Articles | Volume 7, issue 4
https://doi.org/10.5194/esurf-7-1059-2019
https://doi.org/10.5194/esurf-7-1059-2019
Research article
 | 
13 Dec 2019
Research article |  | 13 Dec 2019

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

Apolline Mariotti, Pierre-Henri Blard, Julien Charreau, Carole Petit, Stéphane Molliex, and the ASTER Team

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Cited articles

Aguilar, G., Carretier, S., Regard, V., Vassallo, R., Riquelme, R., and Martinod, P.: Grain size-dependent 10Be concentrations in alluvial stream sediment of the Huasco Valley, a semi-arid Andes region, Quat. Geochronol., 19, 163–172, https://doi.org/10.1016/j.quageo.2013.01.011, 2014. 
Anthony, E. J. and Julian, M.: Source-to-sink sediment transfers, environmental engineering and hazard mitigation in the steep Var River catchment, French Riviera, southeastern France, Geomorphology, 31, 337–354, https://doi.org/10.1016/S0169-555X(99)00088-4, 1999. 
Attal, M., Mudd, S. M., Hurst, M. D., Weinman, B., Yoo, K., and Naylor, M.: Impact of change in erosion rate and landscape steepness on hillslope and fluvial sediments grain size in the Feather River basin (Sierra Nevada, California), Earth Surf. Dynam., 3, 201–222, https://doi.org/10.5194/esurf-3-201-2015, 2015. 
Bekaddour, T., Schlunegger, F., Vogel, H., Delunel, R., Norton, K. P., Akçar, N., and Kubik, P. W.: Paleo erosion rates and climate shifts recorded by Quaternary cut-and-fill sequences in the Pisco valley, central Peru, Earth Planet. Sc. Lett., 390, 103–115, https://doi.org/10.1016/j.epsl.2013.12.048, 2014. 
Belmont, P., Pazzaglia, F. J., and Gosse, J. C.: Cosmogenic 10Be as a tracer for hillslope and channel sediment dynamics in the Clearwater River, western Washington State, Earth Planet. Sc. Lett., 264, 123–135, https://doi.org/10.1016/j.epsl.2007.09.013, 2007. 
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This work is the first assessment of the suitability of the in situ 10Be method to determine denudation rates from fine (50–100 μm) detrital quartz at the watershed scale. This method is used worldwide to determine denudation rates from sandy sediments (250 μm-1 mm). We show that in the Var catchment fine-grained sediments (50–100 μm) are suited to the 10Be method, which is vital for future applications of 10Be in sedimentary archives such as offshore sediments.