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Geology; June 2007; v. 35; no. 6; p. 515-518; DOI: 10.1130/G23237A.1
© 2007 Geological Society of America
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How does the Nazca Ridge subduction influence the modern Amazonian foreland basin?

N. Espurt*,1, P. Baby*,1, S. Brusset*,2, M. Roddaz*,2, W. Hermoza*,3, V. Regard*,4, P.-O. Antoine*,4, R. Salas-Gismondi*,5 and R. Bolaños*,6

1 LMTG, Université de Toulouse, CNRS, IRD, OMP, 14 Avenue Edouard Belin, F-31400 Toulouse, France, and IRD, Convenio IRD-PERUPETRO, Calle Teruel 357, Miraflores, Lima 18, Peru
2 LMTG, Université de Toulouse, CNRS, IRD, OMP, 14 Avenue Edouard Belin, F-31400 Toulouse, France
3 PERUPETRO, Convenio IRD-PERUPETRO, Avenida Luis Aldana 320, San Boja, Lima 41, Peru
4 LMTG, Université de Toulouse, CNRS, IRD, OMP, 14 Avenue Edouard Belin, F-31400 Toulouse, France
5 Museo de Historia Natural—UNMSM, Departamento de Paleontología de Vertebrados, Avenida Arenales 1256, Lima 14, Peru
6 PERUPETRO, Convenio IRD-PERUPETRO, Avenida Luis Aldana 320, San Boja, Lima 41, Peru

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 foreland basin. The Fitzcarrald 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.

Key Words: Nazca Ridge • Amazonian foreland basin • Neogene • flat subduction • Fitzcarrald arch






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