Z.V. Karly. MYKOLAIVSKE ORE OCCURRENCE OF REE-U-Тh MINERALIZATION IN THE BUG URANIUM ORE REGION OF UKRAINIAN SHIELD

https://doi.org/10.15407/mineraljournal.41.03.065

UDC 552.13 + 553.2

MYKOLAIVSKE ORE OCCURRENCE OF REE-U-Тh MINERALIZATION IN THE BUG URANIUM ORE REGION OF UKRAINIAN SHIELD

Z.V. Karly, https://orcid.org/0000-0003-4946-866X

S.M. Bondarenko, https://orcid.org/0000-0001-7948-3583

V.O. Syomka, https://orcid.org/0000-0001-5202-4045

L.M. Stepanyuk, https://orcid.org/0000-0001-5591-5169

L.V. Syomka, https://orcid.org/0000-0002-7059-2502

M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine

34, Acad. Palladin Ave., Kyiv, Ukraine, 03142

E-mail: karly@nas.gov.ua

Language: Ukrainian

Mineralogical journal 2019, 41 (3): 65-81

Abstract:

Mykolaivske ore occurrence REE-U-Тh mineralization is located in the north-eastern exocontact of the Voznesensk massif of aplite-pegmatoid granites, in the immediate zone of the Pervomaysk deep fault. The petrographic features of the ore occurrence are istablished. The rocks opened with drill holes are represented by metamorphic, ultrametamorphic, magmatic and metasomatic formations. The oldest varieties include the metamorphic rocks of the Kamiano-Kostuvate series which are intensively cataclased and milonitized with associated and abundant chloritization, tourmalinization, silicification and silica-alkaline metasomatism. It is established that ore formation is represented by accessory, superimposed REE-U-Тh and sulfide mineralizations. Accessory mineralization is confined to aplite-pegmatoid granites and represented by zircon, monazite and apatite. The REE-U-Тh mineralization is confined to the cataclastic zones of aplite-pegmatoid granites and gneisses and represented by monazite, xenotime, uraninite, brannerite, and an unknown iron-uranium mineral. The most contrast REE-U-Тh mineralization is was in quartz-biotite-feldspar metasomatites as well as garnet- and sillimanite-bearing alaskitic aplites. Sulfide mineralization is widely developed in cataclased aplite-pegmatoid granites and tourmaline- and graphite-bearing aluminous gneisses.

Keywords: uranium, thorium, monazite, uraninite, granites, metasomatitеs, ore formation.

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