Pattern and timing of retreat of the last British-Irish Ice Sheet

Clark, Chris D.; Hughes, Anna L.C.; Greenwood, Sarah L.; Jordan, Colm; Sejrup, Hans Petter

doi:10.1016/j.quascirev.2010.07.019

Cited by 452 publications

(697 citation statements)

References 127 publications

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“…Whilst the timing and lateral extent of the modelled BIIS is broadly similar to more recent reconstructions (e.g. Clark et al, 2012), the reinterpretation of trimline data as englacial transitions between warm-and cold-based ice (i.e. minimum ice sheet thickness) opens up the possibility for increased loading terms in future modelling studies (e.g.…”

supporting

confidence: 65%

“…Two 36 Cl dates from low elevation sites near Kenmare and on the Sheep's Head Peninsula with reported ages of 22.0±3.4 and 21.3±1.3 ka BP, suggest early deglaciation of low ground in this area (Bowen et al, 2002). However, possible inheritance issues with cosmogenic dating means that this is a minimum age for deglaciation, whilst other reconstructions suggest that the local ice-cap was still present at 19 ka BP (Clark et al, 2012).…”

Section: Geological Oceanographic and Quaternary Settingmentioning

confidence: 95%

“…Firstly, despite improved understanding of the dimensions of the western portion of the BIIS (e.g., Ó Cofaigh et al, 2012b;Dunlop et al, 2010;Clark et al, 2012), there is still uncertainty about the extent, thickness and history of the ice-sheet. Secondly, there are large gaps in the RSL data around Ireland.…”

Section: Introductionmentioning

confidence: 99%

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Late Quaternary evolution and sea-level history of a glaciated marine embayment, Bantry Bay, SW Ireland

et al. 2015

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'Late Quaternary evolution and sea-level history of a glaciated marine embayment, Bantry Bay, SW Ireland.', Marine geology., 369 . pp. 251-272. Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractIreland experienced a spatially complex pattern of relative sea-level (RSL) changes and shoreline development caused by the interplay of isostatic and eustatic (ice equivalent sea level) processes since the Last Glacial Maximum (LGM). Using a combination of high-resolution marine geophysical data, vibrocores, foraminiferal analysis and 10 AMS radiocarbon dates, we reconstruct the Late Quaternary evolution and RSL history of Bantry Bay, a large (40 km long, 5-10 km wide) embayment in SW Ireland.The data indicate two infill phases: one before and one after the LGM, separated by glacial and lowstand sediments. The pre-LGM history is not dated and the depositional history is inferred. A large sediment lobe formed at the outer edge of Bantry Bay as a lowstand ice-proximal glacimarine outwash system as the ice retreated after the LGM, at a sea level ca. 80 m lower than present.Iceberg scour immediately west of this location likely relate to the break-up of the local Kerry-Cork Ice Cap. Long curvilinear ridges, seen both offshore and on top of the sediment lobe, probably formed as shoreface ridges under stronger-than-present tidal currents during a period of RSL stability (pre-14.6 ka cal BP). A subsequent infill phase is characterised by a basin-wide erosional (ravinement) surface and the deposition of inter-and sub-tidal estuarine sediments. Although our data support the general trends, our stratigraphic and radiocarbon data suggest a higher sea level between 11 and 13.5 ka cal BP than predicted by existing glacial isostatic adjustment models.

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supporting

confidence: 65%

Section: Geological Oceanographic and Quaternary Settingmentioning

confidence: 95%

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Late Quaternary evolution and sea-level history of a glaciated marine embayment, Bantry Bay, SW Ireland

et al. 2015

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“…18). These key differences in ice-sheet retreat geometry, 19 rate and style, between previously published work (Clark et al, 2012) and our new study, may be 20 vitally important when seeking to chronologically constrain and refine the pattern of British-Irish Ice 21…”

Section: Ice Sheet Retreat Pattern and Evolution 28mentioning

confidence: 68%

Asymmetric ice-sheet retreat pattern around northern Scotland revealed by marine geophysical surveys

Bradwell

Stoker

2014

Earth and Environmental Science Transactions of the Royal Socie

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This study uses marine geophysical data, principally single-beam and high-resolution multibeam echo sounder bathymetry, combined with seismic sub-bottom profiles, and existing Quaternary geological information, to map the glacial geomorphology of a large area of seafloor (∼50,000 km2) on the continental shelf around northern Scotland, from west of Lewis to north of the Orkney Islands. Our new mapping reveals the detailed pattern of submarine glacial landforms, predominantly moraines, relating to ice sheets that covered Scotland and much of the continental shelf during the Late Weichselian glaciation and earlier in the Mid to Late Pleistocene. The reconstructed retreat pattern based on geomorphological evidence highlights the large number of different retreat stages and the asymmetric, non-uniform evolution of this ice sheet sector during Late Weichselian deglaciation. Time-equivalent ice-front reconstructions show that marine sectors of the ice sheet, such as the Minch, changed their geometry significantly, perhaps rapidly; whilst other sectors remained relatively unchanged and stable. We suggest that this behaviour, governed principally by bed topography/bathymetry and ice dynamics, led to reorganisation of the Late Weichselian ice sheet as it retreated back to two main ice centres: one in Western Scotland and the other over Orkney and Shetland. This retreat pattern suggests relatively early deglaciation of NW Lewis (ca. 25 ka BP) and the mountains of far NW Scotland – the latter possibly forming a substantial ice-free land corridor. Our reconstructions differ from most previous syntheses, but are strongly supported by the independently-mapped offshore Quaternary succession and key onshore dating constraints.

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“…A key conclusion was that different sectors of the BIIS reached their maximum positions at different times, and that the initiation of ice streaming and calving may have been an important factor in explaining the retreat of marine-based sectors. Clark et al (2012) compared their reconstruction with numerical modelling of the ice sheet (Boulton and Hagdorn, 2006;Hubbard et al, 2009) and found that, whilst there were broad similarities in terms of the extent and the position of ice divides, there were marked discrepancies in the timing of maximum extent and retreat phases, which they suggested may be due to the palaeo-climate forcing, interpreted from the Greenland ice core record. They highlighted the need for further data-model integration, and 8 an improved understanding of both calving dynamics and the links between interior thinning and marginal retreat.…”

mentioning

confidence: 99%

On the reconstruction of palaeo-ice sheets: Recent advances and future challenges

Stokes

Tarasov

Blomdin

et al. 2015

Quaternary Science Reviews

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104

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Pattern and timing of retreat of the last British-Irish Ice Sheet

Cited by 452 publications

References 127 publications

Late Quaternary evolution and sea-level history of a glaciated marine embayment, Bantry Bay, SW Ireland

Late Quaternary evolution and sea-level history of a glaciated marine embayment, Bantry Bay, SW Ireland

Asymmetric ice-sheet retreat pattern around northern Scotland revealed by marine geophysical surveys

On the reconstruction of palaeo-ice sheets: Recent advances and future challenges

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