R. Soto Marín, J. Martinod, Rodrigo Riquelme, Gérard Hérail, Laurence Audin
We study the recent tectonic activity in a sector of the Precordillera in the Andean forearc analysing aerial photographs, satellite images and fieldwork data. The interpretation of alluvial landforms, drainage organisation and evolution o f intermittent river networks downcutting post-Miocene deposits allow us to recognize tectonic processes. All these geomorphic markers indicate no strike-slip offsets, but successive and small tectonic pulses that reactivate previous structures originated under a transpressive context. The observed deformational pattern could be related to the small tilting of the Chilean forearc coinciding with an important episode of uplift of the Altiplano-Puna.
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