CLAY MINERALS OF MIOCENE EVAPORITES OF THE CARPATHIAN REGION, UKRAINE

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CLAY MINERALS OF MIOCENE EVAPORITES OF THE CARPATHIAN REGION, UKRAINE

Journal Title: Biuletyn Państwowego Instytutu Geologicznego - Year 2012, Vol 449, Issue 449

Abstract

Based on previously published XRD and DTA-TG data, the clay mineral assemblages composition of water-insoluble residue of Miocene evaporites of the Ukrainian Carpathian region is presented. Data on the composition of pelitic fraction minerals were obtained from studies of Egerian–Eggenburgian and Badenian evaporites of the Carpathian Foredeep, namely gypsum, rock salt and potash salts of the Stebnyk and Kalush-Holyn’ deposits, and rock salt from the Transcarpathian Trough. In the gypsum facies, the clay minerals are mainly allogenic and are represented by dioctahedral smectite, illite and chlorite, while authigenic minerals such as trioctahedral smectite and illite are present in minor amounts. Clay minerals of rock salt facies are represented by illite, chlorite and mixed-layer illite-smectite in Egerian–Eggenburgian rock salt. In Badenian rock salt, smectite, corrensite and mixed-layer chlorite-smectite are also present. In potash facies deposits, only illite and chlorite occur. The degree of transformation of clay minerals depends upon basin brine concentration. As the brine concentration increases, the mineral assemblage changes towards vanishing of swelling clay minerals. Volcanic activity had also a great impact on clay minerals composition – pyroclastic material alteration resulted in the occurrence of smectite, corrensite and mixed-layer chlorite-smectite in the Badenian rock salt.

Authors and Affiliations

Petro BILONIZHKA, Iaroslava IAREMCHUK, Sophiya HRYNIV, Serhiy VOVNYUK

Keywords

EP ID EP64512
DOI -
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