Effects of sediment mixing on 10Be concentrations in the Zielbach catchment, central-eastern Italian Alps

Savi, Sara; Norton, Kevin; Picotti, Vincenzo; Brardinoni, Francesco; Akçar, Naki; Kubik, Peter W.; Delunel, Romain; Schlunegger, Fritz

doi:10.1016/j.quageo.2013.01.006

Cited by 36 publications

(62 citation statements)

References 33 publications

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“…The Zielbach catchment can be divided into two distinct subbasins based on the main mechanism of sediment transfer (Savi et al, 2014a). In particular, a debris flow tributary is located in the southeastern margin of the basin and covers an area of ca.…”

Section: Introductionmentioning

confidence: 99%

“…0.5 mm/year (variance of 0.02). Individual samples show a positive correlation between denudation rates and elevation, which is considered as the effect of the incorporation of soils with higher cosmogenic concentrations (Savi et al, 2014a). A direct influence of past glacial conditions on the denudation rates within the Zielbach catchment was excluded because of the short integration time derived from the 10 Be analyses (calculations indicate that all the samples have reached a cosmogenic steady state within 2 ka from deglaciation).…”

Section: Introductionmentioning

confidence: 99%

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Efficiency of frost-cracking processes through space and time: An example from the eastern Italian Alps

2015

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficiency of frost-cracking processes through space and time: An example from the eastern Italian Alps

2015

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“…Then pressed into AMS target holder being mixed with Nb powder. [19]. Topographic aspects such as latitude, longitude and the mean elevation of sites in the catchment were determined from a digital elevation model (DEM) with 5 m resolution.…”

Section: Concentration Inmentioning

confidence: 99%

“…In recent years, observation of the 10 Be concentration relationship has been widely used to derive geomorphologic processes in a catchment regarding the influence of landslide processes in mountainous environments [19][20][21]. In this study, we present a new data set of 10 Be concentrations in river sediments sampled along the Sangun river and one sample on the hillslopes.…”

Section: Be Concentrations In An Upper Stream Of Sangun Catchmentmentioning

confidence: 99%

Relationships between of Sediment Concentrations from 10Be Analysis and Morphometric Aspect in Sangun Catchment Area, Fukuoka Prefecture, Japan

Pachri¹,

Mitani²,

Nakanishi³

et al. 2016

JGRE

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Abstract:Recently, the contributions of slope failures have been difficult to quantify over the time scales of the sediment concentrations in Sangun catchment area, Fukuoka Prefecture. Therefore, to clarify the sources of the sediment mixing in the catchment is important and becomes considering in the future that related the slope failures occurrence. This paper describes how cosmogenic nuclide methods have provided information about the geomorphic process by utilizing 10 Be (half-life = 1.5 ma), measuring the 10 Be/ 9 Be ratio, and quantifying 10Be concentration. The sampled sediments were derived from throughout a drainage basin. To measure the 10 Be/ 9 Be ratios in the sediments, quartz minerals were collected from the sediment and then Be was extracted from the quartz. The 10 Be/ 9 Be ratios were measured by AMS. We assume that the cosmogenic nuclide concentrations stored in the sediment of a river can increase or decrease, depending on the amount of mixing of sediments during transport through the fluvial system. As results, the 10 Be concentrations have been calculated to determine the short term sediment mixing rate in the catchment area. Therefore, the relationship between the morphometrics of the drainage basin, the sediment concentration by 10 Be analysis and the contribution of landslides to landscape changes over timescales of several years have been investigated in Sangun catchment area.

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“…These studies explore, for example, landscapes that are not in erosional steadystate, e.g. due to recent glaciation (Wittmann et al, 2007), settings where different rock types do not contribute quartz equally (Safran et al, 2005;Torres Acosta et al, 2015), and environments prone to mass failures or with 15 non-uniform sediment supply (Niemi et al, 2005;Binnie et al, 2006;Yanites et al, 2009;Kober et al, 2012;McPhillips et al, 2014;Savi et al, 2014;Schildgen et al, 2016). It is particularly challenging to apply these techniques in environments where the cosmogenic nuclide content is low.…”

Section: Introductionmentioning

confidence: 99%

Determination limits for cosmogenic <sup>10</sup>Be and their importance for geomorphic applications

Savi

Tofelde

Wittmann

et al. 2017

Preprint

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Abstract. When using cosmogenic nuclides to determine exposure ages or denudation rates in rapidly evolving landscapes, challenges arise related to the small number of nuclides that have accumulated in surface materials.Improvements in accelerator mass spectrometry have enabled analysis of samples with low 10 Be content (<10 5 atoms), such that it is timely to discuss how technical limits of nuclide determination, effects of laboratory cleanliness, and overall sample preparation quality affect lower blank limits. Here we describe an approach that 5 defines a lower threshold above which samples with low 10 Be content can be statistically distinguished from laboratory blanks. In general, this threshold depends on the chosen confidence interval. In detail, however, we show that depending on which ensemble of blank values and which approach is chosen for the calculation of this threshold, significant differences can arise with respect to when a sample can be distinguished from a blank. This in turn dictates whether the sample can be used to determine an exposure age or a denudation rate, or when it only 10 constrains a maximum age or a minimum denudation rate. Based on a dataset of 57 samples and 61 blank measurements obtained in one laboratory, we demonstrate how these different approaches may influence the interpretation of the data.

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Effects of sediment mixing on 10Be concentrations in the Zielbach catchment, central-eastern Italian Alps

Cited by 36 publications

References 33 publications

Efficiency of frost-cracking processes through space and time: An example from the eastern Italian Alps

Efficiency of frost-cracking processes through space and time: An example from the eastern Italian Alps

Relationships between of Sediment Concentrations from 10Be Analysis and Morphometric Aspect in Sangun Catchment Area, Fukuoka Prefecture, Japan

Determination limits for cosmogenic <sup>10</sup>Be and their importance for geomorphic applications

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Effects of sediment mixing on 10Be concentrations in the Zielbach catchment, central-eastern Italian Alps

Cited by 36 publications

References 33 publications

Efficiency of frost-cracking processes through space and time: An example from the eastern Italian Alps

Efficiency of frost-cracking processes through space and time: An example from the eastern Italian Alps

Relationships between of Sediment Concentrations from 10Be Analysis and Morphometric Aspect in Sangun Catchment Area, Fukuoka Prefecture, Japan

Determination limits for cosmogenic &lt;sup&gt;10&lt;/sup&gt;Be and their importance for geomorphic applications

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Determination limits for cosmogenic <sup>10</sup>Be and their importance for geomorphic applications