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Title: Exploring controls of the early and stepped deglaciation on the western margin of the British Irish Ice Sheet
Authors: Benetti, Sara ‎
Chiverrell, Richard ‎
Ó Cofaigh, Colm
Burke, Matthew J.
Medialdea, Alicia
Small, David
Ballantyne, Colin K.
Bateman, Mark D.
Callard, Louise
Wilson, Peter
Fabel, Derek
Clark, Chris D.
Arosio, Riccardo
Bradley, Sarah
Dunlop, Paul
Ely, Jeremy
Gales, Jenny
Livingstone, Stephen J.
Moreton, Steven
Purcell, Catriona
Saher, Margot
Schiele, Kevin
Van Landeghem, Katrien
Weilbach, Kasper
Issue Date: Jul-2021
Publisher: Wiley
Citation: Journal of Quaternary Science, 2021, 36 (5), 833-870
Abstract: 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 ~27 ka, before the global Last Glacial Maximum, and shelf-wide retreat began 26–26.5 ka at a rate of ~18.7–20.7 m a–1. MSIS grounding zone wedges and DBIS recessional moraines show episodic retreat punctuated by prolonged still-stands. By ~23–22 ka the outer shelf (~25 000 km2) was free of grounded ice. After this time, MSIS retreat was faster (~20 m a–1 vs. ~2–6 m a–1 of DBIS). Separation of Irish and Scottish ice sources occurred ~20–19.5 ka, leaving an autonomous Donegal ice dome. Inner Malin shelf deglaciation followed the submarine troughs reaching the Hebridean coast ~19 ka. DBIS retreat formed the extensive complex of moraines in outer Donegal Bay at 20.5–19 ka. DBIS retreated on land by ~17–16 ka. Isolated ice caps in Scotland and Ireland persisted until ~14.5 ka. Early retreat of this marine-terminating margin 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 mid-shelf to the coast.
ISSN: 0267-8179
DOI: 10.1002/jqs.3315
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Type: Article
Appears in Collections:Geocronología y Geología

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