Rare-earth mineralization in terrigenous deposits of the Shatak complex (Southern Urals): species diversity and features of chemical composition

Abstract

As a result of the study of terrigenous rocks of the Shatak complex, which includes deposits of the Kuz’elga and Karan subformations, rare earth minerals were found: allanite-(Ce), monazite-(Se), monazite-(Nd), xenotime-(Y), REE-bearing epidote, and unidentified connections. It has been established that during the metamorphism of terrigenous rocks of detrital zircon, it is a selective concentrator and thorium, a popular group of rare earth elements and thorium. The comparative analysis showed that, in terms of chemical composition, rare-earth minerals (monazite-(Ce) and xenotime-(Y)) from the Shatak rock are significantly important from heavy ones from other complexes observed on the western slope of the Southern Urals by the presence of gadolinium in monazite, and in xenotime – consecutive REE group represented by Ce, Nd and Sm. When calculating the thermal bar, characterizing changes in the composition of structural-material complexes of western origin, slopes from the main factors that determine the characteristics of the chemical composition of rare earth chemical elements, which are the chemical composition of mineral formation.