CARBON AND OXYGEN ISOTOPIC COMPOSITION OF ACCESSORY CARBONATES FROM SALIFEROUS DEPOSITS OF THE PRIPYAT FLEXURE

Accessory carbonates are characterized by the <<lighter>> isotopic com position (delta C-13(m)==-6.8 parts per thousand, delta O-18(m)=21.8 p arts per thousand). The obtained values of delta O-18 are related to b oth the inversion behaviour of oxygen isotopes in concentrated brines, and variations of the carbonate crystallization temperatures during s edimentation and catagenesis. The model crystallization temperatures h ave been calculated from the delta O-18 values. The carbon isotopic co mposition is interpreted proceeding from the effect of heterogenous so urces of CO2, nonequilibrium processes of the carbonate formation, and , possibly, their temperature regime.