1. How does the Nazca Ridge subduction influence the modern Amazonian foreland basin?
- Author
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Espurt, N., Baby, P., Brusset, S., Roddaz, M., Hermoza, W., Regard, V., Antoine, P.-O., Salas-Gismondi, R., and Bolanos, R.
- Subjects
Amazon River region -- Environmental aspects ,Peru -- Environmental aspects ,Subduction zones (Geology) -- Observations ,Plate tectonics -- Research ,Earth sciences - Abstract
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. Keywords: Nazca Ridge, Amazonian foreland basin, Neogene, flat subduction, Fitzcarrald arch.
- Published
- 2007