Cosmogenic nuclide inheritance in Little Ice Age moraines - A case study from Greenland

Larsen, Nicolaj K.; Søndergaard, Anne; Levy, Laura B.; Laursen, Charlotte H.; Bjørk, Anders A.; Kjeldsen, Kristian K.; Funder, Svend; Strunk, Astrid; Olsen, Jesper; Kjær, Kurt H.

doi:10.1016/j.quageo.2021.101200

Cited by 8 publications

(11 citation statements)

References 84 publications

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“…Ice-margin retreat resumed after deposition of the Umîvît moraines at 8.2±0.2 ka, as determined by the 11 new 10 Be boulder dates presented here. Ice then retreated from the Keglen moraines at 8.0±0.1 ka (this study; Winsor et al, 2015;Levy et al, 2018), followed by retreat from the Ørkendalen moraines at 7.0±0.1 ka (Levy et al, 2012;Carlson et al, 2014;Larsen et al, 2021). The ice margin finally retreated within its historical extent at 6.7±0.1 ka (Levy et al, 2012;Carlson et al, 2014).…”

Section: Early Holocene Moraine Deposition In the Kangerlussuaq Regionmentioning

confidence: 65%

“…Australian Government for the Centre for Accelerator Science at ANSTO through the National Collaborative Research Infrastructure Strategy (NCRIS). show mean age of deglaciation (either arithmetic or error-weighted, with number of samples included in the mean indicated; the number of outliers is not indicated for figure clarity) (Levy et al, 2012;Carlson et al, 2014;Young et al, 2020;Larsen et al, 2021) while solid boxes contain individual boulder ages from our study and one example from Young et al (2020). Each box denotes associated moraine system of the samples.…”

Section: Discussionmentioning

confidence: 99%

“…The meansquare weighted deviation (MSWD) was utilized to identify the appropriate method of calculating the sample mean and uncertainty, where a MSWD >1 prompts an arithmetic mean and standard error while a MSWD <1 prompts an error-weighted mean and uncertainty (Cuzzone et al, 2016;Ullman et al, 2016). All previously published 10 Be ages (Levy et al, 2012;Carlson et al, 2014;Winsor et al, 2015;Lesnek & Briner, 2018;Young et al, 2020;Larsen et al, 2021) were recalculated using the same production rate and scaling scheme. In the case of the Keglen moraines, existing 10 Be ages were combined with our two new 10 Be ages for outlier detection.…”

Section: Methodsmentioning

confidence: 99%

“…The Ørkendalen moraines lie closest to the present ice margin (Fig. 2) and were first dated by Levy et al (2012) and subsequently by Carlson et al (2014) and Larsen et al (2021), with ice-margin abandonment of the moraines at 7.0±0.1 ka (Fig. 3) (arithmetic mean; n=20, 1 outlier).…”

Section: Introductionmentioning

confidence: 99%

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Southwest Greenland ice-sheet retreat during the 8.2 ka cold event

Carlson¹,

Reyes

Sillett

et al. 2021

Quaternary Science Reviews

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Section: Early Holocene Moraine Deposition In the Kangerlussuaq Regionmentioning

confidence: 65%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Southwest Greenland ice-sheet retreat during the 8.2 ka cold event

Carlson¹,

Reyes

Sillett

et al. 2021

Quaternary Science Reviews

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“…Some of the 10 Be ages have been either younger than the assumed deglaciation age because of postglacial exhumation or older because of nuclide inheritance (M. A. Kelly et al 2008;Larsen et al 2014Larsen et al , 2021Corbett et al 2015;Søndergaard et al 2019;Ceperley et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Late glacial and Holocene glaciation history of North and Northeast Greenland

Larsen

Søndergaard

Levy

et al. 2022

Arctic, Antarctic, and Alpine Research

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Northeast Greenland is the place where the Greenland Ice Sheet (GrIS) experienced the largest areal changes since the Last Glacial Maximum. However, the age constraints of the last deglaciation are in some areas sparse. In this study, we use forty-seven new 10 Be cosmogenic exposure ages to constrain the deglaciation of the present-day ice-free areas in Northeast Greenland. Our results show that the outer coast region was deglaciated between 12.8 ± 0.6 and 11.5 ± 0.2 ka and the region close to the present ice margin was deglaciated 2 to 4 ka later between 9.2 ± 0.3 to 8.6 ± 0.3 ka. By combining our new results with previously published data from North and Northeast Greenland, we find that the ice sheet advanced to the shelf edge between 26 and 20 cal. ka BP. The outer coast was deglaciated between 12.8 and 9.7 ka and the present ice extent was reached between 10.8 to 5.8 ka. The ice margin continued to retreat farther inland during the Middle Holocene before it readvanced toward its Little Ice Age position. The deglaciation was probably forced by a combination of increased atmospheric and ocean temperatures, but local topography also played an important role. These results add to the growing knowledge about the glaciation history of the GrIS and add useful constraints for future ice sheet models.

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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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Cosmogenic nuclide inheritance in Little Ice Age moraines - A case study from Greenland

Cited by 8 publications

References 84 publications

Southwest Greenland ice-sheet retreat during the 8.2 ka cold event

Southwest Greenland ice-sheet retreat during the 8.2 ka cold event

Late glacial and Holocene glaciation history of North and Northeast Greenland

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

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