Seafloor evidence for palaeo‐ice streaming and calving of the grounded Irish Sea Ice Stream: Implications for the interpretation of its final deglaciation phase
High resolution swath bathymetry data reveal a previously glaciated submarine terrain 20 km offshore Anglesey, north Wales, UK. The detailed documentation of remarkably well‐preserved subglacial and ice‐marginal bedforms provides evidence for a grounded part of the Irish Sea Ice Stream in a phase of...
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crwiley:10.1111/j.1502-3885.2008.00041.x 2024-06-02T08:14:18+00:00 Seafloor evidence for palaeo‐ice streaming and calving of the grounded Irish Sea Ice Stream: Implications for the interpretation of its final deglaciation phase VAN LANDEGHEM, KATRIEN J. J. WHEELER, ANDY J. MITCHELL, NEIL C. 2009 http://dx.doi.org/10.1111/j.1502-3885.2008.00041.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1502-3885.2008.00041.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1502-3885.2008.00041.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Boreas volume 38, issue 1, page 119-131 ISSN 0300-9483 1502-3885 journal-article 2009 crwiley https://doi.org/10.1111/j.1502-3885.2008.00041.x 2024-05-03T11:26:33Z High resolution swath bathymetry data reveal a previously glaciated submarine terrain 20 km offshore Anglesey, north Wales, UK. The detailed documentation of remarkably well‐preserved subglacial and ice‐marginal bedforms provides evidence for a grounded part of the Irish Sea Ice Stream in a phase of deglaciation. The observed ribbed moraines, drumlins, flutes and eskers indicate a converging ice flow to the west, which then turns south into the deeper central Irish Sea Basin. Using the relative position of the bedforms, their spatial distribution and the morphological resemblance with bedforms described in the literature, this subglacial terrain is interpreted as representing a transition zone of frozen to thawed bed conditions during deglaciation, with an eastwards migrating thawing front that partly altered the edge of the surveyed ribbed moraine field by drumlinization. The abundant De Geer moraines and iceberg scour marks superimposed on drumlins and flutes reveal that the final retreat of the grounded ice margin in the surveyed area terminated into a water‐mass with extensive iceberg calving. As the glacial terrain is well preserved, no significant burial has taken place, either by glacially or terrestrially derived sediment. The strong tidal currents at present keep the submarine terrain swept clean of contemporary sediment cover. Article in Journal/Newspaper Sea ice Wiley Online Library Boreas 38 1 119 131 |
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Open Polar |
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Wiley Online Library |
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crwiley |
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English |
description |
High resolution swath bathymetry data reveal a previously glaciated submarine terrain 20 km offshore Anglesey, north Wales, UK. The detailed documentation of remarkably well‐preserved subglacial and ice‐marginal bedforms provides evidence for a grounded part of the Irish Sea Ice Stream in a phase of deglaciation. The observed ribbed moraines, drumlins, flutes and eskers indicate a converging ice flow to the west, which then turns south into the deeper central Irish Sea Basin. Using the relative position of the bedforms, their spatial distribution and the morphological resemblance with bedforms described in the literature, this subglacial terrain is interpreted as representing a transition zone of frozen to thawed bed conditions during deglaciation, with an eastwards migrating thawing front that partly altered the edge of the surveyed ribbed moraine field by drumlinization. The abundant De Geer moraines and iceberg scour marks superimposed on drumlins and flutes reveal that the final retreat of the grounded ice margin in the surveyed area terminated into a water‐mass with extensive iceberg calving. As the glacial terrain is well preserved, no significant burial has taken place, either by glacially or terrestrially derived sediment. The strong tidal currents at present keep the submarine terrain swept clean of contemporary sediment cover. |
format |
Article in Journal/Newspaper |
author |
VAN LANDEGHEM, KATRIEN J. J. WHEELER, ANDY J. MITCHELL, NEIL C. |
spellingShingle |
VAN LANDEGHEM, KATRIEN J. J. WHEELER, ANDY J. MITCHELL, NEIL C. Seafloor evidence for palaeo‐ice streaming and calving of the grounded Irish Sea Ice Stream: Implications for the interpretation of its final deglaciation phase |
author_facet |
VAN LANDEGHEM, KATRIEN J. J. WHEELER, ANDY J. MITCHELL, NEIL C. |
author_sort |
VAN LANDEGHEM, KATRIEN J. J. |
title |
Seafloor evidence for palaeo‐ice streaming and calving of the grounded Irish Sea Ice Stream: Implications for the interpretation of its final deglaciation phase |
title_short |
Seafloor evidence for palaeo‐ice streaming and calving of the grounded Irish Sea Ice Stream: Implications for the interpretation of its final deglaciation phase |
title_full |
Seafloor evidence for palaeo‐ice streaming and calving of the grounded Irish Sea Ice Stream: Implications for the interpretation of its final deglaciation phase |
title_fullStr |
Seafloor evidence for palaeo‐ice streaming and calving of the grounded Irish Sea Ice Stream: Implications for the interpretation of its final deglaciation phase |
title_full_unstemmed |
Seafloor evidence for palaeo‐ice streaming and calving of the grounded Irish Sea Ice Stream: Implications for the interpretation of its final deglaciation phase |
title_sort |
seafloor evidence for palaeo‐ice streaming and calving of the grounded irish sea ice stream: implications for the interpretation of its final deglaciation phase |
publisher |
Wiley |
publishDate |
2009 |
url |
http://dx.doi.org/10.1111/j.1502-3885.2008.00041.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1502-3885.2008.00041.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1502-3885.2008.00041.x |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Boreas volume 38, issue 1, page 119-131 ISSN 0300-9483 1502-3885 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1502-3885.2008.00041.x |
container_title |
Boreas |
container_volume |
38 |
container_issue |
1 |
container_start_page |
119 |
op_container_end_page |
131 |
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1800738090961076224 |