Rocce subcrostali nella zona d'Ivrea (Italia): I "Corpi minori" della Val Strona".

Besides the main peridotitic massifs (from SW to NE: Baldissero, Balmuccia and Finero), in The Ivrea Zone other “minor” ultramafic lenses occur completely embedded in the metamorphic Kinzigitic Formation. They are mainly located in the Strona valley. The Alpe Francesca, Alpe Piumero and Alpe Crotta define a discontinuous horizon in correspondence of the shear zone, which characterizes the transition, in the Kinzigitic Formation, from the amphibolite to the granulite facies.The Alpe Morello is the stratigraphically highest massif in Strona valley.It occurs at the boundary between the Ivrea Zone and the Serie dei Laghi unit.The petrological and geochemical characterization of all these occurrence of subcrustal rocks is here presented.