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Ice margin oscillations during deglaciation of the northern Irish Sea Basin.

Chiverrell, R. C. and Smedley, R. K. and Small, D. and Ballantyne, C. K. and Burke, M. J. and Callard, S. L. and Clark, C. D. and Duller, G. A. T. and Evans, D. J. A. and Fabel, D. and van Landeghem, K. and Livingstone, S. and Ó Cofaigh, C. and Thomas, G. S. P. and Roberts, D. H. and Saher, M. and Scourse, J. D. and Wilson, P. (2018) 'Ice margin oscillations during deglaciation of the northern Irish Sea Basin.', Journal of quaternary science., 33 (7). pp. 739-762.

Abstract

We present a new chronology to constrain ice‐margin retreat in the northern Irish Sea Basin. Estimates on the timing of ice thinning derived from surface exposure ages for boulders from the summits of the Isle of Man and south‐west Cumbria suggest that ice thinning was commensurate with the rapid retreat that followed the short‐lived advance of the Irish Sea Ice Stream (ISIS) to maximum limits in the Celtic Sea. This ice retreat in the northern Irish Sea Basin was fastest at 20 ka in response to a wider calving margin, but slowed as ice stabilized and oscillated against the Isle of Man. We provide the first age constraints for the Scottish Readvance (19.2–18.2 ka) and demonstrate that it was a potentially regional event across the Isle of Man and Cumbrian lowlands not linked with Heinrich Event 1. After the Scottish Readvance, the ice front retreated northwards towards the Southern Uplands of Scotland at the same time as climate north of ∼45°N warmed in response to summer insolation. This sequence demonstrates the importance of internal dynamics in controlling ice retreat rates in the Irish Sea, but also that deglaciation of the northern Irish Sea Basin was a response to climate warming.

Item Type:Article
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Full text:(VoR) Version of Record
Available under License - Creative Commons Attribution.
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(13905Kb)
Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1002/jqs.3057
Publisher statement:© 2018 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in anymedium, provided the original work is properly cited.
Date accepted:21 June 2018
Date deposited:15 August 2018
Date of first online publication:31 July 2018
Date first made open access:No date available

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