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 wit...
Published in: | Geochemistry, Geophysics, Geosystems |
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ftsubggeo:oai:e-docs.geo-leo.de:11858/9053 2023-05-15T16:13:05+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, M. Nürnberg, D. Kienast, M. van der Lubbe, H. J. L. 2019 https://doi.org/10.1029/2019GC008298 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9053 eng eng doi:10.1029/2019GC008298 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9053 This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY Iceland-Scotland Overflow Oscillation sediment transport sediment provenances grain size end-members doc-type:article 2019 ftsubggeo https://doi.org/10.1029/2019GC008298 2022-11-09T06:51:40Z 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. 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 Iceland-Scotland Overflow was weak. Possible felsic source areas include British-Ireland and/or Fennoscandian shelf areas. A cyclic sawtooth pattern of bottom current strength is characterized by gradual intensification during GIs followed by a sharp decline toward GSs as is documented at core sites along the flank of Reykjanes Ridge. The cores north of the 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) 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 are absent from the sediment records, although pebble- and gravel-sized ice-rafted debris 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 IFR and further downstream. Article in Journal/Newspaper Fennoscandian Greenland Iceland GEO-LEOe-docs (FID GEO) Greenland Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Geochemistry, Geophysics, Geosystems 20 8 4184 4201 |
institution |
Open Polar |
collection |
GEO-LEOe-docs (FID GEO) |
op_collection_id |
ftsubggeo |
language |
English |
topic |
Iceland-Scotland Overflow Oscillation sediment transport sediment provenances grain size end-members |
spellingShingle |
Iceland-Scotland Overflow Oscillation sediment transport sediment provenances grain size end-members Mirzaloo, M. Nürnberg, D. Kienast, M. van der 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 |
topic_facet |
Iceland-Scotland Overflow Oscillation sediment transport sediment provenances grain size end-members |
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. 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 Iceland-Scotland Overflow was weak. Possible felsic source areas include British-Ireland and/or Fennoscandian shelf areas. A cyclic sawtooth pattern of bottom current strength is characterized by gradual intensification during GIs followed by a sharp decline toward GSs as is documented at core sites along the flank of Reykjanes Ridge. The cores north of the 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) 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 are absent from the sediment records, although pebble- and gravel-sized ice-rafted debris 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 IFR and further downstream. |
format |
Article in Journal/Newspaper |
author |
Mirzaloo, M. Nürnberg, D. Kienast, M. van der Lubbe, H. J. L. |
author_facet |
Mirzaloo, M. Nürnberg, D. Kienast, M. van der Lubbe, H. J. L. |
author_sort |
Mirzaloo, M. |
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 |
publishDate |
2019 |
url |
https://doi.org/10.1029/2019GC008298 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9053 |
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 |
doi:10.1029/2019GC008298 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9053 |
op_rights |
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
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 |
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1765998697056829440 |