(Article of periodic en Anglais - 2014)

Document title

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

Authors(s) and Affiliation(s)

VAL P. (1) ; SILVA C. (2) ; HARBOR D. (3) ; MORALES N. (4) ; AMARAL F. (2) ; MAIA T. (2) ;
(1) Dept. of Earth Sciences, Univ., Syracuse, ETATS-UNIS
(2) Federal univ. of Amazonas (UFAM), Geosciences Dept., Manaus, BRESIL
(3) Washington and Lee Univ., Geology Dept., Lexington, ETATS-UNIS
(4) São Paulo State univ., UNESP, Rio Claro, BRESIL


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


Article of periodic

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

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

Millesime : 2014, vol. 39, no8 [pp. 1062-1074]

Bibliographic references : 2 p.

Collation : 9 fig.



INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3507

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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