Implications of 36Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics

Geochronological constraints on the deglaciation of former marine based ice streams provide information on the rates and modes by which marine based ice sheets have responded to external forcing factors such as climate change. This paper presents new 36Cl cosmic ray exposure dating from boulders loc...

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Published in:Quaternary Science Reviews
Main Authors: Small, David, Rinterknecht, Vincent, Austin, William E.n., Bates, Richard, Benn, Douglas I., Scourse, James D., Bourlès, Didier L., Hibbert, Fiona D.
Format: Article in Journal/Newspaper
Language:English
Published: 2016
Subjects:
Online Access:https://pure.uhi.ac.uk/en/publications/25c9649e-df5d-4d7c-9d6f-bbd5a73b246a
https://doi.org/10.1016/j.quascirev.2016.08.028
https://research-repository.st-andrews.ac.uk/handle/10023/11550
https://linkinghub.elsevier.com/retrieve/pii/S0277379116303183
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spelling ftuhipublicatio:oai:pure.atira.dk:publications/25c9649e-df5d-4d7c-9d6f-bbd5a73b246a 2024-01-28T10:06:32+01:00 Implications of 36Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics Small, David Rinterknecht, Vincent Austin, William E.n. Bates, Richard Benn, Douglas I. Scourse, James D. Bourlès, Didier L. Hibbert, Fiona D. 2016-10-01 https://pure.uhi.ac.uk/en/publications/25c9649e-df5d-4d7c-9d6f-bbd5a73b246a https://doi.org/10.1016/j.quascirev.2016.08.028 https://research-repository.st-andrews.ac.uk/handle/10023/11550 https://linkinghub.elsevier.com/retrieve/pii/S0277379116303183 eng eng info:eu-repo/semantics/openAccess Small , D , Rinterknecht , V , Austin , W E N , Bates , R , Benn , D I , Scourse , J D , Bourlès , D L & Hibbert , F D 2016 , ' Implications of 36Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics ' , Quaternary Science Reviews , vol. 150 , pp. 130-145 . https://doi.org/10.1016/j.quascirev.2016.08.028 article 2016 ftuhipublicatio https://doi.org/10.1016/j.quascirev.2016.08.028 2024-01-04T23:21:25Z Geochronological constraints on the deglaciation of former marine based ice streams provide information on the rates and modes by which marine based ice sheets have responded to external forcing factors such as climate change. This paper presents new 36Cl cosmic ray exposure dating from boulders located on two moraines (Glen Brittle and Loch Scavaig) in southern Skye, northwest Scotland. Ages from the Glen Brittle moraines constrain deglaciation of a major marine terminating ice stream, the Barra-Donegal Ice Stream that drained the former British-Irish Ice Sheet, depending on choice of production method and scaling model this occurred 19.9 ± 1.5–17.6 ± 1.3 ka ago. We compare this timing of deglaciation to existing geochronological data and changes in a variety of potential forcing factors constrained through proxy records and numerical models to determine what deglaciation age is most consistent with existing evidence. Another small section of moraine, the Scavaig moraine, is traced offshore through multibeam swath-bathymetry and interpreted as delimiting a later stillstand/readvance stage following ice stream deglaciation. Additional cosmic ray exposure dating from the onshore portion of this moraine indicate that it was deposited 16.3 ± 1.3–15.2 ± 0.9 ka ago. When calculated using the most up-to-date scaling scheme this time of deposition is, within uncertainty, the same as the timing of a widely identified readvance, the Wester Ross Readvance, observed elsewhere in northwest Scotland. This extends the area over which this readvance has potentially occurred, reinforcing the view that it was climatically forced Article in Journal/Newspaper Ice Sheet University of the Highlands and Islands: Research Database of UHI Barra ENVELOPE(-61.417,-61.417,-64.367,-64.367) Quaternary Science Reviews 150 130 145
institution Open Polar
collection University of the Highlands and Islands: Research Database of UHI
op_collection_id ftuhipublicatio
language English
description Geochronological constraints on the deglaciation of former marine based ice streams provide information on the rates and modes by which marine based ice sheets have responded to external forcing factors such as climate change. This paper presents new 36Cl cosmic ray exposure dating from boulders located on two moraines (Glen Brittle and Loch Scavaig) in southern Skye, northwest Scotland. Ages from the Glen Brittle moraines constrain deglaciation of a major marine terminating ice stream, the Barra-Donegal Ice Stream that drained the former British-Irish Ice Sheet, depending on choice of production method and scaling model this occurred 19.9 ± 1.5–17.6 ± 1.3 ka ago. We compare this timing of deglaciation to existing geochronological data and changes in a variety of potential forcing factors constrained through proxy records and numerical models to determine what deglaciation age is most consistent with existing evidence. Another small section of moraine, the Scavaig moraine, is traced offshore through multibeam swath-bathymetry and interpreted as delimiting a later stillstand/readvance stage following ice stream deglaciation. Additional cosmic ray exposure dating from the onshore portion of this moraine indicate that it was deposited 16.3 ± 1.3–15.2 ± 0.9 ka ago. When calculated using the most up-to-date scaling scheme this time of deposition is, within uncertainty, the same as the timing of a widely identified readvance, the Wester Ross Readvance, observed elsewhere in northwest Scotland. This extends the area over which this readvance has potentially occurred, reinforcing the view that it was climatically forced
format Article in Journal/Newspaper
author Small, David
Rinterknecht, Vincent
Austin, William E.n.
Bates, Richard
Benn, Douglas I.
Scourse, James D.
Bourlès, Didier L.
Hibbert, Fiona D.
spellingShingle Small, David
Rinterknecht, Vincent
Austin, William E.n.
Bates, Richard
Benn, Douglas I.
Scourse, James D.
Bourlès, Didier L.
Hibbert, Fiona D.
Implications of 36Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics
author_facet Small, David
Rinterknecht, Vincent
Austin, William E.n.
Bates, Richard
Benn, Douglas I.
Scourse, James D.
Bourlès, Didier L.
Hibbert, Fiona D.
author_sort Small, David
title Implications of 36Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics
title_short Implications of 36Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics
title_full Implications of 36Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics
title_fullStr Implications of 36Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics
title_full_unstemmed Implications of 36Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics
title_sort implications of 36cl exposure ages from skye, northwest scotland for the timing of ice stream deglaciation and deglacial ice dynamics
publishDate 2016
url https://pure.uhi.ac.uk/en/publications/25c9649e-df5d-4d7c-9d6f-bbd5a73b246a
https://doi.org/10.1016/j.quascirev.2016.08.028
https://research-repository.st-andrews.ac.uk/handle/10023/11550
https://linkinghub.elsevier.com/retrieve/pii/S0277379116303183
long_lat ENVELOPE(-61.417,-61.417,-64.367,-64.367)
geographic Barra
geographic_facet Barra
genre Ice Sheet
genre_facet Ice Sheet
op_source Small , D , Rinterknecht , V , Austin , W E N , Bates , R , Benn , D I , Scourse , J D , Bourlès , D L & Hibbert , F D 2016 , ' Implications of 36Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics ' , Quaternary Science Reviews , vol. 150 , pp. 130-145 . https://doi.org/10.1016/j.quascirev.2016.08.028
op_rights info:eu-repo/semantics/openAccess
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