GEOCHEMISTRY OF FLUORINE OF SEDIMENTARY ROCKS OF DIFFERENT MASSES OF THE CARPATIAN BIOSPHERE RESERVE

Abstract

Carbonate rocks of the territory of the Carpathian Biosphere Reserve (limestones, dolomites, marls) were studied — their mineral composition, carbonation and fluorine content were determined. The average fluorine content was calculated — in limestones (0.038%), dolomites (0.056%), marls (0.06%). It has been proven that an increase in clay mineral impurities in carbonate rocks will contribute to an increase in the total fluorine content. The maximum fluorine content of 0.18% was recorded in the clay fraction (<0.001 mm) of the marl of the Chornohirsky massif, the minimum — 0.08% in the clay fraction of the limestone of the Marmara massif. The results of the obtained research made it possible to establish that the content of fluorine in carbonate rocks is inversely correlated with the degree of carbonation. It has been proven that the increase in the fluorine content in carbonate rocks occurs in the following sequence: limestone-dolomite-marl. According to the kinetic curves of the fluorine content in water extracts, equilibrium with the solid phase was established: sandstone and limestone — after 3 hours, marl — after 8.5 hours. This is explained by the presence of a clay component — about 70% in marl, as a result of which fluorine enters the solution very slowly. The study of the desorption processes of fluorine by sediments has applied aspects: geological — to find out the ways and scales of dispersion and accumulation of fluorine in the process of sedimentation; nature protection – for the development of the environmental monitoring system, with the aim of assessing the ecological state of the environmental objects of the protected territories, which is the Carpathian Biosphere Reserve.