10Be and 26Al exposure-age dating of bedrock surfaces on the Aran Ridge, Wales: Evidence for a thick Welsh Ice Cap at the LGM

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10Be and 26Al exposure-age dating of bedrock surfaces on the Aran Ridge, Wales: Evidence for a thick Welsh Ice Cap at the LGM. / Glasser, Neil Franklin; Hughes, Philip D.; Fenton, Cassandra R.; Schnabel, Christoph; Rother, Henrik.

In: Journal of Quaternary Science, Vol. 27, No. 1, 01.2012, p. 97–104.

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Harvard

Glasser, NF, Hughes, PD, Fenton, CR, Schnabel, C & Rother, H 2012, '10Be and 26Al exposure-age dating of bedrock surfaces on the Aran Ridge, Wales: Evidence for a thick Welsh Ice Cap at the LGM', Journal of Quaternary Science, vol. 27, no. 1, pp. 97–104. https://doi.org/10.1002/jqs.1519

APA

Glasser, N. F., Hughes, P. D., Fenton, C. R., Schnabel, C., & Rother, H. (2012). 10Be and 26Al exposure-age dating of bedrock surfaces on the Aran Ridge, Wales: Evidence for a thick Welsh Ice Cap at the LGM. Journal of Quaternary Science, 27(1), 97–104. https://doi.org/10.1002/jqs.1519

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Glasser, Neil Franklin ; Hughes, Philip D. ; Fenton, Cassandra R. ; Schnabel, Christoph ; Rother, Henrik. / 10Be and 26Al exposure-age dating of bedrock surfaces on the Aran Ridge, Wales: Evidence for a thick Welsh Ice Cap at the LGM. In: Journal of Quaternary Science. 2012 ; Vol. 27, No. 1. pp. 97–104.

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@article{349614506ffd4140bc7b2b1efd56d6e2,
title = "10Be and 26Al exposure-age dating of bedrock surfaces on the Aran Ridge, Wales: Evidence for a thick Welsh Ice Cap at the LGM",
abstract = "This paper presents results of the analysis of paired cosmogenic isotopes (10Be and 26Al) from eight quartz-rich samples collected from ice-moulded bedrock on the Aran ridge, the highest land in the British Isles south of Snowdon. On the Aran ridge, comprising the summits of Aran Fawddwy (905 m a.s.l.) and Aran Benllyn (885 m a.s.l.), 26Al and 10Be ages indicate complete ice coverage and glacial erosion at the global Last Glacial Maximum (LGM). Six samples from the summit ridge above 750–800 m a.s.l. yielded paired 10Be and 26Al ages ranging from 17.2 to 34.4 ka, respectively. Four of these samples are very close in age (10Be ages of 17.5 ± 0.6, 17.5 ± 0.7, 19.7 ± 0.8 and 20.0 ± 0.7 ka) and are interpreted as representing the exposure age of the summit ridge. Two other summit samples are much older (10Be ages of 27.5 ± 1.0 and 33.9 ± 1.2 ka) and these results may indicate nuclide inheritance. The 26Al/10Be ratios for all samples are indistinguishable within one-sigma uncertainty from the production rate ratio line, indicating that there is no evidence for a complex exposure history. These results indicate that the last Welsh Ice Cap was thick enough to completely cover the Aran ridge and achieve glacial erosion at the LGM. However, between c. 20 and 17 ka ridge summits were exposed as nunataks at a time when glacial erosion at lower elevations (below 750–800 m a.s.l.) was achieved by large outlet glaciers in the valleys surrounding the mountains. Copyright {\textcopyright} 2011 John Wiley & Sons, Ltd.",
author = "Glasser, {Neil Franklin} and Hughes, {Philip D.} and Fenton, {Cassandra R.} and Christoph Schnabel and Henrik Rother",
year = "2012",
month = jan,
doi = "10.1002/jqs.1519",
language = "English",
volume = "27",
pages = "97–104",
journal = "Journal of Quaternary Science",
issn = "0267-8179",
publisher = "Wiley",
number = "1",

}

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TY - JOUR

T1 - 10Be and 26Al exposure-age dating of bedrock surfaces on the Aran Ridge, Wales: Evidence for a thick Welsh Ice Cap at the LGM

AU - Glasser, Neil Franklin

AU - Hughes, Philip D.

AU - Fenton, Cassandra R.

AU - Schnabel, Christoph

AU - Rother, Henrik

PY - 2012/1

Y1 - 2012/1

N2 - This paper presents results of the analysis of paired cosmogenic isotopes (10Be and 26Al) from eight quartz-rich samples collected from ice-moulded bedrock on the Aran ridge, the highest land in the British Isles south of Snowdon. On the Aran ridge, comprising the summits of Aran Fawddwy (905 m a.s.l.) and Aran Benllyn (885 m a.s.l.), 26Al and 10Be ages indicate complete ice coverage and glacial erosion at the global Last Glacial Maximum (LGM). Six samples from the summit ridge above 750–800 m a.s.l. yielded paired 10Be and 26Al ages ranging from 17.2 to 34.4 ka, respectively. Four of these samples are very close in age (10Be ages of 17.5 ± 0.6, 17.5 ± 0.7, 19.7 ± 0.8 and 20.0 ± 0.7 ka) and are interpreted as representing the exposure age of the summit ridge. Two other summit samples are much older (10Be ages of 27.5 ± 1.0 and 33.9 ± 1.2 ka) and these results may indicate nuclide inheritance. The 26Al/10Be ratios for all samples are indistinguishable within one-sigma uncertainty from the production rate ratio line, indicating that there is no evidence for a complex exposure history. These results indicate that the last Welsh Ice Cap was thick enough to completely cover the Aran ridge and achieve glacial erosion at the LGM. However, between c. 20 and 17 ka ridge summits were exposed as nunataks at a time when glacial erosion at lower elevations (below 750–800 m a.s.l.) was achieved by large outlet glaciers in the valleys surrounding the mountains. Copyright © 2011 John Wiley & Sons, Ltd.

AB - This paper presents results of the analysis of paired cosmogenic isotopes (10Be and 26Al) from eight quartz-rich samples collected from ice-moulded bedrock on the Aran ridge, the highest land in the British Isles south of Snowdon. On the Aran ridge, comprising the summits of Aran Fawddwy (905 m a.s.l.) and Aran Benllyn (885 m a.s.l.), 26Al and 10Be ages indicate complete ice coverage and glacial erosion at the global Last Glacial Maximum (LGM). Six samples from the summit ridge above 750–800 m a.s.l. yielded paired 10Be and 26Al ages ranging from 17.2 to 34.4 ka, respectively. Four of these samples are very close in age (10Be ages of 17.5 ± 0.6, 17.5 ± 0.7, 19.7 ± 0.8 and 20.0 ± 0.7 ka) and are interpreted as representing the exposure age of the summit ridge. Two other summit samples are much older (10Be ages of 27.5 ± 1.0 and 33.9 ± 1.2 ka) and these results may indicate nuclide inheritance. The 26Al/10Be ratios for all samples are indistinguishable within one-sigma uncertainty from the production rate ratio line, indicating that there is no evidence for a complex exposure history. These results indicate that the last Welsh Ice Cap was thick enough to completely cover the Aran ridge and achieve glacial erosion at the LGM. However, between c. 20 and 17 ka ridge summits were exposed as nunataks at a time when glacial erosion at lower elevations (below 750–800 m a.s.l.) was achieved by large outlet glaciers in the valleys surrounding the mountains. Copyright © 2011 John Wiley & Sons, Ltd.

UR - http://hdl.handle.net/2160/8656

U2 - 10.1002/jqs.1519

DO - 10.1002/jqs.1519

M3 - Article

VL - 27

SP - 97

EP - 104

JO - Journal of Quaternary Science

JF - Journal of Quaternary Science

SN - 0267-8179

IS - 1

ER -

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