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(Article of periodic en Anglais - 2011)

Document title

Erosion rates and mechanisms of knickzone retreat inferred from 10Be measured across strong climate gradients on the northern and central Andes Western Escarpment

Authors(s) and Affiliation(s)

ABBÜHL L.M. (1) ; NORTON K.P. (1) ; JANSEN J.D. (2) ; SCHLUNEGGER F. (1) ; ALDAHAN A. (3 4) ; POSSNERT G. (5) ;
(1) Inst. of Geological Sciences, Univ., Bern, SUISSE
(2) Dep. of Physical Geography and Quaternary Geology, Univ., Stockholm, SUEDE
(3) Dep. of Earth Sciences, Univ., Uppsala, SUEDE
(4) Dep. of Geology, Univ., Al Ain, EMIRATS ARABES UNIS
(5) Tandem Lab., Univ., Uppsala, SUEDE

Abstract

A steep escarpment edge, deep gorges and distinct knickzones in river profiles characterize the landscape on the Western Escarpment of the Andes between 5°S and 18°S (northern Peru to northern Chile). Strong north-south and east-west precipitation gradients are exploited in order to determine how climate affects denudation rates in 3 river basins. It is found that the Tertiary units on the plateau function as cap-rocks, which aid in the parallel retreat of the sharp escarpment edge and upper knickzone tips. 10Be concentrations in fluvial sediments suggest that climate exerts significant control on denudation rates and hillslope morphology. Since escarpment retreat and the precipitation pattern were established at least in the Miocene, it is speculated that the present-day distribution of morphology and denudation rates has probably remained largely unchanged during the past several millions of years as the knickzones have propagated headward into the plateau

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, no11 [pp. 1464-1473]

Bibliographic references : 2 p.

Collation : 6 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.2164

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