PHYSICAL AND CHEMICAL CONDITIONS OF FORMA TION OF THE MASSIVE SULFIDEORE-DEPOSITS OF THE VERKHNEURALSKY ORE AREA, SOUTHERN URALS

Fluid inclusion studies of the minerals of ores and altered country ro cks of the Verhne-uralsky ore area showed the following mineral format ion parameters: homogenisation temperature range of 370-110-degrees-C, the pressure of 1-0,5 kbar and the salinity in the interval of 0,8-11 ,2 (rarely up to 22,8) wt.% NaCl equiv. Four solution types are distin gushed by the temperature eutectic melting. Lateral temperature zoning in the altered rocks was established including the maximal temperatur es in zones of ore transport and temperature decrease at the flanks. E vidences of hydrothermal solution boiling were revealed in the underly ing rocks. The observed homogenisation temperatures in the ores are no t connected with the composition but reflect the diagenetic and epigen etic transformation of ores. The differences of the hydrothermal solut ions of studied deposits in relation to modern hydrothermal sulfide be aring solutions at the sea bottom are shown.