Late Pleistocene chronostratigraphy and ice sheet limits, southern Ireland

Cofaigh, Colm Ó; Telfer, Matt W.; Bailey, Richard M.; Evans, David J. A.

doi:10.1016/j.quascirev.2010.01.011

Cited by 61 publications

(108 citation statements)

References 67 publications

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“…This compares with evidence from deep-sea cores on the Celtic margin for increases in ice-rafted debris (IRD) of IrishCeltic Sea provenance, with a smaller peak at c. 25.5e24.5 ka BP and a main peak at 23.6e23.4 ka BP encompassing Heinrich Event 2 (HE2; Scourse et al, 2001Scourse et al, , 2009aAuffret et al, 2002). These peaks are consistent with evidence from southern Ireland and the Isles of Scilly for the advance and retreat of the Irish Sea Ice Stream (ISIS) around 25e23 ka ( O Cofaigh and Evans, 2007;O Cofaigh et al, 2012;McCarroll et al 2010;see Chiverrell and Thomas, 2010;Chiverrell et al, 2013). Greenland ice cores record a northward migration of the polar front during this period, suggesting the IRD peaks could correspond to ISIS advance under cold conditions before 24.5 ka BP, followed by retreat under warmer conditions (Scourse et al, 2009a).…”

Section: Implications For Biis Advance and Retreatsupporting

confidence: 70%

“…The southernmost extent of the last BritisheIrish Ice Sheet (BIIS) has long been disputed (e.g. Mitchell et al, 1973;Scourse, 1991;Scourse and Furze, 2001;Bowen et al, 2002), but it is now agreed that onshore glacigenic deposits in Ireland and southern Britain provide evidence of an advance of the Irish Sea Ice Stream into the Celtic Sea during the Last Glacial Maximum (LGM), around 25e23 ka BP 1 (Scourse, 1991;Evans, 2001, 2007;Greenwood and Clark, 2009;Chiverrell and Thomas, 2010;Clark et al, 2010;McCarroll et al, 2010;O Cofaigh et al, 2012;Chiverrell et al, 2013). The extent of this advance across the continental shelf has been constrained by a dozen vibrocores acquired in the late 1970s that penetrated surficial sand and gravel to reach sediments of glacial character ( Fig.…”

Section: Introductionmentioning

confidence: 99%

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Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum

Praeg

McCarron

Dove

et al. 2015

Quaternary Science Reviews

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a b s t r a c tPrevious reconstructions of the BritisheIrish Ice Sheet (BIIS) envisage ice streaming from the Irish Sea to the Celtic Sea at the Last Glacial Maximum, to a limit on the mid-shelf of the Irish-UK sectors. We present evidence from sediment cores and geophysical profiles that the BIIS extended 150 km farther seaward to reach the continental shelf edge. Three cores recently acquired from the flank of outer Cockburn Bank, a shelf-crossing sediment ridge, terminated in an eroded glacigenic layer including two facies: overconsolidated stratified diamicts; and finely-bedded muddy sand containing micro-and macrofossil species of cold water affinities. We interpret these facies to result from subglacial deformation and glacimarine deposition from turbid meltwater plumes. A date of 24,265 ± 195 cal BP on a chipped but unabraded mollusc valve in the glacimarine sediments indicates withdrawal of a tidewater ice sheet margin from the shelf edge by this time, consistent with evidence from deep-sea cores for ice-rafted debris peaks of Celtic Sea provenance between 25.5 and 23.4 ka BP. Together with terrestrial evidence, this supports rapid (ca 2 ka) purging of the BIIS by an ice stream that advanced from the Irish Sea to the shelf edge and collapsed back during Heinrich event 2.

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Section: Implications For Biis Advance and Retreatsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum

Praeg

McCarron

Dove

et al. 2015

Quaternary Science Reviews

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“…Recent studies demonstrate that during build-up to the LGM, ice reached the southern part of Ireland after 24 ka BP (the 'Irish Sea Till') (Ó Cofaigh et al, 2012a), with an ice stream that extended as far as the Scilly Isles (Hiemstra et al, 2006;Scourse et al, 2009a;McCarroll et al, 2010) (Figure 2a). Southwest Ireland remained under the influence of a local ice cap, the Kerry-Cork Ice Cap, centred on the Kenmare Valley, immediately north of Bantry Bay (Ballantyne et al, 2011) (Figure 2a).…”

Section: Geological Oceanographic and Quaternary Settingmentioning

confidence: 99%

“…The lateral extent of the Kerry-Cork Ice Cap is marked by an outermost eastern moraine (Kilcummin and Killumney moraines) interpreted variously as the LGM limit, a post-LGM readvance (for discussion see Ballantyne et al (2011)), or a recessional feature formed during the last deglaciation (Ó Cofaigh et al, 2012a). The offshore extent of the Kerry-Cork Ice Cap during the LGM is speculative.…”

Section: Geological Oceanographic and Quaternary Settingmentioning

confidence: 99%

“…As the overlying Unit IV has been interpreted as a possible till (see below), Unit VI pre-dates a glacial phase. Pre-LGM deposits have occasionally survived glaciation in Ireland; for example, in West Cork, and along large stretches of the south coast of Ireland, a raised beach dated to MIS 4-3 (76 -24 ka BP) is thought to have been deposited during a period of glacio-isostatic depression, combined with a high eustatic sea-level (Ó Cofaigh et al, 2012a). Alternatively, sediments assigned to the Gortian interglacial stage have been cored from Cork Harbour; the exact age of this stage is, however, still unresolved and could relate to either MIS 7, 9 or 11 (Dowling and Coxon, 2001).…”

Section: Overall Stratigraphymentioning

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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2017

Till: A Glacial Process Sedimentology

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Late Pleistocene chronostratigraphy and ice sheet limits, southern Ireland

Cited by 61 publications

References 67 publications

Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum

Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum

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

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