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...
Published in: | Quaternary Science Reviews |
---|---|
Main Authors: | , , , , , , , |
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 |
id |
ftuhipublicatio:oai:pure.atira.dk:publications/25c9649e-df5d-4d7c-9d6f-bbd5a73b246a |
---|---|
record_format |
openpolar |
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 |
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 |
_version_ |
1789333478840467456 |