Neogene magmatic expansion and mountain building processes in the southern Central Andes, 36-37°S, Argentina

► New ages Ar/Ar ages of 14.8 ± 2.8 Ma and 14.51 ± 0.12 Ma. ► Miocene volcanic rocks were formed under low pressure conditions. ► Magmatic eastward migration associates with crustal thickening. ► Building episode was achieved in Late Cretaceous, followed by a Late Miocene one. ► Magmatic expanded in a north-east trend, with a clear attenuation of the arc signal.