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Registration Number

0214U005410, 0113U001469 , R & D reports

Title

Alkaline metasomatites of Azov and Baikal areas and their ore potential

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Head

Ponomarenko Olexandr Mykolaevich,

Registration Date

26-12-2014

Organization

M.P. Semenenko Institute of Geochemistry, mineralogy and Ore Formation

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Alkaline metasomatites of the Eastern Azov area are regarded as rocks formed by fenitization of wall rocks during influence of alkaline-ultrabasic and carbonatitic intrusions (not presented by modern erosion cut). Among fenites the K-Na varieties predominant. Alkaline metasomatites, as well as accompanying exocontactic fenites of typical carbonatites, are characterized by increased content of phosphorus, niobium and rare earth elements. High concentration of Zr and Nb are typical for apofenitic albitites, whereas apoquartzite metasomatitic rocks have a distinct rare earth specialization. This difference is explained by: 1) different distances from the source of fenitization and their erosion cut; 2) the composition of the country rocks. The isotopic composition of carbon from alkaline metasomatitic rocks of the Eastern Azov region indicates on their deep-derived. At the same time strontium isotope indicates on some crustal contamination. The rock-forming, accessory and ore minerals of alkaline metasomatitic rocks are studied in detail. By chemical composition (iron-magnesium composition, high fluorine content) they differ from the minerals of alkaline rocks in gabbro-syenitic massifs of the Azov area. The femic minerals composition as well as age of these rocks indicates that most occurrences of fenites were formed before formation of well-known large alkaline massifs of the Eastern Azov area (Oktyabrsky, South Kalchyk). Detail studies of rare-earth minerals allowed making conclusion that earlier so-called parisite as the main ore mineral, is presented by subgraphic accretion of three minerals - bastnaesite, parisite and synchysite. It was identified and analyzed some number of new minerals for the Azov area and Ukraine (tayniolit, Li-bearing amphibole, chlor-annite, baotite, cordylite, Y-zirconolite, bafertisite, jinshajiangite, hejtmanite, ecandrewsite etc.). New areas of fenite occurrences with high rare earth element concentration (1-1.5%) were discovered. It is indicated to the prospect of detection REE-rich ores in the Azov area.

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Веліканова Ольга Юріївна
Гаценко Віра Олексіївна
Дубина Олександр Володимирович
Коновал Наталія Михайлівна
Кривдік Степан Григорович
Моргун В'ячеслав Григорович
Пономаренко Олександр Миколайович

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2020-04-02