Lateglacial rock slope failures in north‐west Ireland: age, causes and implications
ABSTRACT 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...
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crwiley:10.1002/jqs.2675 2024-06-02T08:08:03+00:00 Lateglacial rock slope failures in north‐west Ireland: age, causes and implications BALLANTYNE, COLIN K. WILSON, PETER SCHNABEL, CHRISTOPH XU, SHENG NERC Cosmogenic Isotope Analysis Facility 2013 http://dx.doi.org/10.1002/jqs.2675 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.2675 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.2675 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.2675 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 28, issue 8, page 789-802 ISSN 0267-8179 1099-1417 journal-article 2013 crwiley https://doi.org/10.1002/jqs.2675 2024-05-03T11:32:05Z ABSTRACT 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 Wiley Online Library Journal of Quaternary Science 28 8 789 802 |
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Wiley Online Library |
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English |
description |
ABSTRACT 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. |
author2 |
NERC Cosmogenic Isotope Analysis Facility |
format |
Article in Journal/Newspaper |
author |
BALLANTYNE, COLIN K. WILSON, PETER SCHNABEL, CHRISTOPH XU, SHENG |
spellingShingle |
BALLANTYNE, COLIN K. WILSON, PETER SCHNABEL, CHRISTOPH XU, SHENG Lateglacial rock slope failures in north‐west Ireland: age, causes and implications |
author_facet |
BALLANTYNE, COLIN K. WILSON, PETER SCHNABEL, CHRISTOPH XU, SHENG |
author_sort |
BALLANTYNE, COLIN K. |
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 |
publisher |
Wiley |
publishDate |
2013 |
url |
http://dx.doi.org/10.1002/jqs.2675 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.2675 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.2675 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.2675 |
genre |
Ice Ice Sheet permafrost |
genre_facet |
Ice Ice Sheet permafrost |
op_source |
Journal of Quaternary Science volume 28, issue 8, page 789-802 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
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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1800753208570675200 |