Fig. 4

Petrographic characterisation of the main lithologies in the studied area. UTM coordinates for each photograph are given. a Typical field aspect of the Aroletta amphibole-bearing granite (374861/5083365). A magmatic foliation is defined by the shape preferred orientation of K-feldspar and amphibole. A mafic microgranular enclaves is elongated parallel to the magmatic fabric. b Foliated Aroletta amphibole-bearing granite, characterised by centimetre-scale recrystallized K-feldspar (347996/5083519). c Migmatitic biotite-gneiss (375160/5082825) showing coarse-grained leucocratic layers made of quartz and feldspar (leucosomes), bordered by narrow biotite-rich selvedges (melanosomes). d Garnet-muscovite bearing pegmatite, parallel to the migmatitic layering and displaying cm-size garnet crystals (375416/5082788). e Coarse-grained leucosome consisting of clinopyroxene crystals rimmed by amphibole, plagioclase and quartz in a partially melted amphibolite (374739/5082534). f Mont Morion biotite-bearing granite cut by a composite dyke (375523/5082870). The dyke displays an anastomosing net of felsic veins, which enclose lenses of finer-grained mafic material