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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ftarchimer:oai:archimer.ifremer.fr:46010 2023-05-15T16:41:15+02:00 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. Bourles, Didier L. Hibbert, Fiona D. 2016-10 application/pdf https://archimer.ifremer.fr/doc/00349/46010/83047.pdf https://doi.org/10.1016/j.quascirev.2016.08.028 https://archimer.ifremer.fr/doc/00349/46010/ eng eng Pergamon-elsevier Science Ltd https://archimer.ifremer.fr/doc/00349/46010/83047.pdf doi:10.1016/j.quascirev.2016.08.028 https://archimer.ifremer.fr/doc/00349/46010/ 2016 Elsevier Ltd. All rights reserved. info:eu-repo/semantics/openAccess restricted use Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2016-10 , Vol. 150 , P. 130-145 Deglaciation Scotland Cosmogenic exposure ages Chlorine-36 text Publication info:eu-repo/semantics/article 2016 ftarchimer https://doi.org/10.1016/j.quascirev.2016.08.028 2021-09-23T20:28:47Z 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 Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Barra ENVELOPE(-61.417,-61.417,-64.367,-64.367) Quaternary Science Reviews 150 130 145 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
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, Richard Benn, Douglas I. Scourse, James D. 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 |
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, Richard Benn, Douglas I. Scourse, James D. Bourles, Didier L. Hibbert, Fiona D. |
author_facet |
Small, David Rinterknecht, Vincent Austin, William E. N. Bates, Richard Benn, Douglas I. Scourse, James D. Bourles, 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 |
publisher |
Pergamon-elsevier Science Ltd |
publishDate |
2016 |
url |
https://archimer.ifremer.fr/doc/00349/46010/83047.pdf https://doi.org/10.1016/j.quascirev.2016.08.028 https://archimer.ifremer.fr/doc/00349/46010/ |
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 |
Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2016-10 , Vol. 150 , P. 130-145 |
op_relation |
https://archimer.ifremer.fr/doc/00349/46010/83047.pdf doi:10.1016/j.quascirev.2016.08.028 https://archimer.ifremer.fr/doc/00349/46010/ |
op_rights |
2016 Elsevier Ltd. All rights reserved. info:eu-repo/semantics/openAccess restricted use |
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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1766031688185413632 |