Caracterización de la cinemática y cálculo de paleo-tensores de esfuerzo para el conjunto principal de fallas en el Valle de Aburrá, implicaciones tectónicas

Abstract

The tectonic evolution and the opening process of the Aburrá Valley, has been studied and discussed for several decades -- However, the factors and the kinematics that led to the opening of this depression are still under debate -- Recent studies suggests that the configuration of the Aburrá Valley is product of the movement of fault systems along the basin margins, displacement of blocks towards their axial zone, and formation of a "pull- apart" basin -- Nevertheless, to date, a concrete kinematic model for its evolution and development have not been developed -- The present work, through a population análisis of faults and fault-slip inversion using the right-dihedra method, proposes that the Aburrá Valley was formed as a pull-apart basin inside a right-lateral shear zone, product of a main stress tensor acting NE-SW