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| Titel |
Low 10Be concentrations in geomorphic studies: Problems, strategies, and examples |
| VerfasserIn |
Sara Savi, Stefanie Tofelde, Hella Wittmann, Steven Binnie, Stefan Heinze, Taylor Schildgen |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250124686
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| Publikation (Nr.) |
 EGU/EGU2016-4163.pdf |
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| Zusammenfassung |
| In the last two decades, the use of in situ cosmogenic nuclides for the quantification of
exogenic processes and the determination of exposure ages of landforms has seen a fast and
broad expansion. Among the group of terrestrial cosmogenic nuclides that can be used to
study geomorphic processes (e.g. 10Be, 26Al, 36Cl, 3He, 21Ne and 22Ne), in situ-produced
10Be is the most widely used, especially for the quantification of denudation rates. However,
there are a number of problematic issues related to the use of cosmogenic nuclide techniques
in rapidly evolving landscapes because of the typically low 10Be abundancies. The
difficulties encountered in these settings are mainly related to (1) the mass of clean
quartz that can be obtained and thus the total amount of 10Be available, and (2) the
backgrounds of the sample preparation and measurement processes. In order to improve
measurements in these circumstances, a series of steps can be taken into consideration
during field work and sample preparation to help improve the final results. We
discuss the quality of the blanks, blank corrections, and the limits of detection of the
technique in the specific case of low concentration samples. Based on a number of
different synthetic scenarios, we demonstrate the importance of blank corrections
and utility of determination limits, and we highlight how these parameters may
affect the reliability and meaningfulness of the results. This information in turn
helps to illustrate how low-concentration data should be interpreted and reported. |
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