O.V. Dubyna, RARE EARTH MINERALS IN VEINED NEPHELINE SYENITES OF THE CHERNIHIVKA
https://doi.org/10.15407/mineraljournal.44.01.071
UDC 549.552.33(477)
RARE EARTH MINERALS IN VEINED NEPHELINE SYENITES OF THE CHERNIHIVKA CARBONATITE MASSIF OF THE AZOV REGION
O.V. Dubyna, DrSc (Geology), Ass. prof.
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
Taras Shevchenko National University of Kyiv, Institute of Geology
90, Vasylkivska Str., Kyiv, Ukraine, 03022
E-mail: dubyna_a@ukr.net; orcid: 0000-0002-6003-4873
S.G. Kryvdik, DrSc (Geology & Mineralogy), Prof.
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
E-mail: kryvdik@ukr.net; orcid: 0000-0002-8356-1115
O.A. Vyshnevskyi, PhD (Geology & Mineralogy),
Senior Research Fellow, Leading Researcher
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
E-mail: vyshnevskyy@i.ua; Researcher ID: I-9996-2018
Language: Ukrainian
Mineralogical journal 2022, 44 (1): 71-79
Abstract: We studied partially altered veined nepheline syenites at the Chernihivka carbonatite massif of the Azov region, Ukraine. The major minerals of the syenite are albite, altered nepheline, biotite and calcite. Fluorapatite, allanite-(Ce), monazite-(Ce), barite and stronalsite occur as minor accessory phases. The primary minerals, containing REE in the veined rocks, reflect re-equilibration in a mineral/fluid systems and recrystallization of primary rock-forming minerals. The high initial concentration of CaO, CO32–, alkalis and volatile components caused a concentration of REEs in the late differentiated portions of the phonolite melt. The intrusion of the melt into wall-rocks of different composition, together with the excees of Al and Si in solution, caused allanite-(Ce) crystallization. Subsequent postmagmatic fluids contributed to Ba, Sr and REE leaching from major rock-forming apatite and calcite and led to the crystallization of secondary monazite-(Ce), barite and stronalsite.
Keywords: allanite-(Ce), monazite-(Ce), barite, stronalsite, nepheline syenites, Chernihivka carbonatite massif, Azov region, Ukraine.
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