Preparation of ASTER in-house 10Be/9Be standard solutions

Braucher, Régis; Guillou, V.; Bourlès, Didier; Arnold, Maurice; Aumaître, Georges; Keddadouche, Karim; Nottoli, Emmanuelle

doi:10.1016/j.nimb.2015.06.012

Cited by 118 publications

(142 citation statements)

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“…The protocol for taking 10 Be measurements (Brown et al, 1991;Merchel and Heppers, 1999;Arnold et al, 2010;Braucher et al, 2015;Chmeleff et al, 2010;Korschinek et al, 2010) is detailed in the Supplementary Information (Appendix A). The 10 Be production and derived erosion rates are calculated with a modified version of the code provided in Delunel et al (2010) (details in the Supplementary Information, Appendix B).…”

Section: Sampling and Resultsmentioning

confidence: 99%

Sidewall erosion: Insights from in situ‐produced ¹⁰Be concentrations measured on supraglacial clasts (Mont Blanc massif, France)

Sarr

Mugnier

Abrahami

et al. 2019

Earth Surf Processes Landf

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Sidewall erosion because of rockfalls is one of the most efficient erosional processes in the highest parts of mountain ranges; it is therefore important to quantify sidewall erosion to understand the long‐term evolution of mountainous topography. In this study, we analyse how the 10Be concentration of supraglacial debris can be used to quantify sidewall erosion in a glaciated catchment. We first analyse, in a glaciated catchment, the cascade of processes that move a rock from a rockwall to a supraglacial location and propose a quantitative estimate of the number of rockfalls statistically mixed in a supraglacial sand sample. This model incorporates the size of the rockwall, a power law distribution of the size of the rockfalls and the mean glacial transport velocity. In the case of the Bossons glacier catchment (Mont Blanc massif), the 10Be concentrations obtained for supraglacial samples vary from 1.97 ± 0.24 to 23.82 ± 1.68 × 104 atoms g−1. Our analysis suggests that part of the 10Be concentration dispersion is related to an insufficient number of amalgamated rockfalls that does not erase the stochastic nature of the sidewall erosion. In the latter case, the concentration of several collected samples is averaged to increase the number of statistically amalgamated rockfalls. Variable and robust 10Be‐derived rockwall retreat rates are obtained for three distinct rockfall zones in the Bossons catchment and are 0.19 ± 0.08 mm year−1, 0.54 ± 0.1 mm year−1 and 1.08 ± 0.17 mm year−1. The mean 10Be retreat rate for the whole catchment (ca. 0.65 mm year−1) is close to the present‐day erosion rate derived from other methods. © 2019 John Wiley & Sons, Ltd.

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Section: Sampling and Resultsmentioning

confidence: 99%

Sidewall erosion: Insights from in situ‐produced ¹⁰Be concentrations measured on supraglacial clasts (Mont Blanc massif, France)

Sarr

Mugnier

Abrahami

et al. 2019

Earth Surf Processes Landf

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“…The measured 10 Be/ 9 Be ratios (Table ) were normalized relative to the in‐house standard STD‐11 using an assigned 10 Be/ 9 Be ratio of 1.191±0.013×10 −11 (Braucher et al . ) and the Be half‐life of 1.387±0.01×10 6 years (Chmeleff et al . ; Korschinek et al .…”

Section: Methodsmentioning

confidence: 99%

Post‐Last Glacial Maximum glacier fluctuations in the southern Écrins massif (westernmost Alps): insights from ¹⁰Be cosmic ray exposure dating

Hofmann

Alexanderson

Schoeneich

et al. 2019

Boreas

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Only a few chronological constraints on Lateglacial and Early Holocene glacier variability in the westernmost Alps have hitherto been obtained. In this paper, moraines of two palaeoglaciers in the southern Écrins massif were mapped. The chronology of the stabilization of selected moraines was established through the use of 10Be cosmic ray exposure (CRE) dating. The equilibrium line altitude (ELA) during moraine deposition was reconstructed assuming an accumulation area ratio (AAR) of 0.67. Ten pre‐Little Ice Age (LIA) ice‐marginal positions of the Rougnoux palaeoglacier were identified and seven of these have been dated. The 10Be CRE age of a boulder on the lowermost sampled moraine indicates that the landform may have been first formed during a period of stable glaciers at around 16.2±1.7 ka (kiloyears before AD 2017) or that the sampled boulder experienced pre‐exposure to secondary cosmic radiation. The moraine was re‐occupied or, alternatively, shaped somewhat before 12.2±0.6 ka when the ELA was lowered by 230 m relative to the LIA ELA. At least six periods of stable ice margins occurred thereafter when the ELA was 220–160 m lower than during the LIA. The innermost dated moraine stabilized at or before 10.9±0.7 ka. Three 10Be CRE ages from a moraine of the Prelles palaeoglacier indicate a period of stationary ice margins at or before 10.9±0.6 ka when the ELA was lowered by 160 m with respect to the end of the LIA. The presented 10Be CRE ages are in good agreement with those of moraines that have been attributed to the Egesen stadial. Assuming unchanged precipitation, summer temperature in the southern Écrins massif at ~12 ka must have been at least 2 °C lower relative to the LIA.

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“…For the fine-grained fraction (50-100 µm), samples were left to decant for a few minutes (enough to let all particles fall to the bottom), then the supernatant was carefully removed. The pure quartz grains were then leached three times in HF to dissolve 30 % of the total weight of quartz and eliminate meteoric 10 Be contamination (Brown et al, 1991). We observed no systematic differences in HF leaching efficiency for either grain-size fractions.…”

Section: Sampling and 10 Be Analysesmentioning

confidence: 79%

“…Reported 10 Be concentrations have been corrected for analytical blanks (raw data are available in the Supplement). 10 Be/ 9 Be ratios were calibrated using the CEREGE STD11 in-house normalization (Braucher et al, 2015). Neutron production rates include paleomagnetic modulations over the integration time, which is why neutron production rates can be different for both grain sizes of the same sample (Charreau et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

“…All measured 10 Be/ 9 Be ratios were calibrated using the CEREGE STD11 in-house normalization, which is similar to the KNSTD07 normalization and assumes a 10 Be/ 9 Be ratio of (2.79 ± 0.03) × 10 −11 for the SRM4325 standard material (Braucher et al, 2015). Five and three chemical blanks were processed and measured during the 2016 and 2017 analytical sessions, respectively; the 2016 and 2017 blanks yielded 10 Be/ 9 Be ratios of (2.05±0.38)×10 −15 and (1.99±0.43)× 10 −15 , respectively.…”

Section: Sampling and 10 Be Analysesmentioning

confidence: 99%

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Denudation systematics inferred from in situ cosmogenic ¹⁰Be concentrations in fine (50–100 µm) and medium (100–250 µm) sediments of the Var River basin, southern French Alps

Mariotti¹,

Blard²,

Charreau³

et al. 2019

Earth Surf. Dynam.

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Marine sedimentary archives are well dated and often span several glacial cycles; cosmogenic 10 Be concentrations in their detrital quartz grains could thus offer the opportunity to reconstruct a wealth of past denudation rates. However, these archives often comprise sediments much finer (< 250 µm) than typically analyzed in 10 Be studies, and few studies have measured 10 Be concentrations in quartz grains smaller than 100 µm or assessed the impacts of mixing, grain size, and interannual variability on the 10 Be concentrations of such fine-grained sediments. Here, we analyzed the in situ cosmogenic 10 Be concentrations of quartz grains in the 50-100 and 100-250 µm size fractions of sediments from the Var basin (southern French Alps) to test the reliability of denudation rates derived from 10 Be analyses of fine sands. The Var basin has a short transfer zone and highly variable morphology, climate, and geology, and we test the impact of these parameters on the observed 10 Be concentrations. Both analyzed size fractions returned similar 10 Be concentrations in downstream locations, notably at the Var's outlet, where concentrations ranged from (4.02±0.78)×10 4 to (4.40±0.64)×10 4 atoms g −1 of quartz. By comparing expected and observed 10 Be concentrations at three major river junctions, we interpret that sediment mixing is efficient throughout the Var basin. We resampled four key locations 1 year later, and despite variable climatic parameters during that period, interannual 10 Be concentrations were in agreement within uncertainties, except for one upper subbasin. The 10 Be-derived denudation rates of Var subbasins range from 0.10 ± 0.01 to 0.57 ± 0.09 mm yr −1 , and spatial variations are primarily controlled by the average subbasin slope. The integrated denudation rate of the entire Var basin is 0.24 ± 0.04 mm yr −1 , in agreement with other methods. Our results demonstrate that fine-grained sediments (50-250 µm) may return accurate denudation rates and are thus potentially suitable targets for future 10 Be applications, such as studies of paleo-denudation rates using offshore sediments.Published by Copernicus Publications on behalf of the European Geosciences Union. 1060 A. Mariotti et al.: Denudation systematics inferred from in situ cosmogenic 10 Be concentrations

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Preparation of ASTER in-house 10Be/9Be standard solutions

Cited by 118 publications

References 10 publications

Sidewall erosion: Insights from in situ‐produced ¹⁰Be concentrations measured on supraglacial clasts (Mont Blanc massif, France)

Sidewall erosion: Insights from in situ‐produced ¹⁰Be concentrations measured on supraglacial clasts (Mont Blanc massif, France)

Post‐Last Glacial Maximum glacier fluctuations in the southern Écrins massif (westernmost Alps): insights from ¹⁰Be cosmic ray exposure dating

Denudation systematics inferred from in situ cosmogenic ¹⁰Be concentrations in fine (50–100 µm) and medium (100–250 µm) sediments of the Var River basin, southern French Alps

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Preparation of ASTER in-house 10Be/9Be standard solutions

Cited by 118 publications

References 10 publications

Sidewall erosion: Insights from in situ‐produced 10Be concentrations measured on supraglacial clasts (Mont Blanc massif, France)

Sidewall erosion: Insights from in situ‐produced 10Be concentrations measured on supraglacial clasts (Mont Blanc massif, France)

Post‐Last Glacial Maximum glacier fluctuations in the southern Écrins massif (westernmost Alps): insights from 10Be cosmic ray exposure dating

Denudation systematics inferred from in situ cosmogenic 10Be concentrations in fine (50–100 µm) and medium (100–250 µm) sediments of the Var River basin, southern French Alps

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Resources

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Sidewall erosion: Insights from in situ‐produced ¹⁰Be concentrations measured on supraglacial clasts (Mont Blanc massif, France)

Sidewall erosion: Insights from in situ‐produced ¹⁰Be concentrations measured on supraglacial clasts (Mont Blanc massif, France)

Post‐Last Glacial Maximum glacier fluctuations in the southern Écrins massif (westernmost Alps): insights from ¹⁰Be cosmic ray exposure dating

Denudation systematics inferred from in situ cosmogenic ¹⁰Be concentrations in fine (50–100 µm) and medium (100–250 µm) sediments of the Var River basin, southern French Alps