Niviere B., Messager G., Carretier Sébastien, Lacan P. (2013). Geomorphic expression of the southern Central Andes forebulge (37 degrees S, Argentina). Terra Nova, 25 (5), p. 361-367. ISSN 0954-4879.
Titre du document
Geomorphic expression of the southern Central Andes forebulge (37 degrees S, Argentina)
Niviere B., Messager G., Carretier Sébastien, Lacan P.
Source
Terra Nova, 2013,
25 (5), p. 361-367 ISSN 0954-4879
Abstract We present a geomorphologic analysis of an east-west transect located east of the southern Andes of Argentina (~37 degrees S). We observe a succession of zones that underwent erosion and deposition during the Pleistocene. If the proximal Andean foothills are incised, a proximal depozone receives sediments feeding the megafan of the Rio Colorado on the Chadileuvu plain. More distally, the abandoned palaeo-valleys and bending of the valley floors reflect a localized uplift. Further to the east, another depozone corresponds to the Pampa Deprimida lowland. This pattern is consistent with the presence of a classical flexural geometry of the lithosphere. The distal uplift of the foreland corresponds in terms of location, length (150 km) and amplitude (240 m) to the Andean forebulge modelled by a geophysical approach. In this study, we identify the morphological imprint of this bulge and show its effect on the fluvial activity.
