Active deformation, uplift and subsidence in southern South America throughout the Quaternary: a general review about their development and mechanisms.

ANDRES FOLGUERA; GUIDO GIANNI; LUCIA SAGRIPANTI; EMILIO ROJAS VERA

Marine Isotope Stage 3 (60-30 ka BP.) in southern South America (Argentina, Uruguay and Brazil). In Gasparini et al. (Eds).

SPRINGER

Año: 2018; p. 1 - 20

Abstract A broad range of processes act today and have acted simultaneouslyduring the Quaternary, producing relief from the Chilean coast, where the PacificOcean floor is sinking underneath the South American margin, to the Brazilian andArgentine Atlantic Ocean platform area. This picture shows to be complex andresponds to a variety of processes which are just started to be considered. Theseprocesses involve mountains created in a passive margin setting along vast sectionsof the Brazilian Atlantic Ocean coast and regions located inland, to ?current?orogenic processes along the Andean zone. On one hand, mountains in the passivemargin seem to be created in the area where the forearc region eastwardly shifts at asimilar rate than the westward advancing continent and, therefore, it can be consideredas relatively stationary and dynamically sustained by a perpendicularto-the-margin asthenospheric flow. On the other hand, the orogenic processesassociated with the eastern Andes show to be highly active at two particular areas:the Subandean region, where the trench is stationary and the Pampean flat sub-