2017
DOI: 10.1002/2016gl071276
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Cosmogenic 26Al/10Be surface production ratio in Greenland

Abstract: The assumed value for the cosmogenic 26Al/10Be surface production rate ratio in quartz is an important parameter for studies investigating the burial or subaerial erosion of long‐lived surfaces and sediments. Recent models and data suggest that the production ratio is spatially variable and may be greater than originally thought. Here we present measured 26Al/10Be ratios for 24 continuously exposed bedrock and boulder surfaces spanning ~61–77°N in Greenland. Empirical measurements, such as ours, include nuclid… Show more

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Cited by 48 publications
(29 citation statements)
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“…These data suggest the presence of a largely persistent, yet dynamic, ice sheet in northwestern Greenland by the Early Pleistocene . Decay-corrected 10 Be concentrations in diamict resemble 10 Be measurements of sediment discharged from the GrIS today ( Figure 2) and the decay-corrected 26 Al i / 10 Be i ratio, while uncertain, exceeds the observed Greenland surface production ratio (Corbett, Bierman, Rood, et al, 2017). These observations suggest that most subglacial material we analyzed was sourced from regions with high erosion rates.…”
Section: Discussionmentioning
confidence: 48%
See 1 more Smart Citation
“…These data suggest the presence of a largely persistent, yet dynamic, ice sheet in northwestern Greenland by the Early Pleistocene . Decay-corrected 10 Be concentrations in diamict resemble 10 Be measurements of sediment discharged from the GrIS today ( Figure 2) and the decay-corrected 26 Al i / 10 Be i ratio, while uncertain, exceeds the observed Greenland surface production ratio (Corbett, Bierman, Rood, et al, 2017). These observations suggest that most subglacial material we analyzed was sourced from regions with high erosion rates.…”
Section: Discussionmentioning
confidence: 48%
“…This early Pleistocene diamict is sourced from an area with minimal exposure and high erosion rates, and thus comprised of deeply eroded materials. The 1.9 Ma decay-corrected 26 Al i / 10 Be i ratio of this diamict (9.1 ± 1.5; weighted mean ± 1 sigma), while variable, is greater than the contemporary Greenland surface production ratio of 7.3 ± 0.3 (Corbett, Bierman, Rood, et al, 2017) (Table S6 and Figure S4). 26 Al i / 10 Be i ratios >7 are indicative of muon-induced production at depths of tens of meters for short (~100 kyr) periods (Balco, 2017).…”
Section: Glacial Erosion Of Pre-ice Sheet Regolith By the Early Pleismentioning
confidence: 83%
“…In landscapes where the cosmogenic nuclide inventories are a function of constant exposure or constant erosion, the ratio of 26 Al to 10 Be within sediments can be predicted based on the modeled (Lal, 1991;Balco et al, 2008) or measured (Corbett et al, 2017) ratios. Recent studies indicate that our samples should have natural 26 Al / 10 Be ratios of ∼ 6.75 (Balco et al, 2008), a value that is close to most of our measured ratios (Fig.…”
Section: Reliability Of Cosmogenic Erosion Rates In the Glaciated Olymentioning
confidence: 99%
“…In landscapes where the cosmogenic nuclide inventories are a function of constant exposure or constant erosion, the ratio of 26 Al to 10 Be within sediments can be predicted based on the modeled (Lal, 1991;Balco et al, 2008) or measured (Corbett et al, 2017) ratios. Recent studies indicate that our samples should have natural 26 Al / 10 Be ratios of ∼ 6.75 (Balco et al, 2008), a value that is close to most of our measured ratios (Fig.…”
Section: Reliability Of Cosmogenic Erosion Rates In the Glaciated Olymentioning
confidence: 99%