ABSTRACT
The gold showings of Bleida are hosted in late Pan-African N45°E quartz-hematite-chlorite 1 tension veins that are related to the activity of major sinistral E-W thrusts. Native gold, together with native Bi, galena and a chlorite 2, occurs in microcracks offsetting the earlier minerals. Fluids evolved from C-O-H-N compositions with a saline component to boiling aqueous fluids. Pressure decreased from c. 50 MPa to les than 4 MPa, likely in an extensional setting. Temperature decreased from c. 300°C to c. 150°C. Thus, the gold showings of Bleida were formed in a typical geothermal (epithermal) setting, likely controlled by the late Pan-African magmatism.
