METAMICT MINERALS FROM THE ALKALINE FELDSPAR SYENITES, THE UKRAINIAN SHIELD

https://doi.org/10.15407/mineraljournal.41.01.035

UDC 549+552.3 (477)

I.M. Gerasimets, https://orcid.org/0000-0003-4670-0216, Researcher ID: A-3188-2019
H.O. Kulchytska, http://orcid.org/0000-0002-7206-4797
V.M. Belskyi,  Researcher ID: K-8607-2018
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine. 34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
E-mail: Herasimets@i.ua

METAMICT MINERALS FROM THE ALKALINE FELDSPAR SYENITES, THE UKRAINIAN SHIELD

Language: Ukrainian
Mineralogical journal 2019, 41 (1): 35-48

Abstract: On the Ukrainian Shield there are three alkaline feldspar syenite massifs with Zr-REE mineralization. These are the Azov, Yastrebetsky and Velyka Vyska massifs. The main ore minerals of syenites (britholite, allanite, chevkinite and zircon) are mainly metamict or semi-metamict varieties. The aim of the article was to investigate how the genesis of metamict minerals in alkaline feldspar syenites agrees with the hypothesis that the amorphous state of matter is caused by radioactive irradiation. A comparative analysis the shape of metamict and crystalline varieties, rims around metamict minerals, formed external and internal cracks, the U, Th, REE, Y content and other impurities has been made. Research results do not give grounds to associate the amorphization of rare-metal minerals of syenites with irradiation under the influence of radioactive impurities. Amorphization of minerals from alkaline feldspar syenites was caused by increased general content "non-formular" components and not only radioactive elements oxides. For minerals from the Azov and Yastrebetsky syenites REE and Y oxides had the greatest influence and for Velyka Vyska syenites it is hydrated silica. It is assumed that metamict minerals were formed from individual droplets of a silicate melt enriched on Zr, REE, P, C and other elements that were gradually separated from the magmatic melt as a result of liquation. The multicomponent composition of liquates on the background of rapid cooling to solidus temperature led to their hardening. Formed vitreous minerals though approached in composition to specific mineral species on the background of low temperature due to the redundancy of incompatible components retained disordered structure.
Keywords: chevkinite, britholite, allanite, Azov stock, Yastrebetsky stock, Velyka Vyska massif.

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