Ocean circulation and mantle melting controlled by radial flow of hot pulses in the Iceland plume
Convection of the mantle influences elevation at the Earth’s surface. For example, in the North Atlantic Ocean, V-shaped ridges of thickened oceanic crust that straddle the mid-ocean ridge are thought to arise from variations in the underlying mantle properties1. However, the detailed relationship b...
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:2063 2023-05-15T16:29:33+02:00 Ocean circulation and mantle melting controlled by radial flow of hot pulses in the Iceland plume Poore, H. R. White, N. J. Maclennan, J. 2011-08 application/pdf http://eprints.esc.cam.ac.uk/2063/ http://eprints.esc.cam.ac.uk/2063/1/ngeo1161.pdf https://doi.org/10.1038/ngeo1161 en eng NPG http://eprints.esc.cam.ac.uk/2063/1/ngeo1161.pdf Poore, H. R. and White, N. J. and Maclennan, J. (2011) Ocean circulation and mantle melting controlled by radial flow of hot pulses in the Iceland plume. Nature Geoscience, 4 (8). pp. 558-561. ISSN 1752-0894 EISSN:1752-0908 DOI https://doi.org/10.1038/ngeo1161 <https://doi.org/10.1038/ngeo1161> 02 - Geodynamics Geophysics and Tectonics Article PeerReviewed 2011 ftucambridgeesc https://doi.org/10.1038/ngeo1161 2020-08-27T18:09:08Z Convection of the mantle influences elevation at the Earth’s surface. For example, in the North Atlantic Ocean, V-shaped ridges of thickened oceanic crust that straddle the mid-ocean ridge are thought to arise from variations in the underlying mantle properties1. However, the detailed relationship between these V-shaped ridges and convective circulation is uncertain. Here we use measurements of residual water depth—a proxy for crustal thickness—and basaltic geochemistry to assess factors responsible for ridge formation. We find a correlation between basalt composition and crustal thickness that is best explained if V-shaped ridges are formed by the passage of unusually hot pulses of mantle away from Iceland. We also show that ocean circulation patterns over the past 7 million years, recorded by flow of the Northern Component Water2, 3, 4 from the Norwegian Sea into the Atlantic Ocean and the accumulation of thick drifts of sediment5, are controlled by variations in the elevation of sea floor between Greenland and Iceland. We suggest that pulses of hot mantle also drove periodic uplift of the sea floor, and moderated the export of water and sediment into the North Atlantic Ocean. Diverse observations can therefore be explained if blobs of mantle, 25 °C hotter than the background plume temperature, travelled up the conduit beneath Iceland and spread out radially at velocities of 40 cm yr−1. Article in Journal/Newspaper Greenland Iceland North Atlantic Norwegian Sea University of Cambridge, Department of Earth Sciences: ESC Publications Greenland Norwegian Sea Nature Geoscience 4 8 558 561 |
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Open Polar |
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University of Cambridge, Department of Earth Sciences: ESC Publications |
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language |
English |
topic |
02 - Geodynamics Geophysics and Tectonics |
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02 - Geodynamics Geophysics and Tectonics Poore, H. R. White, N. J. Maclennan, J. Ocean circulation and mantle melting controlled by radial flow of hot pulses in the Iceland plume |
topic_facet |
02 - Geodynamics Geophysics and Tectonics |
description |
Convection of the mantle influences elevation at the Earth’s surface. For example, in the North Atlantic Ocean, V-shaped ridges of thickened oceanic crust that straddle the mid-ocean ridge are thought to arise from variations in the underlying mantle properties1. However, the detailed relationship between these V-shaped ridges and convective circulation is uncertain. Here we use measurements of residual water depth—a proxy for crustal thickness—and basaltic geochemistry to assess factors responsible for ridge formation. We find a correlation between basalt composition and crustal thickness that is best explained if V-shaped ridges are formed by the passage of unusually hot pulses of mantle away from Iceland. We also show that ocean circulation patterns over the past 7 million years, recorded by flow of the Northern Component Water2, 3, 4 from the Norwegian Sea into the Atlantic Ocean and the accumulation of thick drifts of sediment5, are controlled by variations in the elevation of sea floor between Greenland and Iceland. We suggest that pulses of hot mantle also drove periodic uplift of the sea floor, and moderated the export of water and sediment into the North Atlantic Ocean. Diverse observations can therefore be explained if blobs of mantle, 25 °C hotter than the background plume temperature, travelled up the conduit beneath Iceland and spread out radially at velocities of 40 cm yr−1. |
format |
Article in Journal/Newspaper |
author |
Poore, H. R. White, N. J. Maclennan, J. |
author_facet |
Poore, H. R. White, N. J. Maclennan, J. |
author_sort |
Poore, H. R. |
title |
Ocean circulation and mantle melting controlled by radial flow of hot pulses in the Iceland plume |
title_short |
Ocean circulation and mantle melting controlled by radial flow of hot pulses in the Iceland plume |
title_full |
Ocean circulation and mantle melting controlled by radial flow of hot pulses in the Iceland plume |
title_fullStr |
Ocean circulation and mantle melting controlled by radial flow of hot pulses in the Iceland plume |
title_full_unstemmed |
Ocean circulation and mantle melting controlled by radial flow of hot pulses in the Iceland plume |
title_sort |
ocean circulation and mantle melting controlled by radial flow of hot pulses in the iceland plume |
publisher |
NPG |
publishDate |
2011 |
url |
http://eprints.esc.cam.ac.uk/2063/ http://eprints.esc.cam.ac.uk/2063/1/ngeo1161.pdf https://doi.org/10.1038/ngeo1161 |
geographic |
Greenland Norwegian Sea |
geographic_facet |
Greenland Norwegian Sea |
genre |
Greenland Iceland North Atlantic Norwegian Sea |
genre_facet |
Greenland Iceland North Atlantic Norwegian Sea |
op_relation |
http://eprints.esc.cam.ac.uk/2063/1/ngeo1161.pdf Poore, H. R. and White, N. J. and Maclennan, J. (2011) Ocean circulation and mantle melting controlled by radial flow of hot pulses in the Iceland plume. Nature Geoscience, 4 (8). pp. 558-561. ISSN 1752-0894 EISSN:1752-0908 DOI https://doi.org/10.1038/ngeo1161 <https://doi.org/10.1038/ngeo1161> |
op_doi |
https://doi.org/10.1038/ngeo1161 |
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Nature Geoscience |
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4 |
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8 |
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558 |
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561 |
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1766019260796108800 |