 Incapillo is part of a volcanic system active between 3 @.@ 5 and 2 mya that includes Ojos del Salado and Nevado Tres Cruces . It was the last volcanic centre formed in the region ; subsequently , the <unk> of the subducting slab prevented volcanism east and south of it . Another volcanic trend considers Incapillo as part of a northeast – southwest trend with Cerro Galan and Cerro Blanco . This trend may be related to delamination of the lower crust . Also , these centres are located between two domains of different rigidity , an Ordovician sedimentary domain of low rigidity and a higher rigidity basement . 
