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1 Na tional Acad emy of Sci ences of Ukraine, In sti tute of Ge ol ogy and Geo chem is try of Com bus ti ble Min er als, Naukowa 3A, 79060 Lviv, Ukraine 34 S is +21.4 ± 0.3‰. Those val ues are sim i lar to those of the Neo gene ma rine sulphates. Com par i son to other geo chem ical data (chem i cal com po si tion of the brine con tained in fluid in clu sions and the bro mine con tent in ha lite) sug gests that the Badenian Carpathian Foredeep evaporite ba sin was sup plied pre dom i nately by sea wa ter sol utes where, at dif fer ent stages of salt ac cu mu la tion, the in flu ence of con ti nen tal wa ters with lighter iso to pic com po si tions of dis solved sul phate was im portant. The iso to pic com po si tion of sul phur (d 34 S) of Badenian sea wa ter, cal cu lated on the ba sis of sixty anal y ses of anhydrite re lated to ha lite of the Carpathian re gion, is ap prox i mately +20.3‰, this value be ing sim i lar to the sul phur iso to pic com po sition of pres ent-day sea wa ter. The d 34 S value for Badenian sea wa ter may have been slightly higher if we con sider po ten tial changes of the brine com po si tion of salt-bear ing bas ins caused by in flow of con ti nen tal wa ters en riched in light 32 S iso topes.

Fluid inclusions in halite are widely used in research to determine the conditions of sedimentation in salt basins and reconstruct the chemical composition of seawater during a specific geological period. However, previous preliminary studies of the genetic types of inclusions, considered in the present research project, have not received due attention. Consequently, we decided to take into account the main distinguishing features of fluid inclusions in halite, belonging to various genetic types. The ultramicrochemical analysis (UMCA) method is one of the several methods that are used for the quantitative determination of the chemical composition of the primary fluid inclusions in halite. We have upgraded that technique, and that allowed us to reduce the analytical error rates of each component determination. The error rates were calculated in the study of Ca-rich and SO4-rich types of natural sedimentary brines.