Deglacial to postglacial palaeoenvironments of the Celtic Sea: Lacustrine conditions versus a continuous marine sequence
This is the author accepted manuscript. The final version is available from the publisher via the DOI in this record. Recent work on the last glaciation of the British Isles has led to an improved understanding of the nature and timing of the retreat of the British-Irish Ice Sheet (BIIS) from its so...
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ftunivexeter:oai:ore.exeter.ac.uk:10871/31575 2024-09-15T18:06:54+00:00 Deglacial to postglacial palaeoenvironments of the Celtic Sea: Lacustrine conditions versus a continuous marine sequence Furze, MFA Scourse, JD Pieńkowski, AJ Marret, F Hobbs, WO Carter, RA Long, BT 2014 http://hdl.handle.net/10871/31575 https://doi.org/10.1111/bor.12028 en eng Wiley Vol. 43, pp. 149 - 174 doi:10.1111/bor.12028 http://hdl.handle.net/10871/31575 0300-9483 Boreas © 2013 The Authors. Boreas © 2013 The Boreas Collegium Article 2014 ftunivexeter https://doi.org/10.1111/bor.12028 2024-07-29T03:24:16Z This is the author accepted manuscript. The final version is available from the publisher via the DOI in this record. Recent work on the last glaciation of the British Isles has led to an improved understanding of the nature and timing of the retreat of the British-Irish Ice Sheet (BIIS) from its southern maximum (Isles of Scilly), northwards into the Celtic and Irish seas. However, the nature of the deglacial environments across the Celtic Sea shelf, the extent of subaerial exposure and the existence (or otherwise) of a contiguous terrestrial linkage between Britain and Ireland following ice retreat remains ambiguous. Multiproxy research, based on analysis of 12 BGS vibrocores from the Celtic Deep Basin (CDB), seeks to address these issues. CDB cores exhibit a shell-rich upward fining sequence of Holocene marine sand above an erosional contact cut in laminated muds with infrequent lonestones. Molluscs, in situ Foraminifera and marine diatoms are absent from the basal muds, but rare damaged freshwater diatoms and foraminiferal linings occur. Dinoflagellate cysts and other non-pollen palynomorphs evidence diverse, environmentally incompatible floras with temperate, boreal and Arctic glaciomarine taxa co-occurring. Such multiproxy records can be interpreted as representing a retreating ice margin, with reworking of marine sediments into a lacustrine basin. Equally, the same record may be interpreted as recording similar conditions within a semi-enclosed marine embayment dominated by meltwater export and deposition of reworked microfossils. As assemblages from these cores contrast markedly with proven glaciomarine sequences from outside the CDB, a glaciolacustrine interpretation is favoured for the laminated sequence, truncated by a Late Weichselian transgressive sequence fining upwards into fully marine conditions. Reworked rare intertidal molluscs from immediately above the regional unconformity provide a minimum date c.13.9cal. ka BP for commencement of widespread marine erosion. Although suggestive of ... Article in Journal/Newspaper Foraminifera* Ice Sheet University of Exeter: Open Research Exeter (ORE) Boreas 43 1 149 174 |
institution |
Open Polar |
collection |
University of Exeter: Open Research Exeter (ORE) |
op_collection_id |
ftunivexeter |
language |
English |
description |
This is the author accepted manuscript. The final version is available from the publisher via the DOI in this record. Recent work on the last glaciation of the British Isles has led to an improved understanding of the nature and timing of the retreat of the British-Irish Ice Sheet (BIIS) from its southern maximum (Isles of Scilly), northwards into the Celtic and Irish seas. However, the nature of the deglacial environments across the Celtic Sea shelf, the extent of subaerial exposure and the existence (or otherwise) of a contiguous terrestrial linkage between Britain and Ireland following ice retreat remains ambiguous. Multiproxy research, based on analysis of 12 BGS vibrocores from the Celtic Deep Basin (CDB), seeks to address these issues. CDB cores exhibit a shell-rich upward fining sequence of Holocene marine sand above an erosional contact cut in laminated muds with infrequent lonestones. Molluscs, in situ Foraminifera and marine diatoms are absent from the basal muds, but rare damaged freshwater diatoms and foraminiferal linings occur. Dinoflagellate cysts and other non-pollen palynomorphs evidence diverse, environmentally incompatible floras with temperate, boreal and Arctic glaciomarine taxa co-occurring. Such multiproxy records can be interpreted as representing a retreating ice margin, with reworking of marine sediments into a lacustrine basin. Equally, the same record may be interpreted as recording similar conditions within a semi-enclosed marine embayment dominated by meltwater export and deposition of reworked microfossils. As assemblages from these cores contrast markedly with proven glaciomarine sequences from outside the CDB, a glaciolacustrine interpretation is favoured for the laminated sequence, truncated by a Late Weichselian transgressive sequence fining upwards into fully marine conditions. Reworked rare intertidal molluscs from immediately above the regional unconformity provide a minimum date c.13.9cal. ka BP for commencement of widespread marine erosion. Although suggestive of ... |
format |
Article in Journal/Newspaper |
author |
Furze, MFA Scourse, JD Pieńkowski, AJ Marret, F Hobbs, WO Carter, RA Long, BT |
spellingShingle |
Furze, MFA Scourse, JD Pieńkowski, AJ Marret, F Hobbs, WO Carter, RA Long, BT Deglacial to postglacial palaeoenvironments of the Celtic Sea: Lacustrine conditions versus a continuous marine sequence |
author_facet |
Furze, MFA Scourse, JD Pieńkowski, AJ Marret, F Hobbs, WO Carter, RA Long, BT |
author_sort |
Furze, MFA |
title |
Deglacial to postglacial palaeoenvironments of the Celtic Sea: Lacustrine conditions versus a continuous marine sequence |
title_short |
Deglacial to postglacial palaeoenvironments of the Celtic Sea: Lacustrine conditions versus a continuous marine sequence |
title_full |
Deglacial to postglacial palaeoenvironments of the Celtic Sea: Lacustrine conditions versus a continuous marine sequence |
title_fullStr |
Deglacial to postglacial palaeoenvironments of the Celtic Sea: Lacustrine conditions versus a continuous marine sequence |
title_full_unstemmed |
Deglacial to postglacial palaeoenvironments of the Celtic Sea: Lacustrine conditions versus a continuous marine sequence |
title_sort |
deglacial to postglacial palaeoenvironments of the celtic sea: lacustrine conditions versus a continuous marine sequence |
publisher |
Wiley |
publishDate |
2014 |
url |
http://hdl.handle.net/10871/31575 https://doi.org/10.1111/bor.12028 |
genre |
Foraminifera* Ice Sheet |
genre_facet |
Foraminifera* Ice Sheet |
op_relation |
Vol. 43, pp. 149 - 174 doi:10.1111/bor.12028 http://hdl.handle.net/10871/31575 0300-9483 Boreas |
op_rights |
© 2013 The Authors. Boreas © 2013 The Boreas Collegium |
op_doi |
https://doi.org/10.1111/bor.12028 |
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Boreas |
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43 |
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1 |
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149 |
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174 |
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1810444251033501696 |