V-shaped ridges around Iceland: Implications for spatial and temporal patterns of mantle convection
International audience V-shaped lineations in the bathymetry and in the free-air gravity field surrounding Iceland result from crustal thickness variations caused by temporal variations in melt production rate at the Mid-Atlantic Ridge. We have studied the record of V-shaped ridges in the basins sur...
Published in: | Geochemistry, Geophysics, Geosystems |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-03597793 https://hal-insu.archives-ouvertes.fr/insu-03597793/document https://hal-insu.archives-ouvertes.fr/insu-03597793/file/Geochem%20Geophys%20Geosyst%20-%202002%20-%20Jones%20-%20V%25u2010shaped%20ridges%20around%20Iceland%20Implications%20for%20spatial%20and%20temporal%20patterns%20of.pdf https://doi.org/10.1029/2002GC000361 |
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ftinsu:oai:HAL:insu-03597793v1 2023-06-18T03:40:34+02:00 V-shaped ridges around Iceland: Implications for spatial and temporal patterns of mantle convection Jones, Stephen M. White, Nicky Maclennan, John Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) 2002 https://hal-insu.archives-ouvertes.fr/insu-03597793 https://hal-insu.archives-ouvertes.fr/insu-03597793/document https://hal-insu.archives-ouvertes.fr/insu-03597793/file/Geochem%20Geophys%20Geosyst%20-%202002%20-%20Jones%20-%20V%25u2010shaped%20ridges%20around%20Iceland%20Implications%20for%20spatial%20and%20temporal%20patterns%20of.pdf https://doi.org/10.1029/2002GC000361 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1029/2002GC000361 insu-03597793 https://hal-insu.archives-ouvertes.fr/insu-03597793 https://hal-insu.archives-ouvertes.fr/insu-03597793/document https://hal-insu.archives-ouvertes.fr/insu-03597793/file/Geochem%20Geophys%20Geosyst%20-%202002%20-%20Jones%20-%20V%25u2010shaped%20ridges%20around%20Iceland%20Implications%20for%20spatial%20and%20temporal%20patterns%20of.pdf BIBCODE: 2002GGG.3.1059J doi:10.1029/2002GC000361 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal-insu.archives-ouvertes.fr/insu-03597793 Geochemistry, Geophysics, Geosystems, 2002, 3, pp. 583-596. ⟨10.1029/2002GC000361⟩ V-shaped ridges Iceland Mantle Plume time-dependent convection Northern Component Water [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2002 ftinsu https://doi.org/10.1029/2002GC000361 2023-06-05T20:48:18Z International audience V-shaped lineations in the bathymetry and in the free-air gravity field surrounding Iceland result from crustal thickness variations caused by temporal variations in melt production rate at the Mid-Atlantic Ridge. We have studied the record of V-shaped ridges in the basins surrounding Iceland by plotting the short-wavelength component of the gravity field in terms of age versus distance from Iceland. The V-shaped ridge gravity signal is obscured by crustal segmentation and by sediment more than 1-2 km thick. The best V-shaped ridge record is found in the unsegmented part of the Irminger Basin, where Oligocene-Recent V-shaped ridges occur with a primary periodicity of 5-6 Myr and a secondary periodicity of 2-3 Myr. V-shaped ridge records from the Iceland Basin and from east of the Kolbeinsey Ridge to the north of Iceland correlate with the record from the Irminger Basin but are less complete. A record of uplift of the Greenland-Iceland-Faroes Ridge based on paleoceanographic data is correlated with the gravity record of V-shaped ridges. There is less decisive evidence for V-shaped ridges in crust of Eocene age. The observation that V-shaped ridges propagate up to 1000 km from Iceland is compatible with a model in which the Iceland Plume head spreads out from the plume stalk below a depth of ∼100 km, as suggested by geochemical arguments and studies of mantle rheology. Time-dependent flow in the plume head probably results from time-dependent flow up the plume stalk from deep below Iceland. These pulses may have triggered jumps in location of the spreading axis observed in the Icelandic geological record. Article in Journal/Newspaper Faroes Greenland Iceland Kolbeinsey Institut national des sciences de l'Univers: HAL-INSU Greenland Irminger Basin ENVELOPE(-36.000,-36.000,61.000,61.000) Kolbeinsey ENVELOPE(-18.687,-18.687,67.149,67.149) Kolbeinsey Ridge ENVELOPE(-16.917,-16.917,68.833,68.833) Mid-Atlantic Ridge Geochemistry, Geophysics, Geosystems 3 10 1 23 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
V-shaped ridges Iceland Mantle Plume time-dependent convection Northern Component Water [SDU]Sciences of the Universe [physics] |
spellingShingle |
V-shaped ridges Iceland Mantle Plume time-dependent convection Northern Component Water [SDU]Sciences of the Universe [physics] Jones, Stephen M. White, Nicky Maclennan, John V-shaped ridges around Iceland: Implications for spatial and temporal patterns of mantle convection |
topic_facet |
V-shaped ridges Iceland Mantle Plume time-dependent convection Northern Component Water [SDU]Sciences of the Universe [physics] |
description |
International audience V-shaped lineations in the bathymetry and in the free-air gravity field surrounding Iceland result from crustal thickness variations caused by temporal variations in melt production rate at the Mid-Atlantic Ridge. We have studied the record of V-shaped ridges in the basins surrounding Iceland by plotting the short-wavelength component of the gravity field in terms of age versus distance from Iceland. The V-shaped ridge gravity signal is obscured by crustal segmentation and by sediment more than 1-2 km thick. The best V-shaped ridge record is found in the unsegmented part of the Irminger Basin, where Oligocene-Recent V-shaped ridges occur with a primary periodicity of 5-6 Myr and a secondary periodicity of 2-3 Myr. V-shaped ridge records from the Iceland Basin and from east of the Kolbeinsey Ridge to the north of Iceland correlate with the record from the Irminger Basin but are less complete. A record of uplift of the Greenland-Iceland-Faroes Ridge based on paleoceanographic data is correlated with the gravity record of V-shaped ridges. There is less decisive evidence for V-shaped ridges in crust of Eocene age. The observation that V-shaped ridges propagate up to 1000 km from Iceland is compatible with a model in which the Iceland Plume head spreads out from the plume stalk below a depth of ∼100 km, as suggested by geochemical arguments and studies of mantle rheology. Time-dependent flow in the plume head probably results from time-dependent flow up the plume stalk from deep below Iceland. These pulses may have triggered jumps in location of the spreading axis observed in the Icelandic geological record. |
author2 |
Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Jones, Stephen M. White, Nicky Maclennan, John |
author_facet |
Jones, Stephen M. White, Nicky Maclennan, John |
author_sort |
Jones, Stephen M. |
title |
V-shaped ridges around Iceland: Implications for spatial and temporal patterns of mantle convection |
title_short |
V-shaped ridges around Iceland: Implications for spatial and temporal patterns of mantle convection |
title_full |
V-shaped ridges around Iceland: Implications for spatial and temporal patterns of mantle convection |
title_fullStr |
V-shaped ridges around Iceland: Implications for spatial and temporal patterns of mantle convection |
title_full_unstemmed |
V-shaped ridges around Iceland: Implications for spatial and temporal patterns of mantle convection |
title_sort |
v-shaped ridges around iceland: implications for spatial and temporal patterns of mantle convection |
publisher |
HAL CCSD |
publishDate |
2002 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03597793 https://hal-insu.archives-ouvertes.fr/insu-03597793/document https://hal-insu.archives-ouvertes.fr/insu-03597793/file/Geochem%20Geophys%20Geosyst%20-%202002%20-%20Jones%20-%20V%25u2010shaped%20ridges%20around%20Iceland%20Implications%20for%20spatial%20and%20temporal%20patterns%20of.pdf https://doi.org/10.1029/2002GC000361 |
long_lat |
ENVELOPE(-36.000,-36.000,61.000,61.000) ENVELOPE(-18.687,-18.687,67.149,67.149) ENVELOPE(-16.917,-16.917,68.833,68.833) |
geographic |
Greenland Irminger Basin Kolbeinsey Kolbeinsey Ridge Mid-Atlantic Ridge |
geographic_facet |
Greenland Irminger Basin Kolbeinsey Kolbeinsey Ridge Mid-Atlantic Ridge |
genre |
Faroes Greenland Iceland Kolbeinsey |
genre_facet |
Faroes Greenland Iceland Kolbeinsey |
op_source |
ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal-insu.archives-ouvertes.fr/insu-03597793 Geochemistry, Geophysics, Geosystems, 2002, 3, pp. 583-596. ⟨10.1029/2002GC000361⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2002GC000361 insu-03597793 https://hal-insu.archives-ouvertes.fr/insu-03597793 https://hal-insu.archives-ouvertes.fr/insu-03597793/document https://hal-insu.archives-ouvertes.fr/insu-03597793/file/Geochem%20Geophys%20Geosyst%20-%202002%20-%20Jones%20-%20V%25u2010shaped%20ridges%20around%20Iceland%20Implications%20for%20spatial%20and%20temporal%20patterns%20of.pdf BIBCODE: 2002GGG.3.1059J doi:10.1029/2002GC000361 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2002GC000361 |
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Geochemistry, Geophysics, Geosystems |
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3 |
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10 |
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