| Popis: |
In northern Chile, four magmatic arc systems, each displaced towards the east in relation to the previous one, developed in sequence since the Lias. This migration of the magmatic arc from the Coastal Cordillera to the Western Cordillera probably was a consequence of tectonic erosion of the continental margin. Within each of these systems, tectonic deformation took place contemporaneously to magmatic activity. As the continental crust of the upper plate has been weakened in the area of the magmatic arc by the igneous processes, it is relatively sensitive to the stresses introduced by plate convergence. A very important factor for the deformation in the magmatic arc is the angle of convergence obliqueness which may cause shortening if obliqueness is small ( |
