Abstract
The purpose of the study is to investigate rare-earth elements distribution features in all components of the natural-technogenic complexes of Akatuevsky, Blagodatsky and Novo-Shirokinsky polymetallic deposits of Eastern Transbaikalia. Due to increasing demand for rare-earth elements (REE) in various fields of industry, identification of features of REE distribution in natural-technogenic complexes of polymetallic deposits of Eastern Transbaikalia is relevant. The chemical elements of the REE group include 15 elements, yttrium (Y) and the lanthanoid group consisting of 14 elements (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu). Determination of the elemental composition of samples was carried out by X-ray fluorescence method in the Geological Institute of the Geological Institute of the Siberian Branch of the Russian Academy of Sciences (Ulan-Ude) and by ICP- MS method in the laboratory of SGS Vostok Limited (Chita). In the process of investigations REE concentrations in all components of natural-technogenic complexes of Akatuevsky, Blagodatsky and Novo-Shirokinsky polymetallic deposits (lead-zinc ores, technozems, soils) were determined. Their regular decrease of REE concentrations in the order: soils→technozems→lead-zinc ores was established. In the most of studied samples there is a decrease of heavy lanthanides content relative to light ones, as well as negative europium anomaly, in some samples of lead-zinc ores positive europium anomaly is observed. Europium anomaly magnitude (Eu/Eu*) is an indicator of the degree of differentiation of magmatic melts, determined by plagioclase fractionation processes. It is known that feldspars serve as the main controller of the Europium anomaly. The phenomenon of a negative europium anomaly is observed if plagioclase remains in the source after fractional crystallization or partial melting. Positive europium anomaly in sulphide ores is caused by the presence of barite, as well as by the accumulation of plagioclase in the liquid phase due to the fractionation process. REE is known to have adverse effects on the environment due to its high biological and biochemical activity. Modern methods of remediation of the potential damage to the environment have been proposed
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