Fig. 9

(a) Quartz vein associated with a tectonic structure. (b) Quartz (Qz) with iron oxides. (c) Gossan (Go) in an altered outcrop. (d) calcite veins deformed by tectonic structures. (e) Manganese (Mn) mineralization in a rock cavity. (f) Calcite vein crosscut by a tectonic fracture.