A Middle Miocene (13.5-12Â Ma) deformational event constrained by volcanism along the Puna-Eastern Cordillera border, NW Argentina

The different relationships between the Miocene Angastaco Formation and the ignimbrites with ages of ca. 13.5 and ca. 12 Ma reveal that in this short period (~ 1.5 m.y.) a significant deformation event took place and resulted in marked palaeogeographic changes, as evidenced by stratigraphic-sedimentological and chronological records in the Angastaco Formation.