Lateglacial rock slope failures in north-west Ireland:age, causes and implications
Nine postglacial quartzite rock slope failures (RSFs) in north-west Ireland were dated using cosmogenic 10 Be. Weighted mean RSF ages range from 17.7 ± 0.9 to 12.5 ± 0.7 ka or 16.6 ± 0.7 to 11.7 ± 0.5 ka, depending on assumed 10 Be production rate. All dated RSFs occurred within ∼5000 years followin...
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/6cefb792-2aec-41eb-9ade-ea9e0ebe3af5 2023-05-15T16:37:49+02:00 Lateglacial rock slope failures in north-west Ireland:age, causes and implications Ballantyne, Colin Wilson, Peter Schnabel, Christoph Xu, Sheng 2013-11 application/pdf https://risweb.st-andrews.ac.uk/portal/en/researchoutput/lateglacial-rock-slope-failures-in-northwest-ireland(6cefb792-2aec-41eb-9ade-ea9e0ebe3af5).html https://doi.org/10.1002/jqs.2675 https://research-repository.st-andrews.ac.uk/bitstream/10023/5840/1/Ballantyne_2013_JQS_Lateglacial.pdf eng eng info:eu-repo/semantics/openAccess Ballantyne , C , Wilson , P , Schnabel , C & Xu , S 2013 , ' Lateglacial rock slope failures in north-west Ireland : age, causes and implications ' , Journal of Quaternary Science , vol. 28 , no. 8 , pp. 789-802 . https://doi.org/10.1002/jqs.2675 10Be exposure dating palaeoseismicity paraglacial rock slope failure stress release article 2013 ftunstandrewcris https://doi.org/10.1002/jqs.2675 2022-06-02T07:42:10Z Nine postglacial quartzite rock slope failures (RSFs) in north-west Ireland were dated using cosmogenic 10 Be. Weighted mean RSF ages range from 17.7 ± 0.9 to 12.5 ± 0.7 ka or 16.6 ± 0.7 to 11.7 ± 0.5 ka, depending on assumed 10 Be production rate. All dated RSFs occurred within ∼5000 years following ice-sheet deglaciation at ∼17.4ka (∼16.3 ka) and all but two occurred within 2000 years after deglaciation. The timing of RSFs rules out glacial ‘debuttressing’, permafrost degradation and enhanced deglacial cleft-water pressures as triggers of failure in most cases. We infer that paraglacial stress release and associated fracture propagation were critical in reducing rock masses to critical stability, although earthquakes caused by Lateglacial glacio-isostatic rebound and/or release of stored tectonic stresses may have triggered failure in some or all cases. In conjunction with data from related studies, our results imply that most undated RSFs outside the limit of Younger Dryas glaciation in the British Isles are of Lateglacial age, and that numerous Lateglacial RSFs occurred inside these limits, with subsequent removal of debris by glaciers. They support the view that paraglacial RSF activity in tectonically stable intraplate terrains was concentrated within a few millennia following deglaciation. Article in Journal/Newspaper Ice Ice Sheet permafrost University of St Andrews: Research Portal Journal of Quaternary Science 28 8 789 802 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
10Be exposure dating palaeoseismicity paraglacial rock slope failure stress release |
spellingShingle |
10Be exposure dating palaeoseismicity paraglacial rock slope failure stress release Ballantyne, Colin Wilson, Peter Schnabel, Christoph Xu, Sheng Lateglacial rock slope failures in north-west Ireland:age, causes and implications |
topic_facet |
10Be exposure dating palaeoseismicity paraglacial rock slope failure stress release |
description |
Nine postglacial quartzite rock slope failures (RSFs) in north-west Ireland were dated using cosmogenic 10 Be. Weighted mean RSF ages range from 17.7 ± 0.9 to 12.5 ± 0.7 ka or 16.6 ± 0.7 to 11.7 ± 0.5 ka, depending on assumed 10 Be production rate. All dated RSFs occurred within ∼5000 years following ice-sheet deglaciation at ∼17.4ka (∼16.3 ka) and all but two occurred within 2000 years after deglaciation. The timing of RSFs rules out glacial ‘debuttressing’, permafrost degradation and enhanced deglacial cleft-water pressures as triggers of failure in most cases. We infer that paraglacial stress release and associated fracture propagation were critical in reducing rock masses to critical stability, although earthquakes caused by Lateglacial glacio-isostatic rebound and/or release of stored tectonic stresses may have triggered failure in some or all cases. In conjunction with data from related studies, our results imply that most undated RSFs outside the limit of Younger Dryas glaciation in the British Isles are of Lateglacial age, and that numerous Lateglacial RSFs occurred inside these limits, with subsequent removal of debris by glaciers. They support the view that paraglacial RSF activity in tectonically stable intraplate terrains was concentrated within a few millennia following deglaciation. |
format |
Article in Journal/Newspaper |
author |
Ballantyne, Colin Wilson, Peter Schnabel, Christoph Xu, Sheng |
author_facet |
Ballantyne, Colin Wilson, Peter Schnabel, Christoph Xu, Sheng |
author_sort |
Ballantyne, Colin |
title |
Lateglacial rock slope failures in north-west Ireland:age, causes and implications |
title_short |
Lateglacial rock slope failures in north-west Ireland:age, causes and implications |
title_full |
Lateglacial rock slope failures in north-west Ireland:age, causes and implications |
title_fullStr |
Lateglacial rock slope failures in north-west Ireland:age, causes and implications |
title_full_unstemmed |
Lateglacial rock slope failures in north-west Ireland:age, causes and implications |
title_sort |
lateglacial rock slope failures in north-west ireland:age, causes and implications |
publishDate |
2013 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/lateglacial-rock-slope-failures-in-northwest-ireland(6cefb792-2aec-41eb-9ade-ea9e0ebe3af5).html https://doi.org/10.1002/jqs.2675 https://research-repository.st-andrews.ac.uk/bitstream/10023/5840/1/Ballantyne_2013_JQS_Lateglacial.pdf |
genre |
Ice Ice Sheet permafrost |
genre_facet |
Ice Ice Sheet permafrost |
op_source |
Ballantyne , C , Wilson , P , Schnabel , C & Xu , S 2013 , ' Lateglacial rock slope failures in north-west Ireland : age, causes and implications ' , Journal of Quaternary Science , vol. 28 , no. 8 , pp. 789-802 . https://doi.org/10.1002/jqs.2675 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/jqs.2675 |
container_title |
Journal of Quaternary Science |
container_volume |
28 |
container_issue |
8 |
container_start_page |
789 |
op_container_end_page |
802 |
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1766028110402158592 |