Espurt Nicolas auteur aut IRD Baby Patrice auteur aut IRD Brusset Stéphane auteur aut IRD Roddaz M. auteur aut IRD Hermoza W. auteur aut IRD Regard V. auteur aut IRD Antoine P. O. auteur aut IRD Salas Gismondi R. auteur aut IRD Bolanos R. auteur aut IRD text journalArticle eng The subduction of an aseismic ridge has important consequences on the dynamics of the overriding upper plate. In the central Andes, the Nazca Ridge subduction imprint can be tracked on the eastern side of the Andes. The Fitzcarrald arch is the long-wavelength topography response of the Nazca Ridge flat subduction, 750 km inboard of the trench. This uplift is responsible for the atypical three-dimensional shape of the Amazonian forelland basin. The Fitzearrald arch uplift is no older than Pliocene as constrained by the study of Neogene sediments and geomorphic markers, according to the kinematics of the Nazca Ridge subduction. specialized Nazca Ridge Amazonian foreland basin Neogene flat subduction Fitzcarrald arch 066 35 6 515-518 2007 0091-7613 https://www.documentation.ird.fr/hor/PAR00001801 10.1130/G23237A.1 0091-7613 https://www.documentation.ird.fr/hor/PAR00001801 IRD - Base Horizon / Pleins textes 2007-10-11 2017-08-23 PAR00001801 fre