Climate change and erosion: view from northern Scandinavia.
International audience The impact of Quaternary glaciations is evidenced worldwide in mountains and may have induced an increase of erosion rates (accelerated erosion). Low-temperature thermochronometry has been extensively used to unravel the complex links between climate and erosion. However, unti...
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HAL CCSD
2018
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Online Access: | https://hal.science/hal-02930746 |
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ftunivnantes:oai:HAL:hal-02930746v1 |
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openpolar |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Lenard, S.J.P. Gautheron, Cécile Valla, Pierre Bingen, Bernard van Der Beek, Peter Loget, Nicolas Schwartz, Stéphane Pinna Jamme, Rosella Climate change and erosion: view from northern Scandinavia. |
topic_facet |
[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience The impact of Quaternary glaciations is evidenced worldwide in mountains and may have induced an increase of erosion rates (accelerated erosion). Low-temperature thermochronometry has been extensively used to unravel the complex links between climate and erosion. However, until now, only a limited number of studies detected accelerated erosion that can be interpreted as independent of tectonics and associated with climate change. In these conditions, will low-temperature yield any further advance in our understanding of the interactions between climate change and erosion? Here we discuss about a recent new and high-resolution apatite (U-Th-Sm)/He (AHe) dataset from northern Scandinavia, along the Norwegian Sea continental margin spanning from the Lofoten archipelago to the Tromsø area (68 to 70°N). The region presents dramatic alpine relief. The long-term evolution of the Norwegian margin results from the Caledonian orogeny followed by the Mesozoic rifting and offshore volcanism associated with the North-Atlantic oceanic breakup at c. 50-56 Ma. Bedrock samples were collected at sea-level and additional high-elevation samples were also collected to form elevation-profiles. The results were associated with available apatite fission-track data into inverse thermal modelling using QTQt. The dataset gives an unexpected insight on the extent and character of late Cenozoic erosion in North Scandinavia and the polar regions. A consistent set of AHe ages are younger than any published AFT or AHe ages at surface in Scandinavia (i.e. < 72 Ma). After a long period of tectonic exhumation derived from the Mesozoic rifting, the region underwent a long period with little erosion. Then, the dataset recorded a previously undetected phase of accelerated erosion since the Middle Miocene onwards. The results are interpreted as a consequence of efficient glacial processes, in the context of a gradual cooling of the North Atlantic, and point to Pre-Quaternary ice caps in northern Scandinavia, with a gradual ... |
author2 |
Centre de Recherches Pétrographiques et Géochimiques (CRPG) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) Géosciences Paris Saclay (GEOPS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Géosciences Paris Sud (GEOPS) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) Institut des Sciences de la Terre (ISTerre) Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Institut für Geologie Bern Universität Bern Bern (UNIBE) Geological Survey of Norway (NGU) Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA) Institut des Sciences de la Terre de Paris (iSTeP) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Lenard, S.J.P. Gautheron, Cécile Valla, Pierre Bingen, Bernard van Der Beek, Peter Loget, Nicolas Schwartz, Stéphane Pinna Jamme, Rosella |
author_facet |
Lenard, S.J.P. Gautheron, Cécile Valla, Pierre Bingen, Bernard van Der Beek, Peter Loget, Nicolas Schwartz, Stéphane Pinna Jamme, Rosella |
author_sort |
Lenard, S.J.P. |
title |
Climate change and erosion: view from northern Scandinavia. |
title_short |
Climate change and erosion: view from northern Scandinavia. |
title_full |
Climate change and erosion: view from northern Scandinavia. |
title_fullStr |
Climate change and erosion: view from northern Scandinavia. |
title_full_unstemmed |
Climate change and erosion: view from northern Scandinavia. |
title_sort |
climate change and erosion: view from northern scandinavia. |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-02930746 |
op_coverage |
Quedlinburg, Germany |
geographic |
Lofoten Norwegian Sea Tromsø |
geographic_facet |
Lofoten Norwegian Sea Tromsø |
genre |
Lofoten North Atlantic Norwegian Sea Tromsø |
genre_facet |
Lofoten North Atlantic Norwegian Sea Tromsø |
op_source |
Thermo, International Conference on Thermochronology https://hal.science/hal-02930746 Thermo, International Conference on Thermochronology, Sep 2018, Quedlinburg, Germany |
op_relation |
hal-02930746 https://hal.science/hal-02930746 |
_version_ |
1766064062036180992 |
spelling |
ftunivnantes:oai:HAL:hal-02930746v1 2023-05-15T17:08:20+02:00 Climate change and erosion: view from northern Scandinavia. Lenard, S.J.P. Gautheron, Cécile Valla, Pierre Bingen, Bernard van Der Beek, Peter Loget, Nicolas Schwartz, Stéphane Pinna Jamme, Rosella Centre de Recherches Pétrographiques et Géochimiques (CRPG) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) Géosciences Paris Saclay (GEOPS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Géosciences Paris Sud (GEOPS) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) Institut des Sciences de la Terre (ISTerre) Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Institut für Geologie Bern Universität Bern Bern (UNIBE) Geological Survey of Norway (NGU) Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA) Institut des Sciences de la Terre de Paris (iSTeP) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Quedlinburg, Germany 2018-09 https://hal.science/hal-02930746 en eng HAL CCSD hal-02930746 https://hal.science/hal-02930746 Thermo, International Conference on Thermochronology https://hal.science/hal-02930746 Thermo, International Conference on Thermochronology, Sep 2018, Quedlinburg, Germany [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/conferenceObject Conference papers 2018 ftunivnantes 2023-02-08T05:27:04Z International audience The impact of Quaternary glaciations is evidenced worldwide in mountains and may have induced an increase of erosion rates (accelerated erosion). Low-temperature thermochronometry has been extensively used to unravel the complex links between climate and erosion. However, until now, only a limited number of studies detected accelerated erosion that can be interpreted as independent of tectonics and associated with climate change. In these conditions, will low-temperature yield any further advance in our understanding of the interactions between climate change and erosion? Here we discuss about a recent new and high-resolution apatite (U-Th-Sm)/He (AHe) dataset from northern Scandinavia, along the Norwegian Sea continental margin spanning from the Lofoten archipelago to the Tromsø area (68 to 70°N). The region presents dramatic alpine relief. The long-term evolution of the Norwegian margin results from the Caledonian orogeny followed by the Mesozoic rifting and offshore volcanism associated with the North-Atlantic oceanic breakup at c. 50-56 Ma. Bedrock samples were collected at sea-level and additional high-elevation samples were also collected to form elevation-profiles. The results were associated with available apatite fission-track data into inverse thermal modelling using QTQt. The dataset gives an unexpected insight on the extent and character of late Cenozoic erosion in North Scandinavia and the polar regions. A consistent set of AHe ages are younger than any published AFT or AHe ages at surface in Scandinavia (i.e. < 72 Ma). After a long period of tectonic exhumation derived from the Mesozoic rifting, the region underwent a long period with little erosion. Then, the dataset recorded a previously undetected phase of accelerated erosion since the Middle Miocene onwards. The results are interpreted as a consequence of efficient glacial processes, in the context of a gradual cooling of the North Atlantic, and point to Pre-Quaternary ice caps in northern Scandinavia, with a gradual ... Conference Object Lofoten North Atlantic Norwegian Sea Tromsø Université de Nantes: HAL-UNIV-NANTES Lofoten Norwegian Sea Tromsø |