Magmatic Processes at Euganean Hills (Veneto Volcanic Province, Italy): Clinopyroxene Investigation to Unravel Magmatic Interactions

The Euganean Hills (NE Italy) magmatic district represents the final volcanic activity of Veneto Volcanic Province. Alkaline to subalkaline suite dominated by intermediate felsic rocks characterises latest Hills. Magmatic (intrusive and volcanic) enclaves are common in trachytes. We used ability clinopyroxene record variations P, T, fO2 reconstruct geological history trachytic host. Despite similar major trace elements composition, from host is higher Ca Na (and Fe3+) lower Mg than slightly enriched but with same pattern distribution. Minor differences geochemistry crystal structure suggest parental magmas that differs small degrees fractional crystallisation. Clinopyroxene geobarometry performed combining X-ray diffraction mineral for enclaves–trachytic combined amphibole intrusive mushes points a crystallisation pressure range between 4.8–2.0 kbars. Our data support model complex system magma chambers at shallow crustal level where mafic accumulated, evolved fractionation processes mixed.