ДЕФОРМАЦІЙНІ СТРУКТУРИ В ЗОНАХ РОЗВИТКУ ЗРУЙНОВАНИХ ФОРМАЦІЙ ТА МЕЛАНЖІВ ЗОВНІШНІХ УКРАЇНСЬКИХ КАРПАТ

Abstract

Purpose. The purpose of the work is to characterize exposed small deformation structures associated with broken formations and mélange zones, and an attempt to clarify their genesis. Method. The research methodology is based on elements of structural analysis, the description of deformation structures was given in accordance with the characteristics of similar structures in works [7-9]. Results. In the studied outcrops of the Ukrainian Outer Carpathians, some mesostructural forms developed in zones of distribution of tectonic melange and broken formations are characterized, including small folds, bends of layers, boudins, duplexes, as well as tectonic foliation. The transition from broken-formation to tectonic monomictic melange is described. Two types of this melange are considered, the first of which was formed in the zone of brittle deformations, and the second – during ductile deformations of the melange matrix. Scientific novelty. The characteristics of small deformation forms of broken formations and melanges have been supplemented. Within broken formations, sandstones retain sedimentary textures, and siltstones and mudstones are tectonically foliated mainly without preserving primary sedimentary textures. Disharmonic sinusoidal folds are described, the formation of which is associated with the active buckling mechanism; as well as monomic mélanges of both brittle and plastic types. Practical significance. The results obtained will be important for the construction of geological maps and will complement the understanding of tectonics and, accordingly, the position of mineral resources in the region.