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

Cruz Nunes, Fábio; Delunel, Romain; Schlunegger, Fritz; Akçar, Naki; Kubik, Peter W. (2015). Bedrock bedding, landsliding and erosional budgets in the Central European Alps. Terra nova, 27(5), pp. 370-378. Blackwell Scientific Publications 10.1111/ter.12169

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We explore the controls of the litho-tectonic architecture on the erosional flux in the 370-km2 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-km2 deep-seated Lumnezia landslide), the opposite non-dip slope side of the valley hosts >100-m-deeply incised tributary streams. 10Be concentrations of stream sediments yield catchment-averaged denudation rates that vary between 0.27 ± 0.03 and 2.19 ± 0.37 mm a−1, while the spatially averaged denudation rate of the entire basin is 1.99 ± 0.34 mm a−1. Our 10Be-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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Exogenous Geology

UniBE Contributor:

Delunel, Romain; Schlunegger, Fritz and Akçar, Naki

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0954-4879

Publisher:

Blackwell Scientific Publications

Language:

English

Submitter:

Romain Delunel

Date Deposited:

29 Jul 2015 16:12

Last Modified:

26 Jun 2016 02:06

Publisher DOI:

10.1111/ter.12169

URI:

https://boris.unibe.ch/id/eprint/70556

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