Britain and Ireland: glacial landforms from the Last Glacial Maximum

Hughes, Philip D.; Clark, Chris D.; Gibbard, Philip L.; Glasser, Neil F.; Tomkins, Matt D.

doi:10.1016/b978-0-12-823498-3.00033-9

Cited by 1 publication

(1 citation statement)

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“…There is general agreement that the Scottish ice sheet was sufficiently thick and extensive to cover all the mountain summits of the east Grampians at the Last Glacial Maximum that peaked at 25–27 ka (Hughes et al, 2022). Significant thinning of the ice sheet in eastern Scotland began around 19 ka (Phillips et al, 2008) and radiocarbon dates in kettle holes show that ice had disappeared from the upper Dee Valley by 14.6 ka (Huntley, 1994) and in Abernethy Forest in Strath Spey on the northern flanks of the Cairngorms by 14.7 ka (Vasari and Vasari, 1968).…”

Section: Introductionmentioning

confidence: 99%

Inherited terrestrial cosmogenic nuclides in landscapes of selective glacial erosion: lessons from Lochnagar, Eastern Grampian Mountains, Scotland

Hall,

Sugden,

Binnie

et al. 2024

J Quaternary Science

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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.

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