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Cosmogenic nuclide-derived rates of diffusive and episodic erosion in the glacially sculpted upper Rhone Valley, Swiss Alps

Auteur(s) et Affiliation(s)

NORTON, K.P.
Inst. for Mineraloy, Leibniz Univ., Hannover, Allemagne
Inst. for Mineraloy, Leibniz Univ., Hannover, Allemagne
KUBIK, P.W.
Lab. for Ion Beam Physics, ETH, Zurich, Suisse


Description :
Morphometric data indicate 2 distinct erosion processes operate in these steep mountain valleys. The AA. determined the rates of these processes using cosmogenic beryllium-10 (10Be) in pooled soil and stream sediment samples. Denudation in deep, glacially scoured valleys is characterized by rapid, non-uniform processes, such as debris flows and rock falls. The denudation rate in each basin represents a binary mixture between the rapid, non-uniform processes, and soil creep. The AA. further show that the spatially averaged denudation rate is that of the local rock uplift value, even though a bedrock knickzone at the valley outlet hinders baselevel lowering and thereby disconnects the valley from the regional rock uplift trends.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2010, vol. 35, n°. 6, p. 651-662, nombre de pages : 12, Références bibliographiques : 1,5 p.

Date :
2010

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
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