Tag: Krosno zone

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ON THE QUESTION OF THE INFLUENCE OF MIGRATING FLUIDS ON THE FORMATION CONDITIONS OF VEIN MINERALS OF THE UKRAINIAN CARPATHIANS

Home > Archive > No. 2 (202) 2026 > 98–110

Geology & Geochemistry of Combustible Minerals No. 2 (202) 2026, 98–110

ISSN 0869-0774 (Print), ISSN 2786-8621 (Online)

https://doi.org/10.15407/ggcm2026.202.098

Dina HOLOVCHENKO

State institution “Scientific Center of Mining Geology, Geoecology and infrastructure development of National Academy of Sciences of Ukraine”, Kyiv, Ukraine

e-mail: dinka666999@gmail.com, https://orcid.org/0009-0004-6206-6651

Abstract

Research on fluid migration, particularly hydrocarbon fluids, in various geological structures of Ukraine is one of the leading directions for determining their influence on the development and genesis of mineral deposits. The formation of vein mineral complexes is one of the indicators of post-formational processes of fluid transfer of matter and mechanisms of fracture healing in sedimentary rocks, and it is characteristic of the terrigenous flysch deposits of the Dukla and Krosno structural-facial units of the Ukrainian Carpathians. The formation of mineral veins represented by calcite and quartz, including the “Marmarosh diamonds” type, in the deposits of the region’s flysch formation during the Oligocene-Miocene period was influenced by regional fluid-dynamic processes. The formation of several generations of secondary inclusions in “Marmarosh diamonds” indicates that the transverse Rakhiv-Tysia deep fault, within the zone of influence of which the studied veins are located, developed under conditions of periodic stress release, resulting in the formation of fault dislocations. Considering the cyclical (stage-by-stage) process of filling fault dislocations with mineral matter, quartz crystals formed during the final stages of the vein structure development within the zone of influence of the Rakhiv-Tysia transverse deep fault. The results obtained allow for the determination of specific local and regional mineral formation trends characteristic of the Krosno and Dukla structural-tectonic zones. The data obtained from complex precision studies should be applied as a prospecting criterion for hydrocarbon accumulations within the region.

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Keywords

vein minerals, fluid inclusions, hydrocarbons, Krosno zone, Dukla nappe, Rakhiv-Tysia deep fault, Ukrainian Carpathians

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Received: April 24, 2026
Accepted: May 11, 2026
Published: May 29, 2026

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NON-ORE MINERALS OF VEINLET-IMPREGNATED MINERALIZATION IN THE DEPOSITS OF THE KROSNO ZONE OF THE UKRAINIAN CARPATHIANS (district of the new Beskydy railway tunnel)

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.

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Keywords

veinlet-impregnated mineralization, calcite, “Marmarosh diamonds”, new Beskydy railway tunnel, Krosno zone, Ukrainian Carpathians

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