Key outcrop features of amphibole-chlorite shear zones developing in metagabbros (locations in Fig. 2, along the D80 Cap Corse Road. The precise latitude and longitude are respectively 42.867808°and 9.349849°). A/. Meter scale characteristic examples of amphibole-chlorite shear zones cross-cutting foliated metagabbros (near D80 road). Shear zones (in black) are marked by strongly deformed schists (cleavage in white) with sigmoid shape constraining the top to NE sense of shear (black arrows). The thickness of these shear zones is variable, from cm- to pluri- meters. Colorful symbols indicate sample location. B/ Close-up picture showing the sharp contact between massive metagabbros, schists and clasts of metagabbros and serpentinite within the shear zone. C/ and D/ Hand sample microphotographs of metagabbro and schists, respectively. E/ Close up picture showing the contact between a serpentinite clast, schists and massive metagabbros.