doc/00384/49562/111834.pdf doi:10.1016/j.quascirev.2017.04.020 https://archimer.ifremer.fr/doc/00384/49562/ 2017 Elsevier Ltd. All rights reserved info:eu-repo/semantics/openAccess restricted use Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2017-07 , Vol. 167 , P. 1-13 text Article info:eu-repo/semantics/article 2017 ftarchimer https://doi.org/10.1016/j.quascirev.2017.04.020 2024-07-23T23:45:01Z Age models for new records of the Laschamp and Iceland Basin excursions from the eastern flank of the South Atlantic mid-ocean ridge (44.15°S, 14.22°W) are derived from radiocarbon dates, and from matching sea-surface temperature records to Antarctic (EPICA) air-temperature records from ice cores. The onset of the Laschamp excursion occurred during Antarctic Isotopic Maximum (AIM) 10, consistent with its occurrence during Greenland Interstadial 10. The end of the Laschamp excursion occurred prior to AIM 9 in Greenland Stadial 10. The age model is supported by synchroneity of directional and relative paleointensity manifestations of the Laschamp excursion in the marine core with peaks in EPICA10Be and nitrate flux. The Iceland Basin excursion is synchronous with the final phase of the transition from marine isotope stage (MIS) 7a to MIS 6e as recorded in the EPICA δD record. The onset of the Laschamp and Iceland Basin excursions, defined here by component inclinations >−40°, occurred at 41.4 ka and 190.0 ka, and durations are ∼1 kyr and ∼3.5 kyr, respectively, although these estimates depend on the criteria used to define the directional excursions. By comparison with Laschamp and Iceland Basin excursion records from the North Atlantic Ocean, the two excursions are synchronous at centennial timescales between the two hemispheres, based on synchronization of the GICC05 and AICC2012 age models for Greenland and Antarctic ice cores. Article in Journal/Newspaper Antarc* Antarctic EPICA Greenland Iceland North Atlantic South Atlantic Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Quaternary Science Reviews 167 1 13 |
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Open Polar |
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Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
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ftarchimer |
language |
English |
description |
Age models for new records of the Laschamp and Iceland Basin excursions from the eastern flank of the South Atlantic mid-ocean ridge (44.15°S, 14.22°W) are derived from radiocarbon dates, and from matching sea-surface temperature records to Antarctic (EPICA) air-temperature records from ice cores. The onset of the Laschamp excursion occurred during Antarctic Isotopic Maximum (AIM) 10, consistent with its occurrence during Greenland Interstadial 10. The end of the Laschamp excursion occurred prior to AIM 9 in Greenland Stadial 10. The age model is supported by synchroneity of directional and relative paleointensity manifestations of the Laschamp excursion in the marine core with peaks in EPICA10Be and nitrate flux. The Iceland Basin excursion is synchronous with the final phase of the transition from marine isotope stage (MIS) 7a to MIS 6e as recorded in the EPICA δD record. The onset of the Laschamp and Iceland Basin excursions, defined here by component inclinations >−40°, occurred at 41.4 ka and 190.0 ka, and durations are ∼1 kyr and ∼3.5 kyr, respectively, although these estimates depend on the criteria used to define the directional excursions. By comparison with Laschamp and Iceland Basin excursion records from the North Atlantic Ocean, the two excursions are synchronous at centennial timescales between the two hemispheres, based on synchronization of the GICC05 and AICC2012 age models for Greenland and Antarctic ice cores. |
format |
Article in Journal/Newspaper |
author |
Channell, J. E. T. Riveiros, N. Vazquez Gottschalk, J. Waelbroeck, C. Skinner, L. C. |
spellingShingle |
Channell, J. E. T. Riveiros, N. Vazquez Gottschalk, J. Waelbroeck, C. Skinner, L. C. Age and duration of Laschamp and Iceland Basin geomagnetic excursions in the South Atlantic Ocean |
author_facet |
Channell, J. E. T. Riveiros, N. Vazquez Gottschalk, J. Waelbroeck, C. Skinner, L. C. |
author_sort |
Channell, J. E. T. |
title |
Age and duration of Laschamp and Iceland Basin geomagnetic excursions in the South Atlantic Ocean |
title_short |
Age and duration of Laschamp and Iceland Basin geomagnetic excursions in the South Atlantic Ocean |
title_full |
Age and duration of Laschamp and Iceland Basin geomagnetic excursions in the South Atlantic Ocean |
title_fullStr |
Age and duration of Laschamp and Iceland Basin geomagnetic excursions in the South Atlantic Ocean |
title_full_unstemmed |
Age and duration of Laschamp and Iceland Basin geomagnetic excursions in the South Atlantic Ocean |
title_sort |
age and duration of laschamp and iceland basin geomagnetic excursions in the south atlantic ocean |
publisher |
Pergamon-elsevier Science Ltd |
publishDate |
2017 |
url |
https://archimer.ifremer.fr/doc/00384/49562/111834.pdf https://doi.org/10.1016/j.quascirev.2017.04.020 https://archimer.ifremer.fr/doc/00384/49562/ |
genre |
Antarc* Antarctic EPICA Greenland Iceland North Atlantic South Atlantic Ocean |
genre_facet |
Antarc* Antarctic EPICA Greenland Iceland North Atlantic South Atlantic Ocean |
op_source |
Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2017-07 , Vol. 167 , P. 1-13 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/339108/EU//ACCLIMATE https://archimer.ifremer.fr/doc/00384/49562/111834.pdf doi:10.1016/j.quascirev.2017.04.020 https://archimer.ifremer.fr/doc/00384/49562/ |
op_rights |
2017 Elsevier Ltd. All rights reserved info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.quascirev.2017.04.020 |
container_title |
Quaternary Science Reviews |
container_volume |
167 |
container_start_page |
1 |
op_container_end_page |
13 |
_version_ |
1810496911979839488 |