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Comparative genetic and mineralogical analysis of rare-earth and zirconium mineralization of the Volyn and Prizov blocks of the Ukrainian Shield

ABSTRACT

Report on the scientific research work: 222 p., 121 figures, 25 tables, 118 references.

The objects of the study are minerals associated with endogenous REE, yttrium, and zirconium mineralization of the Azov and Volyn megablocks of the Ukrainian Shield.

The purpose of the work is to compare the mineral composition, the conditions of formation of geological objects containing REE, Y, Zr in the Azov and Volyn megablocks, to establish the reasons for the absence of industrial REE mineralization in the Yastrubets zircon ore deposit and the conditions of accumulation of REE, Y in the unique Azov deposit.

Research methods – X-ray phase and X-ray structural, thermobaro-geochemical (inclusion research methods), electron-probe, luminescence (FL, X-ray), IR-spectroscopic, ICP MS analyses.

The Azov and Yastrubets massifs are typical hypersolvus syenites, the anorthoclase-perthite of which contains 55-75% of the albite component, and the femic minerals of high or marginal iron composition (hedenbergite, ferroghastingsite, fayalite, anite) are characterized by low values of the oxidation coefficient. Petrologically, the objects are identical.

The initial deposition of the main REE-concentrating minerals (both zircon and britholite) of the Azov and Yastrubets syenite massifs is magmatic. Britholite in the Azov deposit crystallized both simultaneously and earlier than zircon. This feature of the crystallization of these minerals explains both their simultaneous and separate accumulation in the deposit.

High thermobaric (>1030°C, >(450-520) MPa) flows of CO2 fluid took part in the formation of the Azov deposit. Post-magmatic fluids caused metasomatic replacement of britholite, as a result of which redistribution of REE and Y occurred: the content of light REE increased in monazite, and heavy REE and Y increased in bastnesite and secondary britholite. In the Azov deposit, under the action of CO2 solution, siderite was also formed, in the Yastrubets - carbonate-fluorite veins. The absence of britholite in the Yastrubets deposit is probably caused by the very low content of phosphorus in the magmatic melt, as a result of which the REE were forced to concentrate in fluorite. Fluorite mineralization with a small content of yttrium and rare earths occurs both within and outside the massif. Currently, it is not an object for the industrial extraction of yttrium and rare earth elements from them.

Authors:

Vozniak Dmytro Kostiantynovych

Halaburda Yurii Andronovych

Hrechanovska Olena Yevhenivna

Chernysh Dariia Serhiivna

Ilchenko Kateryna Oleksandrivna

Lupashko Tetiana Mykolaivna

Other authors:

V.S. Melnykov, S.S. Ostapenko

Keywords:

REE, Y-concentrator minerals, hypersolvus syenites, Azov deposit, Yastrubets ore occurrence, REE-U-Th Dibrova deposit, fluid inclusions, zircon, high thermobaric flows of CO₂ fluid

Head of the research:

Vozniak Dmytro Kostiantynovych

Registration Card (RC):

0106U011535

Execution period of the research:

2007 - 2011