Pattern, style and timing of British–Irish Ice Sheet retreat: Shetland and northern North Sea sector
ABSTRACT The offshore sector around Shetland remains one of the least well‐studied parts of the former British–Irish Ice Sheet with several long‐standing scientific issues unresolved. These key issues include (i) the dominance of a locally sourced ‘Shetland ice cap’ vs an invasive Fennoscandian Ice...
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crwiley:10.1002/jqs.3163 2024-09-15T18:06:05+00:00 Pattern, style and timing of British–Irish Ice Sheet retreat: Shetland and northern North Sea sector Bradwell, Tom Small, David Fabel, Derek Clark, Chris D. Chiverrell, Richard C. Saher, Margot H. Dove, Dayton Callard, S. Louise Burke, Matthew J. Moreton, Steven G. Medialdea, Alicia Bateman, Mark D. Roberts, David H. Golledge, Nicholas R. Finlayson, Andrew Morgan, Sally Cofaigh, Colm Ó Natural Environment Research Council 2019 http://dx.doi.org/10.1002/jqs.3163 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3163 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3163 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Journal of Quaternary Science volume 36, issue 5, page 681-722 ISSN 0267-8179 1099-1417 journal-article 2019 crwiley https://doi.org/10.1002/jqs.3163 2024-07-30T04:20:25Z ABSTRACT The offshore sector around Shetland remains one of the least well‐studied parts of the former British–Irish Ice Sheet with several long‐standing scientific issues unresolved. These key issues include (i) the dominance of a locally sourced ‘Shetland ice cap’ vs an invasive Fennoscandian Ice Sheet; (ii) the flow configuration and style of glaciation at the Last Glacial Maximum (i.e. terrestrial vs marine glaciation); (iii) the nature of confluence between the British–Irish and Fennoscandian Ice Sheets; (iv) the cause, style and rate of ice sheet separation; and (v) the wider implications of ice sheet uncoupling on the tempo of subsequent deglaciation. As part of the Britice‐Chrono project, we present new geological (seabed cores), geomorphological, marine geophysical and geochronological data from the northernmost sector of the last British–Irish Ice Sheet (north of 59.5°N) to address these questions. The study area covers ca. 95 000 km 2 , an area approximately the size of Ireland, and includes the islands of Shetland and the surrounding continental shelf, some of the continental slope, and the western margin of the Norwegian Channel. We collect and analyse data from onshore in Shetland and along key transects offshore, to establish the most coherent picture, so far, of former ice‐sheet deglaciation in this important sector. Alongside new seabed mapping and Quaternary sediment analysis, we use a multi‐proxy suite of new isotopic age assessments, including 32 cosmogenic‐nuclide exposure ages from glacially transported boulders and 35 radiocarbon dates from deglacial marine sediments, to develop a synoptic sector‐wide reconstruction combining strong onshore and offshore geological evidence with Bayesian chronosequence modelling. The results show widespread and significant spatial fluctuations in size, shape and flow configuration of an ice sheet/ice cap centred on, or to the east of, the Orkney–Shetland Platform, between ~30 and ~15 ka BP. At its maximum extent ca. 26–25 ka BP , this ice sheet was ... Article in Journal/Newspaper Fennoscandian Ice cap Ice Sheet Wiley Online Library Journal of Quaternary Science 36 5 681 722 |
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Wiley Online Library |
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crwiley |
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English |
description |
ABSTRACT The offshore sector around Shetland remains one of the least well‐studied parts of the former British–Irish Ice Sheet with several long‐standing scientific issues unresolved. These key issues include (i) the dominance of a locally sourced ‘Shetland ice cap’ vs an invasive Fennoscandian Ice Sheet; (ii) the flow configuration and style of glaciation at the Last Glacial Maximum (i.e. terrestrial vs marine glaciation); (iii) the nature of confluence between the British–Irish and Fennoscandian Ice Sheets; (iv) the cause, style and rate of ice sheet separation; and (v) the wider implications of ice sheet uncoupling on the tempo of subsequent deglaciation. As part of the Britice‐Chrono project, we present new geological (seabed cores), geomorphological, marine geophysical and geochronological data from the northernmost sector of the last British–Irish Ice Sheet (north of 59.5°N) to address these questions. The study area covers ca. 95 000 km 2 , an area approximately the size of Ireland, and includes the islands of Shetland and the surrounding continental shelf, some of the continental slope, and the western margin of the Norwegian Channel. We collect and analyse data from onshore in Shetland and along key transects offshore, to establish the most coherent picture, so far, of former ice‐sheet deglaciation in this important sector. Alongside new seabed mapping and Quaternary sediment analysis, we use a multi‐proxy suite of new isotopic age assessments, including 32 cosmogenic‐nuclide exposure ages from glacially transported boulders and 35 radiocarbon dates from deglacial marine sediments, to develop a synoptic sector‐wide reconstruction combining strong onshore and offshore geological evidence with Bayesian chronosequence modelling. The results show widespread and significant spatial fluctuations in size, shape and flow configuration of an ice sheet/ice cap centred on, or to the east of, the Orkney–Shetland Platform, between ~30 and ~15 ka BP. At its maximum extent ca. 26–25 ka BP , this ice sheet was ... |
author2 |
Natural Environment Research Council |
format |
Article in Journal/Newspaper |
author |
Bradwell, Tom Small, David Fabel, Derek Clark, Chris D. Chiverrell, Richard C. Saher, Margot H. Dove, Dayton Callard, S. Louise Burke, Matthew J. Moreton, Steven G. Medialdea, Alicia Bateman, Mark D. Roberts, David H. Golledge, Nicholas R. Finlayson, Andrew Morgan, Sally Cofaigh, Colm Ó |
spellingShingle |
Bradwell, Tom Small, David Fabel, Derek Clark, Chris D. Chiverrell, Richard C. Saher, Margot H. Dove, Dayton Callard, S. Louise Burke, Matthew J. Moreton, Steven G. Medialdea, Alicia Bateman, Mark D. Roberts, David H. Golledge, Nicholas R. Finlayson, Andrew Morgan, Sally Cofaigh, Colm Ó Pattern, style and timing of British–Irish Ice Sheet retreat: Shetland and northern North Sea sector |
author_facet |
Bradwell, Tom Small, David Fabel, Derek Clark, Chris D. Chiverrell, Richard C. Saher, Margot H. Dove, Dayton Callard, S. Louise Burke, Matthew J. Moreton, Steven G. Medialdea, Alicia Bateman, Mark D. Roberts, David H. Golledge, Nicholas R. Finlayson, Andrew Morgan, Sally Cofaigh, Colm Ó |
author_sort |
Bradwell, Tom |
title |
Pattern, style and timing of British–Irish Ice Sheet retreat: Shetland and northern North Sea sector |
title_short |
Pattern, style and timing of British–Irish Ice Sheet retreat: Shetland and northern North Sea sector |
title_full |
Pattern, style and timing of British–Irish Ice Sheet retreat: Shetland and northern North Sea sector |
title_fullStr |
Pattern, style and timing of British–Irish Ice Sheet retreat: Shetland and northern North Sea sector |
title_full_unstemmed |
Pattern, style and timing of British–Irish Ice Sheet retreat: Shetland and northern North Sea sector |
title_sort |
pattern, style and timing of british–irish ice sheet retreat: shetland and northern north sea sector |
publisher |
Wiley |
publishDate |
2019 |
url |
http://dx.doi.org/10.1002/jqs.3163 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3163 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3163 |
genre |
Fennoscandian Ice cap Ice Sheet |
genre_facet |
Fennoscandian Ice cap Ice Sheet |
op_source |
Journal of Quaternary Science volume 36, issue 5, page 681-722 ISSN 0267-8179 1099-1417 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/jqs.3163 |
container_title |
Journal of Quaternary Science |
container_volume |
36 |
container_issue |
5 |
container_start_page |
681 |
op_container_end_page |
722 |
_version_ |
1810443586913697792 |