Exploring controls of the early and stepped deglaciation on the western margin of the British Irish Ice Sheet.

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Dangosydd eitem ddigidol (DOI)

  • Sara Benetti
    Ulster University
  • Richard C. Chiverrell
    Department of Molecular and Clinical Pharmacology, University of Liverpool
  • Colm Ó Cofaigh
    Durham University
  • Matthew Burke
    Department of Molecular and Clinical Pharmacology, University of Liverpool
  • Alicia Medialdea
    University of Cologne
  • David Small
    Durham University
  • Colin Ballantyne
    University of St. Andrews
  • Mark Bateman
    University of Sheffield
  • Sarah Louise Callard
    Institute for Health and Society, Newcastle University, Newcastle upon Tyne, UK.
  • Peter Wilson
    Ulster University
  • Derek Fabel
    Scottish Universities Environmental Research Centre
  • Chris Clark
    Sheffield University
  • Riccardo Arosio
    Scottish Association for Marine Science
  • Sarah L. Bradley
    University of Sheffield
  • Paul Dunlop
    Ulster University
  • Jeremy C. Ely
    University of Sheffield
  • Jenny Gales
    University of Plymouth
  • Stephen J. Livingstone
    University of Sheffield
  • Steven Moreton
    NERC Radiocarbon Facility, East Kilbride
  • Catriona Purcell
  • Margot Saher
  • Kevin Schiele
    Ulster University
  • Katrien Van Landeghem
  • Kasper Weilbach
    Durham University
New optically-stimulated luminescence dating and Bayesian models integrating all legacy and BRITICE-CHRONO geochronology facilitated exploration of the controls on the deglaciation of two former sectors of the British-Irish Ice Sheet, the Donegal Bay (DBIS) and Malin Sea ice-streams (MSIS). Shelf-edge glaciation occurred ~27ka, prior to the global Last Glacial Maximum, and shelf-wide retreat began 26-26.5ka at a rate of ~18.7- 20.7m/a. MSIS grounding zone wedges and DBIS recessional moraines show episodic retreat punctuated by prolonged still-stands. By ~23-22ka the outer shelf (~25,000 km2) was free of grounded ice. After this time, MSIS retreat was faster (~20m/a vs. ~2-6m/a of DBIS). Separation of Irish and Scottish ice sources occurred ~20-19.5ka, leaving an autonomous Donegal ice dome. Inner Malin shelf deglaciation followed the submarine troughs reaching the Hebridean coast ~19ka. DBIS retreat formed the extensive complex of moraines in outer Donegal Bay at 20.5-19ka. DBIS retreated on land by ~17-16ka. Isolated ice caps in Scotland and Ireland persisted until ~14.5ka. Early retreat of this marine terminating margin margins is best explained by local ice loading increasing water depths and promoting calving ice losses rather than by changes in global temperatures. Topographical controls governed the differences between the ice-stream retreat from midshelf to the coast.

Allweddeiriau

Iaith wreiddiolSaesneg
Tudalennau (o-i)833-870
CyfnodolynJournal of Quaternary Science
Cyfrol36
Rhif y cyfnodolyn5
Dyddiad ar-lein cynnar2 Meh 2021
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - Gorff 2021

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