1 COMPARISION OF CRYSTALLIZATION TEMPERATURES OF MINERALS BASED ON ISOTOPIC DATA AND FLUIDE INCLUSIONS

The sulfur and oxygen isotopic data obtained for the ore minerals are permanently used for the es-tablishment of fluid sources and ore deposition temperature estimates. Sulfide-sulfate pair is mostly productive as its isotopic fractionation coefficient is widely variable at high temperatures [1]. This fac-tor was firstly applied for the ore deposit studies in [2, 3]. Here we report the results of isotopic (S,O) and fluid inclusion (FI) studies of sulfate-sulfide-quartz assemblages in base metal and Pb-Zn ore deposits (Levikha [4], Darasun [5], Zuzel'ga. Aleksandrin-skoye). These deposits are characterized by the regular distribution of sulfur isotopic composition points of pyrite and anhydrite on δ34S – ∆34S diagram. This indicates that the isotopic fractionation of sulfur isotopes within fluids and above mentioned mineral phases could be interpreted as an equilib-rium high temperature fractionation process within 550- 2500 C temperature range. This diagram al-lowed estimating the pyrite and anhydrite temperatures as well as total δ34S value of the fluid sulfur and ratio SO2-4/H2S. The isotopic composition of the ore forming fluid total sulfur is corresponding to δ34S value determined as the intersection point of δ34S of anhydrite and sulfide regression lines. The ratio of oxidized and reduced sulfur forms is evaluated by the inclination angles of sulfide and anhy-drite lines in respect of total sulfur line. These values are widely variable in different ore deposits. So the values of δ34S of fluid total sulfur for Leviha are estimated as +0, 6‰; SO2-4 /H2S- 15/85, T- 520