Trace and rare-earth elements in garnets from silicate-carbonate formations of the Kusa-Kopan complex (Southern Urals)

Research subject. Garnets from silicate-carbonate formations and their halos with skarn mineral associations, developedin the historical mines pits of Southern Urals: Zelentsovskaya, Nikolaje-Maximilianovskaya, Akhmatovskaya,Perovskitovaya, Gubensky massif, Praskovie-Evgenyevskaya Shishimskaya. Aim. To study nature debatable origin. Materials methods. The composition garnets distributed both in rocks associations was analyzed using SEM-EDS (IPGG RAS) SIMS (Yaroslavl branch IPT RAS). Results. show predominantly a dark to black color, combination simple rhombododecahedron tetragontrioctahedron shapes. In terms composition, these materials correspond andradite – Ti-andradite, share shorlmite morimotoite end-members reaching 30 %. calcareous skarns are reddish color have rhombododecahedric habitus. an andradite-grossular isomorphic series, shorlomite morimotite not exceeding 3 For garnets, content trace rare-earth elements determined for first time, posi tive correlation Ti U, Y, Zr, Hf Nb established. Figurative points on binary diagrams (in coordinate axes content) plotted as trend garnet grossular–andradite–Ti-andradite series. rocks, unlike those characterized by increased content. main feature distribution spectra is positive Eu-anomaly, which observed all studied garnets. Conclusion. data obtained allowed authors assume that were formed result single geological process, essentially close formation. results petrographic-mineralogical geochemical studies “carbonatite” silicate-carbo nate Urals unlikely.