10Be: Half-life and AMS-standards

Hofmann, Hans; Beer, J.; Bonani, Georges; Gunten, H. R. von; Raman, S.; Suter, M.; Walker, R.L.; Wölfli, W.; Zimmermann, David

doi:10.1016/0168-583x(87)90198-4

Cited by 131 publications

(52 citation statements)

References 6 publications

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“…2 Calculated according to Dunne et al (1999). Be half-life of 1.51 x 10 6 years (Yiou & Raisbeck 1972;Hofmann et al 1987;Inn et al 1987). ) was used to correct for the background.…”

Section: Discussionmentioning

confidence: 99%

Evolution of a Lateglacial mountain icecap in northern Scotland

Finlayson

Golledge

Bradwell

et al. 2011

Boreas

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Detailed geomorphological mapping of the Beinn Dearg massif in northern Scotland, was conducted to examine the maximum (Younger Dryas) extent, and earlier interstadial evolution, of an ice cap that existed during the Lateglacial period (14.7 -11.7 cal. ka BP). Landform evidence indicates a plateau ice cap configuration, with radial outlet glaciers, during the Younger Dryas. The interpreted age is supported by new cosmogenic exposure ages, and previously reported interstadial sediments beyond the ice cap margin. The reconstructed Younger Dryas Beinn Dearg ice cap covered 176 km 2 , with its summit positioned over the western side of the massif. Area-altitude balance ratio (AABR) equilibrium line altitudes (ELAs) of 570 -580 m were calculated for the ice cap as a whole. The empirically reconstructed ice cap is compared with recent numerical model simulations; both methods produce an ice cap with a similar configuration. However, differences are apparent in the extent of eastern and western outlets (±1-5 km), and in the spatial variation of ELAs. Results suggest that the numerical simulation over-estimates the extent of western ice cap sectors, and under-estimates the extent of eastern ice cap sectors. We attempt to quantify these differences in terms of ice cap mass balance and assess their possible causes. Geomorphological evidence for pre-Younger Dryas ice cap configuration indicates that the Beinn Dearg massif remained an important source during earlier deglaciation. In contrast, the neighbouring Fannich mountains acted as an 'unzipping' zone, and were ice free on their northern side by the Allerød (Greenland Interstadial 1c to 1a). Deglaciation continued over western parts of the Beinn Dearg plateau, with the possibility that glaciers remained in some central and eastern catchments, prior to (Younger Dryas) ice cap (re)growth.Andrew Finlayson (e-mail: afin@bgs.ac.uk), British Geological Survey, Edinburgh, UK and Institute of Geography, University of Edinburgh, UK; Nick Golledge (e-mail: nick.golledge@vuw.ac.nz), Antarctic Research Centre, Victoria University of Wellington, New Zealand; Tom Bradwell (e-mail: tbrad@bgs.ac.uk), British Geological Survey, Edinburgh, UK; Derek Fabel (e-mail: Derek.Fabel@ges.gla.ac.uk ), Department of Geographical and Earth Sciences, University of Glasgow, UK.Reconstructions of palaeo-, or formerly more extensive, ice masses in northwest Europe have enabled inference of past glacier mass balance and climate, and allowed the causes of ice mass fluctuations to be assessed (e.g. Ballantyne 1989;Dahl & Nesje 1992;Carr 2001;Rea & Evans 2007;Golledge et al. 2009;Nesje 2009). In the Scottish Highlands, the last decade has seen a renewed focus of research into the extent and behaviour of ice masses during the Lateglacial Younger Dryas (YD), or Loch Lomond Stadial (Greenland Stadial 1 (GS-1)) (12.9 -11.7 cal. ka BP (Lowe et al. 2008))(e.g. Ballantyne 2002Ballantyne , 2007aBenn & Ballantyne 2005;Finlayson 2006;Golledge 2007;Lukas & Bradwell 2010). Key outcomes of this research have been the...

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“…2 Calculated according to Dunne et al (1999). Be half-life of 1.51 x 10 6 years (Yiou & Raisbeck 1972;Hofmann et al 1987;Inn et al 1987). ) was used to correct for the background.…”

Section: Discussionmentioning

confidence: 99%

Evolution of a Lateglacial mountain icecap in northern Scotland

Finlayson

Golledge

Bradwell

et al. 2011

Boreas

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“…Samples with codes ZB7429 to ZB7441 (see Table 1) were measured relative to the standard S555, with a determined 10 Be/ 9 Be ratio of 95.5×10 -12 that was compatible with the old 10 Be half-life of 1.51 Myr (Hofmann et al, 1987). After April 1 st , 2010, the Zuerich AMS lab introduced a new standard, S2007N, with a nominal value of 10 Be/Be = 28.1×10 -12 , that has been calibrated to ICN 01-5-1 (produced by K. Nishiizumi).…”

Section: A1 Details On Analytical Treatmentmentioning

confidence: 99%

The dependence of meteoric 10Be concentrations on particle size in Amazon River bed sediment and the extraction of reactive 10Be/9Be ratios

et al. 2012

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(2012): The dependence of meteoric 10Be concentrations on particle size in Amazon River bed sediment and the extraction of reactive 10Be/9Be ratios. AbstractConcentrations of meteoric 10 Be extracted from detrital Amazon river sediment are strongly particle size-dependent. Such grain size dependency presents a formidable obstacle to routine applications of meteoric cosmogenic 10 Be to basin-wide erosion studies. In this study, we explore means to eliminate these grain size effects in bedload from rivers of the Amazon basin by measuring 10 Be/ 9 Be ratios after selective chemical extraction of reactive authigenic phases. These phases mainly comprise FeMn(hydr)oxides that are the main carriers of 9 Be and 10 Be. We explore the distribution of 10 Be and its stable 9 Be counterpart between these phases and the partitioning of Be into remaining silicate fractions.This extraction procedure was carried out on bedload samples comprising the three main tectonic units of the Amazon basin, namely the Andes, the Guyana and Brazilian Shields, and the central Amazonian lowlands. For all samples, extracted 10 Be concentrations show a strong decrease with increasing particle size, with up to 20 times more 10 Be extracted from the finest analyzed (<30 μm) grain size when compared to the coarsest (90-125 μm) grain size. We attribute this decrease in 10 Be concentrations mostly to subsequent dilution by quartz in coarse bedload. However, when normalized to stable 9 Be concentrations that are also extracted from reactive phases, grain size effects are effectively removed

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“…Be was extracted from purified quartz using standard methods (von Blanckenburg et al, 1996;von Blanckenburg et al, 2004), 10 Be/ 9 Be ratios were measured in BeO targets with accelerator mass spectrometry at ETH Zurich relative to the standard S555 with a nominal value of 10 Be/ 9 Be = 95.5 ×10 -12 and corrected as described by Synal et al (1997), which is based on a 10 Be half life of 1.51 Myr (Hofmann et al, 1987). Between 150 and 300 µg of 9 Be carrier was added to each sample, which was determined to contain a 10 Be/ 9 Be ratio of 0.55 ± 0.28×10 -14 , except samples denoted by an asterisk in Table 1 that had a higher blank ratio.…”

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confidence: 99%

From source to sink: Preserving the cosmogenic 10Be-derived denudation rate signal of the Bolivian Andes in sediment of the Beni and Mamoré foreland basins

Wittmann

Blanckenburg

Guyot³

et al. 2009

Earth and Planetary Science Letters

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The denudation rate signal of the Bolivian Andes as measured by cosmogenic 10 Be in sediment is preserved in the floodplain of adjacent foreland basins even though these basins store the sediment for thousands of years. This conclusion is drawn from comparing published Andean source area denudation rates with new cosmogenic 10 Be data as measured in the floodplains of the large Beni and Mamoré basins. For the entire Beni basin including the sediment producing Andes and the vast flooded plains of the foreland, the cosmogenic nuclide-derived denudation rate is 0.45 ± 0.06 mm/yr, while that of the Mamoré basin is 0.55 ± 0.19 mm/yr. By comparison, the respective Andean source areas erode at averaged rates of 0.37 ± 0.06 mm/yr (upper Beni), and at 0.56 ± 0.09 mm/yr (upper Mamoré). We notice a decrease in variability of denudation rate with increasing spatial scale as small-scale processes are averaged out. Sediment mixing within the floodplain damps scatter of nuclide-derived denudation rates picked up in the source area. On the temporal scale, a remarkable agreement between cosmogenic nuclide-derived rates averaging over a few kiloyears with those from fission track dating averaging over millions of years seems to suggest that cosmogenic nuclide-derived denudation rates capture the long-term erosional characteristics of the mountain belt. The sum of these observations suggests that any sample collected along a river traversing a floodplain will yield the denudation rate of the source area. This finding opens the unique possibility of constraining cosmogenic nuclide-derived paleo-sediment budgets for these large basins as the long-term, spatially-averaged denudation rate signal of the sediment-producing area is preserved in sedimentary archives.

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10Be: Half-life and AMS-standards

Cited by 131 publications

References 6 publications

Evolution of a Lateglacial mountain icecap in northern Scotland

Evolution of a Lateglacial mountain icecap in northern Scotland

The dependence of meteoric 10Be concentrations on particle size in Amazon River bed sediment and the extraction of reactive 10Be/9Be ratios

From source to sink: Preserving the cosmogenic 10Be-derived denudation rate signal of the Bolivian Andes in sediment of the Beni and Mamoré foreland basins

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