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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ftnerc:oai:nora.nerc.ac.uk:512037 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, Nicholas J. McCave, I. Nick Henstock, Timothy J. Murton, Bramley Jones, Stephen M. 2015-10-15 text http://nora.nerc.ac.uk/id/eprint/512037/ https://nora.nerc.ac.uk/id/eprint/512037/1/Parnell-Turner_et_al-2015-Geochemistry,_Geophysics,_Geosystems.pdf https://doi.org/10.1002/2015GC005947 en eng https://nora.nerc.ac.uk/id/eprint/512037/1/Parnell-Turner_et_al-2015-Geochemistry,_Geophysics,_Geosystems.pdf Parnell-Turner, Ross; White, Nicholas J.; McCave, I. Nick; Henstock, Timothy J.; Murton, Bramley orcid:0000-0003-1522-1191 Jones, Stephen M. 2015 Architecture of North Atlantic contourite drifts modified by transient circulation of the Icelandic mantle plume. Geochemistry, Geophysics, Geosystems, 16 (10). 3414-3435. https://doi.org/10.1002/2015GC005947 <https://doi.org/10.1002/2015GC005947> Publication - Article PeerReviewed 2015 ftnerc https://doi.org/10.1002/2015GC005947 2023-02-04T19:42:16Z 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 Natural Environment Research Council: NERC Open Research Archive Greenland Geochemistry, Geophysics, Geosystems 16 10 3414 3435 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
English |
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, Nicholas J. McCave, I. Nick Henstock, Timothy J. Murton, Bramley Jones, Stephen M. |
spellingShingle |
Parnell-Turner, Ross White, Nicholas J. McCave, I. Nick Henstock, Timothy J. Murton, Bramley Jones, Stephen M. Architecture of North Atlantic contourite drifts modified by transient circulation of the Icelandic mantle plume |
author_facet |
Parnell-Turner, Ross White, Nicholas J. McCave, I. Nick Henstock, Timothy J. 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 |
publishDate |
2015 |
url |
http://nora.nerc.ac.uk/id/eprint/512037/ https://nora.nerc.ac.uk/id/eprint/512037/1/Parnell-Turner_et_al-2015-Geochemistry,_Geophysics,_Geosystems.pdf 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 |
https://nora.nerc.ac.uk/id/eprint/512037/1/Parnell-Turner_et_al-2015-Geochemistry,_Geophysics,_Geosystems.pdf Parnell-Turner, Ross; White, Nicholas J.; McCave, I. Nick; Henstock, Timothy J.; Murton, Bramley orcid:0000-0003-1522-1191 Jones, Stephen M. 2015 Architecture of North Atlantic contourite drifts modified by transient circulation of the Icelandic mantle plume. Geochemistry, Geophysics, Geosystems, 16 (10). 3414-3435. 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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1766017990964281344 |