PETROLOGY AND CHROMITE PRESENCE OF THE RAI-IZ ULTRAMAFIC MASSIF. N.V. Vakhrusheva, P.B. Shiryaev, A.E. Stepanov, A.R. Bogdanova

The monograph presents the results of modern study of geological complexes that make up the unique Rai-Iz ultramafic massif in the Polar Urals, which hosts industrial deposits of chromium ores. The evolution of the material of ultramafic rocks during the long metamorphic history of the massif is traced. Based on the analysis of the olivine-chromium-spinel paragenesis, performed both for early associations of ultramafic rocks and for the products of their metamorphism and chromitites localized in them, a conclusion was made about the P-T-fO2 conditions for the formation of rock complexes and mineralization. The results of mineralogical and geochemical studies of chromitites, ultramafic rocks, as well as vein formations involved in the structure of the Rai-Iz massif are presented.