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Earth Surface Dynamics An interactive open-access journal of the European Geosciences Union

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doi:10.5194/esurf-2016-57
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
01 Dec 2016
Review status
A revision of this discussion paper was accepted for the journal Earth Surface Dynamics (ESurf) and is expected to appear here in due course.
Constraining Quaternary erosion of the Campine Plateau (NE Belgium) using Bayesian inversion of an in-situ produced 10Be concentration depth profile
Koen Beerten1, Eric Laloy1, Veerle Vanacker2, Bart Rogiers1, and Laurent Wouters3 1Institute Environment-Health-Safety, Belgian Nuclear Research Centre (SCK•CEN), Mol, 2400, Belgium
2Georges Lemaitre Centre for Earth and Climate Research, Earth and Life Institute, Université catholique de Louvain, Louvain-la-Neuve, 1348, Belgium
3Long-term RD&D department, Belgian National Agency for Radioactive Waste and enriched Fissile Material (ONDRAF/NIRAS), Brussels, 1210, Belgium
Abstract. The rate at which low-lying sandy areas in temperate regions, such as the Campine area (NE Belgium), have been eroding during the Quaternary is a matter of debate. Current knowledge on the average pace of landscape evolution in the Campine area is largely based on geological inferences and modern analogies. We applied Bayesian inversion to an in-situ produced 10Be concentration depth profile in fluvial sand, sampled on top of the Campine Plateau, and inferred the average long-term erosion rate together with three other parameters, i.e., the surface exposure age, inherited 10Be concentration and sediment bulk density. The inferred erosion rate of 44 ± 9 mm/kyr (1σ) is relatively large in comparison with landforms that erode under comparable (palaeo-)climates elsewhere in the world. We evaluate this value in the light of the erodibility of the substrate and sudden base level lowering during the Middle Pleistocene. A denser sampling scheme of a two-nuclide concentration depth profile would allow to include more parameters in the model inversion and further reduce their uncertainty.

Citation: Beerten, K., Laloy, E., Vanacker, V., Rogiers, B., and Wouters, L.: Constraining Quaternary erosion of the Campine Plateau (NE Belgium) using Bayesian inversion of an in-situ produced 10Be concentration depth profile, Earth Surf. Dynam. Discuss., doi:10.5194/esurf-2016-57, in review, 2016.
Koen Beerten et al.
Koen Beerten et al.
Koen Beerten et al.

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Short summary
Over very long timescales, 100.000 yrs and more, landscapes may drastically change. Sediments preserved in these landscapes have a cosmogenic radionuclide inventory that tell us when and how fast such changes took place. In this paper, we provide first evidence of elevated long-term erosion rates in the Campine area (lowland Europe). They seem to be related to the loose and unconsolidated nature of the subsoil, and the sudden base level lowering in the wider region during the Middle Pleistocene.
Over very long timescales, 100.000 yrs and more, landscapes may drastically change. Sediments...
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