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)
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...
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Cambridge University Press
2021
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ftdoajarticles:oai:doaj.org/article:84dd7118721c49bd88a060480cf17209 2023-05-15T16:37:14+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) Grégoire Guillet Susanne Preunkert Ludovic Ravanel Maurine Montagnat Ronny Friedrich 2021-12-01T00:00:00Z https://doi.org/10.1017/jog.2021.65 https://doaj.org/article/84dd7118721c49bd88a060480cf17209 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143021000654/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2021.65 0022-1430 1727-5652 https://doaj.org/article/84dd7118721c49bd88a060480cf17209 Journal of Glaciology, Vol 67, Pp 1205-1212 (2021) Ice chronology/dating ice core ice crystal studies mountain glaciers Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2021 ftdoajarticles https://doi.org/10.1017/jog.2021.65 2023-03-12T01:30:57Z 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 Directory of Open Access Journals: DOAJ Articles Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) Journal of Glaciology 67 266 1205 1212 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ice chronology/dating ice core ice crystal studies mountain glaciers Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Ice chronology/dating ice core ice crystal studies mountain glaciers Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Grégoire Guillet Susanne Preunkert Ludovic Ravanel Maurine Montagnat Ronny Friedrich 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 Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
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 |
Grégoire Guillet Susanne Preunkert Ludovic Ravanel Maurine Montagnat Ronny Friedrich |
author_facet |
Grégoire Guillet Susanne Preunkert Ludovic Ravanel Maurine Montagnat Ronny Friedrich |
author_sort |
Grégoire Guillet |
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) |
publisher |
Cambridge University Press |
publishDate |
2021 |
url |
https://doi.org/10.1017/jog.2021.65 https://doaj.org/article/84dd7118721c49bd88a060480cf17209 |
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 |
Journal of Glaciology, Vol 67, Pp 1205-1212 (2021) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143021000654/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2021.65 0022-1430 1727-5652 https://doaj.org/article/84dd7118721c49bd88a060480cf17209 |
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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1766027528707768320 |