Interactions between rock avalanches and glaciers in the Mont Blanc massif during the late Holocene
International audience Rock avalanches are common in the Mont Blanc massif, which is bordered by valleys with large resident and tourist populations and important highways. This paper combines historical data with detailed geomorphological mapping, stratigraphic observation, and absolute and relativ...
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ftunigrenoble:oai:HAL:halsde-00358895v1 2024-05-12T08:05:05+00:00 Interactions between rock avalanches and glaciers in the Mont Blanc massif during the late Holocene Deline, Philip Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) 2009 https://hal.science/halsde-00358895 https://doi.org/10.1016/j.quascirev.2008.09.025 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2008.09.025 halsde-00358895 https://hal.science/halsde-00358895 doi:10.1016/j.quascirev.2008.09.025 ISSN: 0277-3791 EISSN: 1873-457X Quaternary Science Reviews https://hal.science/halsde-00358895 Quaternary Science Reviews, 2009, 28 (11-12), p.1070-1083. ⟨10.1016/j.quascirev.2008.09.025⟩ [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2009 ftunigrenoble https://doi.org/10.1016/j.quascirev.2008.09.025 2024-04-18T03:08:52Z International audience Rock avalanches are common in the Mont Blanc massif, which is bordered by valleys with large resident and tourist populations and important highways. This paper combines historical data with detailed geomorphological mapping, stratigraphic observation, and absolute and relative dating, to interpret several deposits resulting from rock avalanching onto glaciers. Nineteen rock falls and rock avalanches are described, ranging in volume from 10,000 m3 to 10 × 106 m3. They occurred between 2500 BP and AD 2007 at six sites. The events at three sites (Miage and Drus Glaciers, and Tour des Grandes Jorasses) are characterised by short travel distances; those at Brenva, Triolet, and Frébouge Glaciers exhibit excessive travel distances. Interactions between rock avalanches and glaciers are of four types: (i) rock-avalanche triggering, where glacial and paraglacial controls include debuttressing of rockwalls due to glacier thinning and retreat, oversteepening of rock slopes by glacial erosion, and effects of glaciers on permafrost; (ii) rock-avalanche mobility, in which mobility and travel distance are modified by channelling of rock-avalanche debris by moraines and valleys, incorporation of ice and snow (often >50% for large events), and irregularities on the glacier surface; (iii) deposit sedimentology, where melting of incorporated ice transforms the final deposit by reducing its thickness typically to <5 m, and debris of variable thicknesses is juxtaposed in a hummocky deposit with chaotic piles of angular rock debris; and (iv) glacier dynamics where insulating debris deposited upon a glacier produces a debris-covered glacier of different dynamics, and high elevated scars can favour the formation of small glaciers. Article in Journal/Newspaper Ice permafrost Université Grenoble Alpes: HAL Drus ENVELOPE(141.579,141.579,-66.769,-66.769) Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) Quaternary Science Reviews 28 11-12 1070 1083 |
institution |
Open Polar |
collection |
Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
topic |
[SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[SDE.MCG]Environmental Sciences/Global Changes Deline, Philip Interactions between rock avalanches and glaciers in the Mont Blanc massif during the late Holocene |
topic_facet |
[SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience Rock avalanches are common in the Mont Blanc massif, which is bordered by valleys with large resident and tourist populations and important highways. This paper combines historical data with detailed geomorphological mapping, stratigraphic observation, and absolute and relative dating, to interpret several deposits resulting from rock avalanching onto glaciers. Nineteen rock falls and rock avalanches are described, ranging in volume from 10,000 m3 to 10 × 106 m3. They occurred between 2500 BP and AD 2007 at six sites. The events at three sites (Miage and Drus Glaciers, and Tour des Grandes Jorasses) are characterised by short travel distances; those at Brenva, Triolet, and Frébouge Glaciers exhibit excessive travel distances. Interactions between rock avalanches and glaciers are of four types: (i) rock-avalanche triggering, where glacial and paraglacial controls include debuttressing of rockwalls due to glacier thinning and retreat, oversteepening of rock slopes by glacial erosion, and effects of glaciers on permafrost; (ii) rock-avalanche mobility, in which mobility and travel distance are modified by channelling of rock-avalanche debris by moraines and valleys, incorporation of ice and snow (often >50% for large events), and irregularities on the glacier surface; (iii) deposit sedimentology, where melting of incorporated ice transforms the final deposit by reducing its thickness typically to <5 m, and debris of variable thicknesses is juxtaposed in a hummocky deposit with chaotic piles of angular rock debris; and (iv) glacier dynamics where insulating debris deposited upon a glacier produces a debris-covered glacier of different dynamics, and high elevated scars can favour the formation of small glaciers. |
author2 |
Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Deline, Philip |
author_facet |
Deline, Philip |
author_sort |
Deline, Philip |
title |
Interactions between rock avalanches and glaciers in the Mont Blanc massif during the late Holocene |
title_short |
Interactions between rock avalanches and glaciers in the Mont Blanc massif during the late Holocene |
title_full |
Interactions between rock avalanches and glaciers in the Mont Blanc massif during the late Holocene |
title_fullStr |
Interactions between rock avalanches and glaciers in the Mont Blanc massif during the late Holocene |
title_full_unstemmed |
Interactions between rock avalanches and glaciers in the Mont Blanc massif during the late Holocene |
title_sort |
interactions between rock avalanches and glaciers in the mont blanc massif during the late holocene |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.science/halsde-00358895 https://doi.org/10.1016/j.quascirev.2008.09.025 |
long_lat |
ENVELOPE(141.579,141.579,-66.769,-66.769) ENVELOPE(69.468,69.468,-49.461,-49.461) |
geographic |
Drus Mont Blanc |
geographic_facet |
Drus Mont Blanc |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
ISSN: 0277-3791 EISSN: 1873-457X Quaternary Science Reviews https://hal.science/halsde-00358895 Quaternary Science Reviews, 2009, 28 (11-12), p.1070-1083. ⟨10.1016/j.quascirev.2008.09.025⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2008.09.025 halsde-00358895 https://hal.science/halsde-00358895 doi:10.1016/j.quascirev.2008.09.025 |
op_doi |
https://doi.org/10.1016/j.quascirev.2008.09.025 |
container_title |
Quaternary Science Reviews |
container_volume |
28 |
container_issue |
11-12 |
container_start_page |
1070 |
op_container_end_page |
1083 |
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1798847346914623488 |