UDC 553.495:553.493.68: 553.493.65(477.63) • 📖 Issue 1(29)/2019 • 57-72 pages
Geohìm. tehnog. (2019) 1:57-72
Pokalyuk V., Verkhovtsev V., Mikhaylichenko А., Mihalchenko І., Zhyliak E
The paper compares the Dibrovskoe uranium-thorium-rare-earth ore occurrence of the Ukrainian shield (northern Azov region) by a number of criteria (structural-tectonic, formational, stratigraphic, geochronological, lithological, mineral-petrographic, geochemical) with similar well-known objects of the Ukrainian shield (Nikolo-Kozelskoye deposit, Severo-Tersyan ore occurrence, etc.).The objects are concluded to be genetically similar. These deposits and ore manifestations are localized in the formation rocks of ancient metamorphosed conglomerates, gravelites and sandstones and belong to a single stratigraphic level – the base of the paleoproterozoic protoplatform cover. New mineralogical and geochemical data have been obtained confirming the initially sedimentary (alluvial) genesis of thorium-rare-earth concentrations of the Dibrovskoe ore occurrence. The genesis of uranium concentrations in the ores remains disputed – it is associated with the influence of both sedimentary syn-diagenetic and superimposed epigenetic, metamorphic, ultrametamorphic, metasomatic processes manifested in the ore occurrence, whose role in ore formation remains to be assessed. The main search criteria for the complex uranium-thorium-rare-earth mineralization of the Dibrovsky (Nikolo-Kozelsky) type were specified: the main local search criteria are the castle parts of the synclines and areas with an increased capacity of clastogenic pre-iron strains of the lower skelevatsky stratigraphic level. A favorable factor is the proximity of archean microcline monazite-containing granite massifs, which served as the area of weathering and the source of clastogenic material. A list of promising structures within the eastern part of the Ukrainian Shield has been outlined.
Keywords: bentonite, steel corrosion, steel-bentonite interface, phase bentonite changes, illitization, Green Rust, ferrihydrite
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