Rapid thinning of the Welsh Ice Cap at 20–19 ka Based on 10Be Ages

dc.contributor.authorHughes, PDen_AU
dc.contributor.authorGlasser, NFen_AU
dc.contributor.authorFink, Den_AU
dc.date.accessioned2021-12-20T23:57:55Zen_AU
dc.date.available2021-12-20T23:57:55Zen_AU
dc.date.issued2017-01-20en_AU
dc.date.statistics2021-11-14en_AU
dc.description.abstractNew 10Be ages from the summits of three mountain areas of North Wales reveal a very similar exposure timing as the Welsh Ice Cap thinned after the global Last Glacial Maximum. Eight bedrock and one boulder sample gave a combined arithmetic mean exposure age of 19.08 ± 0.80 ka (4.2%, 1σ). Similar exposure ages over a 320 m vertical range (824 to 581 m altitude) show that ice cap thinning was very rapid and spatially uniform. Using the same production rate and scaling scheme, we recalculated six published 10Be exposure ages from the nearby Arans, which also covered a similar elevation range from 608 to 901 m and obtained an arithmetic mean of 19.41 ± 1.45 ka (7.5%, 1σ). The average exposure age of all 15 accepted deglaciation ages is 19.21 ± 1.07 (5.6%, 1σ). The complete dataset from North Wales provides very strong evidence indicating that these summits became exposed as nunataks at 20–19 ka. This result provides important insight to the magnitude of ice surface lowering and behavior of the Welsh Ice Cap during the last deglaciation that can be compared to other ice masses that made up the British-Irish Ice Sheet. © University of Washingtonen_AU
dc.identifier.citationHughes, P., Glasser, N., & Fink, D. (2017). Rapid thinning of the Welsh Ice Cap at 20–19 ka Based on 10Be Ages. Quaternary Research, 85(1), 107-117. doi:10.1016/j.yqres.2015.11.003en_AU
dc.identifier.issn1096-0287en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleQuaternary Researchen_AU
dc.identifier.pagination107-117en_AU
dc.identifier.urihttps://doi.org/10.1016/j.yqres.2015.11.003en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12600en_AU
dc.identifier.volume85en_AU
dc.language.isoenen_AU
dc.publisherCambridge University Pressen_AU
dc.subjectIceen_AU
dc.subjectGlaciersen_AU
dc.subjectUnited Kingdomen_AU
dc.subjectBeryllium 10en_AU
dc.subjectAge estimationen_AU
dc.subjectMountainsen_AU
dc.titleRapid thinning of the Welsh Ice Cap at 20–19 ka Based on 10Be Agesen_AU
dc.typeJournal Articleen_AU
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