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Influence de la subduction d'une ride asismique sur la dynamique de la plaque continentale chevauchante: exemple de la ride de Nazca et du bassin amazonien

Abstract : The Nazca ridge subduction is recorded in the eastern side of the Peruvian Andes. Its topographic response is the Fitzcarrald Arch, which induces the foredeep-foreslope-foredeep N-S partitioning of the Amazonian foreland system. Using lithospheric analogue models we evidence that horizontal subduction: i) requires the subduction of hundreds of kilometers of buoyant oceanic plateau; ii) increases the interplate friction and iii) induces uplift in the retro-lithosphere as a consequence of shortening and ridge underplating. In the Fitzcarrald Arch, the structural framework consists of two superimposed thrust-wedges. The lower wedge consists in the reactivation of a carboniferous thrust-wedge. The upper wedge is deformed by thin-skinned thrust tectonics. The structural evolution is controlled by the thickness of the paleozoic sedimentary pile involved in the thrust system. It is marked by a transfer-zone located at the northern border of a paleozoic basin. Apatite fission track analysis (AFT) allows us to determine an exhumation stage around 110 Ma linked to the opening of the South Atlantic Ocean. Since ~6Ma, AFT recorded the thrust propagation in the Camisea South of the transfer zone, where apatite thermochronometers have been reset. However, the underplating of the Nazca ridge had no influence on the short wavelength deformation of the Subandes.
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Submitted on : Tuesday, January 15, 2008 - 12:09:52 PM
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Nicolas Espurt. Influence de la subduction d'une ride asismique sur la dynamique de la plaque continentale chevauchante: exemple de la ride de Nazca et du bassin amazonien. Géologie appliquée. Université Paul Sabatier - Toulouse III, 2007. Français. ⟨tel-00204692⟩

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