Investigation of a cold-based ice apron on a high-mountain permafrost rock wall using ice texture analysis and micro-14C dating : a case study of the Triangle du Tacul ice apron (Mont Blanc massif, France)
This study is part of the ANR 14-CE03-0006 VIP Mont Blanc and the EU ALCOTRA AdaPT Mont Blanc project. 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...
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Online Access: | http://hdl.handle.net/10023/23434 https://doi.org/10.1017/jog.2021.65 |
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/23434 2023-07-02T03:32:33+02:00 Investigation of a cold-based ice apron on a high-mountain permafrost rock wall using ice texture analysis and micro-14C 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 University of St Andrews. School of Geography & Sustainable Development 2021-06-28T20:30:14Z 8 application/pdf http://hdl.handle.net/10023/23434 https://doi.org/10.1017/jog.2021.65 eng eng Journal of Glaciology 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 0022-1430 PURE: 274843634 PURE UUID: 3599f32f-2f8c-40d9-bebf-89e46fdca235 RIS: urn:4493D84319021D3FD55B67318B46C05D Scopus: 85107861135 WOS: 000721347700019 http://hdl.handle.net/10023/23434 https://doi.org/10.1017/jog.2021.65 Copyright © The Author(s), 2021. Published by Cambridge University Press. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. Ice chronology/dating Ice core Ice crystal studies Mountain glaciers GB Physical geography DAS GB Journal article 2021 ftstandrewserep https://doi.org/10.1017/jog.2021.65 2023-06-13T18:28:34Z This study is part of the ANR 14-CE03-0006 VIP Mont Blanc and the EU ALCOTRA AdaPT Mont Blanc project. 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. Publisher PDF Peer reviewed Article in Journal/Newspaper Ice ice core Journal of Glaciology permafrost University of St Andrews: Digital Research Repository Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) Journal of Glaciology 1 8 |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
Ice chronology/dating Ice core Ice crystal studies Mountain glaciers GB Physical geography DAS GB |
spellingShingle |
Ice chronology/dating Ice core Ice crystal studies Mountain glaciers GB Physical geography DAS GB 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-14C 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 GB Physical geography DAS GB |
description |
This study is part of the ANR 14-CE03-0006 VIP Mont Blanc and the EU ALCOTRA AdaPT Mont Blanc project. 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. Publisher PDF Peer reviewed |
author2 |
University of St Andrews. School of Geography & Sustainable Development |
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-14C 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-14C 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-14C 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-14C 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-14C 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-14c dating : a case study of the triangle du tacul ice apron (mont blanc massif, france) |
publishDate |
2021 |
url |
http://hdl.handle.net/10023/23434 https://doi.org/10.1017/jog.2021.65 |
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_relation |
Journal of Glaciology 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 0022-1430 PURE: 274843634 PURE UUID: 3599f32f-2f8c-40d9-bebf-89e46fdca235 RIS: urn:4493D84319021D3FD55B67318B46C05D Scopus: 85107861135 WOS: 000721347700019 http://hdl.handle.net/10023/23434 https://doi.org/10.1017/jog.2021.65 |
op_rights |
Copyright © The Author(s), 2021. Published by Cambridge University Press. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. |
op_doi |
https://doi.org/10.1017/jog.2021.65 |
container_title |
Journal of Glaciology |
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