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(Article of periodic en Anglais - 2011)

Document title

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

Authors(s) and Affiliation(s)

AGUILAR G. (1 2 3) ; RIQUELME R. (4) ; MARTINOD J. (2) ; DARROZES J. (2) ; MAIRE E. (5) ;
(1) Dep. de Ciencias, Univ. Católica del Norte, Antofagasta, CHILI
(2) Lab. des Mécanismes et Transfert en Géologie, Univ., Toulouse, FRANCE
(3) Dep. de Geología, Univ., Atacama, CHILI
(4) Dep. de Ciencias Geológicas, Univ. Católica del Norte, Antofagasta, CHILI
(5) Lab. Géographie de l'Environnement, Univ., Toulouse, FRANCE

Abstract

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

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2011, vol. 36, no13 [pp. 1736-1748]

Bibliographic references : 2 p.

Collation : 10 fig., 2 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.2194

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2012
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