Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/30503
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Pattern, style and timing of British-Irish Ice Sheet retreat: Shetland and northern North Sea sector
Author(s): 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
Keywords: continental shelf
deglaciation
geochronology
ice sheet
Pleistocene
Issue Date: 21-Nov-2019
Citation: Bradwell T, Small D, Fabel D, Clark CD, Chiverrell RC, Saher MH, Dove D, Callard SL, Burke MJ, Moreton SG, Medialdea A, Bateman MD, Roberts DH, Golledge NR & Finlayson A (2019) Pattern, style and timing of British-Irish Ice Sheet retreat: Shetland and northern North Sea sector. Journal of Quaternary Science. https://doi.org/10.1002/jqs.3163
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 km2, 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 coalescent with the Fennoscandian Ice Sheet to the east. Between ~25 and 23 ka BP the ice sheet in this sector underwent a significant size reduction from ca. 85 000 to
DOI Link: 10.1002/jqs.3163
Rights: © 2019 The Authors. Journal of Quaternary Science Published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Notes: Output status: Forthcoming/Available Online Additional co-authors: Sally Morgan, Colm Ó Cofaigh
Licence URL(s): http://creativecommons.org/licenses/by/4.0/

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