Are Icelandic rock-slope failures paraglacial? Age evaluation of seventeen rock-slope failures in the Skagafjörður area, based on geomorphological stacking, radiocarbon dating and tephrochronology
International audience In Iceland there are numerous rock-slope failures, especially in the Tertiary basaltic formations of the northern, eastern and northwestern regions. The temporal pattern of rock-slope failures is fundamental for understanding post-glacial events. In the Skagafjörður district,...
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Online Access: | https://doi.org/10.1016/j.geomorph.2017.08.011 https://halshs.archives-ouvertes.fr/halshs-01591969 |
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fttriple:oai:gotriple.eu:10670/1.cbneyo 2023-05-15T16:47:32+02:00 Are Icelandic rock-slope failures paraglacial? Age evaluation of seventeen rock-slope failures in the Skagafjörður area, based on geomorphological stacking, radiocarbon dating and tephrochronology Mercier, Denis Coquin, Julien Feuillet, Thierry Decaulne, Armelle Cossart, Etienne Jónsson, Helgi Pall Sæmundsson, Þorstein Laboratoire Dynamiques Sociales et Recomposition des Espaces (LADYSS) Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) 2017-01-01 https://doi.org/10.1016/j.geomorph.2017.08.011 https://halshs.archives-ouvertes.fr/halshs-01591969 en eng HAL CCSD Elsevier halshs-01591969 doi:10.1016/j.geomorph.2017.08.011 10670/1.cbneyo https://halshs.archives-ouvertes.fr/halshs-01591969 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0169-555X Geomorphology Geomorphology, Elsevier, 2017, ⟨10.1016/j.geomorph.2017.08.011⟩ Landslide Deglaciation Holocene Paraglacial geomorphology Iceland geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2017 fttriple https://doi.org/10.1016/j.geomorph.2017.08.011 2023-01-22T16:32:19Z International audience In Iceland there are numerous rock-slope failures, especially in the Tertiary basaltic formations of the northern, eastern and northwestern regions. The temporal pattern of rock-slope failures is fundamental for understanding post-glacial events. In the Skagafjörður district, central northern Iceland, 17 rock-slope failures were investigated to determine the age of their occurrence. A geomorphic survey was carried out to identify and characterize landform units, both on the rock-slope failures and in their immediate vicinity. In this coastal area, we used geomorphological stacking which included the relationship between rock-slope failures and raised beaches caused by glacial isostatic rebounds, the chronology of which was established in previous studies. We searched for depressions on the rock-slope failures to then excavate a series of pits and map the stratigraphy. The resulting stratigraphic framework was then validated using (i) radiocarbon dating of wood remains, and (ii) tephrochronology, both of which were complemented by age-depth model calibration. The results confirm that all the rock-slope failures potentially occurred before the Boreal (8 ka), while 94% occurred before the Preboreal (10 ka). They all potentially occurred after the glacial retreat following the maximal ice extent and the Preboreal. More precisely, 11 of them potentially occurred between the Preboreal and the first half of the Holocene. This study demonstrates the relationship between the deglaciation and destabilization of slopes during the paraglacial phase (debuttressing, decompression, glacial isostatic rebound, seismic activity, etc.), which are also controlling factors favouring landsliding, but are difficult to identify for each individual rock-slope failure. Article in Journal/Newspaper Iceland Unknown Skagafjörður ENVELOPE(-19.561,-19.561,65.875,65.875) Geomorphology 296 45 58 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
Landslide Deglaciation Holocene Paraglacial geomorphology Iceland geo envir |
spellingShingle |
Landslide Deglaciation Holocene Paraglacial geomorphology Iceland geo envir Mercier, Denis Coquin, Julien Feuillet, Thierry Decaulne, Armelle Cossart, Etienne Jónsson, Helgi Pall Sæmundsson, Þorstein Are Icelandic rock-slope failures paraglacial? Age evaluation of seventeen rock-slope failures in the Skagafjörður area, based on geomorphological stacking, radiocarbon dating and tephrochronology |
topic_facet |
Landslide Deglaciation Holocene Paraglacial geomorphology Iceland geo envir |
description |
International audience In Iceland there are numerous rock-slope failures, especially in the Tertiary basaltic formations of the northern, eastern and northwestern regions. The temporal pattern of rock-slope failures is fundamental for understanding post-glacial events. In the Skagafjörður district, central northern Iceland, 17 rock-slope failures were investigated to determine the age of their occurrence. A geomorphic survey was carried out to identify and characterize landform units, both on the rock-slope failures and in their immediate vicinity. In this coastal area, we used geomorphological stacking which included the relationship between rock-slope failures and raised beaches caused by glacial isostatic rebounds, the chronology of which was established in previous studies. We searched for depressions on the rock-slope failures to then excavate a series of pits and map the stratigraphy. The resulting stratigraphic framework was then validated using (i) radiocarbon dating of wood remains, and (ii) tephrochronology, both of which were complemented by age-depth model calibration. The results confirm that all the rock-slope failures potentially occurred before the Boreal (8 ka), while 94% occurred before the Preboreal (10 ka). They all potentially occurred after the glacial retreat following the maximal ice extent and the Preboreal. More precisely, 11 of them potentially occurred between the Preboreal and the first half of the Holocene. This study demonstrates the relationship between the deglaciation and destabilization of slopes during the paraglacial phase (debuttressing, decompression, glacial isostatic rebound, seismic activity, etc.), which are also controlling factors favouring landsliding, but are difficult to identify for each individual rock-slope failure. |
author2 |
Laboratoire Dynamiques Sociales et Recomposition des Espaces (LADYSS) Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris 8 Vincennes-Saint-Denis (UP8)-Université Paris Nanterre (UPN)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Mercier, Denis Coquin, Julien Feuillet, Thierry Decaulne, Armelle Cossart, Etienne Jónsson, Helgi Pall Sæmundsson, Þorstein |
author_facet |
Mercier, Denis Coquin, Julien Feuillet, Thierry Decaulne, Armelle Cossart, Etienne Jónsson, Helgi Pall Sæmundsson, Þorstein |
author_sort |
Mercier, Denis |
title |
Are Icelandic rock-slope failures paraglacial? Age evaluation of seventeen rock-slope failures in the Skagafjörður area, based on geomorphological stacking, radiocarbon dating and tephrochronology |
title_short |
Are Icelandic rock-slope failures paraglacial? Age evaluation of seventeen rock-slope failures in the Skagafjörður area, based on geomorphological stacking, radiocarbon dating and tephrochronology |
title_full |
Are Icelandic rock-slope failures paraglacial? Age evaluation of seventeen rock-slope failures in the Skagafjörður area, based on geomorphological stacking, radiocarbon dating and tephrochronology |
title_fullStr |
Are Icelandic rock-slope failures paraglacial? Age evaluation of seventeen rock-slope failures in the Skagafjörður area, based on geomorphological stacking, radiocarbon dating and tephrochronology |
title_full_unstemmed |
Are Icelandic rock-slope failures paraglacial? Age evaluation of seventeen rock-slope failures in the Skagafjörður area, based on geomorphological stacking, radiocarbon dating and tephrochronology |
title_sort |
are icelandic rock-slope failures paraglacial? age evaluation of seventeen rock-slope failures in the skagafjörður area, based on geomorphological stacking, radiocarbon dating and tephrochronology |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://doi.org/10.1016/j.geomorph.2017.08.011 https://halshs.archives-ouvertes.fr/halshs-01591969 |
long_lat |
ENVELOPE(-19.561,-19.561,65.875,65.875) |
geographic |
Skagafjörður |
geographic_facet |
Skagafjörður |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0169-555X Geomorphology Geomorphology, Elsevier, 2017, ⟨10.1016/j.geomorph.2017.08.011⟩ |
op_relation |
halshs-01591969 doi:10.1016/j.geomorph.2017.08.011 10670/1.cbneyo https://halshs.archives-ouvertes.fr/halshs-01591969 |
op_rights |
undefined |
op_doi |
https://doi.org/10.1016/j.geomorph.2017.08.011 |
container_title |
Geomorphology |
container_volume |
296 |
container_start_page |
45 |
op_container_end_page |
58 |
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1766037629128671232 |