THE IMPACT OF INHERITED CRUSTAL FEATURES ON THE EVOLUTION OF THE SOUTHERN CENTRAL ANDES: INSIGHTS FROM NUMERICAL MODELING

BARRIONUEVO, M.; LIU, S.; MESCUA, J.F.; YAGUPSKY, D.; QUINTEROS, J.; GIAMBIAGI, L.; SOBOLEV, S.; RODRÍGUEZ PICEDA, C. ; STRECKER, M.

Puerto Madryn

Congreso; XXI Congreso Geológico Argentino; 2022

Asociación Geológica Argentina y UNPSJB

The non-collisional Southern Central Andes show a latitudinal variation in structural patterns, wheresecond-order variations in the localization and amount of shortening occur between 33º and 36ºS. However, the origin of this structural diversity is still not clear. It has been proposed that besides subduction dynamics, the strength of the upper plate imposes an important control on deformation styles of the mountain belt (i.e., Ramos et al. 2004, Oncken et al. 2006). We focus on a segment where subduction parameters (i.e., slab dip of ~30º, age of the subducting oceanic plate, plate-velocity, and climate) are similar throughout the tectonic province; thus, possible e ects due to variations of subduction-related parameters can be neglected. The modeling setup and con guration were thus designed to simulate inherited lithospheric-scale anisotropies from previous deformation events, which, we argue, play a pivotal role in guiding deformation.