Havryliv L. Cenozoic dykes of the Argentine Islands (West Antarctica): composition, conditions of the formation and geologic relationships.

Dyke swarms are a reliable temporal and geodynamic marker that allows studying the links between magmatic and tectonic events during their emplacement. The clarification of their geological position is important for the reconstruction of the magmatic processes, as well as for the regional geological mapping and the correlation of different dyke formations. The dissertation is devoted to studying the geological position of the youngest dykes, distributed in the area of the Ukrainian Antarctic Station "Akademik Vernadsky" (UAS). The geological relationships between the dykes and country plutonic rocks of the Antarctic Peninsula granite complex (APGC), the Wilhelm archipelago gabbroid complex (WAGC) and the Barchans-Forge granite complex (BFGC), as well as the sequence of dykes emplacement has proven that dyking was held in at least two stages – Cenozoic and Mesozoic. The Mesozoic stage of dyke formation is represented by the dykes of gabbro-porphyrite and microdiorite of the Cretaceous age, which intrude the orogenic formation of the volcanic series of the Antarctic Peninsula (VSAP) and the layered gabbroid intrusions of the APGC. However, the presence of even more ancient dykes genetically associated with VSAP is also considered. The dykes of Cenozoic stage are represented by diorite porphyrites, basalts, diabases and dacites, which cut the granitoids of BFGC. Basalt and dacite dykes are identified for the first time in the UAS area.