PUXEDDU ~-. (1978): Some observations on the age and genesis of the sulphide deposiu within the "Boccheggiano...te rocks and Ferruginous Horizons in the Venucano in Southern Tuscany, Paleoenvironmental and Paleogegra•...associated with porphiry plutons, II, General features and origin in : Advances in the geology of the porphiry...sulfates f ~ the Massive Pyrite Deposits of Niccioleta and assocll!ted country rocks, Southern Tuscany, Italy...M., LATTANZI P., TANELLI G., (1984): Mineralogy and environment of formation of the Cu, Pb, Zn, (Ag,