Intrusion of shoshonitic magmas at shallow crustal depth: T–P path, H2O estimates, and AFC modeling of the Middle Triassic Predazzo Intrusive Complex (Southern Alps, Italy)

The multi-pulse shoshonitic Predazzo intrusive complex represents an ideal igneous laboratory for investigating the chemical\ud and physical conditions of magma emplacement in a crustal context, since numerical models can be constrained by\ud field evidence. It constitutes the most intriguing remnant of the Middle Triassic magmatic systems of the Dolomitic Area\ud (Southern Alps), preserved by the Alpine tectonics. Predazzo Intrusive Complex comprises silica saturated (pyroxenites/\ud gabbros to syenites), silica undersaturated (gabbros to syenites), and silica oversaturated (granites and syenogranites) rock\ud suites. In this paper, we modeled its emplacement and evolution with a multiple thermo-/oxy-barometric, hygrometric, and\ud EC-AFC approach. At odds with what proposed in literature but according to the field evidence, the emplacement of the\ud Predazzo Intrusive Complex occurred at shallow depth (