Universität zu Köln

Roberts, David H., Grimoldi, Elena, Callard, Louise, Evans, David J. A., Clark, Chris D., Stewart, Heather A., Dove, Dayton, Saher, Margot, Cofaigh, Colm O., Chiverrell, Richard C., Bateman, Mark D., Moreton, Steven G., Bradwell, Tom ORCID: 0000-0003-0947-3309, Fabel, Derek and Medialdea, Alicia ORCID: 0000-0001-5895-0736 (2019). The mixed-bed glacial landform imprint of the North Sea Lobe in the western North Sea. Earth Surf. Process. Landf., 44 (6). S. 1233 - 1259. HOBOKEN: WILEY. ISSN 1096-9837

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Abstract

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. (c) 2018 John Wiley & Sons, Ltd.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Roberts, David H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grimoldi, Elena UNSPECIFIED UNSPECIFIED UNSPECIFIED Callard, Louise UNSPECIFIED UNSPECIFIED UNSPECIFIED Evans, David J. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Clark, Chris D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stewart, Heather A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dove, Dayton UNSPECIFIED UNSPECIFIED UNSPECIFIED Saher, Margot UNSPECIFIED UNSPECIFIED UNSPECIFIED Cofaigh, Colm O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chiverrell, Richard C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bateman, Mark D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Moreton, Steven G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bradwell, Tom UNSPECIFIED orcid.org/0000-0003-0947-3309 UNSPECIFIED Fabel, Derek UNSPECIFIED UNSPECIFIED UNSPECIFIED Medialdea, Alicia UNSPECIFIED orcid.org/0000-0001-5895-0736 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-149798
DOI:	10.1002/esp.4569
Journal or Publication Title:	Earth Surf. Process. Landf.
Volume:	44
Number:	6
Page Range:	S. 1233 - 1259
Date:	2019
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1096-9837
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PALAEO-ICE-STREAM; LATE DEVENSIAN DEGLACIATION; HIGH-RESOLUTION; EAST YORKSHIRE; SHEET DYNAMICS; MARINE STRATA; DENSITY FLOWS; DISKO TROUGH; BRITISH; PLEISTOCENE Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14979