Alkaline and acid metasomatic rocks in gneiss-amphibolite complexes of the Urals: A case history of the Ufalei metamorphic block, southern Urals

The gneissamphibolite complexes in the Urals (Ufalei, SysertIlmenogorsk, and others in the southern and central Urals; Malyk, Marunkeu, Kharbei, Khordyus, and Nerkayus in the northern segment of the region) are complex heterogeneous rock associations formed on fragments of the ancient continental crust in the course of multiple activation of tec-tonic, magmatic, metamorphic, and other processes within a chronological range from the Middle Riphean to the Early Jurassic (220 Ma) [15]. The Ufalei meta-morphic block should be regarded as a typical example of these complexes. This block is well studied and may serve as a reference object for further investigations.