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, Bourles, Didier L., Hibbert, Fiona D.
Format: Article in Journal/Newspaper
Language:English
Published: 2016
Subjects:
Online Access:https://research.bangor.ac.uk/portal/en/researchoutputs/implications-of-36cl-exposure-ages-from-skye-northwest-scotland-for-the-timing-of-ice-stream-deglaciation-and-deglacial-ice-dynamics(614988e2-04ae-4d6e-a1fd-71c00643c87d).html
https://doi.org/10.1016/j.quascirev.2016.08.028
https://research.bangor.ac.uk/ws/files/16608852/Small_et_al_JQSR_D_16_00230R1.pdf
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author Small, David
Rinterknecht, Vincent
Austin, William E.N.
Bates, Richard
Benn, Douglas I.
Scourse, James
Bourles, Didier L.
Hibbert, Fiona D.
author_facet Small, David
Rinterknecht, Vincent
Austin, William E.N.
Bates, Richard
Benn, Douglas I.
Scourse, James
Bourles, Didier L.
Hibbert, Fiona D.
author_sort Small, David
collection Bangor University: Research Portal
container_start_page 130
container_title Quaternary Science Reviews
container_volume 150
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.
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op_doi https://doi.org/10.1016/j.quascirev.2016.08.028
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op_source Small , D , Rinterknecht , V , Austin , W E N , Bates , R , Benn , D I , Scourse , J , Bourles , 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
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spelling ftuwalesbangcris:oai:research.bangor.ac.uk:publications/614988e2-04ae-4d6e-a1fd-71c00643c87d 2025-01-16T22:26:58+00:00 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 Bourles, Didier L. Hibbert, Fiona D. 2016-10-15 application/pdf https://research.bangor.ac.uk/portal/en/researchoutputs/implications-of-36cl-exposure-ages-from-skye-northwest-scotland-for-the-timing-of-ice-stream-deglaciation-and-deglacial-ice-dynamics(614988e2-04ae-4d6e-a1fd-71c00643c87d).html https://doi.org/10.1016/j.quascirev.2016.08.028 https://research.bangor.ac.uk/ws/files/16608852/Small_et_al_JQSR_D_16_00230R1.pdf eng eng info:eu-repo/semantics/openAccess Small , D , Rinterknecht , V , Austin , W E N , Bates , R , Benn , D I , Scourse , J , Bourles , 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 ftuwalesbangcris https://doi.org/10.1016/j.quascirev.2016.08.028 2021-12-26T12:05:38Z 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 Bangor University: Research Portal Barra ENVELOPE(-61.417,-61.417,-64.367,-64.367) Quaternary Science Reviews 150 130 145
spellingShingle Small, David
Rinterknecht, Vincent
Austin, William E.N.
Bates, Richard
Benn, Douglas I.
Scourse, James
Bourles, 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
title 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_short 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
url https://research.bangor.ac.uk/portal/en/researchoutputs/implications-of-36cl-exposure-ages-from-skye-northwest-scotland-for-the-timing-of-ice-stream-deglaciation-and-deglacial-ice-dynamics(614988e2-04ae-4d6e-a1fd-71c00643c87d).html
https://doi.org/10.1016/j.quascirev.2016.08.028
https://research.bangor.ac.uk/ws/files/16608852/Small_et_al_JQSR_D_16_00230R1.pdf