Bedrock bedding, landsliding and erosional budgets in the Central European Alps

We explore the controls of the litho-tectonic architecture on the erosional flux in the 370-km(2) Glogn basin (European Alps). In this basin, the bedding and schistosity of the bedrock dip parallel to the topographic slope on the NW valley flank, leading to a non-dip slope situation on the opposite SE valley side. While the dip slope condition has promoted the occurrence of landslides (e.g. the c. 30-km(2) deep-seated Lumnezia landslide), the opposite non-dip slope side of the valley hosts >100-m-deeply incised tributary streams. Be-10 concentrations of stream sediments yield catchment-averaged denudation rates that vary between 0.27 +/- 0.03 and 2.19 +/- 0.37mma(-1), while the spatially averaged denudation rate of the entire basin is 1.99 +/- 0.34mma(-1). Our Be-10-based approach reveals that the Lumnezia landslide front contributes c. 30-65% of the entire sediment budget, although it covers <5% of the Glogn basin. This suggests a primary control of the bedrock bedding on erosion rates and processes.