Improved 10Be and 26Al-AMS with a 5MV spectrometer

Xu, Sheng; Dougans, A.; Freeman, Stewart P.H.T.; Schnabel, Christoph; Wilcken, Klaus M.

doi:10.1016/j.nimb.2009.10.018

Cited by 94 publications

(65 citation statements)

References 6 publications

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“…Measurements of 10 Be/ 9 Be and 26 Al/ 27 Al isotopic ratios made in 2011 were conducted at the AMS facility at the Scottish Universities Environmental Research Centre (SUERC) in Glasgow, UK (Table 1). Measurements are normalised to the NIST SRM-4325 Be standard material with a revised (Nishiizumi et al, 2007) nominal 10 Be/ 9 Be ratio of 2.79 x 10 -11 and half-life of 1.387 Ma (Chmeleff et al, 2010;Korschinek et al, 2010), and the Purdue Z92-0222 Al standard material with a nominal 26 Al/ 27 Al ratio of 4.11 x 10 -11 which agrees with the Al standard material of Nishiizumi (2004) with half-life of 0.705 Ma (Xu et al, 2010). 10 Be/ 9 Be and 26 Al/ 27 Al isotopic ratios measured in 2006 at the ETH tandem AMS facility in Zurich, Switzerland, were normalised to their in-house S555 Be standard material and the ZAL94 Al standard material; the data in Table 1 have been renormalized Christl, 2010, Christl et al, 2013) to be consistent with the SUERC data and therefore the 07KNSTD (Be) and KNSTD (Al) standards (Nishiizumi et al, 2007;Nishiizumi, 2004).…”

Section: Samples and Methodsmentioning

confidence: 61%

Emergence of the Shackleton Range from beneath the Antarctic Ice Sheet due to glacial erosion

Sugden¹,

Fogwill

Hein³

et al. 2014

Geomorphology

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This paper explores the long-term evolution of a subglacial fjord landscape in the Shackleton Range, Antarctica. We propose that prolonged ice-sheet erosion across a passive continental margin caused troughs to deepen and lower the surrounding icesheet surface, leaving adjacent mountains exposed. Geomorphological evidence suggests a change in the direction of regional ice flow accompanied emergence. Simple calculations suggest that isostatic compensation caused by the deepening of bounding ice-stream troughs lowered the ice-sheet surface relative to the mountains by ~ 800 m. Use of multiple cosmogenic isotopes on bedrock and erratics ( 26 Al, 10 Be, 21 Ne) provides evidence that overriding of the massif and the deepening of the adjacent troughs occurred earlier than the Quaternary. Perhaps this occurred in the mid-Miocene, as elsewhere in East Antarctica in the McMurdo Dry Valleys and the Lambert basin. The implication is that glacial erosion instigates feedback which can change ice-sheet thickness, extent and direction of flow. Indeed, as the sub-glacial troughs evolve over millions of years, they increase topographic relief and this changes the dynamics of the ice sheet.

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Section: Samples and Methodsmentioning

confidence: 61%

Emergence of the Shackleton Range from beneath the Antarctic Ice Sheet due to glacial erosion

Sugden¹,

Fogwill

Hein³

et al. 2014

Geomorphology

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“…10 Be extraction and target preparation followed procedures modified from Kohl and Nishiizumi (1992) and Child et al (2000). The 10 Be/ 9 Be ratios were measured using the 5 MV accelerator mass spectrometer (AMS) at SUERC (Xu et al, 2010). The Be ratios were converted to nuclide concentration in quartz.…”

Section: Field and Laboratory Methodsmentioning

confidence: 99%

Late-Holocene and Younger Dryas glaciers in the northern Cairngorm Mountains, Scotland

Kirkbride

Everest

Benn³

et al. 2013

The Holocene

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We present 17 cosmogenic 10 Be ages of glacial deposits in Coire an Lochain (Cairngorm Mountains), which demonstrate that glacial and nival deposits cover a longer timescale than previously recognised. Five ages provide the first evidence of a late-Holocene glacier in the British Isles. A previously unidentified moraine ridge was deposited after c. 2.8 kyr and defines a small slab-like glacier with an equilibrium line altitude (ELA) at c. 1047 m. The late-Holocene glacier was characterised by rapid firnification and a dominance of sliding, enabling the glacier to construct moraine ridges in a relatively short period. Isotopic inheritance means that the glacier may have existed as recently as the 'Little Ice Age' (LIA) of the 17th or 18th century ad, a view supported by glacier-climate modelling. Nine 10 Be ages confirm a Younger Dryas Stadial (YDS) age for a cirque-floor boulder till, and date the glacier maximum to c. 12.3 kyr when the ELA was at c. 963 m altitude. Both glaciers existed because of enhanced accumulation from wind-blown snow, but the difference in ELA of only c. 84 m belies the YDS-LIA temperature difference of c. 7°C and emphasises the glacioclimatic contrast between the two periods. Three 10 Be ages from till boulders originally deposited in the YDS yield ages <5.5 kyr and indicate snow-avalanche disturbance of older debris since the mid-Holocene, as climate deteriorated towards marginal glaciation.

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“…2 shows the long-term measurements of the standard Al01-5-3 with the lowest 26 Al/ 27 Al ratio since the new detector configuration was adopted in 2011. The early 26 Al/ 27 Al data were excluded because the 26 Al 3+ determination for the standard Al01-5-3 was significantly interfered by 9 Be + , 17 O 2+ , 35 Cl 4+ and 37 Cl 4+ ions when the early conventional Mylar detector window was configured [11,12]. It should be pointed out that such the inferences are simply not an issue for other standards with high 26 Al activity.…”

Section: Resultsmentioning

confidence: 99%

“…Such high-precision measurements were facilitated >2 mg graphite target materials which produce stable ion beam and have long target longevity, in addition to the relatively high C À ionization efficiency. In case of our routine 10 Be and 26 Al analysis, however, the added amount of 9 Be carrier is in range of 200-250 lg and the 27 Al content in the sample is adjusted to be $1 mg by adding various amounts of 27 Al carrier depending on the native 27 Al concentration in quartz.…”

Section: Resultsmentioning

confidence: 99%

“…Our analysis compiles data from primary (NIST SRM4325 for 10 Be, Purdue Z92-0222 for 26 Al and Purdue Z93-0005 for 36 Cl) and secondary (Nishiizumi's series for 10 Be, 26 Al and 36 Cl) reference samples with 10 Be/ 9 Be, 26 Al/ 27 Al and 36 Cl/Cl ratios ranging between 10 À11 and 10 À13 [6][7][8]. Some previously published results of the secondary standards (Be01-6-2, Al01-5-3 and Cl_5E-13) have been also included [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Decadal 10Be, 26Al and 36Cl QA measurements on the SUERC 5 MV accelerator mass spectrometer

Freeman

Rood

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

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Improved 10Be and 26Al-AMS with a 5MV spectrometer

Cited by 94 publications

References 6 publications

Emergence of the Shackleton Range from beneath the Antarctic Ice Sheet due to glacial erosion

Emergence of the Shackleton Range from beneath the Antarctic Ice Sheet due to glacial erosion

Late-Holocene and Younger Dryas glaciers in the northern Cairngorm Mountains, Scotland

Decadal 10Be, 26Al and 36Cl QA measurements on the SUERC 5 MV accelerator mass spectrometer

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