Marine geophysical evidence for ice sheet extension and recession on the Malin Shelf: New evidence for the western limits of the British Irish Ice Sheet

Dunlop, P; Shannon, Rachel; McCabe, Michelle; Quinn, Rory; Doyle, Eibhlin

doi:10.1016/j.margeo.2010.07.010

Cited by 80 publications

(88 citation statements)

References 36 publications

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“…A number of ridges are present running mainly W-E along the northern edge of the Porcupine Bank. Their sharp-crested, arcuate morphology, scale and acoustic signature would draw comparisons with the subglacial ridges identified elsewhere on the Irish Shelf (Benetti, Dunlop, & Ó Cofaigh, 2010;Dunlop, Shannon, McCabe, Quinn, & Doyle, 2010;. However, further work is needed to test this hypothesis.…”

Section: Discussionmentioning

confidence: 94%

Seabed geomorphology of the Porcupine Bank, West of Ireland

et al. 2015

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A new map of the seabed geomorphology on the Porcupine Bank, located at the western edge of the north-eastern Atlantic shelf west of Ireland, uses high-resolution multibeam bathymetric and backscatter data as well as numerous shallow seismic profiles to identify individual landforms. They are described based on their acoustic signature on the various datasets. The landforms comprise sharp-crested ridges, mounds and outcrops often associated with and expressing underlying bedrock topography; sand waves highlighting modern currents directions; and iceberg scours with strongly preferred orientations. The map is intended as baseline evidence to test models of the palaeoceanographic and palaeoglaciological history of the Porcupine Bank.ARTICLE HISTORY

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Section: Discussionmentioning

confidence: 94%

Seabed geomorphology of the Porcupine Bank, West of Ireland

et al. 2015

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“…Moraines are sedimentary ridges orientated parallel to the former ice-sheet edge and mark the maximum ice-sheet extent or successive positions of the ice-sheet margin during deglaciation [4,57]. Impressive examples of these features have recently been imaged from the seas around Ireland and Britain where they have been used to reconstruct the maximum extent of past glaciation and the form and pattern of subsequent ice-sheet retreat [42,[58][59][60]. For example, offshore of northwest Ireland multi-beam swath bathymetric data during regional deglaciation (figure 5) [58,61].…”

Section: (B) Reconstruction Of Past Ice Sheets On High-and Mid-latitumentioning

confidence: 99%

“…Impressive examples of these features have recently been imaged from the seas around Ireland and Britain where they have been used to reconstruct the maximum extent of past glaciation and the form and pattern of subsequent ice-sheet retreat [42,[58][59][60]. For example, offshore of northwest Ireland multi-beam swath bathymetric data during regional deglaciation (figure 5) [58,61]. The pattern of the moraines implies that the BIIS underwent major reorganization during shelf deglaciation from a 'line-source'-type margin that extended along the shelf edge to a more lobate form [42,61].…”

Section: (B) Reconstruction Of Past Ice Sheets On High-and Mid-latitumentioning

confidence: 99%

Ice sheets viewed from the ocean: the contribution of marine science to understanding modern and past ice sheets

Cofaigh

2012

Phil. Trans. R. Soc. A.

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Over the last two decades, marine science, aided by technological advances in sediment coring, geophysical imaging and remotely operated submersibles, has played a major role in the investigation of contemporary and former ice sheets. Notable advances have been achieved with respect to reconstructing the extent and flow dynamics of the large polar ice sheets and their mid-latitude counterparts during the Quaternary from marine geophysical and geological records of landforms and sediments on glacierinfluenced continental margins. Investigations of the deep-sea ice-rafted debris record have demonstrated that catastrophic collapse of large (10 5 -10 6 km 2 ) ice-sheet drainage basins occurred on millennial and shorter time scales and had a major influence on oceanography. In the last few years, increasing emphasis has been placed on understanding physical processes at the ice-ocean interface, particularly at the grounding line, and on determining how these processes affect ice-sheet stability. This remains a major challenge, however, owing to the logistical constraints imposed by working in ice-infested polar waters and ice-shelf cavities. Furthermore, despite advances in reconstructing the Quaternary history of mid-and high-latitude ice sheets, major unanswered questions remain regarding West Antarctic ice-sheet stability, and the longterm offshore history of the East Antarctic and Greenland ice sheets remains poorly constrained. While these are major research frontiers in glaciology, and ones in which marine science has a pivotal role to play, realizing such future advances will require an integrated collaborative approach between oceanographers, glaciologists, marine geologists and numerical modellers.

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“…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%

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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Marine geophysical evidence for ice sheet extension and recession on the Malin Shelf: New evidence for the western limits of the British Irish Ice Sheet

Cited by 80 publications

References 36 publications

Seabed geomorphology of the Porcupine Bank, West of Ireland

Seabed geomorphology of the Porcupine Bank, West of Ireland

Ice sheets viewed from the ocean: the contribution of marine science to understanding modern and past ice sheets

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

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