What can we learn from ice collected in high mountain rockfall scars? Three examples from the Mont Blanc massif (France)
International audience The study of the ice (cryostructures, cryostratigraphy, types and age) that partly fills the fractures in rockwall permafrost is necessary to better understand the increasing frequency/volume of rockfalls in the high alpine rockwalls. Typically inaccessible, this ice is visibl...
Published in: | Earth Surface Processes and Landforms |
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ftunivnantes:oai:HAL:hal-02440776v1 2023-05-15T16:36:39+02:00 What can we learn from ice collected in high mountain rockfall scars? Three examples from the Mont Blanc massif (France) Magnin, Florence Ravanel, Ludovic Guillet, Grégoire Montagnat, Maurine Preunkert, Susanne Duvillard, P.A Deline, Philip Pallandre, François Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Institut de gestion des entreprises -USJ (IGE) Université Saint-Joseph de Beyrouth (USJ) Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Ecole nationale de ski et d'alpinisme Queenstown, New Zealand 2019-12-04 https://hal.science/hal-02440776 https://hal.science/hal-02440776/document https://doi.org/10.1002/esp.3992 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.1002/esp.3992 hal-02440776 https://hal.science/hal-02440776 https://hal.science/hal-02440776/document doi:10.1002/esp.3992 First Southern Hemisphere Conference on Permafrost - SouthCOP2019 https://hal.science/hal-02440776 First Southern Hemisphere Conference on Permafrost - SouthCOP2019, Dec 2019, Queenstown, New Zealand. 42, pp.426 - 438, 2016, ⟨10.1002/esp.3992⟩ [SDE.ES]Environmental Sciences/Environmental and Society [SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/conferenceObject Conference poster 2019 ftunivnantes https://doi.org/10.1002/esp.3992 2023-03-01T02:51:04Z International audience The study of the ice (cryostructures, cryostratigraphy, types and age) that partly fills the fractures in rockwall permafrost is necessary to better understand the increasing frequency/volume of rockfalls in the high alpine rockwalls. Typically inaccessible, this ice is visible only when a rockfall occurs, exposing previously hidden ice. Over the past two years, the two largest rockfalls of the decade in the Mont Blanc massif and a smaller one allowed to start the documentation of the rockwall permafrost ice. This poster aims to present the three cases. Up to now, dating has been carried out for only one of the three cases. How to date permafrost ice? Dating ice cores from alpine glaciers has shown the wide time span covered by these, from a few decades to several thousand years. Several dating methods are available to quantify the age. Counting the annual layers, which proved to be effective, is widely used in the study of mountain glaciers but cannot be used for the internal ice of the permafrost since it does not present these annual layers. Structure of the ice in the scar of the Trident of Tacul rockfall scar shows nevertheless a series of layers. We will therefore use radionuclide dating to obtain the absolute age of the ice. So far, only one age is available for interstitial ice from permafrost-affected rockwall: the ice sampled from a felt block that is part of the deposit of the 150'000 m 3 rockfall that occurred in Feb. 2014 at Piz Kesch (Swiss Alps; Conference Object Ice permafrost Université de Nantes: HAL-UNIV-NANTES Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) New Zealand The Trident ENVELOPE(-37.083,-37.083,-54.167,-54.167) Trident ENVELOPE(169.233,169.233,-72.433,-72.433) Earth Surface Processes and Landforms 42 3 426 438 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDE.ES]Environmental Sciences/Environmental and Society [SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[SDE.ES]Environmental Sciences/Environmental and Society [SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes Magnin, Florence Ravanel, Ludovic Guillet, Grégoire Montagnat, Maurine Preunkert, Susanne Duvillard, P.A Deline, Philip Pallandre, François What can we learn from ice collected in high mountain rockfall scars? Three examples from the Mont Blanc massif (France) |
topic_facet |
[SDE.ES]Environmental Sciences/Environmental and Society [SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience The study of the ice (cryostructures, cryostratigraphy, types and age) that partly fills the fractures in rockwall permafrost is necessary to better understand the increasing frequency/volume of rockfalls in the high alpine rockwalls. Typically inaccessible, this ice is visible only when a rockfall occurs, exposing previously hidden ice. Over the past two years, the two largest rockfalls of the decade in the Mont Blanc massif and a smaller one allowed to start the documentation of the rockwall permafrost ice. This poster aims to present the three cases. Up to now, dating has been carried out for only one of the three cases. How to date permafrost ice? Dating ice cores from alpine glaciers has shown the wide time span covered by these, from a few decades to several thousand years. Several dating methods are available to quantify the age. Counting the annual layers, which proved to be effective, is widely used in the study of mountain glaciers but cannot be used for the internal ice of the permafrost since it does not present these annual layers. Structure of the ice in the scar of the Trident of Tacul rockfall scar shows nevertheless a series of layers. We will therefore use radionuclide dating to obtain the absolute age of the ice. So far, only one age is available for interstitial ice from permafrost-affected rockwall: the ice sampled from a felt block that is part of the deposit of the 150'000 m 3 rockfall that occurred in Feb. 2014 at Piz Kesch (Swiss Alps; |
author2 |
Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) Institut de gestion des entreprises -USJ (IGE) Université Saint-Joseph de Beyrouth (USJ) Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Ecole nationale de ski et d'alpinisme |
format |
Conference Object |
author |
Magnin, Florence Ravanel, Ludovic Guillet, Grégoire Montagnat, Maurine Preunkert, Susanne Duvillard, P.A Deline, Philip Pallandre, François |
author_facet |
Magnin, Florence Ravanel, Ludovic Guillet, Grégoire Montagnat, Maurine Preunkert, Susanne Duvillard, P.A Deline, Philip Pallandre, François |
author_sort |
Magnin, Florence |
title |
What can we learn from ice collected in high mountain rockfall scars? Three examples from the Mont Blanc massif (France) |
title_short |
What can we learn from ice collected in high mountain rockfall scars? Three examples from the Mont Blanc massif (France) |
title_full |
What can we learn from ice collected in high mountain rockfall scars? Three examples from the Mont Blanc massif (France) |
title_fullStr |
What can we learn from ice collected in high mountain rockfall scars? Three examples from the Mont Blanc massif (France) |
title_full_unstemmed |
What can we learn from ice collected in high mountain rockfall scars? Three examples from the Mont Blanc massif (France) |
title_sort |
what can we learn from ice collected in high mountain rockfall scars? three examples from the mont blanc massif (france) |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-02440776 https://hal.science/hal-02440776/document https://doi.org/10.1002/esp.3992 |
op_coverage |
Queenstown, New Zealand |
long_lat |
ENVELOPE(69.468,69.468,-49.461,-49.461) ENVELOPE(-37.083,-37.083,-54.167,-54.167) ENVELOPE(169.233,169.233,-72.433,-72.433) |
geographic |
Mont Blanc New Zealand The Trident Trident |
geographic_facet |
Mont Blanc New Zealand The Trident Trident |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
First Southern Hemisphere Conference on Permafrost - SouthCOP2019 https://hal.science/hal-02440776 First Southern Hemisphere Conference on Permafrost - SouthCOP2019, Dec 2019, Queenstown, New Zealand. 42, pp.426 - 438, 2016, ⟨10.1002/esp.3992⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/esp.3992 hal-02440776 https://hal.science/hal-02440776 https://hal.science/hal-02440776/document doi:10.1002/esp.3992 |
op_doi |
https://doi.org/10.1002/esp.3992 |
container_title |
Earth Surface Processes and Landforms |
container_volume |
42 |
container_issue |
3 |
container_start_page |
426 |
op_container_end_page |
438 |
_version_ |
1766026983812104192 |