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Deglaciation chronology of the Donegal Ice Centre, north-west Ireland

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Date
11/01/2019
Author
Wilson, Peter
Ballantyne, Colin K.
Benetti, Sara
Small, David
Fabel, Derek
Clark, Chris D.
Keywords
British–Irish Ice Sheet
Deglaciation
North-west Ireland
Terrestrial cosmogenic nuclide surface exposure dating
G Geography (General)
NDAS
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Abstract
During the Last Glacial Maximum, Donegal in north‐west Ireland functioned as an independent centre of ice dispersal that separated and fed into the Donegal Bay Ice Lobe (sourced in the Irish Midlands) to the south and the Hebrides/Malin Sea Ice Stream to the north. We report geochronological data that demonstrate marked contrasts in the timing and rate of deglaciation in northern and southern Donegal. In northern Donegal, which occupied an inter‐ice‐stream/lobe location, decoupling from the Hebrides/Malin Sea Ice Stream resulted in formation of a marine embayment along the north coast by ∼22–21 ka, and subsequent slow (∼4 ± 1 m a−1) climatically driven inland retreat of the ice margin to mountain source areas by ∼17 ka. By contrast, in southern Donegal, which lay near the axis of the Donegal Bay Ice Lobe, deglaciation was delayed until ∼18 ka following readvance of ice to a moraine in outer Donegal Bay. The ice margin subsequently underwent net retreat, apparently uninterrupted by readvances, at a net rate of ∼ 18 ± 6 m a−1. A mean terrestrial cosmogenic nuclide age of ∼15.0 ka obtained for samples from the foothills of the Blue Stack Mountains in south‐east Donegal indicates that ice persisted in valley heads and cirques at the beginning of the Lateglacial Interstadial, suggesting that these and nearby mountains supported the last remnants of the Irish Ice Sheet before complete deglaciation of Ireland, and that almost all the shrinkage of the ice sheet in this sector occurred under stadial conditions before the onset of interstadial warming at ∼14.7 ka.
Citation
Wilson , P , Ballantyne , C K , Benetti , S , Small , D , Fabel , D & Clark , C D 2019 , ' Deglaciation chronology of the Donegal Ice Centre, north-west Ireland ' , Journal of Quaternary Science , vol. 34 , no. 1 , pp. 16-28 . https://doi.org/10.1002/jqs.3077
Publication
Journal of Quaternary Science
Status
Peer reviewed
DOI
https://doi.org/10.1002/jqs.3077
ISSN
0267-8179
Type
Journal article
Rights
Copyright © 2018 The Authors. Journal of Quaternary Science Published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Description
This work was supported by the UK Natural Environment Research Council consortium grant: BRITICE‐CHRONO NE/J009768/1. The TCN analyses were undertaken at the NERC Cosmogenic Isotope Analysis Facility (allocation 9155/1014).
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/16866

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