Inherited terrestrial cosmogenic nuclides in landscapes of selective glacial erosion: lessons from Lochnagar, Eastern Grampian Mountains, Scotland
Inheritance from prior exposure often complicates the interpretation of terrestrial cosmogenic nuclide (TCN) inventories in glaciated terrain. Lochnagar, a mountain in eastern Scotland, holds a clear geomorphological record of corrie glaciation and the thinning of the last Scottish ice sheet over th...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/537291/ https://nora.nerc.ac.uk/id/eprint/537291/1/J%20Quaternary%20Science%20-%202024%20-%20Hall%20-%20Inherited%20terrestrial%20cosmogenic%20nuclides%20in%20landscapes%20of%20selective%20glacial%20erosion%20.pdf https://doi.org/10.1002/jqs.3605 |
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ftnerc:oai:nora.nerc.ac.uk:537291 2024-05-12T08:05:18+00:00 Inherited terrestrial cosmogenic nuclides in landscapes of selective glacial erosion: lessons from Lochnagar, Eastern Grampian Mountains, Scotland Hall, Adrian M. Sugden, David E. Binnie, Steven A. Hein, Andy Dunai, Tibor Ritter, Benedikt Stewart, Margaret 2024-02-02 text http://nora.nerc.ac.uk/id/eprint/537291/ https://nora.nerc.ac.uk/id/eprint/537291/1/J%20Quaternary%20Science%20-%202024%20-%20Hall%20-%20Inherited%20terrestrial%20cosmogenic%20nuclides%20in%20landscapes%20of%20selective%20glacial%20erosion%20.pdf https://doi.org/10.1002/jqs.3605 en eng Wiley https://nora.nerc.ac.uk/id/eprint/537291/1/J%20Quaternary%20Science%20-%202024%20-%20Hall%20-%20Inherited%20terrestrial%20cosmogenic%20nuclides%20in%20landscapes%20of%20selective%20glacial%20erosion%20.pdf Hall, Adrian M.; Sugden, David E.; Binnie, Steven A.; Hein, Andy; Dunai, Tibor; Ritter, Benedikt; Stewart, Margaret. 2024 Inherited terrestrial cosmogenic nuclides in landscapes of selective glacial erosion: lessons from Lochnagar, Eastern Grampian Mountains, Scotland. Journal of Quaternary Science. https://doi.org/10.1002/jqs.3605 <https://doi.org/10.1002/jqs.3605> cc_by_nc_nd_4 Publication - Article PeerReviewed 2024 ftnerc https://doi.org/10.1002/jqs.3605 2024-04-17T14:01:54Z Inheritance from prior exposure often complicates the interpretation of terrestrial cosmogenic nuclide (TCN) inventories in glaciated terrain. Lochnagar, a mountain in eastern Scotland, holds a clear geomorphological record of corrie glaciation and the thinning of the last Scottish ice sheet over the last ~15 ka. Yet attempts to date the main stages in deglaciation after sampling of 21 granite boulders for 10Be, 26Al and 14C from corrie moraines, an ice sheet lateral moraine and boulder spreads revealed widespread, but variable, TCN inheritance. Only the youngest boulder ages fit within the range of expected deglaciation ages. To identify the sources of geological uncertainty, we provide simple models of ice cover duration and erosion histories for plateau, corrie and strath landscape domains, identify the variable nuclide inheritance that derives from different sources for boulders in these domains, and outline the effects of rotation, splitting and erosion of boulders during glacial transport. The combined effects increase clustering around arbitrary mean TCN values that exceed deglaciation ages. A further implication is that boulders have survived beneath overriding ice sheets. Such boulder trapping at Lochnagar may have resulted from topographic controls on katabatic winds and surface ablation acting on a thinning, cold-based ice sheet. Article in Journal/Newspaper Ice Sheet Natural Environment Research Council: NERC Open Research Archive Journal of Quaternary Science |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Inheritance from prior exposure often complicates the interpretation of terrestrial cosmogenic nuclide (TCN) inventories in glaciated terrain. Lochnagar, a mountain in eastern Scotland, holds a clear geomorphological record of corrie glaciation and the thinning of the last Scottish ice sheet over the last ~15 ka. Yet attempts to date the main stages in deglaciation after sampling of 21 granite boulders for 10Be, 26Al and 14C from corrie moraines, an ice sheet lateral moraine and boulder spreads revealed widespread, but variable, TCN inheritance. Only the youngest boulder ages fit within the range of expected deglaciation ages. To identify the sources of geological uncertainty, we provide simple models of ice cover duration and erosion histories for plateau, corrie and strath landscape domains, identify the variable nuclide inheritance that derives from different sources for boulders in these domains, and outline the effects of rotation, splitting and erosion of boulders during glacial transport. The combined effects increase clustering around arbitrary mean TCN values that exceed deglaciation ages. A further implication is that boulders have survived beneath overriding ice sheets. Such boulder trapping at Lochnagar may have resulted from topographic controls on katabatic winds and surface ablation acting on a thinning, cold-based ice sheet. |
format |
Article in Journal/Newspaper |
author |
Hall, Adrian M. Sugden, David E. Binnie, Steven A. Hein, Andy Dunai, Tibor Ritter, Benedikt Stewart, Margaret |
spellingShingle |
Hall, Adrian M. Sugden, David E. Binnie, Steven A. Hein, Andy Dunai, Tibor Ritter, Benedikt Stewart, Margaret Inherited terrestrial cosmogenic nuclides in landscapes of selective glacial erosion: lessons from Lochnagar, Eastern Grampian Mountains, Scotland |
author_facet |
Hall, Adrian M. Sugden, David E. Binnie, Steven A. Hein, Andy Dunai, Tibor Ritter, Benedikt Stewart, Margaret |
author_sort |
Hall, Adrian M. |
title |
Inherited terrestrial cosmogenic nuclides in landscapes of selective glacial erosion: lessons from Lochnagar, Eastern Grampian Mountains, Scotland |
title_short |
Inherited terrestrial cosmogenic nuclides in landscapes of selective glacial erosion: lessons from Lochnagar, Eastern Grampian Mountains, Scotland |
title_full |
Inherited terrestrial cosmogenic nuclides in landscapes of selective glacial erosion: lessons from Lochnagar, Eastern Grampian Mountains, Scotland |
title_fullStr |
Inherited terrestrial cosmogenic nuclides in landscapes of selective glacial erosion: lessons from Lochnagar, Eastern Grampian Mountains, Scotland |
title_full_unstemmed |
Inherited terrestrial cosmogenic nuclides in landscapes of selective glacial erosion: lessons from Lochnagar, Eastern Grampian Mountains, Scotland |
title_sort |
inherited terrestrial cosmogenic nuclides in landscapes of selective glacial erosion: lessons from lochnagar, eastern grampian mountains, scotland |
publisher |
Wiley |
publishDate |
2024 |
url |
http://nora.nerc.ac.uk/id/eprint/537291/ https://nora.nerc.ac.uk/id/eprint/537291/1/J%20Quaternary%20Science%20-%202024%20-%20Hall%20-%20Inherited%20terrestrial%20cosmogenic%20nuclides%20in%20landscapes%20of%20selective%20glacial%20erosion%20.pdf https://doi.org/10.1002/jqs.3605 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://nora.nerc.ac.uk/id/eprint/537291/1/J%20Quaternary%20Science%20-%202024%20-%20Hall%20-%20Inherited%20terrestrial%20cosmogenic%20nuclides%20in%20landscapes%20of%20selective%20glacial%20erosion%20.pdf Hall, Adrian M.; Sugden, David E.; Binnie, Steven A.; Hein, Andy; Dunai, Tibor; Ritter, Benedikt; Stewart, Margaret. 2024 Inherited terrestrial cosmogenic nuclides in landscapes of selective glacial erosion: lessons from Lochnagar, Eastern Grampian Mountains, Scotland. Journal of Quaternary Science. https://doi.org/10.1002/jqs.3605 <https://doi.org/10.1002/jqs.3605> |
op_rights |
cc_by_nc_nd_4 |
op_doi |
https://doi.org/10.1002/jqs.3605 |
container_title |
Journal of Quaternary Science |
_version_ |
1798847583971442688 |