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The solid snow cover sediments were investigated by X-ray electron probe microanalysis (EPMA) with the aim of geochemical monitoring in Lake Baikal Region. The detailed study on the micron level of phase and chemical composition variations of solid sediments from monitoring profile at different degree of anthropogenic stress allows identification of basic pollution sources and evaluation of their influence on the environment of the region. Thus, the data of investigation of snow cover, as indicator towards the cha...

The X-ray electron probe microanalysis (EPMA) technique is developed for cassiterites and minerals of Ta and Nb. The phase and chemical composition of rare metal pegmatite cassiterites of the East Sayan Belt and their inclusions of Ta and Nb minerals were studied using the EPMA technique. The results of cassiterite investigations showed, that niobium and tantalum are contained both in isomorphous form, substituting the tin in the matrix of mineral and as mineral inclusions of columbitetantalites. The distribution ...