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Maximum extent and dynamic behaviour of the last British–Irish Ice Sheet west of Ireland

Peters, J.L.; Benetti, S.; Dunlop, P.; Ó Cofaigh, C.

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Authors

J.L. Peters

S. Benetti

P. Dunlop



Abstract

A complete reconstruction of the last British–Irish Ice Sheet (BIIS) is hindered by uncertainty surrounding its offshore extent and dynamic behaviour. This study addresses this problem by reconstructing the depositional history of four sediment cores taken from a series of sinuous glacigenic sediment ridges on the continental shelf west of Ireland. We present new geomorphic, sedimentary and micropaleontological data that record a maximum westward BIIS extent that was at least 80 km farther offshore from any previous estimates. The data suggests that a large ice shelf formed over parts of the shelf prior to retreat. This new data increases the areal extent of grounded BIIS ice by ∼6700 km2 from previous estimates, which represents a ∼3% increase in the Irish Sector of the ice sheet. Three new AMS radiocarbon dates demonstrate for the first time that the BIIS advanced to the shelf edge during last glaciation (Late Midlandian/Late Devensian), with ice advance onto the Porcupine Bank occurring after 24,720 ± 260 yr Cal. BP. Deglaciation was complete by 19,182 ± 155 yr Cal. BP, thus constraining BIIS occupation over the Porcupine Bank to less than 5500 years. Estimated retreat rates of marine-terminating ice across the shelf range from ∼70 to 180 myr−1.

Citation

Peters, J., Benetti, S., Dunlop, P., & Ó Cofaigh, C. (2015). Maximum extent and dynamic behaviour of the last British–Irish Ice Sheet west of Ireland. Quaternary Science Reviews, 128, 48-68. https://doi.org/10.1016/j.quascirev.2015.09.015

Journal Article Type Article
Acceptance Date Sep 14, 2015
Publication Date Nov 15, 2015
Deposit Date Oct 16, 2015
Publicly Available Date Mar 29, 2024
Journal Quaternary Science Reviews
Print ISSN 0277-3791
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 128
Pages 48-68
DOI https://doi.org/10.1016/j.quascirev.2015.09.015
Keywords British–Irish Ice Sheet, Marine-terminating ice margin, Maximum extent, Porcupine Bank, Continental shelf, Ice shelf, Radiocarbon, Sedimentology, Benthic foraminifera, Geomorphology.

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