The mixed-bed glacial landform imprint of the North Sea Lobe in the western North Sea
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 southe...
Published in: | Earth Surface Processes and Landforms |
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Main Authors: | , , , , , , , , , , , , , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Wiley
2019
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Subjects: | |
Online Access: | http://hdl.handle.net/1893/28754 https://doi.org/10.1002/esp.4569 http://dspace.stir.ac.uk/bitstream/1893/28754/1/AAM_Roberts_etal_ESPL_2019.pdf |
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ftunivstirling:oai:dspace.stir.ac.uk:1893/28754 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
University of Stirling: Stirling Digital Research Repository |
op_collection_id |
ftunivstirling |
language |
English |
topic |
British‐Irish Ice Sheet North Sea Lobe ice stream onset mixed‐bed glacial landform assemblage |
spellingShingle |
British‐Irish Ice Sheet North Sea Lobe ice stream onset mixed‐bed glacial landform assemblage Roberts, David H Grimoldi, Elena Callard, Louise Evans, David J A Clark, Chris D Stewart, Heather A Dove, Dayton Saher, Margot Ó Cofaigh, Colm Chiverrell, Richard C Bateman, Mark D Moreton, Steven G Bradwell, Tom Fabel, Derek Medialdea, Alicia The mixed-bed glacial landform imprint of the North Sea Lobe in the western North Sea |
topic_facet |
British‐Irish Ice Sheet North Sea Lobe ice stream onset mixed‐bed glacial landform assemblage |
description |
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. |
author2 |
Durham University University of Sheffield British Geological Society Bangor University University of Liverpool NERC Radiocarbon Facility (SUERC) Biological and Environmental Sciences SUERC Radiocarbon Dating Laboratory University of Cologne orcid:0000-0003-0947-3309 |
format |
Article in Journal/Newspaper |
author |
Roberts, David H Grimoldi, Elena Callard, Louise Evans, David J A Clark, Chris D Stewart, Heather A Dove, Dayton Saher, Margot Ó Cofaigh, Colm Chiverrell, Richard C Bateman, Mark D Moreton, Steven G Bradwell, Tom Fabel, Derek Medialdea, Alicia |
author_facet |
Roberts, David H Grimoldi, Elena Callard, Louise Evans, David J A Clark, Chris D Stewart, Heather A Dove, Dayton Saher, Margot Ó Cofaigh, Colm Chiverrell, Richard C Bateman, Mark D Moreton, Steven G Bradwell, Tom Fabel, Derek Medialdea, Alicia |
author_sort |
Roberts, David H |
title |
The mixed-bed glacial landform imprint of the North Sea Lobe in the western North Sea |
title_short |
The mixed-bed glacial landform imprint of the North Sea Lobe in the western North Sea |
title_full |
The mixed-bed glacial landform imprint of the North Sea Lobe in the western North Sea |
title_fullStr |
The mixed-bed glacial landform imprint of the North Sea Lobe in the western North Sea |
title_full_unstemmed |
The mixed-bed glacial landform imprint of the North Sea Lobe in the western North Sea |
title_sort |
mixed-bed glacial landform imprint of the north sea lobe in the western north sea |
publisher |
Wiley |
publishDate |
2019 |
url |
http://hdl.handle.net/1893/28754 https://doi.org/10.1002/esp.4569 http://dspace.stir.ac.uk/bitstream/1893/28754/1/AAM_Roberts_etal_ESPL_2019.pdf |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Roberts DH, Grimoldi E, Callard L, Evans DJA, Clark CD, Stewart HA, Dove D, Saher M, Ó Cofaigh C, Chiverrell RC, Bateman MD, Moreton SG, Bradwell T, Fabel D & Medialdea A (2019) The mixed-bed glacial landform imprint of the North Sea Lobe in the western North Sea. Earth Surface Processes and Landforms , 44 (6), pp. 1233-1258. https://doi.org/10.1002/esp.4569 http://hdl.handle.net/1893/28754 doi:10.1002/esp.4569 1112425 http://dspace.stir.ac.uk/bitstream/1893/28754/1/AAM_Roberts_etal_ESPL_2019.pdf |
op_rights |
This item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. This is the peer reviewed version of the following article: Roberts, D. H., Grimoldi, E., Callard, L., Evans, D. J. A., Clark, C. D., Stewart, H. A., Dove, D., Saher, M., Ó Cofaigh, C., Chiverrell, R. C., Bateman, M. D., Moreton, S. G., Bradwell, T., Fabel, D., and Medialdea, A. ( 2019) The mixed‐bed glacial landform imprint of the North Sea Lobe in the western North Sea. Earth Surface Processes and Landforms, 44: 1233– 1258, which has been published in final form at https://doi.org/10.1002/esp.4569. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for self-archiving. https://storre.stir.ac.uk/STORREEndUserLicence.pdf 2019-12-13 [AAM_Roberts_etal_ESPL_2019.pdf] Publisher requires embargo of 12 months after formal publication. |
op_doi |
https://doi.org/10.1002/esp.4569 |
container_title |
Earth Surface Processes and Landforms |
container_volume |
44 |
container_issue |
6 |
container_start_page |
1233 |
op_container_end_page |
1258 |
_version_ |
1766031116508069888 |
spelling |
ftunivstirling:oai:dspace.stir.ac.uk:1893/28754 2023-05-15T16:40:42+02:00 The mixed-bed glacial landform imprint of the North Sea Lobe in the western North Sea Roberts, David H Grimoldi, Elena Callard, Louise Evans, David J A Clark, Chris D Stewart, Heather A Dove, Dayton Saher, Margot Ó Cofaigh, Colm Chiverrell, Richard C Bateman, Mark D Moreton, Steven G Bradwell, Tom Fabel, Derek Medialdea, Alicia Durham University University of Sheffield British Geological Society Bangor University University of Liverpool NERC Radiocarbon Facility (SUERC) Biological and Environmental Sciences SUERC Radiocarbon Dating Laboratory University of Cologne orcid:0000-0003-0947-3309 2019-05 application/pdf http://hdl.handle.net/1893/28754 https://doi.org/10.1002/esp.4569 http://dspace.stir.ac.uk/bitstream/1893/28754/1/AAM_Roberts_etal_ESPL_2019.pdf en eng Wiley Roberts DH, Grimoldi E, Callard L, Evans DJA, Clark CD, Stewart HA, Dove D, Saher M, Ó Cofaigh C, Chiverrell RC, Bateman MD, Moreton SG, Bradwell T, Fabel D & Medialdea A (2019) The mixed-bed glacial landform imprint of the North Sea Lobe in the western North Sea. Earth Surface Processes and Landforms , 44 (6), pp. 1233-1258. https://doi.org/10.1002/esp.4569 http://hdl.handle.net/1893/28754 doi:10.1002/esp.4569 1112425 http://dspace.stir.ac.uk/bitstream/1893/28754/1/AAM_Roberts_etal_ESPL_2019.pdf This item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. This is the peer reviewed version of the following article: Roberts, D. H., Grimoldi, E., Callard, L., Evans, D. J. A., Clark, C. D., Stewart, H. A., Dove, D., Saher, M., Ó Cofaigh, C., Chiverrell, R. C., Bateman, M. D., Moreton, S. G., Bradwell, T., Fabel, D., and Medialdea, A. ( 2019) The mixed‐bed glacial landform imprint of the North Sea Lobe in the western North Sea. Earth Surface Processes and Landforms, 44: 1233– 1258, which has been published in final form at https://doi.org/10.1002/esp.4569. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for self-archiving. https://storre.stir.ac.uk/STORREEndUserLicence.pdf 2019-12-13 [AAM_Roberts_etal_ESPL_2019.pdf] Publisher requires embargo of 12 months after formal publication. British‐Irish Ice Sheet North Sea Lobe ice stream onset mixed‐bed glacial landform assemblage Journal Article AM - Accepted Manuscript 2019 ftunivstirling https://doi.org/10.1002/esp.4569 2023-02-02T23:17:15Z 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. Article in Journal/Newspaper Ice Sheet University of Stirling: Stirling Digital Research Repository Earth Surface Processes and Landforms 44 6 1233 1258 |