Maximum extent and readvance dynamics of the Irish Sea Ice Stream and Irish Sea Glacier since the Last Glacial Maximum

James D Scourse, Richard Chiverrell, R K Smedley, David Small, M J Burke, Margot Saher, Katrien J. J. Van Landeghem, Geoff A. T. Duller, C Ó Cofaigh, MD Bateman, S. Benetti, Sarah Bradley, Louise Callard, D J A Evans, Derek Fabel, G T H Jenkins, S. McCarron, Alicia Medialdea, Steve Moreton, X OuDaniel Praeg, D H Roberts, H M Roberts, C.D. Clark

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
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Abstract

The BRITICE‐CHRONO Project has generated a suite of recently published radiocarbon ages from deglacial sequences offshore in the Celtic and Irish seas and terrestrial cosmogenic nuclide and optically stimulated luminescence ages from adjacent onshore sites. All published data are integrated here with new geochronological data from Wales in a revised Bayesian analysis that enables reconstruction of ice retreat dynamics across the basin. Patterns and changes in the pace of deglaciation are conditioned more by topographic constraints and internal ice dynamics than by external controls. The data indicate a major but rapid and very short‐lived extensive thin ice advance of the Irish Sea Ice Stream (ISIS) more than 300 km south of St George's Channel to a marine calving margin at the shelf break at 25.5 ka; this may have been preceded by extensive ice accumulation plugging the constriction of St George's Channel. The release event between 25 and 26 ka is interpreted to have stimulated fast ice streaming and diverted ice to the west in the northern Irish Sea into the main axis of the marine ISIS away from terrestrial ice terminating in the English Midlands, a process initiating ice stagnation and the formation of an extensive dead ice landscape in the Midlands.
Original languageEnglish
Pages (from-to)780-804
Number of pages25
JournalJournal of Quaternary Science
Volume36
Issue number5
Early online date7 May 2021
DOIs
Publication statusPublished online - 7 May 2021

Bibliographical note

Funding Information:
This research was supported by a Natural Environment Research Council consortium grant (BRITICE-CHRONO NE/J008672/1). Thanks are due to Sally Morgan and Elke Hanenkamp (University of Leicester) for acquisition and processing of multi-sensor core-logger data. The work was supported by the NERC Radiocarbon Facility (allocations 1530.0311, 1577.0911 and 1606.0312) and the NERC Cosmogenic Isotope Analysis Facility. We thank the staff at the SUERC AMS Laboratory, East Kilbride, for carbon isotope measurements, and the master and crew of the RRS James Cook, the BGS Marine Operations Team (vibrocorer) and the NOC/NMEP (piston corer). Daniel Praeg's participation has been in part supported by the Italian PNRA project IPY GLAMAR (grant no. 2009/A2.15). We thank two anonymous reviewers for their helpful and constructive comments.

Funding Information:
This research was supported by a Natural Environment Research Council consortium grant (BRITICE‐CHRONO NE/J008672/1). Thanks are due to Sally Morgan and Elke Hanenkamp (University of Leicester) for acquisition and processing of multi‐sensor core‐logger data. The work was supported by the NERC Radiocarbon Facility (allocations 1530.0311, 1577.0911 and 1606.0312) and the NERC Cosmogenic Isotope Analysis Facility. We thank the staff at the SUERC AMS Laboratory, East Kilbride, for carbon isotope measurements, and the master and crew of the RRS , the BGS Marine Operations Team (vibrocorer) and the NOC/NMEP (piston corer). Daniel Praeg's participation has been in part supported by the Italian PNRA project IPY GLAMAR (grant no. 2009/A2.15). We thank two anonymous reviewers for their helpful and constructive comments. James Cook

Publisher Copyright:
© 2021 The Authors Journal of Quaternary Science Published by John Wiley & Sons Ltd.

Keywords

  • deglaciation
  • geochronology
  • geomorphology
  • ice stream
  • marine geology
  • Arts and Humanities (miscellaneous)
  • Earth and Planetary Sciences (miscellaneous)
  • Palaeontology

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