A spectacular example of intrusive magmatism is well-exposed at Bussaglia beach, just 2 km north of Porto on the western coast of Corsica. There, dark and fine-grained dykes intruded into a reddish, coarse-grained granite. These magmatic rocks are part of the so-called Porto Complex, which is well-known for its magma-mingling features.
The granite contains pink alkali feldspar, plagioclase, quartz, biotite and hornblende. It crystallized ca. 300 Ma ago. Such granites are typical for the Variscan U2 magmatic stage. The red granite hosts several steep dykes of a dark rock that are usually several meters thick. The dark dykes are approximately of basaltic composition: The rock consists of a fine-grained groundmass of mafic minerals and larger, isolated bright porphyric feldspar crystals, which is called a microlithic texture. The basaltic dykes were dated to ca. 280 Ma and are therefore attributed to the U3 magmatic stage. The contacts between dykes and host granite are straight and sharp, which shows that the granite had already cooled when the dykes intruded.