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 |
---|---|
Main Authors: | , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2017
|
Subjects: | |
Online Access: | https://doi.org/10.1080/04353676.2017.1327320 https://hal.archives-ouvertes.fr/hal-01534745 |
id |
fttriple:oai:gotriple.eu:10670/1.q9va61 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
Holocene Denudation rates Slope Paraglacial Periglacial Landslide Rockglacier geo envir |
spellingShingle |
Holocene Denudation rates Slope Paraglacial Periglacial Landslide Rockglacier geo envir 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 |
Holocene Denudation rates Slope Paraglacial Periglacial Landslide Rockglacier geo envir |
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) Institut National des Sciences Appliquées de Lyon (INSA Lyon) Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-École nationale supérieure d'architecture de Lyon (ENSAL)-École des Mines de Saint-Étienne (Mines Saint-Étienne MSE) Institut Mines-Télécom Paris (IMT)-Institut Mines-Télécom Paris (IMT)-École Nationale des Travaux Publics de l'État (ENTPE)-Université Jean Monnet Saint-Étienne (UJM)-Université Jean Moulin - Lyon 3 (UJML) Université de Lyon-Université Lumière - Lyon 2 (UL2)-École normale supérieure - Lyon (ENS Lyon) 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) Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (IGARUN) Université de Nantes (UN)-Université de Nantes (UN)-Université de Rennes 2 (UR2) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Université de Brest (UBO)-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)-Centre National de la Recherche Scientifique (CNRS) Littoral, Environnement, Télédétection, Géomatique UMR 6554 (LETG) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Université d'Angers (UA)-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) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-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) 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://doi.org/10.1080/04353676.2017.1327320 https://hal.archives-ouvertes.fr/hal-01534745 |
long_lat |
ENVELOPE(-15.509,-15.509,66.150,66.150) ENVELOPE(-19.561,-19.561,65.875,65.875) ENVELOPE(-19.766,-19.766,65.837,65.837) |
geographic |
Laxárdalur Skagafjörður Tindastóll |
geographic_facet |
Laxárdalur Skagafjörður Tindastóll |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0435-3676 EISSN: 1468-0459 Geografiska Annaler: Series A, Physical Geography Geografiska Annaler: Series A, Physical Geography, Wiley, 2017, 99 (3), pp.240-261. ⟨10.1080/04353676.2017.1327320⟩ |
op_relation |
hal-01534745 doi:10.1080/04353676.2017.1327320 10670/1.q9va61 https://hal.archives-ouvertes.fr/hal-01534745 |
op_rights |
undefined |
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 |
_version_ |
1766038628504436736 |
spelling |
fttriple:oai:gotriple.eu:10670/1.q9va61 2023-05-15T16:48:33+02:00 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) Institut National des Sciences Appliquées de Lyon (INSA Lyon) Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-École nationale supérieure d'architecture de Lyon (ENSAL)-École des Mines de Saint-Étienne (Mines Saint-Étienne MSE) Institut Mines-Télécom Paris (IMT)-Institut Mines-Télécom Paris (IMT)-École Nationale des Travaux Publics de l'État (ENTPE)-Université Jean Monnet Saint-Étienne (UJM)-Université Jean Moulin - Lyon 3 (UJML) Université de Lyon-Université Lumière - Lyon 2 (UL2)-École normale supérieure - Lyon (ENS Lyon) 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) Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (IGARUN) Université de Nantes (UN)-Université de Nantes (UN)-Université de Rennes 2 (UR2) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Université de Brest (UBO)-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)-Centre National de la Recherche Scientifique (CNRS) Littoral, Environnement, Télédétection, Géomatique UMR 6554 (LETG) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Université d'Angers (UA)-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) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-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) 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://doi.org/10.1080/04353676.2017.1327320 https://hal.archives-ouvertes.fr/hal-01534745 en eng HAL CCSD Wiley hal-01534745 doi:10.1080/04353676.2017.1327320 10670/1.q9va61 https://hal.archives-ouvertes.fr/hal-01534745 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0435-3676 EISSN: 1468-0459 Geografiska Annaler: Series A, Physical Geography Geografiska Annaler: Series A, Physical Geography, Wiley, 2017, 99 (3), pp.240-261. ⟨10.1080/04353676.2017.1327320⟩ Holocene Denudation rates Slope Paraglacial Periglacial Landslide Rockglacier geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2017 fttriple https://doi.org/10.1080/04353676.2017.1327320 2023-01-22T18:35:30Z 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 Unknown Laxárdalur ENVELOPE(-15.509,-15.509,66.150,66.150) Skagafjörður ENVELOPE(-19.561,-19.561,65.875,65.875) Tindastóll ENVELOPE(-19.766,-19.766,65.837,65.837) Geografiska Annaler: Series A, Physical Geography 99 3 240 261 |