GNGTS 2016 - Atti del 35° Convegno Nazionale

GNGTS 2016 S essione 1.2 227 crustal breakup and the formation of the oceanic crust. The model also includes the hydration of the uprising mantle peridotite and the extension rate is constant and fixed to 1.25 cm/yr on the both sides of the domain (total extension rate of 2.5 cm/yr). Accounting for two different thermal configurations of the lithosphere allows to constrain two different pre-rifting settings of the Alpine lithosphere (hot and cold simulations with 1600 K isotherm at 80 and 220 km depth respectively). The model results in a symmetric rifting of the continental lithosphere and shows the exhumation of a serpentinized lithospheric mantle (ocean-continent transition zone – OCTZ). The onset of the lithospheric thinning strongly depends on the initial lithospheric Fig. 2 – Duration of the agreement between the predictions and the natural data as well as number of fitting markers (colors) in terms of lithological affinity and coincident P–T values compared to the radiometric (black thick segments) and geologic (grey thick segments) ages of the natural data. Panel (a) refers to the hot simulations, whereas panel (b) refers to the cold one. The labels are defined in Fig. 1.