Denudation rates during a postglacial sequence in Northern Iceland: example of Laxárdalur valley in the Skagafjörður area
International audience For several decades, geomorphologists have focused on the functioning of geomorphic systems after deglaciation. The relative importance of paraglacial vs. periglacial processes has been highly debated. At present, the development of dating techniques allows to contribute to th...
Published in: | Geografiska Annaler: Series A, Physical Geography |
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Main Authors: | , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2017
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Subjects: | |
Online Access: | https://hal.science/hal-01534745 https://doi.org/10.1080/04353676.2017.1327320 |
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Open Polar |
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Portail HAL de l'Université Lumière Lyon 2 |
op_collection_id |
ftunivlyon2 |
language |
English |
topic |
Rockglacier Landslide Denudation rates Slope Paraglacial Periglacial Holocene [SHS.GEO]Humanities and Social Sciences/Geography |
spellingShingle |
Rockglacier Landslide Denudation rates Slope Paraglacial Periglacial Holocene [SHS.GEO]Humanities and Social Sciences/Geography Cossart, Etienne Mercier, Denis Coquin, Julien Decaulne, Armelle Feuillet, Thierry Jónsson, Helgi Páll Sæmundsson, Þorsteinn Denudation rates during a postglacial sequence in Northern Iceland: example of Laxárdalur valley in the Skagafjörður area |
topic_facet |
Rockglacier Landslide Denudation rates Slope Paraglacial Periglacial Holocene [SHS.GEO]Humanities and Social Sciences/Geography |
description |
International audience For several decades, geomorphologists have focused on the functioning of geomorphic systems after deglaciation. The relative importance of paraglacial vs. periglacial processes has been highly debated. At present, the development of dating techniques allows to contribute to this debate. We reconstruct in this paper the geomorphic evolution of Tindastóll mountain slopes in Laxárdalur valley (Skagafjörður area, central northern Iceland), where a chronological framework can be established through tephrochronology and an assemblage of dated raised beaches. Volumetric calculations of constructed and excavated landforms were created from field data and from DEM and geographical information system techniques. Collectively, our data exhibit a first stage of paraglacial landsliding during the first half of the Holocene, followed by a stage of scree and rockglacier development (during the second half of the Holocene, but before 1100 AD). Our estimations indicate that more than 85% of the total sediment production were due to rock slope failure, and the rate of bedrock denudation due to periglacial processes was about one half of the rate of paraglacial processes. Nevertheless, paraglacial and periglacial processes cannot be seen here as antagonistic processes: they are organized in a sequence during which periglacial processes are conditioned (enhancement of bedrock denudation rates) by fracturing and consequent mass wasting. Screes and concomitant rockglaciers were indeed preconditioned by the landslide, while areas non-affected by landslides have remained mostly intact, characterized by a very low rate of accumulation due to geomorphic (periglacial) activity. |
author2 |
Environnement, Ville, Société (EVS) École normale supérieure de Lyon (ENS de Lyon)-École des Mines de Saint-Étienne (Mines Saint-Étienne MSE) Institut Mines-Télécom Paris (IMT)-Institut Mines-Télécom Paris (IMT)-Université Lumière - Lyon 2 (UL2)-Université Jean Moulin - Lyon 3 (UJML) Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon) Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-École Nationale des Travaux Publics de l'État (ENTPE)-École nationale supérieure d'architecture de Lyon (ENSAL)-Centre National de la Recherche Scientifique (CNRS) Université Jean Moulin - Lyon 3 (UJML) Université de Lyon Espaces, Nature et Culture (ENeC) Université Paris-Sorbonne (UP4)-Centre National de la Recherche Scientifique (CNRS) Université Paris-Sorbonne (UP4) Littoral, Environnement, Télédétection, Géomatique (LETG - Nantes) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Brest (UBO)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (IGARUN) Université de Nantes (UN)-Université de Nantes (UN) Littoral, Environnement, Télédétection, Géomatique UMR 6554 (LETG) Normandie Université (NU)-Normandie Université (NU)-Université d'Angers (UA)-École Pratique des Hautes Études (EPHE) 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) Université Paris 8 Vincennes-Saint-Denis (UP8) IUF |
format |
Article in Journal/Newspaper |
author |
Cossart, Etienne Mercier, Denis Coquin, Julien Decaulne, Armelle Feuillet, Thierry Jónsson, Helgi Páll Sæmundsson, Þorsteinn |
author_facet |
Cossart, Etienne Mercier, Denis Coquin, Julien Decaulne, Armelle Feuillet, Thierry Jónsson, Helgi Páll Sæmundsson, Þorsteinn |
author_sort |
Cossart, Etienne |
title |
Denudation rates during a postglacial sequence in Northern Iceland: example of Laxárdalur valley in the Skagafjörður area |
title_short |
Denudation rates during a postglacial sequence in Northern Iceland: example of Laxárdalur valley in the Skagafjörður area |
title_full |
Denudation rates during a postglacial sequence in Northern Iceland: example of Laxárdalur valley in the Skagafjörður area |
title_fullStr |
Denudation rates during a postglacial sequence in Northern Iceland: example of Laxárdalur valley in the Skagafjörður area |
title_full_unstemmed |
Denudation rates during a postglacial sequence in Northern Iceland: example of Laxárdalur valley in the Skagafjörður area |
title_sort |
denudation rates during a postglacial sequence in northern iceland: example of laxárdalur valley in the skagafjörður area |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.science/hal-01534745 https://doi.org/10.1080/04353676.2017.1327320 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
ISSN: 0435-3676 EISSN: 1468-0459 Geografiska Annaler: Series A, Physical Geography https://hal.science/hal-01534745 Geografiska Annaler: Series A, Physical Geography, 2017, 99 (3), pp.240-261. ⟨10.1080/04353676.2017.1327320⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1080/04353676.2017.1327320 hal-01534745 https://hal.science/hal-01534745 doi:10.1080/04353676.2017.1327320 |
op_doi |
https://doi.org/10.1080/04353676.2017.1327320 |
container_title |
Geografiska Annaler: Series A, Physical Geography |
container_volume |
99 |
container_issue |
3 |
container_start_page |
240 |
op_container_end_page |
261 |
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1799482381451657216 |
spelling |
ftunivlyon2:oai:HAL:hal-01534745v1 2024-05-19T07:42:41+00:00 Denudation rates during a postglacial sequence in Northern Iceland: example of Laxárdalur valley in the Skagafjörður area Cossart, Etienne Mercier, Denis Coquin, Julien Decaulne, Armelle Feuillet, Thierry Jónsson, Helgi Páll Sæmundsson, Þorsteinn Environnement, Ville, Société (EVS) École normale supérieure de Lyon (ENS de Lyon)-École des Mines de Saint-Étienne (Mines Saint-Étienne MSE) Institut Mines-Télécom Paris (IMT)-Institut Mines-Télécom Paris (IMT)-Université Lumière - Lyon 2 (UL2)-Université Jean Moulin - Lyon 3 (UJML) Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon) Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-École Nationale des Travaux Publics de l'État (ENTPE)-École nationale supérieure d'architecture de Lyon (ENSAL)-Centre National de la Recherche Scientifique (CNRS) Université Jean Moulin - Lyon 3 (UJML) Université de Lyon Espaces, Nature et Culture (ENeC) Université Paris-Sorbonne (UP4)-Centre National de la Recherche Scientifique (CNRS) Université Paris-Sorbonne (UP4) Littoral, Environnement, Télédétection, Géomatique (LETG - Nantes) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Brest (UBO)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (IGARUN) Université de Nantes (UN)-Université de Nantes (UN) Littoral, Environnement, Télédétection, Géomatique UMR 6554 (LETG) Normandie Université (NU)-Normandie Université (NU)-Université d'Angers (UA)-École Pratique des Hautes Études (EPHE) 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) Université Paris 8 Vincennes-Saint-Denis (UP8) IUF 2017-05-03 https://hal.science/hal-01534745 https://doi.org/10.1080/04353676.2017.1327320 en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1080/04353676.2017.1327320 hal-01534745 https://hal.science/hal-01534745 doi:10.1080/04353676.2017.1327320 ISSN: 0435-3676 EISSN: 1468-0459 Geografiska Annaler: Series A, Physical Geography https://hal.science/hal-01534745 Geografiska Annaler: Series A, Physical Geography, 2017, 99 (3), pp.240-261. ⟨10.1080/04353676.2017.1327320⟩ Rockglacier Landslide Denudation rates Slope Paraglacial Periglacial Holocene [SHS.GEO]Humanities and Social Sciences/Geography info:eu-repo/semantics/article Journal articles 2017 ftunivlyon2 https://doi.org/10.1080/04353676.2017.1327320 2024-04-22T00:50:50Z International audience For several decades, geomorphologists have focused on the functioning of geomorphic systems after deglaciation. The relative importance of paraglacial vs. periglacial processes has been highly debated. At present, the development of dating techniques allows to contribute to this debate. We reconstruct in this paper the geomorphic evolution of Tindastóll mountain slopes in Laxárdalur valley (Skagafjörður area, central northern Iceland), where a chronological framework can be established through tephrochronology and an assemblage of dated raised beaches. Volumetric calculations of constructed and excavated landforms were created from field data and from DEM and geographical information system techniques. Collectively, our data exhibit a first stage of paraglacial landsliding during the first half of the Holocene, followed by a stage of scree and rockglacier development (during the second half of the Holocene, but before 1100 AD). Our estimations indicate that more than 85% of the total sediment production were due to rock slope failure, and the rate of bedrock denudation due to periglacial processes was about one half of the rate of paraglacial processes. Nevertheless, paraglacial and periglacial processes cannot be seen here as antagonistic processes: they are organized in a sequence during which periglacial processes are conditioned (enhancement of bedrock denudation rates) by fracturing and consequent mass wasting. Screes and concomitant rockglaciers were indeed preconditioned by the landslide, while areas non-affected by landslides have remained mostly intact, characterized by a very low rate of accumulation due to geomorphic (periglacial) activity. Article in Journal/Newspaper Iceland Portail HAL de l'Université Lumière Lyon 2 Geografiska Annaler: Series A, Physical Geography 99 3 240 261 |