Elsterian ice‐sheet retreat in the southern North Sea: antecedent controls on large‐scale glaciotectonics and subglacial bed conditions
High‐resolution shallow sub‐bottom seismic survey data obtained for the Dudgeon windfarm site located 50 km offshore of the north Norfolk coast in the southern North Sea have revealed that the chalk bedrock in this area is overlain by sediments deposited during the Elsterian and Weichselian glacial...
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crwiley:10.1111/bor.12410 2024-09-15T18:12:15+00:00 Elsterian ice‐sheet retreat in the southern North Sea: antecedent controls on large‐scale glaciotectonics and subglacial bed conditions Mellett, Claire L. Phillips, Emrys Lee, Jonathan R. Cotterill, Carol J. Tjelta, Tor Inge James, Leo Duffy, Callum 2019 http://dx.doi.org/10.1111/bor.12410 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12410 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12410 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12410 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Boreas volume 49, issue 1, page 129-151 ISSN 0300-9483 1502-3885 journal-article 2019 crwiley https://doi.org/10.1111/bor.12410 2024-07-11T04:39:01Z High‐resolution shallow sub‐bottom seismic survey data obtained for the Dudgeon windfarm site located 50 km offshore of the north Norfolk coast in the southern North Sea have revealed that the chalk bedrock in this area is overlain by sediments deposited during the Elsterian and Weichselian glacial periods. A buried N–S‐trending subglacial drainage channel (tunnel valley) filled with Swarte Bank Formation ( MIS 12) sediments indicates that the maximum extent of the Elsterian ice‐sheet margin occurred further to the south. Detailed cross‐sections constructed from the seismic data reveal the presence of buried thrust‐block moraine system composed of deformed (folded and thrusted) Swarte Bank Formation sediments, lying beneath a younger sequence of sediments dominated by the glacigenic Bolders Bank Formation ( MIS 2). The geometry of the folds and sense of offset on the thrusts, coupled with the morphology of the ridge‐like landforms within this buried moraine system, are consistent with deformation having occurred in response to ice‐push from the N/ NE . The chalk bedrock that underlies the glaciotectonized sequence is thought to have provided an antecedent control on the location and preservation of this moraine system. A three‐phase model is proposed to explain the evolution of this thrust‐moraine complex that formed at the oscillating ice margin during the overall active retreat of the Elsterian ice sheet. Article in Journal/Newspaper Ice Sheet Wiley Online Library Boreas 49 1 129 151 |
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Wiley Online Library |
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crwiley |
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English |
description |
High‐resolution shallow sub‐bottom seismic survey data obtained for the Dudgeon windfarm site located 50 km offshore of the north Norfolk coast in the southern North Sea have revealed that the chalk bedrock in this area is overlain by sediments deposited during the Elsterian and Weichselian glacial periods. A buried N–S‐trending subglacial drainage channel (tunnel valley) filled with Swarte Bank Formation ( MIS 12) sediments indicates that the maximum extent of the Elsterian ice‐sheet margin occurred further to the south. Detailed cross‐sections constructed from the seismic data reveal the presence of buried thrust‐block moraine system composed of deformed (folded and thrusted) Swarte Bank Formation sediments, lying beneath a younger sequence of sediments dominated by the glacigenic Bolders Bank Formation ( MIS 2). The geometry of the folds and sense of offset on the thrusts, coupled with the morphology of the ridge‐like landforms within this buried moraine system, are consistent with deformation having occurred in response to ice‐push from the N/ NE . The chalk bedrock that underlies the glaciotectonized sequence is thought to have provided an antecedent control on the location and preservation of this moraine system. A three‐phase model is proposed to explain the evolution of this thrust‐moraine complex that formed at the oscillating ice margin during the overall active retreat of the Elsterian ice sheet. |
format |
Article in Journal/Newspaper |
author |
Mellett, Claire L. Phillips, Emrys Lee, Jonathan R. Cotterill, Carol J. Tjelta, Tor Inge James, Leo Duffy, Callum |
spellingShingle |
Mellett, Claire L. Phillips, Emrys Lee, Jonathan R. Cotterill, Carol J. Tjelta, Tor Inge James, Leo Duffy, Callum Elsterian ice‐sheet retreat in the southern North Sea: antecedent controls on large‐scale glaciotectonics and subglacial bed conditions |
author_facet |
Mellett, Claire L. Phillips, Emrys Lee, Jonathan R. Cotterill, Carol J. Tjelta, Tor Inge James, Leo Duffy, Callum |
author_sort |
Mellett, Claire L. |
title |
Elsterian ice‐sheet retreat in the southern North Sea: antecedent controls on large‐scale glaciotectonics and subglacial bed conditions |
title_short |
Elsterian ice‐sheet retreat in the southern North Sea: antecedent controls on large‐scale glaciotectonics and subglacial bed conditions |
title_full |
Elsterian ice‐sheet retreat in the southern North Sea: antecedent controls on large‐scale glaciotectonics and subglacial bed conditions |
title_fullStr |
Elsterian ice‐sheet retreat in the southern North Sea: antecedent controls on large‐scale glaciotectonics and subglacial bed conditions |
title_full_unstemmed |
Elsterian ice‐sheet retreat in the southern North Sea: antecedent controls on large‐scale glaciotectonics and subglacial bed conditions |
title_sort |
elsterian ice‐sheet retreat in the southern north sea: antecedent controls on large‐scale glaciotectonics and subglacial bed conditions |
publisher |
Wiley |
publishDate |
2019 |
url |
http://dx.doi.org/10.1111/bor.12410 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fbor.12410 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12410 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12410 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Boreas volume 49, issue 1, page 129-151 ISSN 0300-9483 1502-3885 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/bor.12410 |
container_title |
Boreas |
container_volume |
49 |
container_issue |
1 |
container_start_page |
129 |
op_container_end_page |
151 |
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1810449839245230080 |