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0217U001115,
0112U002428
,
Thorium mineralization in the Precambrian complexes of the Ukrainian Shield; mineralogy, geochemistry
Stepaniuk Leonid Mykhailovych,
24-01-2017
nstitute of Geochemistry, Mineralogy and Ore Formation
New results of mineralogical, geochemical and geochronological study of ore occurrences and deposits of potassium-uranium rock association of the Ukrainian Shield (USh) are presented. Chemical composition of thorium minerals has been thoroughly studied, paragenetic ore mineral associations from high-, medium- to low-temperature ones have been defined. High contents of thorium exceeding abundances for rocks of USh have been established for aplitic-pegmatoid granites, significantly microclinic pegmatites, related silica-potassium magnesia-iron-potassium metasomatites. Among host rocks exceeded contents of Th are typical for graphite-bearing gneiss, aplite-pegmatoid granite, related to it pegmatite and ore-bearing metasomatite. Three last ones were formed from graphite-bearing gneiss during granitization. Major Th-minerals in ore-bearing metasomatites of silica-potassium rock association are monazite, thorite, uraninite (the Bezymennyi ore occurrence); monazite, uraninite (the Khmilnitskyi and Zavalie ore occurrence); monazite (the Haivoron ore occurrence and Ostapivske deposit); monazite, thorite, uraninite, coffinite (the Kalynivske deposit); monazite, pitchblend, brannerite (the Dibrovske deposit). Two stages of thorium minerals formation in the USh during Precambrian have been established: Paleoproterozoic, 2080-1960 Ma, and Mesoarchaean, 2933-2786 Ma. Last one is in Eastern part of the USh only.
Бондаренко Сергій Миколайович
Донський Микола Олександрович
Карли Захар Вадимович
Степанюк Леонід Михайлович
Сьомка Володимир Олексійович
2020-04-02
Updated: 2026-01-13
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