Home > Archive > No. 1–2 (187–188) 2022 > 103–114
Geology & Geochemistry of Combustible Minerals No. 1–2 (187–188) 2022, 103–114.
https://doi.org/10.15407/ggcm2022.01-02.103
Ihor NAUMKO1, Halyna ZANKOVYCH1, Oksana KOКHAN1, Olexandеr VOVK2, Yaroslav KUZEMKO1, Bohdan SAКHNO1, Roman SERKIZ3
1 Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, Ukraine, e-mail: igggk@mail.lviv.ua
2 Lesya Ukrainka Volyn National University, Lutsk, Ukraine, е-mail: geologygeochemistry@gmail.com
3 Ivan Franko National University of Lviv, Lviv, Ukraine, е-mail: rserkiz@gmail.com
Abstract
The construction of the new Beskydy railway tunnel, which revealed the indigenous deposits of the Krosno formation of the Ukrainian Carpathians, provided an opportunity to obtain new results from the study of another prospective oil and gas-bearing areas of the flysch formation within the Krosno structural-facies unit. There is a second tunnel in length in Ukraine and passes under the Verkhovyna watershed ridge of the Ukrainian Carpathians. Its section is represented by the rocks of the Krosno formation, namely the stratification of sandstones, argillites and silt stones. There are two fracture zones have been indentified here, in which developed veinle-impregnated mineralization of ore (sulfides) and non-ore (calcite and quartz type of the “Marmarosh diamonds”) minerals. Calcite and quartz formas monominerals veins and in paragenesis calcite-quartz type of the “Marmarosh diamonds” ‒ sulfides. Quartz occurs in the form of splice sand well-faceted crystals, transparent, in yellow, brown, black, green colour. Calcite of a milky, translucent colour in the form of veins, veinlets, impregnation, powder on quartz, druz. Contains significant impurities of magnesium, manganese and iron which means the presence of a rhodochrosite-magnesite-siderite component. Hydrocarbon fluids are present in all calcite and quartz crystals of the “Marmarosh diamonds” type. By chemical composition, it is methane with impurities of higher hydrocarbons (up to hexane). Sometimes the manifestations of the outflow of a black substance with the smell of oil from the cracks in the veinlet-impregnated mineralization are recorded studied rock complexes of the flysch formation of the Krosno zone of the Ukrainian Carpathians (construction area of the new branch of the Beskydy railway tunnel), which acquires an important genetic significance.
Keywords
veinlet-impregnated mineralization, calcite, “Marmarosh diamonds”, new Beskydy railway tunnel, Krosno zone, Ukrainian Carpathians
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