Deglaciation of a major palaeo-ice stream in Disko Trough, West Greenland

Hogan, Kelly; Cofaigh, Colm Ó; Jennings, Anne E.; Dowdeswell, Julian A.; Hiemstra, John F.

doi:10.1016/j.quascirev.2016.01.018

Cited by 71 publications

(93 citation statements)

References 77 publications

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“…are diagnostic features for the presence of former ice sheets and extensively used to reconstruct ice sheet dynamics (Polyak et al, 1997;Anderson et al, 2002;Winsborrow, et al, 2010;Jakobsson et al, 2012a;Kirshner et al, 2012;Hogan et al, 2010Hogan et al, , 2016. Their association with fast-streaming ice is supported by the common presence of mega-scale glacial lineations (MSGL) within them (Clark, 1993;Stokes and Clark, 2002;Ó Cofaigh et al, 2002;Ottesen et al, 2005;King et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

The De Long Trough: a newly discovered glacial trough on the East Siberian continental margin

et al. 2017

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Abstract. Ice sheets extending over parts of the East Siberian continental shelf have been proposed for the last glacial period and during the larger Pleistocene glaciations. The sparse data available over this sector of the Arctic Ocean have left the timing, extent and even existence of these ice sheets largely unresolved. Here we present new geophysical mapping and sediment coring data from the East Siberian shelf and slope collected during the 2014 SWERUS-C3 expedition (SWERUS-C3: Swedish -Russian -US Arctic Ocean Investigation of Climate-Cryosphere-Carbon Interactions). The multibeam bathymetry and chirp sub-bottom profiles reveal a set of glacial landforms that include grounding zone formations along the outer continental shelf, seaward of which lies a > 65 m thick sequence of glacio-genic debris flows. The glacial landforms are interpreted to lie at the seaward end of a glacial trough -the first to be reported on the East Siberian margin, here referred to as the De Long Trough because of its location due north of the De Long Islands. Stratigraphy and dating of sediment cores show that a drape of acoustically laminated sediments covering the glacial deposits is older than ∼ 50 cal kyr BP. This provides direct evidence for extensive glacial activity on the Siberian shelf that predates the Last Glacial Maximum and most likely occurred during the Saalian (Marine Isotope Stage (MIS) 6).

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Section: Introductionmentioning

confidence: 99%

The De Long Trough: a newly discovered glacial trough on the East Siberian continental margin

et al. 2017

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“…As also argued by Hogan et al (2016), such deposits can (cf. Syvitski et al, 1996;Dowdeswell et al, 1998Dowdeswell et al, , 2000.…”

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confidence: 64%

“…bergs (e.g. Elverhøi et al, 1980Elverhøi et al, , 1983Gilbert, 1983;Hogan et al, 2016 1948; Shanmugam et al, 1994;Forsberg et al, 1999). This seems reasonable,…”

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confidence: 95%

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Seafloor geomorphology and glacimarine sedimentation associated with fast-flowing ice sheet outlet glaciers in Disko Bay, West Greenland

Streuff

Cofaigh

Hogan

et al. 2017

Quaternary Science Reviews

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Citation for published item:treu'D uthrin nd ¡ y gofighD golm nd rognD uelly nd tenningsD enne nd vloydD teremy wF nd xoormetsD iko nd xielsenD ove nd uuijpersD entoon nd howdeswellD tulin eF nd einreeD ilhelm @PHIUA 9e)oor geomorphology nd glimrine sedimenttion ssoited with fstE)owing ie sheet outlet gliers in hisko fyD est qreenlndF9D uternry siene reviewsFD ITW F ppF PHTEPQHF 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-prot 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.

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“…AF1 can be clearly identified as bedrock but AF2 and AF3 have characteristics similar to subglacial diamicts. Such acoustic properties have previously been interpreted as subglacial tills (Cameron et al, 1992;Gatliff et al, 1994;Huuse and Lykke-Anderson, 2000;Dove et al, 2017), with the heterogeneous nature of diamictic sediments resulting in acoustic homogeneity when observed in seismic profile (Hogan et al, 2016). In contrast, AF3 forms distinctive, discontinuous sheets across the study area and has an average thickness of~4-10 m. It can thicken to 15-20 m where it forms the wedges.…”

Section: Subglacial Sediment and Landform Genesismentioning

confidence: 79%

The mixed‐bed glacial landform imprint of the North Sea Lobe in the western North Sea

Roberts

Grimoldi

Callard

et al. 2019

Earth Surf Processes Landf

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During the last glacial cycle an intriguing feature of the British‐Irish Ice Sheet was the North Sea Lobe (NSL); fed from the Firth of Forth and which flowed south and parallel to the English east coast. The controls on the formation and behaviour of the NSL have long been debated, but in the southern North Sea recent work suggests the NSL formed a dynamic, oscillating terrestrial margin operating over a deforming bed. Further north, however, little is known of the behaviour of the NSL or under what conditions it operated. This paper analyses new acoustic, sedimentary and geomorphic data in order to evaluate the glacial landsystem imprint and deglacial history of the NSL offshore from NE England. Subglacial tills (AF2/3) form a discontinuous mosaic interspersed with bedrock outcrops across the seafloor, with the partial excavation and advection of subglacial sediment during both advance and retreat producing mega‐scale glacial lineations and grounding zone wedges. The resultant ‘mixed‐bed’ glacial landsystem is the product of a dynamic switch from a terrestrial piedmont‐lobe margin with a net surplus of sediment to a partially erosive, quasi‐stable, marine‐terminating, ice stream lobe as the NSL withdrew northwards. Glaciomarine sediments (AF4) drape the underlying subglacial mixed‐bed imprint and point to a switch to tidewater conditions between 19.9 and 16.5 ka cal BP as the North Sea became inundated. The dominant controls on NSL recession during this period were changing ice flux through the Firth of Forth ice stream onset zone and water depths at the grounding line; the development of the mixed‐bed landsystem being a response to grounding line instability. © 2018 John Wiley & Sons, Ltd.

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Deglaciation of a major palaeo-ice stream in Disko Trough, West Greenland

Cited by 71 publications

References 77 publications

The De Long Trough: a newly discovered glacial trough on the East Siberian continental margin

The De Long Trough: a newly discovered glacial trough on the East Siberian continental margin

Seafloor geomorphology and glacimarine sedimentation associated with fast-flowing ice sheet outlet glaciers in Disko Bay, West Greenland

The mixed‐bed glacial landform imprint of the North Sea Lobe in the western North Sea

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