The G 2 blocks vary from a few square meters to a few hundred square meters and are cut by dikes of a Neoproterozoic G 3 Brasiliano granite.
Feldspars show both a grain-shape fabric and biotite, a pervasive foliation.
These features indicate syn-tectonic injection of granites during a major thrusting episode. Country-rock remnants of G 1 tonalitic gneisses and amphibolites exhibit strong assimilation. The analyzed sample was collected from a large xenolith with 100 m 2 of exposed area in the quarry face, surrounded by a G 3 Brasiliano intrusive phase. For the same reason, the sample was collected about 1 m from the sharp contact with the enclosing G 3 dike-like Brasiliano granite. Hornblende may become the only mafic accessory close to remnants of assimilated amphibolites in schlieren domains.