The evolution of the terrestrial-terminating Irish Sea glacier during the last glaciation
dc.contributor.author | Chiverrell, RC | |
dc.contributor.author | Thomas, GSP | |
dc.contributor.author | Burke, M | |
dc.contributor.author | Medialdea, A | |
dc.contributor.author | Smedley, R | |
dc.contributor.author | Bateman, M | |
dc.contributor.author | Clark, C | |
dc.contributor.author | Duller, GAT | |
dc.contributor.author | Fabel, D | |
dc.contributor.author | Jenkins, G | |
dc.contributor.author | Ou, X | |
dc.contributor.author | Roberts, HM | |
dc.contributor.author | Scourse, J | |
dc.date.accessioned | 2020-07-29T13:12:50Z | |
dc.date.issued | 2020-06-07 | |
dc.description.abstract | Here we reconstruct the last advance to maximum limits and retreat of the Irish Sea Glacier (ISG), the only land-terminating ice lobe of the western British Irish Ice Sheet. A series of reverse bedrock slopes rendered proglacial lakes endemic, forming time-transgressive moraine- and bedrock-dammed basins that evolved with ice marginal retreat. Combining, for the first time on glacial sediments, optically stimulated luminescence (OSL) bleaching profiles for cobbles with single grain and small aliquot OSL measurements on sands, has produced a coherent chronology from these heterogeneously bleached samples. This chronology constrains what is globally an early build-up of ice during late Marine Isotope Stage 3 and Greenland Stadial (GS) 5, with ice margins reaching south Lancashire by 30 ± 1.2 ka, followed by a 120-km advance at 28.3 ± 1.4 ka reaching its 26.5 ± 1.1 ka maximum extent during GS-3. Early retreat during GS-3 reflects piracy of ice sources shared with the Irish-Sea Ice Stream (ISIS), starving the ISG. With ISG retreat, an opportunistic readvance of Welsh ice during GS-2 rode over the ISG moraines occupying the space vacated, with ice margins oscillating within a substantial glacial over-deepening. Our geomorphological chronosequence shows a glacial system forced by climate but mediated by piracy of ice sources shared with the ISIS, changing flow regimes and fronting environments. | en_GB |
dc.description.sponsorship | Natural Environment Research Council (NERC) | en_GB |
dc.identifier.citation | First published online 7 July 2020 | en_GB |
dc.identifier.doi | 10.1002/jqs.3229 | |
dc.identifier.grantnumber | NE/J009768/1 | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/122218 | |
dc.language.iso | en | en_GB |
dc.publisher | Wiley | en_GB |
dc.rights | © 2020 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. | en_GB |
dc.subject | British–Irish ice sheet | en_GB |
dc.subject | deglaciation | en_GB |
dc.subject | geomorphology | en_GB |
dc.subject | glacial lakes | en_GB |
dc.subject | luminescence dating | en_GB |
dc.title | The evolution of the terrestrial-terminating Irish Sea glacier during the last glaciation | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2020-07-29T13:12:50Z | |
dc.identifier.issn | 0267-8179 | |
dc.description | This is the final version. Available from Wiley via the DOI in this record. | en_GB |
dc.identifier.eissn | 1099-1417 | |
dc.identifier.journal | Journal of Quaternary Science | en_GB |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | en_GB |
dcterms.dateAccepted | 2020-06-13 | |
exeter.funder | ::Natural Environment Research Council (NERC) | en_GB |
rioxxterms.version | VoR | en_GB |
rioxxterms.licenseref.startdate | 2020-06-13 | |
rioxxterms.type | Journal Article/Review | en_GB |
refterms.dateFCD | 2020-07-29T13:09:21Z | |
refterms.versionFCD | VoR | |
refterms.dateFOA | 2020-07-29T13:12:56Z | |
refterms.panel | C | en_GB |
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Except where otherwise noted, this item's licence is described as © 2020 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.