Schmidt-hammer exposure-age dating of seven paraglacial rock-slope failures in the Bolungarvík-Suðureyri area (Westfjords, Iceland)
International audience Many rock-slope failures (RSF) impact Iceland's Westfjords morphology. Five RSF areas, totalling seven RSFs, were studied in the western fjords around Bolungarvík-Suðureyri: Óshólar, Minni-Hlið, Meira-Hraun, the Vatnadalur valley and part of the Sunddalur valley.The aim o...
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Online Access: | https://hal.science/hal-04563727 https://doi.org/10.1016/j.geomorph.2024.109230 |
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ftsorbonneuniv:oai:HAL:hal-04563727v1 2024-05-19T07:38:27+00:00 Schmidt-hammer exposure-age dating of seven paraglacial rock-slope failures in the Bolungarvík-Suðureyri area (Westfjords, Iceland) Portier, Emilie Mercier, Denis Decaulne, Armelle Cossart, Etienne Laboratoire de géographie physique : Environnements Quaternaires et Actuels (LGP) Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS) Sorbonne Université (SU) Institut Polaire Français Paul-Emile Victor (PR 1266 PARI) 2024-04 https://hal.science/hal-04563727 https://doi.org/10.1016/j.geomorph.2024.109230 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geomorph.2024.109230 hal-04563727 https://hal.science/hal-04563727 doi:10.1016/j.geomorph.2024.109230 ISSN: 0169-555X Geomorphology https://hal.science/hal-04563727 Geomorphology, 2024, pp.109230. ⟨10.1016/j.geomorph.2024.109230⟩ https://doi.org/10.1016/j.geomorph.2024.109230 [SHS.GEO]Humanities and Social Sciences/Geography [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2024 ftsorbonneuniv https://doi.org/10.1016/j.geomorph.2024.109230 2024-05-02T02:02:54Z International audience Many rock-slope failures (RSF) impact Iceland's Westfjords morphology. Five RSF areas, totalling seven RSFs, were studied in the western fjords around Bolungarvík-Suðureyri: Óshólar, Minni-Hlið, Meira-Hraun, the Vatnadalur valley and part of the Sunddalur valley.The aim of this article is to provide chronological data of the RSFs and to subsequently obtain a better chronosequence of post-glacial events, none of which have yet been dated in the Westfjords. More particularly, we discuss a paraglacial hypothesis of their occurrence.For this purpose, the Schmidt-hammer exposure-age dating (SHD) method is used on the RSF deposits, and the rebound values obtained from the impacted blocks are converted to age estimates using radiocarbon ages obtained from the different sites in order to calculate a SHD age calibration. Then, we establish a chronology of the setting up of the events. In this way, seven RSFs have been dated and different chronological generations of deposit emplacement have been exhibited for some of them. Thus, various periods of instability affected mountain slopes. The Óshólar RSF is thought to have been deposited firstly at around 12,500 cal BP, the Minni-Hlið RSF at ~9800 cal BP, the Meira-Hraun RSF at ~8700 cal BP, the Vatnadalur RSFs at ~9000 cal BP, ~ 6900 cal BP, and ~ 4300 cal BP, and the Sunddalur RSF at ~9600 cal BP. These RSFs therefore correspond to so-called paraglacial events, which took place at the beginning of deglaciation of the area during the first half of the Holocene. Article in Journal/Newspaper Bolungarvík Iceland HAL Sorbonne Université Geomorphology 457 109230 |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
[SHS.GEO]Humanities and Social Sciences/Geography [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SHS.GEO]Humanities and Social Sciences/Geography [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Portier, Emilie Mercier, Denis Decaulne, Armelle Cossart, Etienne Schmidt-hammer exposure-age dating of seven paraglacial rock-slope failures in the Bolungarvík-Suðureyri area (Westfjords, Iceland) |
topic_facet |
[SHS.GEO]Humanities and Social Sciences/Geography [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience Many rock-slope failures (RSF) impact Iceland's Westfjords morphology. Five RSF areas, totalling seven RSFs, were studied in the western fjords around Bolungarvík-Suðureyri: Óshólar, Minni-Hlið, Meira-Hraun, the Vatnadalur valley and part of the Sunddalur valley.The aim of this article is to provide chronological data of the RSFs and to subsequently obtain a better chronosequence of post-glacial events, none of which have yet been dated in the Westfjords. More particularly, we discuss a paraglacial hypothesis of their occurrence.For this purpose, the Schmidt-hammer exposure-age dating (SHD) method is used on the RSF deposits, and the rebound values obtained from the impacted blocks are converted to age estimates using radiocarbon ages obtained from the different sites in order to calculate a SHD age calibration. Then, we establish a chronology of the setting up of the events. In this way, seven RSFs have been dated and different chronological generations of deposit emplacement have been exhibited for some of them. Thus, various periods of instability affected mountain slopes. The Óshólar RSF is thought to have been deposited firstly at around 12,500 cal BP, the Minni-Hlið RSF at ~9800 cal BP, the Meira-Hraun RSF at ~8700 cal BP, the Vatnadalur RSFs at ~9000 cal BP, ~ 6900 cal BP, and ~ 4300 cal BP, and the Sunddalur RSF at ~9600 cal BP. These RSFs therefore correspond to so-called paraglacial events, which took place at the beginning of deglaciation of the area during the first half of the Holocene. |
author2 |
Laboratoire de géographie physique : Environnements Quaternaires et Actuels (LGP) Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS) Sorbonne Université (SU) Institut Polaire Français Paul-Emile Victor (PR 1266 PARI) |
format |
Article in Journal/Newspaper |
author |
Portier, Emilie Mercier, Denis Decaulne, Armelle Cossart, Etienne |
author_facet |
Portier, Emilie Mercier, Denis Decaulne, Armelle Cossart, Etienne |
author_sort |
Portier, Emilie |
title |
Schmidt-hammer exposure-age dating of seven paraglacial rock-slope failures in the Bolungarvík-Suðureyri area (Westfjords, Iceland) |
title_short |
Schmidt-hammer exposure-age dating of seven paraglacial rock-slope failures in the Bolungarvík-Suðureyri area (Westfjords, Iceland) |
title_full |
Schmidt-hammer exposure-age dating of seven paraglacial rock-slope failures in the Bolungarvík-Suðureyri area (Westfjords, Iceland) |
title_fullStr |
Schmidt-hammer exposure-age dating of seven paraglacial rock-slope failures in the Bolungarvík-Suðureyri area (Westfjords, Iceland) |
title_full_unstemmed |
Schmidt-hammer exposure-age dating of seven paraglacial rock-slope failures in the Bolungarvík-Suðureyri area (Westfjords, Iceland) |
title_sort |
schmidt-hammer exposure-age dating of seven paraglacial rock-slope failures in the bolungarvík-suðureyri area (westfjords, iceland) |
publisher |
HAL CCSD |
publishDate |
2024 |
url |
https://hal.science/hal-04563727 https://doi.org/10.1016/j.geomorph.2024.109230 |
genre |
Bolungarvík Iceland |
genre_facet |
Bolungarvík Iceland |
op_source |
ISSN: 0169-555X Geomorphology https://hal.science/hal-04563727 Geomorphology, 2024, pp.109230. ⟨10.1016/j.geomorph.2024.109230⟩ https://doi.org/10.1016/j.geomorph.2024.109230 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geomorph.2024.109230 hal-04563727 https://hal.science/hal-04563727 doi:10.1016/j.geomorph.2024.109230 |
op_doi |
https://doi.org/10.1016/j.geomorph.2024.109230 |
container_title |
Geomorphology |
container_volume |
457 |
container_start_page |
109230 |
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1799477897405136896 |