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Variability in erosion rates related to the state of landscape transience in the semi-arid Chilean Andes

Auteur(s) et Affiliation(s)

AGUILAR, G.
Dep. de Ciencias, Univ. Católica del Norte, Antofagasta, Chili
Lab. des Mécanismes et Transfert en Géologie, Univ., Toulouse, France
Dep. de Geología, Univ., Atacama, Chili
RIQUELME, R.
Dep. de Ciencias Geológicas, Univ. Católica del Norte, Antofagasta, Chili
MARTINOD, J.
Lab. des Mécanismes et Transfert en Géologie, Univ., Toulouse, France
DARROZES, J.
Lab. des Mécanismes et Transfert en Géologie, Univ., Toulouse, France
MAIRE, E.
Lab. Géographie de l'Environnement, Univ., Toulouse, France


Description :
The AA. quantify erosion rates in the higher sectors of the Huasco Valley using elevation differences between 3 successive geomorphic markers (pediments and paleo-valleys) and the present day valley. Available Ar-Ar ages of Neogene pediments are used to estimate mean erosion rates for the 3 periods (16 to 13 My, 13 o 8 My, and following 8 My). The landscape of the Huasco Valley is in a transient state, as indicated by well-preserved pediment surfaces in interfluves, valleys deeply incised by fluvial and glacial erosion and scarped head-valleys that represent the current knickzones. Quantitative data indicate that glaciers had a much higher erosional capability than fluvial activity in the higher sectors of the Main Cordillera. Comparison with erosion rates calculated in other drainage basins of the Chilean Andes suggests that the variability of erosion rates depends on the landscape's transient erosive state.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2011, vol. 36, n°. 13, p. 1736-1748, nombre de pages : 13, Références bibliographiques : 2 p.

Date :
2011

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

Langue :
Anglais
Droits :
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