Long-wavelength subsidence in the Andean broken foreland: Sublithospheric controls on the sedimentation and topography of the Sierras Pampeanas?

FEDERICO MIGUEL DAVILA; JORDAN, T. E.; ASTINI, R. A.

Barcelona

Congreso; International Symposium on Andean Geodynamics; 2005

In the Central Andes, supracrustal tectonic loading has been extensively used for explaining retroarc flexure and foreland basin subsidence. Very few works have considered sublithospheric controls. In this work, we present surface and subsurface stratigraphy (thickness and distribution) in the Sierras Pampeanas broken foreland (Argentina) suggesting a long-wavelength subsidence pattern, likely driven by processes occurring in upper mantle or lower crust, which overlapped to short-wavelength, local deformation.