Nouveau modèle tectono-climatiquedes Andes Centrales du Nord (5-9°S)

Abstract : Using a multidisciplinary approach, this thesis proposes a new double-verging orogen model for the Northern Central Andes, which can explain the crustal thickening and the current topography interacting with a complex climate. A new structural and stratigraphic synthesis across the forearc and the Western Cordillera revealed the presence of a major western vergence thrust. For the first time, the construction of a balanced cross-section through the whole Northern Central Andes, combined with thermochronological data, illustrates a double verging orogenic model propagating synchronously since ~30 Ma, with a total shortening of 158 km. Numerical modeling of the tectono-climatic evolution of the Andean orogeny shows the acceleration of the aridification in its western flank at ~ 15 Ma and during the Pliocene, as well as the late uplift and the formation of an equivalent of the Altiplano, which would have been incised and emptied recently by the Marañón River.
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Alice Prudhomme. Nouveau modèle tectono-climatiquedes Andes Centrales du Nord (5-9°S). Sciences de la Terre. Université de Toulouse III – Paul Sabatier, 2019. Français. ⟨tel-02297894⟩

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