Periadriatische Magmatische Provinz

Rappresentazione e statuto

Varianti storiche: Periadriatic Magmatic Province (TK500 / Gouffon et al. 2024)

Unità di rango inferiore

Geomorfologia

Età alla base

Termini generici

Tipo di origine

Revisione: Gouffon Yves (Editor) (2024) : Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern

p.118: Plutons and many dykes of Eocene–Oligocene age straddle the Periadriatic Fault System; the final emplacement of the plutons often coincides temporally with activity along this fault system. As pointed out by Rosenberg (2004), magmas were channeled from the base of the thickened continental crust into the narrow mylonitic belt of the Periadriatic Fault System, which was used as an ascent pathway with vertical lengths of 20 to 40 km.
As concerns the generation of magma and its ascent across the crust, von Blanckenburg & Davies (1995) proposed that rapid lateral migration of slab break-off within the S-dipping European plate resulted in a linear trace of magmatism in local thermally weakened crust. This would explain why most of these magmatic rocks intruded almost synchronously along the Periadriatic Fault System between Biella (Piemonte, Italy) and Slovenia. This hypothesis was recently challenged by Müntener et al. (2021) who proposed that the calc-alkaline magmatism with a lithospheric mantle component, ending at around 28 Ma, reflects deep-seated processes other than slab break-off, e. g., volatile fluxing of the Alpine mantle wedge during the final stages of continental subduction that immediately followed Europe-Adria collision between 43 and 34 Ma.