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Registration Number

0215U003060, 0110U005440 , R & D reports

Title

Crystal chemistry, genetic features and typomorphism of rock-forming and ore minerals of the alkali rocks of the Pre-Azov region

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Head

Taran M.N.,

Registration Date

19-01-2015

Organization

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

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By a series of modern local methods of investigation a wide spectrum of rock-forming (pyroxenes, amphiboles, mica, feldspars) and ore (zircon, apatite, fluorite, allanite, britholite, cerite etc.) minerals from missives of alkali rocks of the Pre-Azov region related to rich deposits and occurrences of rear-earth-zirconium ores are studied. Combination of spectroscopic and micro-analytical methods gave a possibility to reveal crystal chemical characteristics of different physico-chemical parameters of mineral formation: the presence of Zr-admixture and optical active centers (OAC) Fe2+(M1) in aegirines from alkali metasomatites, OAC IVFe3+ in micas from carbonatites, abundance of СО3- and ОН-defects in the structure of apatites from syenites etc. Thermo-barometric, micro-analytic and spectroscopic (IR, luminescence) investigation of zircons gave a possibility to reveal specific features of their composition and structure in every massif of alkali rocks, to confirm and specify their high-temperature crystallization (>1000 ?С) from a magmatic melt in Azov deposit (South-Kalchic massif). Detailed investigation of the unique silicate REE-ores of Anadol occurrence allowed to determine their mineral composition, for the first time in Ukraine to describe t?rnebohmite and galetite (the third finding in the world), to determine the succession of rock formation and alteration in time of the PTX-parameters of the metasomatic hydrothermal process. It is established that allanite, bastnaesite, fluorite and quartz are of several generations which represent a wide range of variations of temperature and oxygen fugacity. The age of the high-temperature metasomatic mineralization is determined as 1800 million years.

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Ільченко Катерина Олександрівна
Возняк Дмитро Костантинович
Кривдік Степан Григорович
Лупашко Тетяна Миколаївна
Таран Михайло Миколайович
Хоменко Володимир Михайлович

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2020-04-02