The roadcuts between Belgodere and Occhiatana offer a nice view into a partially molten level of the deep Variscan orogenic crust.
Next to the bridge ca. 500 m southeast of Occhiatana, large roadcuts expose an assemblage of migmatites intruded by granitoids. The latter contain quartz and plagioclase, lots of large K-feldspar crystals and are also rich in biotite (and possibly hornblende). This mineralogy indicates that the magma was rich in K and Mg, which is typical for the U1 magmatic stage of Variscan Corsica, dated to 338 Ma (Paquette et al. 2003; cited after Rossi et al. 2009).
The migmatites belong to the metasedimentary "Belgodere basement". They show the typical separation of the protolith, a mesocratic paleosome, to the lighter-colored leucosome and a darker-colored restite (or melanosome). The protolith is a rather fine-grained paragneiss rich in biotite and feldspar that could have been derived from a sequence of immature sediments. The leucosome mostly consists of feldspar and quartz, whereas the restite is very rich in biotite and potentially other mafic minerals like hornblende.
In some areas, the granitoid seems to contain rafts of the migmatite components, indicating that it intruded into the anatectic paragneiss.