Architecture of North Atlantic Contourite Drifts Modified by Transient Circulation of the Icelandic Mantle Plume
Overflow of Northern Component Water, the precursor of North Atlantic Deep Water, appears to have varied during Neogene times. It has been suggested that this variation is moderated by transient behavior of the Icelandic mantle plume, which has influenced North Atlantic bathymetry through time. Thus...
Published in: | Geochemistry, Geophysics, Geosystems |
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:3495 2023-05-15T16:28:21+02:00 Architecture of North Atlantic Contourite Drifts Modified by Transient Circulation of the Icelandic Mantle Plume Parnell-Turner, Ross White, N. J. McCave, I. Nick Henstock, Tim Murton, Bramley Jones, Stephen M. 2015-09 text http://eprints.esc.cam.ac.uk/3495/ http://eprints.esc.cam.ac.uk/3495/1/Parnell-Turner_et_al-2015-Geochemistry,_Geophysics,_Geosystems.pdf http://onlinelibrary.wiley.com/doi/10.1002/2015GC005947/abstract https://doi.org/10.1002/2015GC005947 en eng AGU http://eprints.esc.cam.ac.uk/3495/1/Parnell-Turner_et_al-2015-Geochemistry,_Geophysics,_Geosystems.pdf Parnell-Turner, Ross and White, N. J. and McCave, I. Nick and Henstock, Tim and Murton, Bramley and Jones, Stephen M. (2015) Architecture of North Atlantic Contourite Drifts Modified by Transient Circulation of the Icelandic Mantle Plume. Geochemistry Geophysics Geosystems, 16 (10). pp. 3414-3435. ISSN 1525-2027 DOI https://doi.org/10.1002/2015GC005947 <https://doi.org/10.1002/2015GC005947> 02 - Geodynamics Geophysics and Tectonics Article PeerReviewed 2015 ftucambridgeesc https://doi.org/10.1002/2015GC005947 2020-08-27T18:09:41Z Overflow of Northern Component Water, the precursor of North Atlantic Deep Water, appears to have varied during Neogene times. It has been suggested that this variation is moderated by transient behavior of the Icelandic mantle plume, which has influenced North Atlantic bathymetry through time. Thus pathways and intensities of bottom currents that control deposition of contourite drifts could be affected by mantle processes. Here, we present regional seismic reflection profiles that cross sedimentary accumulations (Björn, Gardar, Eirik and Hatton Drifts). Prominent reflections were mapped and calibrated using a combination of boreholes and legacy seismic profiles. Interpreted seismic profiles were used to reconstruct solid sedimentation rates. Björn Drift began to accumulate in late Miocene times. Its average sedimentation rate decreased at ∼2.5 Ma and increased again at ∼0.75 Ma. In contrast, Eirik Drift started to accumulate in early Miocene times. Its average sedimentation rate increased at ∼5.5 Ma and decreased at ∼2.2 Ma. In both cases, there is a good correlation between sedimentation rates, inferred Northern Component Water overflow, and the variation of Icelandic plume temperature independently obtained from the geometry of diachronous V-shaped ridges. Between 5.5 and 2.5 Ma, the plume cooled, which probably caused subsidence of the Greenland-Iceland-Scotland Ridge, allowing drift accumulation to increase. When the plume became hotter at 2.5 Ma, drift accumulation rate fell. We infer that deep-water current strength is modulated by fluctuating dynamic support of the Greenland-Scotland Ridge. Our results highlight the potential link between mantle convective processes and ocean circulation. Article in Journal/Newspaper Greenland Greenland-Scotland Ridge Iceland North Atlantic Deep Water North Atlantic University of Cambridge, Department of Earth Sciences: ESC Publications Greenland Geochemistry, Geophysics, Geosystems 16 10 3414 3435 |
institution |
Open Polar |
collection |
University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
02 - Geodynamics Geophysics and Tectonics |
spellingShingle |
02 - Geodynamics Geophysics and Tectonics Parnell-Turner, Ross White, N. J. McCave, I. Nick Henstock, Tim Murton, Bramley Jones, Stephen M. Architecture of North Atlantic Contourite Drifts Modified by Transient Circulation of the Icelandic Mantle Plume |
topic_facet |
02 - Geodynamics Geophysics and Tectonics |
description |
Overflow of Northern Component Water, the precursor of North Atlantic Deep Water, appears to have varied during Neogene times. It has been suggested that this variation is moderated by transient behavior of the Icelandic mantle plume, which has influenced North Atlantic bathymetry through time. Thus pathways and intensities of bottom currents that control deposition of contourite drifts could be affected by mantle processes. Here, we present regional seismic reflection profiles that cross sedimentary accumulations (Björn, Gardar, Eirik and Hatton Drifts). Prominent reflections were mapped and calibrated using a combination of boreholes and legacy seismic profiles. Interpreted seismic profiles were used to reconstruct solid sedimentation rates. Björn Drift began to accumulate in late Miocene times. Its average sedimentation rate decreased at ∼2.5 Ma and increased again at ∼0.75 Ma. In contrast, Eirik Drift started to accumulate in early Miocene times. Its average sedimentation rate increased at ∼5.5 Ma and decreased at ∼2.2 Ma. In both cases, there is a good correlation between sedimentation rates, inferred Northern Component Water overflow, and the variation of Icelandic plume temperature independently obtained from the geometry of diachronous V-shaped ridges. Between 5.5 and 2.5 Ma, the plume cooled, which probably caused subsidence of the Greenland-Iceland-Scotland Ridge, allowing drift accumulation to increase. When the plume became hotter at 2.5 Ma, drift accumulation rate fell. We infer that deep-water current strength is modulated by fluctuating dynamic support of the Greenland-Scotland Ridge. Our results highlight the potential link between mantle convective processes and ocean circulation. |
format |
Article in Journal/Newspaper |
author |
Parnell-Turner, Ross White, N. J. McCave, I. Nick Henstock, Tim Murton, Bramley Jones, Stephen M. |
author_facet |
Parnell-Turner, Ross White, N. J. McCave, I. Nick Henstock, Tim Murton, Bramley Jones, Stephen M. |
author_sort |
Parnell-Turner, Ross |
title |
Architecture of North Atlantic Contourite Drifts Modified by Transient Circulation of the Icelandic Mantle Plume |
title_short |
Architecture of North Atlantic Contourite Drifts Modified by Transient Circulation of the Icelandic Mantle Plume |
title_full |
Architecture of North Atlantic Contourite Drifts Modified by Transient Circulation of the Icelandic Mantle Plume |
title_fullStr |
Architecture of North Atlantic Contourite Drifts Modified by Transient Circulation of the Icelandic Mantle Plume |
title_full_unstemmed |
Architecture of North Atlantic Contourite Drifts Modified by Transient Circulation of the Icelandic Mantle Plume |
title_sort |
architecture of north atlantic contourite drifts modified by transient circulation of the icelandic mantle plume |
publisher |
AGU |
publishDate |
2015 |
url |
http://eprints.esc.cam.ac.uk/3495/ http://eprints.esc.cam.ac.uk/3495/1/Parnell-Turner_et_al-2015-Geochemistry,_Geophysics,_Geosystems.pdf http://onlinelibrary.wiley.com/doi/10.1002/2015GC005947/abstract https://doi.org/10.1002/2015GC005947 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland-Scotland Ridge Iceland North Atlantic Deep Water North Atlantic |
genre_facet |
Greenland Greenland-Scotland Ridge Iceland North Atlantic Deep Water North Atlantic |
op_relation |
http://eprints.esc.cam.ac.uk/3495/1/Parnell-Turner_et_al-2015-Geochemistry,_Geophysics,_Geosystems.pdf Parnell-Turner, Ross and White, N. J. and McCave, I. Nick and Henstock, Tim and Murton, Bramley and Jones, Stephen M. (2015) Architecture of North Atlantic Contourite Drifts Modified by Transient Circulation of the Icelandic Mantle Plume. Geochemistry Geophysics Geosystems, 16 (10). pp. 3414-3435. ISSN 1525-2027 DOI https://doi.org/10.1002/2015GC005947 <https://doi.org/10.1002/2015GC005947> |
op_doi |
https://doi.org/10.1002/2015GC005947 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
16 |
container_issue |
10 |
container_start_page |
3414 |
op_container_end_page |
3435 |
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1766018002597183488 |