The composition of the material from provenances and its changes under the influence of transportation and redistribution are reflected in the lithology of bottom sediments both in natural water bodies and in man-made reservoirs. A great body of interesting data on the mineralogy of sediments in natural water bodies has been collected and analyzed to date 1-5. Unfortunately, data on the formation of the mineral assemblage in man-made reservoirs are practically unavailable. This work considers for the first time some mineralogical features of sedimentogenesis in reservoirs of the Angara basin (hereafter, Angara reservoirs), which are based on the results of the mineralogical analysis of a coarse silt fraction of bottom sediments collected by the author of the present communication from 1972 to 2002.
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