Mihalchenko I.I.¹, Zaiats O.V.¹, Andreev O.V.²
1 – M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the National Academy of Sciences of Ukraine е-mail: alcoldan@i.ua е-mail: zolgavikt@gmail.com
2 – Taras Shevchenko National University of Kyiv, Educational-Research Institute «Institute of Geology»
Language: Ukrainian
Geochemistry and ore formation 2016, 36: 35-46
https://doi.org/10.15407/gof.2016.36.035
In this paper, we present new petrographic and geochemical data from a single diamond drill hole 8568 into the Ruska-Polyana rare-metal granites of the Korsun-Novomyrgorod pluton of the Ukrainian Shield. The aim of this article is the investigation of geochemical specialization of Ruska-Polyana rare-metal granites. Rare-metal granites are situated on the south-eastern part of Ruska-Polyana massif. The overhead part of the bore hole 8568 crossed the gray-pink fine-medium-grained granite and dark pink aplitic granite in the overhead part. Abyssal variety of the Ruska-Polyana rare-metal granites are light pink mediumcoarse-grained and gray-pink porphyraceous granites, gray-pink medium-coarse-grained granite with blue quartz, gray-pink porphyraceous and pink-gray medium-coarse-grained granites with horblende relicts. Mass fraction’s of uranium and thorium in the samples of rare-metal granites was determined by XRF-method in the laboratory of educational-research institute “Institute of geology” of Taras Shevchenko National University of Kyiv . The rocks of overhead part of bore hole differ from lower part the greater values of measuring of mass fraction of uranium. The assessment of weighted average mass fraction of uranium of the gray-pink fine-medium-grained granite is 28.0·10–4 %. The assessment of weighted average mass fraction of uranium of the dark pink aplitic granite is 50.4·10–4 %. Uranium assessment of weighted average of the gray-pink medium-coarsegrained granite with blue quartz is 12.8·10–4 %. The assessment of weighted average mass fraction of uranium of the pink-gray medium-coarse-grained granite with horblende relicts is 11.9·10–4 %. The rocks of overhead part of bore hole differ from by bottom less variation of values of measuring of mass fraction of thorium. But on the assessment of weighted average mass fraction of thorium the rocks from upper overhead part of bore hole differ unimportant to the granite underbody of the cut. Assessment of weighted average mass fraction of thorium in the gray-pink medium-coarse-grained granite is 76.1·10–4 %. Assessment of weighted average mass fraction of thorium in the dark pink aplitic granite is 86.4·10–4 %. Assessment of weighted average mass fraction of thorium is 69.9·10–4 % in the gray-pink medium-coarse-grained granite with blue quartz. The assessment of weighted average mass fraction of thorium is 74.1·10–4 % in the pink-gray medium-coarse-grained granite with horblende relicts. Clark’s assessment of concentration of uranium and thorium are overdrawing 3.5 in all investigated variety of Ruska-Polyana rare-metal granites.The obtained data give grounds for thinking that uranium and thorium are element-satellites of the raremetal (Y, Ta, Nb, Sc and other). Ruska-Polyana rare-metal granites are geochemical specialized to uranium and thorium.
Key words: uranium, thorium, mass fraction, Clark’s assessment of concentration, geochemical specialization, rare-metal granite, Ruska-Polyana granite massif.
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