Uranium and Thorium in Albitites of Novooleksiivka Ore Occurrence, the Ukrainian Shield
UDC 550.42 : 519.2 : 546.791/. 795 : 553.495 (477)
https://doi.org/10.15407/mineraljournal.37.04.085
I.I. Mihalchenko
M.Р. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladina Pr., Kyiv-142, Ukraine, 03680
Е-mail: alcoldan@i.ua
Uranium and Thorium in Albitites of Novooleksiivka Ore Occurrence, the Ukrainian Shield
Language: Ukrainian
Mineralogical journal 2015, 37 (4): 85-97
Abstract: Purpose. The aim of the paper is the estimation of the degree of uranium and thorium concentration in albitites of the Novooleksiivka ore occurrence, Central-Ukrainian uranium ore-bearing district of the Ukrainian Shield. Methodology is based on collection of the data from early and modern geological investigations, geological and radiometric documentation of drill cores, sampling and statistical calculations. The values of common logarithms of determinations of uranium and thorium mass parts in the samples of albitites are calculated before statistical computation. Elements of heterogeneity of general sample are sorted out by the method of analysis of the correlation diagram (Carlier, 1966). Statistical relations between uranium and thorium have been investigated in these groups using one of nonparametric methods of correlation analysis — determination of Spearman’s rank coefficient correlation. Verification of the presence of statistical relation is carried out by calculation of determination coefficient, using the values of coefficients b1 и b2 of linear equations of regressions of thorium to uranium, and uranium to thorium, accordingly. Concentration of uranium and thorium relative to geochemical background of these chemical elements in granites of Novoukrainka massif is calculated by estimations of the values of geometric means of uranium and thorium in these groups. Results. The study tested that the investigation sample to determine uranium and thorium mass parts in the chemical composition of the samples of albitites of Novooleksiivka ore occurrence is not homogeneous, and consists of two groups. As a result of estimation of geometric means of uranium and thorium mass parts two concentration levels of uranium and thorium relatively unaltered granites of Novoukrainka massif are set in these groups. The estimation of coefficients of concentration in the first group of the pair’s values (samples of "nonmetallic" albitites) are for uranium — 8.8, for thorium — 2.2, and in the second group of the pair’s values (samples of "ore" albitites), accordingly, 192 and 5.7. Scientific novelty. The existence of alkaline sodium metasomatites of high temperature andradite-actinolite-diopside group of apogranitic metasomatitic facies with two concentration levels of uranium and thorium relative to unaltered granites of Novoukrainka massif is proved for the first time. It testifies to the possible consideration of association of these chemical elements as paragenetic.
Keywords: uranium, thorium, coefficient, concentration, albitite, Novooleksiivka ore occurrence.
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