Tectonic history of a non-accreting margin during the past 400 ka. Results of a submersible survey of the Peru Trench at 5-6°S

Creators: Bourgois, Jacques; Lagabrielle, Yves; de Wever, Patrick; Suess, Erwin; Aquilina, Luc; Chotin, Pierre; Dia, Aline; Duperret, Anne; Fiala-Médioni, Aline; Foucher, Jean-Paul; Fourcade, Éric; Harmegnies, François; Juteau, Thierry; Machare, José; Mercier de Lépinay, Bernard; Michaud, François; Monge, Félix; Sosson, Marc; von Breymann, Marta; von Huene, Roland

Others:: Laboratoire de tectonique (LT) ; Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Cergy Pontoise (UCP) ; Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS); Université de Brest (UBO); Université Pierre et Marie Curie - Paris 6 (UPMC); Christian-Albrechts-Universität zu Kiel = Christian-Albrechts University of Kiel = Université Christian-Albrechts de Kiel (CAU); Laboratoire de Géochimie et Métallogénie ; Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS); Observatoire océanologique de Banyuls (OOB) ; Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS); Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER); Institut Français d'Etudes Andines (IFEA) ; Ministère de l'Europe et des Affaires étrangères (MEAE)-Centre National de la Recherche Scientifique (CNRS); Université de Nice Sophia-Antipolis (UNSA); Instituto Geofísico del Perú (IGP); Helmholtz Centre for Ocean Research [Kiel] (GEOMAR)

Description

The late Pleistocene tectonic history of the northern Peru convergent margin can be retraced using data collected during deep-sea dives of the submersible Nautile combined with a recent Hydrosweep survey conducted off Peru at lat 5°-6°S by the R/V Sonne. During the past 400 ka, a broad rollover fold formed in the middle slope area, in association with a major seaward-dipping detachment fault. A catastrophic debris avalanche occurred as the result of oversteepening of the landward flank of the rollover fold. The gravity failure of the slope, previously recognized by SeaBeam mapping, occurred at 13.8 ±2.7 ka and produced a destructive tsunami.

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Tectonic history of a non-accreting margin during the past 400 ka. Results of a submersible survey of the Peru Trench at 5-6°S

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