The contribution of landslides to the Quaternary evolution of relief is poorly documented in arid contexts. In southern Peru and northern Chile, several massive landslides disrupt the arid western Andean front. The Chuquibamba landslide, located in southern Peru, belongs to this set of large landslides. In this area, the Incapuquio fault system captures the intermittent drainage network and localizes rotational landslides. Seismic activity is significant in this region with recurrent Mw 9 subduction earthquakes; however, none of the latest seismic events have triggered a major landslide. New terrestrial cosmogenic dating of the Chuquibamba landslide provides evidence that the last major gravitational mobilization of these rotational landslide deposits occurred at ~ 102 ka, during the Ouki wet climatic event identified on the Altiplano between 120 and 98 ka. Our results suggest that wet e...

El levantamiento y la exhumación de la Cordillera Blanca están vinculados a la falla normal de la Cordillera Blanca (CBNF), esta estructura tectónica regional delimita y da forma al flanco occidental del batolito de la Cordillera Blanca. Dos modelos han sido propuestos anteriormente para explicar la presencia de esta falla normal activa en un contexto en compresión (Dalmayrac and Molnar, 1981; McNulty and Farber, 2002), pero hoy, la falla normal de la Cordillera Blanca y la exhumación asociada de la Cordillera Blanca permanecen como procesos geológicos poco conocidos. Estudios recientes (e.g. Margirier et al., 2016) sugieren un aumento en las tasas de exhumación durante el Cuaternario en la Cordillera Blanca y relacionan este aumento con un cambio en el clima y/o proceso erosivo dominante (erosión glacial vs. erosión fluvial). La intrusión de Cordillera Blanca se ha erosionado ...

Thermochronological data are essential to constrain thermal and exhumation histories in active mountain ranges. In the Central Andes, bedrock outcrops are rare, being blanketed by widespread late Palaeogene–Neogene and younger volcanic formations. For this reason, the exhumation history of the Western Cordillera (WC) in the Peruvian Andes has only been investigated locally along the mountain range. Dense thermochronological data are only available in canyons of the Arequipa (16° S) and Cordillera Negra regions (10° S). We present new apatite (U-Th)/He and fission-track data from the 1 km deep Cañete Canyon (13° S), where the Oligo-Miocene deposits are preserved lying conformably on an Eocene palaeo-topographic surface. Thermal modelling of thermochronological data indicate that the 30–20 Ma ignimbrite deposits overlying the bedrock were thick enough to cause burial rehe...