Fast and partitioned postglacial rebound of southwestern Iceland
International audience Located both on the Mid-Atlantic Ridge and above a mantle plume, Iceland is subject to horizontal and vertical motions. Many studies described these deformations in terms of rifting episodes that have combined both extensional tectonics and magmatism. However, few studies have...
Published in: | Tectonics |
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Format: | Article in Journal/Newspaper |
Language: | English |
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ftinsu:oai:HAL:insu-00286999v1 2023-07-30T04:04:07+02:00 Fast and partitioned postglacial rebound of southwestern Iceland Biessy, Guillaume Dauteuil, Olivier van Vliet-Lanoë, Brigitte Wayolle, A. Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS) Processus et bilan des domaines sédimentaires (PBDS) Université de Lille, Sciences et Technologies-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2008 https://insu.hal.science/insu-00286999 https://insu.hal.science/insu-00286999/document https://insu.hal.science/insu-00286999/file/Biessy_et_al-2008-Tectonics.pdf https://doi.org/10.1029/2007TC002177 en eng HAL CCSD American Geophysical Union (AGU) info:eu-repo/semantics/altIdentifier/doi/10.1029/2007TC002177 insu-00286999 https://insu.hal.science/insu-00286999 https://insu.hal.science/insu-00286999/document https://insu.hal.science/insu-00286999/file/Biessy_et_al-2008-Tectonics.pdf doi:10.1029/2007TC002177 info:eu-repo/semantics/OpenAccess ISSN: 0278-7407 EISSN: 1944-9194 Tectonics https://insu.hal.science/insu-00286999 Tectonics, 2008, 27 (3), pp.TC3002. ⟨10.1029/2007TC002177⟩ glacio-isostasy rebound rheology [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics info:eu-repo/semantics/article Journal articles 2008 ftinsu https://doi.org/10.1029/2007TC002177 2023-07-12T16:32:55Z International audience Located both on the Mid-Atlantic Ridge and above a mantle plume, Iceland is subject to horizontal and vertical motions. Many studies described these deformations in terms of rifting episodes that have combined both extensional tectonics and magmatism. However, few studies have described the glacio-isostatic response induced by the retreat of the Weichselian ice cap. The melting of this ice cap induced a postglacial rebound for the whole of Iceland that may be controlled by the geodynamic setting and the rheological layering of the lithosphere. This study is devoted to (1) understanding the Holocene rebound on the southwestern coast and (2) estimating the asthenosphere viscosity and depth beneath Iceland. Two stages of holocene evolution were determined by means of GPS profiles, morphological observations, and data compilation. The first stage corresponds to a vertical uplift of 67.5 to 157.5 m. It started at 10,000 years BP and ended at 8500 years BP implying uplift rates between 4.5 and 10.5 cm/a. It was a quick isostatic response to the fast ice retreat. The second stage had vertical motion of tens of meters with a probable tectonic origin and started at 8500 years BP. The uplift rate is 1 to 2 orders of magnitude slower than the one during the first stage. Uplift partitioning during the first stage was controlled by the thermal state of the lithosphere, the highest geothermal flux inducing the maximum uplift rates. The relaxation time for uplift provides a viscosity estimate of 5.45.8 — 1019 Pa s for the asthenosphere. This value is similar to those determined for glacial areas in different continental contexts. However, the flexural wavelength indicates a shallower asthenosphere than that occurring in continental domains. Therefore this study highlights a coupling between the thermal structure of the Icelandic asthenosphere and the glacial rebound. Article in Journal/Newspaper Ice cap Iceland Institut national des sciences de l'Univers: HAL-INSU Mid-Atlantic Ridge Tectonics 27 3 n/a n/a |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
glacio-isostasy rebound rheology [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
spellingShingle |
glacio-isostasy rebound rheology [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics Biessy, Guillaume Dauteuil, Olivier van Vliet-Lanoë, Brigitte Wayolle, A. Fast and partitioned postglacial rebound of southwestern Iceland |
topic_facet |
glacio-isostasy rebound rheology [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics |
description |
International audience Located both on the Mid-Atlantic Ridge and above a mantle plume, Iceland is subject to horizontal and vertical motions. Many studies described these deformations in terms of rifting episodes that have combined both extensional tectonics and magmatism. However, few studies have described the glacio-isostatic response induced by the retreat of the Weichselian ice cap. The melting of this ice cap induced a postglacial rebound for the whole of Iceland that may be controlled by the geodynamic setting and the rheological layering of the lithosphere. This study is devoted to (1) understanding the Holocene rebound on the southwestern coast and (2) estimating the asthenosphere viscosity and depth beneath Iceland. Two stages of holocene evolution were determined by means of GPS profiles, morphological observations, and data compilation. The first stage corresponds to a vertical uplift of 67.5 to 157.5 m. It started at 10,000 years BP and ended at 8500 years BP implying uplift rates between 4.5 and 10.5 cm/a. It was a quick isostatic response to the fast ice retreat. The second stage had vertical motion of tens of meters with a probable tectonic origin and started at 8500 years BP. The uplift rate is 1 to 2 orders of magnitude slower than the one during the first stage. Uplift partitioning during the first stage was controlled by the thermal state of the lithosphere, the highest geothermal flux inducing the maximum uplift rates. The relaxation time for uplift provides a viscosity estimate of 5.45.8 — 1019 Pa s for the asthenosphere. This value is similar to those determined for glacial areas in different continental contexts. However, the flexural wavelength indicates a shallower asthenosphere than that occurring in continental domains. Therefore this study highlights a coupling between the thermal structure of the Icelandic asthenosphere and the glacial rebound. |
author2 |
Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS) Processus et bilan des domaines sédimentaires (PBDS) Université de Lille, Sciences et Technologies-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Biessy, Guillaume Dauteuil, Olivier van Vliet-Lanoë, Brigitte Wayolle, A. |
author_facet |
Biessy, Guillaume Dauteuil, Olivier van Vliet-Lanoë, Brigitte Wayolle, A. |
author_sort |
Biessy, Guillaume |
title |
Fast and partitioned postglacial rebound of southwestern Iceland |
title_short |
Fast and partitioned postglacial rebound of southwestern Iceland |
title_full |
Fast and partitioned postglacial rebound of southwestern Iceland |
title_fullStr |
Fast and partitioned postglacial rebound of southwestern Iceland |
title_full_unstemmed |
Fast and partitioned postglacial rebound of southwestern Iceland |
title_sort |
fast and partitioned postglacial rebound of southwestern iceland |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://insu.hal.science/insu-00286999 https://insu.hal.science/insu-00286999/document https://insu.hal.science/insu-00286999/file/Biessy_et_al-2008-Tectonics.pdf https://doi.org/10.1029/2007TC002177 |
geographic |
Mid-Atlantic Ridge |
geographic_facet |
Mid-Atlantic Ridge |
genre |
Ice cap Iceland |
genre_facet |
Ice cap Iceland |
op_source |
ISSN: 0278-7407 EISSN: 1944-9194 Tectonics https://insu.hal.science/insu-00286999 Tectonics, 2008, 27 (3), pp.TC3002. ⟨10.1029/2007TC002177⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2007TC002177 insu-00286999 https://insu.hal.science/insu-00286999 https://insu.hal.science/insu-00286999/document https://insu.hal.science/insu-00286999/file/Biessy_et_al-2008-Tectonics.pdf doi:10.1029/2007TC002177 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2007TC002177 |
container_title |
Tectonics |
container_volume |
27 |
container_issue |
3 |
container_start_page |
n/a |
op_container_end_page |
n/a |
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1772815301383028736 |