Investigation of a cold-based ice apron on a high-mountain permafrost rock wall using ice texture analysis and micro- 14 C dating:a case study of the Triangle du Tacul ice apron (Mont Blanc massif, France)
The current paper studies the dynamics and age of the Triangle du Tacul (TDT) ice apron, a massive ice volume lying on a steep high-mountain rock wall in the French side of the Mont-Blanc massif at an altitude close to 3640 m a.s.l. Three 60 cm long ice cores were drilled to bedrock (i.e. the rock w...
Published in: | Journal of Glaciology |
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Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2021
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/investigation-of-a-coldbased-ice-apron-on-a-highmountain-permafrost-rock-wall-using-ice-texture-analysis-and-micro14c-dating(3599f32f-2f8c-40d9-bebf-89e46fdca235).html https://doi.org/10.1017/jog.2021.65 https://research-repository.st-andrews.ac.uk/bitstream/10023/23434/1/Guillet_2021_Glaciology_Investigation_cold_based_CC.pdf |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/3599f32f-2f8c-40d9-bebf-89e46fdca235 2023-05-15T16:37:12+02:00 Investigation of a cold-based ice apron on a high-mountain permafrost rock wall using ice texture analysis and micro- 14 C dating:a case study of the Triangle du Tacul ice apron (Mont Blanc massif, France) Guillet, Grégoire Preunkert, Susanne Ravanel, Ludovic Montagnat, Maurine Friedrich, Ronny 2021-06-10 application/pdf https://risweb.st-andrews.ac.uk/portal/en/researchoutput/investigation-of-a-coldbased-ice-apron-on-a-highmountain-permafrost-rock-wall-using-ice-texture-analysis-and-micro14c-dating(3599f32f-2f8c-40d9-bebf-89e46fdca235).html https://doi.org/10.1017/jog.2021.65 https://research-repository.st-andrews.ac.uk/bitstream/10023/23434/1/Guillet_2021_Glaciology_Investigation_cold_based_CC.pdf eng eng info:eu-repo/semantics/openAccess Guillet , G , Preunkert , S , Ravanel , L , Montagnat , M & Friedrich , R 2021 , ' Investigation of a cold-based ice apron on a high-mountain permafrost rock wall using ice texture analysis and micro- 14 C dating : a case study of the Triangle du Tacul ice apron (Mont Blanc massif, France) ' , Journal of Glaciology , vol. First View . https://doi.org/10.1017/jog.2021.65 Ice chronology/dating Ice core Ice crystal studies Mountain glaciers article 2021 ftunstandrewcris https://doi.org/10.1017/jog.2021.65 2022-06-02T07:53:11Z The current paper studies the dynamics and age of the Triangle du Tacul (TDT) ice apron, a massive ice volume lying on a steep high-mountain rock wall in the French side of the Mont-Blanc massif at an altitude close to 3640 m a.s.l. Three 60 cm long ice cores were drilled to bedrock (i.e. the rock wall) in 2018 and 2019 at the TDT ice apron. Texture (microstructure and lattice-preferred orientation, LPO) analyses were performed on one core. The two remaining cores were used for radiocarbon dating of the particulate organic carbon fraction (three samples in total). Microstructure and LPO do not substantially vary with along the axis of the ice core. Throughout the core, irregularly shaped grains, associated with strain-induced grain boundary migration and strong single maximum LPO, were observed. Measurements indicate that at the TDT ice deforms under a low strain-rate simple shear regime, with a shear plane parallel to the surface slope of the ice apron. Dynamic recrystallization stands out as the major mechanism for grain growth. Micro-radiocarbon dating indicates that the TDT ice becomes older with depth perpendicular to the ice surface. We observed ice ages older than 600 year BP and at the base of the lowest 30 cm older than 3000 years. Article in Journal/Newspaper Ice ice core Journal of Glaciology permafrost University of St Andrews: Research Portal Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) Journal of Glaciology 67 266 1205 1212 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Ice chronology/dating Ice core Ice crystal studies Mountain glaciers |
spellingShingle |
Ice chronology/dating Ice core Ice crystal studies Mountain glaciers Guillet, Grégoire Preunkert, Susanne Ravanel, Ludovic Montagnat, Maurine Friedrich, Ronny Investigation of a cold-based ice apron on a high-mountain permafrost rock wall using ice texture analysis and micro- 14 C dating:a case study of the Triangle du Tacul ice apron (Mont Blanc massif, France) |
topic_facet |
Ice chronology/dating Ice core Ice crystal studies Mountain glaciers |
description |
The current paper studies the dynamics and age of the Triangle du Tacul (TDT) ice apron, a massive ice volume lying on a steep high-mountain rock wall in the French side of the Mont-Blanc massif at an altitude close to 3640 m a.s.l. Three 60 cm long ice cores were drilled to bedrock (i.e. the rock wall) in 2018 and 2019 at the TDT ice apron. Texture (microstructure and lattice-preferred orientation, LPO) analyses were performed on one core. The two remaining cores were used for radiocarbon dating of the particulate organic carbon fraction (three samples in total). Microstructure and LPO do not substantially vary with along the axis of the ice core. Throughout the core, irregularly shaped grains, associated with strain-induced grain boundary migration and strong single maximum LPO, were observed. Measurements indicate that at the TDT ice deforms under a low strain-rate simple shear regime, with a shear plane parallel to the surface slope of the ice apron. Dynamic recrystallization stands out as the major mechanism for grain growth. Micro-radiocarbon dating indicates that the TDT ice becomes older with depth perpendicular to the ice surface. We observed ice ages older than 600 year BP and at the base of the lowest 30 cm older than 3000 years. |
format |
Article in Journal/Newspaper |
author |
Guillet, Grégoire Preunkert, Susanne Ravanel, Ludovic Montagnat, Maurine Friedrich, Ronny |
author_facet |
Guillet, Grégoire Preunkert, Susanne Ravanel, Ludovic Montagnat, Maurine Friedrich, Ronny |
author_sort |
Guillet, Grégoire |
title |
Investigation of a cold-based ice apron on a high-mountain permafrost rock wall using ice texture analysis and micro- 14 C dating:a case study of the Triangle du Tacul ice apron (Mont Blanc massif, France) |
title_short |
Investigation of a cold-based ice apron on a high-mountain permafrost rock wall using ice texture analysis and micro- 14 C dating:a case study of the Triangle du Tacul ice apron (Mont Blanc massif, France) |
title_full |
Investigation of a cold-based ice apron on a high-mountain permafrost rock wall using ice texture analysis and micro- 14 C dating:a case study of the Triangle du Tacul ice apron (Mont Blanc massif, France) |
title_fullStr |
Investigation of a cold-based ice apron on a high-mountain permafrost rock wall using ice texture analysis and micro- 14 C dating:a case study of the Triangle du Tacul ice apron (Mont Blanc massif, France) |
title_full_unstemmed |
Investigation of a cold-based ice apron on a high-mountain permafrost rock wall using ice texture analysis and micro- 14 C dating:a case study of the Triangle du Tacul ice apron (Mont Blanc massif, France) |
title_sort |
investigation of a cold-based ice apron on a high-mountain permafrost rock wall using ice texture analysis and micro- 14 c dating:a case study of the triangle du tacul ice apron (mont blanc massif, france) |
publishDate |
2021 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/investigation-of-a-coldbased-ice-apron-on-a-highmountain-permafrost-rock-wall-using-ice-texture-analysis-and-micro14c-dating(3599f32f-2f8c-40d9-bebf-89e46fdca235).html https://doi.org/10.1017/jog.2021.65 https://research-repository.st-andrews.ac.uk/bitstream/10023/23434/1/Guillet_2021_Glaciology_Investigation_cold_based_CC.pdf |
long_lat |
ENVELOPE(69.468,69.468,-49.461,-49.461) |
geographic |
Mont Blanc |
geographic_facet |
Mont Blanc |
genre |
Ice ice core Journal of Glaciology permafrost |
genre_facet |
Ice ice core Journal of Glaciology permafrost |
op_source |
Guillet , G , Preunkert , S , Ravanel , L , Montagnat , M & Friedrich , R 2021 , ' Investigation of a cold-based ice apron on a high-mountain permafrost rock wall using ice texture analysis and micro- 14 C dating : a case study of the Triangle du Tacul ice apron (Mont Blanc massif, France) ' , Journal of Glaciology , vol. First View . https://doi.org/10.1017/jog.2021.65 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1017/jog.2021.65 |
container_title |
Journal of Glaciology |
container_volume |
67 |
container_issue |
266 |
container_start_page |
1205 |
op_container_end_page |
1212 |
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1766027495981711360 |