Implications of 36 Cl 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...
Published in: | Quaternary Science Reviews |
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Language: | English |
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2016
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Online Access: | https://research-portal.st-andrews.ac.uk/en/publications/075186b4-4f4c-450d-b585-a5365f0b1287 https://doi.org/10.1016/j.quascirev.2016.08.028 https://research-repository.st-andrews.ac.uk/bitstream/10023/11550/1/Bates_2016_QSR_Implications_AAM.pdf http://www.sciencedirect.com/science/article/pii/S0277379116303183#appd001 |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/075186b4-4f4c-450d-b585-a5365f0b1287 2024-09-15T18:12:31+00:00 Implications of 36 Cl 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, C. Richard Benn, Douglas I. Scourse, James D. Bourlès, Didier L. Hibbert, Fiona Danielle 2016-10-15 application/pdf https://research-portal.st-andrews.ac.uk/en/publications/075186b4-4f4c-450d-b585-a5365f0b1287 https://doi.org/10.1016/j.quascirev.2016.08.028 https://research-repository.st-andrews.ac.uk/bitstream/10023/11550/1/Bates_2016_QSR_Implications_AAM.pdf http://www.sciencedirect.com/science/article/pii/S0277379116303183#appd001 eng eng https://research-portal.st-andrews.ac.uk/en/publications/075186b4-4f4c-450d-b585-a5365f0b1287 info:eu-repo/semantics/openAccess Small , D , Rinterknecht , V , Austin , W E N , Bates , C R , Benn , D I , Scourse , J D , Bourlès , D L , Hibbert , F D & ASTER Team 2016 , ' Implications of 36 Cl 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 Deglaciation Scotland Cosmogenic exposure ages Chlorine-36 article 2016 ftunstandrewcris https://doi.org/10.1016/j.quascirev.2016.08.028 2024-08-28T23:42:37Z 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 St Andrews: Research Portal Quaternary Science Reviews 150 130 145 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Deglaciation Scotland Cosmogenic exposure ages Chlorine-36 |
spellingShingle |
Deglaciation Scotland Cosmogenic exposure ages Chlorine-36 Small, David Rinterknecht, Vincent Austin, William E. N. Bates, C. Richard Benn, Douglas I. Scourse, James D. Bourlès, Didier L. Hibbert, Fiona Danielle Implications of 36 Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics |
topic_facet |
Deglaciation Scotland Cosmogenic exposure ages Chlorine-36 |
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, C. Richard Benn, Douglas I. Scourse, James D. Bourlès, Didier L. Hibbert, Fiona Danielle |
author_facet |
Small, David Rinterknecht, Vincent Austin, William E. N. Bates, C. Richard Benn, Douglas I. Scourse, James D. Bourlès, Didier L. Hibbert, Fiona Danielle |
author_sort |
Small, David |
title |
Implications of 36 Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics |
title_short |
Implications of 36 Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics |
title_full |
Implications of 36 Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics |
title_fullStr |
Implications of 36 Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics |
title_full_unstemmed |
Implications of 36 Cl exposure ages from Skye, northwest Scotland for the timing of ice stream deglaciation and deglacial ice dynamics |
title_sort |
implications of 36 cl exposure ages from skye, northwest scotland for the timing of ice stream deglaciation and deglacial ice dynamics |
publishDate |
2016 |
url |
https://research-portal.st-andrews.ac.uk/en/publications/075186b4-4f4c-450d-b585-a5365f0b1287 https://doi.org/10.1016/j.quascirev.2016.08.028 https://research-repository.st-andrews.ac.uk/bitstream/10023/11550/1/Bates_2016_QSR_Implications_AAM.pdf http://www.sciencedirect.com/science/article/pii/S0277379116303183#appd001 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Small , D , Rinterknecht , V , Austin , W E N , Bates , C R , Benn , D I , Scourse , J D , Bourlès , D L , Hibbert , F D & ASTER Team 2016 , ' Implications of 36 Cl 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_relation |
https://research-portal.st-andrews.ac.uk/en/publications/075186b4-4f4c-450d-b585-a5365f0b1287 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2016.08.028 |
container_title |
Quaternary Science Reviews |
container_volume |
150 |
container_start_page |
130 |
op_container_end_page |
145 |
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1810450097678319616 |