| Annotation |
The actuality of the study is caused by the necessity to identify the maximum permissible concentrations of toxic elements in natural and technogenic complexes of the Akatuevsky polymetallic deposit. Determination of elemental composition of samples was carried out by the X-ray fluorescence method at the Geological Institute of the GIN SB RAS (Ulan-Ude), as well as by the ICP-MS method in the laboratory of SGS Vostok Limited CJSC (Chita).
Concentrations of ore and rare elements, including potentially hazardous toxic elements, have been determined in all components of the natural-technogenic complexes of Akatuevsky polymetallic deposit (host rocks, ores, technosols, soils). It has been shown that the maximum permissible concentrations of toxic elements in the technosols of Akatuevsky deposit are significantly exceeded. Thus, As content in the host rocks is 127 times more than their concentration in sedimentary rocks of the Earth’s crust, Pb – 2,3 times, Zn – 1,5 times, Cu – 5 times. It has been stated that the toxic element content in the soil, in the closest frame of the tailings dump, exceeds the maximum permissible As concentration by 489 times, Pb – by 22 times, Cd – by 85 times.
In the content of rare earth elements (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y), their regular reduction is determined in the order of: host rocks → technosols → lead-zinc ores → soils. Negative europium anomaly was observed in all examined samples. It has been defined that the geochemical specialization of the technogenic formation materials of the Akatuevsky deposit is closely connected with the elemental composition of the extracted lead-zinc ores |
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