Breed Associations of the Gaisin Block of the Ukrainian Shield

Abstract

The Gaysins block is characterized by a wide range of both metamorphic and ultrametamorphic formations. Ultrametamorphic formations are represented by an association of rocks with a transition from charnockitoids to two-feldspar granites. Remnants of metamorphic rocks are composed of diafluorinated varieties to varying degrees. Geological surveys of the last decades have discovered on the territory of the Gaysin block structures of variegated composition, which are represented by both metamorphic and ultrametamorphic rocks. The most studied are structures in the area of the settlements of Chagiv, Tyagun, Sitkovtsi, Naraevka, Tsibuliv and Popudnya. The wide variety of the mineral composition of the rocks of the Gaysinsky block is due to the metamorpho-metasomatic transformations of the primary parageneses formed under the conditions of the granulite facies. These transformations are taking place against the background of a decrease in the PT parameters of regional metamorphism.