Rapid thinning of the Welsh Ice Cap at 20–19 ka based on 10Be ages

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Rapid thinning of the Welsh Ice Cap at 20–19 ka based on 10Be ages. / Hughes, Philip D.; Glasser, Neil; Fink, David.

In: Quaternary Research, Vol. 85, No. 1, 20.01.2016, p. 107-117.

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Hughes, Philip D. ; Glasser, Neil ; Fink, David. / Rapid thinning of the Welsh Ice Cap at 20–19 ka based on 10Be ages. In: Quaternary Research. 2016 ; Vol. 85, No. 1. pp. 107-117.

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@article{834645f0125e4204bdee3097c7088507,
title = "Rapid thinning of the Welsh Ice Cap at 20–19 ka based on 10Be ages",
abstract = "New 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.",
keywords = "Welsh Ice Cap, Nunatak, 10Be, comogenic exposure dating, Rhinogs, Moelwyns, Arenigs, deglaciation",
author = "Hughes, {Philip D.} and Neil Glasser and David Fink",
note = "This is the author accepted manuscript. The final version is available from Elsevier via http://dx.doi.org/doi:10.1016/j.yqres.2015.11.003",
year = "2016",
month = jan,
day = "20",
doi = "10.1016/j.yqres.2015.11.003",
language = "English",
volume = "85",
pages = "107--117",
journal = "Quaternary Research",
issn = "0033-5894",
publisher = "Elsevier",
number = "1",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Rapid thinning of the Welsh Ice Cap at 20–19 ka based on 10Be ages

AU - Hughes, Philip D.

AU - Glasser, Neil

AU - Fink, David

N1 - This is the author accepted manuscript. The final version is available from Elsevier via http://dx.doi.org/doi:10.1016/j.yqres.2015.11.003

PY - 2016/1/20

Y1 - 2016/1/20

N2 - New 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.

AB - New 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.

KW - Welsh Ice Cap

KW - Nunatak

KW - 10Be

KW - comogenic exposure dating

KW - Rhinogs

KW - Moelwyns

KW - Arenigs

KW - deglaciation

UR - http://hdl.handle.net/2160/41959

U2 - 10.1016/j.yqres.2015.11.003

DO - 10.1016/j.yqres.2015.11.003

M3 - Article

VL - 85

SP - 107

EP - 117

JO - Quaternary Research

JF - Quaternary Research

SN - 0033-5894

IS - 1

ER -

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