LaVasca

We present geochemical, isotopic, and geochronological data from the LVAC and the surrounding area. The metaluminous rocks are monzonite and syenite with post-collisional geochemical affinity and Middle Eocene zircon ages between 47.6 ±0.3 Ma and 45.4 ±0.3 Ma that are significantly older than other alkaline rocks from the EMAP. The peralkaline rocks are composed of syenite and eudialyte-bearing foid-syenite with intraplate geochemical affinity that probably coevolved with the metaluminous rocks. Both groups show minimal crustal contamination, with affinity to an Ocean Island Basalt mantle source.