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Geomorphic expression of the southern Central Andes forebulge (37°S, Argentina)

AuthorsNivière, B.; Messager, G.; Carretier, S.; Lacan, Pierre
Issue Date2013
PublisherBlackwell Publishing
CitationTerra Nova 25: 361- 367 (2013)
AbstractWe present a geomorphologic analysis of an east-west transect located east of the southern Andes of Argentina (~37°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 Chadileuvú 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. © 2013 John Wiley & Sons Ltd.
Publisher version (URL)http://dx.doi.org/10.1111/ter.12044
Identifiersdoi: 10.1111/ter.12044
issn: 0954-4879
Appears in Collections:(Geo3Bcn) Artículos
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