Geochemical Features of the Quaternary Deposits of the Irkutsk’s Reservoir Zone under Technogenic Conditions

Abstract

The article considers the some geochemical characteristic of the loesslike and bottom sediments of the area Novo-Razvodnoy of the Irkutsk's reservoir. Main objectives of this research are to determine contents of trace elements (V, Cr, Co, Ni, Cu, Zn, Ga, Pb, As, Rb, Sr, Y, Zr, Nb, Ba, La, Ce, Nd) and major elements (CaO, TiO 2 , MnO, Fe 2 O 3(total) ) in the investigated samples by X-ray fluorescence analysis method (XRF), to establish the trace elements distribution dynamics on the lateral profile of the area Novo-Razvodnoy, to reveal the pollution degree of the studied sediments and to calculate the specific geochemical coefficients Rb/Sr and Ca/Sr in the studied sediments. As a result of the studies, it is established that the dried part of the coastal shallows experiences the higher technogenic load in comparison with other considered zones of the lateral profile. This fact was confirmed by the maximum content of As (12 mg kg -1 ) exceeding by 6 times the established value of the maximum permissible concentrations in soils (MPC) and the maximum calculated values of pollution load index (PLI) and geoaccumulation index (I geo ) for arsenic.