Mihalchenko I.I.1, Larikov A.L.2, Zaiats O.V.2
1 – State institution Institute of Environmental Geochemistry of the National Academy of Sciences of Ukraine
2 – M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the National Academy of Science of Ukraine
Language: Ukrainian
Geochemistry and ore formation 2018, 39: 53-65
https://doi.org/10.15407/gof.2018.39.053
According to the results of the study, it was confirmed that a sampling of values of measurements of decimal logarithms of uranium mass fractions in Precambrian albitites of the Novokostyantinovsky deposit of the Central Ukrainian Uranium Region of Ukrainian Shield is statistically inhomogeneous and consists of four groups, which estimated medians of uranium mass fractions are much higher than the geochemical background of uranium of the initial granite. The sampling of decimal logarithms of measured values of thorium mass fraction (without taking into account the values of the fourth group on the value of uranium measurements) is statistically homogeneous with the estimation of the sample median, which is close to the geochemical background of this chemical element of the initial granite. It appears that the variation in the measured values of thorium mass fraction is a consequence of thorium local redistribution from original granite in the process of albitites formation. The high values of measured thorium mass fraction and the high correlation between uranium and thorium in the fourth group (the intersection of rich ores on the deep horizon) are the basis for confirming the co-occurrence and concentration of these elements in common minerals
in the deep (high-temperature) part of the pneumatolithic and hydrothermal column. It is assumed that change of oxidation degree of U in the ore-bearing fluids of uranium sodium metasomatites with U4+ (in high-temperature (>350 °C) conditions) on U6+ (at medium to low temperature (<250 °C) conditions) is possible. This substantiates the endogenous origin of ore-bearing fluids in uranium-bearing sodium metasomatites formation. It is suggested to consider the deep magmatic cell, the magmatic differentiates of which were formed Korsun-Novomirgorod anorthosite – rapacivi granite pluton, in particular, pneumatolithic and hydrothermal – formation of uranium (ore-bearing) sodium metasomatites, as the probable source of fluids.
Keywords: uranium, thorium, classification, ore, albitites, genesis, Novokostyantinovska uranium deposit.
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