Synchronous changes in sediment transport and provenance at the Iceland‐Faroe Ridge linked to millennial climate variability from 55 to 6 ka BP
Unique marine sediment cores retrieved from the southwestern slope of the Iceland‐Faroe Ridge (IFR), close to the main axis of the Iceland‐Scotland Overflow Water (ISOW) revealed prominent sedimentary cycles reflecting near‐bottom current dynamics, sediment transport and deposition, coincident with...
Published in: | Geochemistry, Geophysics, Geosystems |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://oceanrep.geomar.de/id/eprint/47366/ https://oceanrep.geomar.de/id/eprint/47366/7/Mirzaloo_et_al-2019-Geochemistry,_Geophysics,_Geosystems.pdf https://doi.org/10.1029/2019GC008298 |
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ftoceanrep:oai:oceanrep.geomar.de:47366 2023-05-15T16:13:06+02:00 Synchronous changes in sediment transport and provenance at the Iceland‐Faroe Ridge linked to millennial climate variability from 55 to 6 ka BP Mirzaloo, Maryam Nürnberg, Dirk Kienast, M. Lubbe, H. J. L. 2019-09 text https://oceanrep.geomar.de/id/eprint/47366/ https://oceanrep.geomar.de/id/eprint/47366/7/Mirzaloo_et_al-2019-Geochemistry,_Geophysics,_Geosystems.pdf https://doi.org/10.1029/2019GC008298 en eng Wiley Blackwell https://oceanrep.geomar.de/id/eprint/47366/7/Mirzaloo_et_al-2019-Geochemistry,_Geophysics,_Geosystems.pdf Mirzaloo, M. , Nürnberg, D. , Kienast, M. and Lubbe, H. J. L. (2019) Synchronous changes in sediment transport and provenance at the Iceland‐Faroe Ridge linked to millennial climate variability from 55 to 6 ka BP. Open Access Geochemistry, Geophysics, Geosystems, 20 (8). pp. 4184-4201. DOI 10.1029/2019GC008298 <https://doi.org/10.1029/2019GC008298>. doi:10.1029/2019GC008298 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2019 ftoceanrep https://doi.org/10.1029/2019GC008298 2023-04-07T15:46:50Z Unique marine sediment cores retrieved from the southwestern slope of the Iceland‐Faroe Ridge (IFR), close to the main axis of the Iceland‐Scotland Overflow Water (ISOW) revealed prominent sedimentary cycles reflecting near‐bottom current dynamics, sediment transport and deposition, coincident with Dansgaard‐Oeschger cycles and deglacial perturbations of the Atlantic Meridional Overturning Circulation (AMOC). The transition between Greenland Stadials (GSs) and Greenland Interstadials (GIs) follows a distinct, recurring sedimentation pattern. Basaltic (Ti‐rich) silts were transported from local volcanic sources by strong bottom currents and deposited during GIs comparable to modern ocean circulation. Finer‐grained felsic (K‐rich) sediments were deposited during GSs, when ISOW was weak. Possible felsic source areas include British‐Ireland and/or Fennoscandian shelf areas. A cyclic saw‐tooth pattern of bottom current strength is characterized by gradual intensification during GIs followed by a sharp decline towards GSs as is documented at core sites along the flank of Reykjanes Ridge. The cores north of Faroe Channel instead document the opposite pattern. This suggests that the near‐bottom currents along the Reykjanes Ridge are strongly controlled by the flow cascading over the IFR. Heinrich (like) Stadials (HSs) especially HS‐1 and HS‐2 are characterized by the deposition of very fine felsic sediments pointing to weakened bottom currents. Distinct coarse‐grained intervals of ice rafted debris (IRD) are absent from the sediment records, although pebble and gravel sized IRD is irregularly distributed throughout the fine sediment matrix. Near bottom currents are considered to have a major control on the lithogenic sediment deposition southwest of the Iceland‐Faroe Ridge and further down‐stream. Article in Journal/Newspaper Fennoscandian Greenland Iceland OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Greenland Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Geochemistry, Geophysics, Geosystems 20 8 4184 4201 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Unique marine sediment cores retrieved from the southwestern slope of the Iceland‐Faroe Ridge (IFR), close to the main axis of the Iceland‐Scotland Overflow Water (ISOW) revealed prominent sedimentary cycles reflecting near‐bottom current dynamics, sediment transport and deposition, coincident with Dansgaard‐Oeschger cycles and deglacial perturbations of the Atlantic Meridional Overturning Circulation (AMOC). The transition between Greenland Stadials (GSs) and Greenland Interstadials (GIs) follows a distinct, recurring sedimentation pattern. Basaltic (Ti‐rich) silts were transported from local volcanic sources by strong bottom currents and deposited during GIs comparable to modern ocean circulation. Finer‐grained felsic (K‐rich) sediments were deposited during GSs, when ISOW was weak. Possible felsic source areas include British‐Ireland and/or Fennoscandian shelf areas. A cyclic saw‐tooth pattern of bottom current strength is characterized by gradual intensification during GIs followed by a sharp decline towards GSs as is documented at core sites along the flank of Reykjanes Ridge. The cores north of Faroe Channel instead document the opposite pattern. This suggests that the near‐bottom currents along the Reykjanes Ridge are strongly controlled by the flow cascading over the IFR. Heinrich (like) Stadials (HSs) especially HS‐1 and HS‐2 are characterized by the deposition of very fine felsic sediments pointing to weakened bottom currents. Distinct coarse‐grained intervals of ice rafted debris (IRD) are absent from the sediment records, although pebble and gravel sized IRD is irregularly distributed throughout the fine sediment matrix. Near bottom currents are considered to have a major control on the lithogenic sediment deposition southwest of the Iceland‐Faroe Ridge and further down‐stream. |
format |
Article in Journal/Newspaper |
author |
Mirzaloo, Maryam Nürnberg, Dirk Kienast, M. Lubbe, H. J. L. |
spellingShingle |
Mirzaloo, Maryam Nürnberg, Dirk Kienast, M. Lubbe, H. J. L. Synchronous changes in sediment transport and provenance at the Iceland‐Faroe Ridge linked to millennial climate variability from 55 to 6 ka BP |
author_facet |
Mirzaloo, Maryam Nürnberg, Dirk Kienast, M. Lubbe, H. J. L. |
author_sort |
Mirzaloo, Maryam |
title |
Synchronous changes in sediment transport and provenance at the Iceland‐Faroe Ridge linked to millennial climate variability from 55 to 6 ka BP |
title_short |
Synchronous changes in sediment transport and provenance at the Iceland‐Faroe Ridge linked to millennial climate variability from 55 to 6 ka BP |
title_full |
Synchronous changes in sediment transport and provenance at the Iceland‐Faroe Ridge linked to millennial climate variability from 55 to 6 ka BP |
title_fullStr |
Synchronous changes in sediment transport and provenance at the Iceland‐Faroe Ridge linked to millennial climate variability from 55 to 6 ka BP |
title_full_unstemmed |
Synchronous changes in sediment transport and provenance at the Iceland‐Faroe Ridge linked to millennial climate variability from 55 to 6 ka BP |
title_sort |
synchronous changes in sediment transport and provenance at the iceland‐faroe ridge linked to millennial climate variability from 55 to 6 ka bp |
publisher |
Wiley |
publishDate |
2019 |
url |
https://oceanrep.geomar.de/id/eprint/47366/ https://oceanrep.geomar.de/id/eprint/47366/7/Mirzaloo_et_al-2019-Geochemistry,_Geophysics,_Geosystems.pdf https://doi.org/10.1029/2019GC008298 |
long_lat |
ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Greenland Reykjanes |
geographic_facet |
Greenland Reykjanes |
genre |
Fennoscandian Greenland Iceland |
genre_facet |
Fennoscandian Greenland Iceland |
op_relation |
https://oceanrep.geomar.de/id/eprint/47366/7/Mirzaloo_et_al-2019-Geochemistry,_Geophysics,_Geosystems.pdf Mirzaloo, M. , Nürnberg, D. , Kienast, M. and Lubbe, H. J. L. (2019) Synchronous changes in sediment transport and provenance at the Iceland‐Faroe Ridge linked to millennial climate variability from 55 to 6 ka BP. Open Access Geochemistry, Geophysics, Geosystems, 20 (8). pp. 4184-4201. DOI 10.1029/2019GC008298 <https://doi.org/10.1029/2019GC008298>. doi:10.1029/2019GC008298 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2019GC008298 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
20 |
container_issue |
8 |
container_start_page |
4184 |
op_container_end_page |
4201 |
_version_ |
1765998706465701888 |