Glacially moulded landslide runout debris in the Scottish Highlands
A tongue of hummocky terrain ∼1 km long and ∼400 m wide extends downslope from the source area of a rock-slope failure that formed the summit arête of Sgùrr nan Ceathreamhnan in the NW Highlands. The tongue descends from ∼810 m to ∼650 m, crosses a corrie obliquely and laps onto an opposing slope. I...
Published in: | Scottish Geographical Journal |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2018
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/glacially-moulded-landslide-runout-debris-in-the-scottish-highlands(c7f3747e-6089-481e-8e88-a25e2f0ad1ad).html https://doi.org/10.1080/14702541.2018.1501085 https://research-repository.st-andrews.ac.uk/bitstream/10023/18130/1/Ballantyne_2018_SGJ_Glaciallymoulded_AAM.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/c7f3747e-6089-481e-8e88-a25e2f0ad1ad 2024-09-15T18:12:28+00:00 Glacially moulded landslide runout debris in the Scottish Highlands Ballantyne, Colin K. 2018 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/glacially-moulded-landslide-runout-debris-in-the-scottish-highlands(c7f3747e-6089-481e-8e88-a25e2f0ad1ad).html https://doi.org/10.1080/14702541.2018.1501085 https://research-repository.st-andrews.ac.uk/bitstream/10023/18130/1/Ballantyne_2018_SGJ_Glaciallymoulded_AAM.pdf eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/glacially-moulded-landslide-runout-debris-in-the-scottish-highlands(c7f3747e-6089-481e-8e88-a25e2f0ad1ad).html info:eu-repo/semantics/openAccess Ballantyne , C K 2018 , ' Glacially moulded landslide runout debris in the Scottish Highlands ' , Scottish Geographical Journal , vol. 134 , no. 3-4 , pp. 224–236 . https://doi.org/10.1080/14702541.2018.1501085 Glacial bedforms Hummocks Lateglacial Loch Lomond Stade Rock avalanche Rock-slope failure article 2018 ftunstandrewcris https://doi.org/10.1080/14702541.2018.1501085 2024-07-31T23:33:09Z A tongue of hummocky terrain ∼1 km long and ∼400 m wide extends downslope from the source area of a rock-slope failure that formed the summit arête of Sgùrr nan Ceathreamhnan in the NW Highlands. The tongue descends from ∼810 m to ∼650 m, crosses a corrie obliquely and laps onto an opposing slope. Individual hummocks are circular to elongate, up to 6 m high and streamlined. A possible origin as recessional or ice-stagnation moraines is inconsistent with hummock morphology and the alignment of the hummock belt, and the streamlining of the hummocks is incompatible with the form of unmodified rock-avalanche runout hummocks. It is proposed that the tongue of hummocky terrain represents rock-slope failure during or after ice-sheet deglaciation, and subsequent modification of runout debris by subglacial erosion during the Loch Lomond Stade (∼12.9–11.7 ka). This interpretation implies (i) that the debris was deposited by an excess-runout rock avalanche; (ii) that the glacier that subsequently occupied the corrie was warm-based; (iii) that Lateglacial landslide runout debris was not invariably evacuated by Loch Lomond Stadial glaciers, as previously suggested; and (iv) that some features interpreted as hummocky moraines elsewhere may have a similar origin. Article in Journal/Newspaper Ice Sheet University of St Andrews: Research Portal Scottish Geographical Journal 134 3-4 224 236 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Glacial bedforms Hummocks Lateglacial Loch Lomond Stade Rock avalanche Rock-slope failure |
spellingShingle |
Glacial bedforms Hummocks Lateglacial Loch Lomond Stade Rock avalanche Rock-slope failure Ballantyne, Colin K. Glacially moulded landslide runout debris in the Scottish Highlands |
topic_facet |
Glacial bedforms Hummocks Lateglacial Loch Lomond Stade Rock avalanche Rock-slope failure |
description |
A tongue of hummocky terrain ∼1 km long and ∼400 m wide extends downslope from the source area of a rock-slope failure that formed the summit arête of Sgùrr nan Ceathreamhnan in the NW Highlands. The tongue descends from ∼810 m to ∼650 m, crosses a corrie obliquely and laps onto an opposing slope. Individual hummocks are circular to elongate, up to 6 m high and streamlined. A possible origin as recessional or ice-stagnation moraines is inconsistent with hummock morphology and the alignment of the hummock belt, and the streamlining of the hummocks is incompatible with the form of unmodified rock-avalanche runout hummocks. It is proposed that the tongue of hummocky terrain represents rock-slope failure during or after ice-sheet deglaciation, and subsequent modification of runout debris by subglacial erosion during the Loch Lomond Stade (∼12.9–11.7 ka). This interpretation implies (i) that the debris was deposited by an excess-runout rock avalanche; (ii) that the glacier that subsequently occupied the corrie was warm-based; (iii) that Lateglacial landslide runout debris was not invariably evacuated by Loch Lomond Stadial glaciers, as previously suggested; and (iv) that some features interpreted as hummocky moraines elsewhere may have a similar origin. |
format |
Article in Journal/Newspaper |
author |
Ballantyne, Colin K. |
author_facet |
Ballantyne, Colin K. |
author_sort |
Ballantyne, Colin K. |
title |
Glacially moulded landslide runout debris in the Scottish Highlands |
title_short |
Glacially moulded landslide runout debris in the Scottish Highlands |
title_full |
Glacially moulded landslide runout debris in the Scottish Highlands |
title_fullStr |
Glacially moulded landslide runout debris in the Scottish Highlands |
title_full_unstemmed |
Glacially moulded landslide runout debris in the Scottish Highlands |
title_sort |
glacially moulded landslide runout debris in the scottish highlands |
publishDate |
2018 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/glacially-moulded-landslide-runout-debris-in-the-scottish-highlands(c7f3747e-6089-481e-8e88-a25e2f0ad1ad).html https://doi.org/10.1080/14702541.2018.1501085 https://research-repository.st-andrews.ac.uk/bitstream/10023/18130/1/Ballantyne_2018_SGJ_Glaciallymoulded_AAM.pdf |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Ballantyne , C K 2018 , ' Glacially moulded landslide runout debris in the Scottish Highlands ' , Scottish Geographical Journal , vol. 134 , no. 3-4 , pp. 224–236 . https://doi.org/10.1080/14702541.2018.1501085 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/glacially-moulded-landslide-runout-debris-in-the-scottish-highlands(c7f3747e-6089-481e-8e88-a25e2f0ad1ad).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1080/14702541.2018.1501085 |
container_title |
Scottish Geographical Journal |
container_volume |
134 |
container_issue |
3-4 |
container_start_page |
224 |
op_container_end_page |
236 |
_version_ |
1810450044490350592 |