Cretaceous and Jurassic intrusions in Crimean Mountains: The first data of U-Pb (SIMS SHRIMP) dating

U-Pb geochronological studies of igneous rocks of the Crimean Mountains were carried out for the first time. The ages of magma crystallization determined for gabbro-dolerites of the Dzhidair and Pervomaiskii intrusions point to the injection of these rocks during the Middle Jurassic Aalenian-Bajocian stage of magmatism. The Berriasian-Valanginian and Aptian age of sill-like bodies within the mass of volcanogenic-sedimentary rocks presumes the necessity to reconsider the common notion of an exclusively Albian magmatic event during the Cretaceous. High-precision U-Pb dating of magma intrusions allowed us to verify the age of Middle Jurassic magmatism and to distinguish the new Early Cretaceous Berriasian-Valanginian magmatism stage of basic composition.