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UDC 553.493.6(470.55/.58) RARE EARTH PEGMATITES AND CARBONATES OF THE UFALEY METAMORPHIC COMPLEX (THE SOUTHERN URALS)
V. N. Ogorodnikov, Yu. A. Polenov, V. V. Babenko, A. N. Savichev
In the middle of 1970s, a carbonatite-napheline-siyenite formation, which later was named by Yu.A.Bagdasarov the carbonatite formation of linear-fractured zones, was revealed at the Urals for the first time. Later carbonatites were discovered to the west in the Ufaley metamorphic complex. As distinguished from the Ilmenskaya and Vishnevaya mountains complex, which is characterized by the ceric rare earth mineralisation, the Ufaley carbonatites are associated with subalkalic granitoids and are clearly yttric. The carbonatites are confined to the Vendian albitisation and silification. The appearance of uraniferous and yttric tantalumniobium minerals (fergusonite and yttrocolumbite) is connected to formation of albitite and carbonatite. In the carbonatites formed later there is a large portion of apatite, titanomagnetite, rutile, titanite, xenotime, pyrochlore, columbite, yttrium epidote (Y = 400.7-4729.6; Nb = 1387.6-2920.2; Ta = 10.2-86.3; U = 4.1-50.4; U/Th = 11.0-37.0; Zr = 7.2-20.1; Sr = 178.8-1397.0 g/t). There are no distinguished marble strata with sulphide, ruby, or any other mineralization represented by carbonatites.
Key words: carbonatites, pegmatites, yttrium, cerium, specialisation, rare earth, granitisation, granitegneiss, metasomatites.
DOI 10.20403/2078-0575-2016-1-86-93 |
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