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Erosion of an active fault scarp leads to drainage capture in the Amazon region, Brazil

Auteur(s) et Affiliation(s)

VAL, P.
Dept. of Earth Sciences, Univ., Syracuse, Etats-Unis
SILVA, C.
Federal univ. of Amazonas (UFAM), Geosciences Dept., Manaus, Bresil
HARBOR, D.
Washington and Lee Univ., Geology Dept., Lexington, Etats-Unis
MORALES, N.
São Paulo State univ., UNESP, Rio Claro, Bresil
AMARAL, F.
Federal univ. of Amazonas (UFAM), Geosciences Dept., Manaus, Bresil
MAIA, T.
Federal univ. of Amazonas (UFAM), Geosciences Dept., Manaus, Bresil


Description :
This paper evaluates the timing of geomorphic change by examining a drainage capture event across the Baependi fault scarp involving the Cuieiras and Tarumã-Mirim River basins northwest of the city of Manaus in Brazil. A system of capture-related knickpoints was generated by base-level fall following drainage capture; through numerical modeling of their initiation and propagation, the capture event is inferred to have occurred between the middle and late Pleistocene, consistent with other studies of landscape change in surrounding areas. In low-slope settings like the Amazon River basin, base-level fall can increase erosion rates by more than an order of magnitude, and moderate to large river basins can respond to episodes of base-level fall over timescales of tens to hundreds of thousands of years.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2014, vol. 39, n°. 8, p. 1062-1074, nombre de pages : 13, Références bibliographiques : 2 p.

Date :
2014

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

Langue :
Anglais
Droits :
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