FEATURES OF LOCALIZATION OF APATITE-BEARING ALBITITES OF THE KIROVOHRAD ORE DISTRICT (THE INHUL MEGABLOCK OF THE UKRAINIAN SHIELD)

Abstract

Geological setting and features of localization of apatite-bearing albitites of the Novokostiantynivka ore field and the Kirovohrad ore district in tectonic structures of the Inhul Megablock of the Ukrainian Shield are considered for the first time. The typical occurrences with increased phosphorus grades are spatially related to contact of the Novoukrainka massif and the Korsun- Novomirhorod pluton: Ulianivskyi, Tymoshyvskyi, and other occurrences. Unusual sodium metasomatites with 8 % of P2O5 are spatially related to conventional apatite-less albitites. The former ones are formed inside the bodies of the latter ones as zones with thickness up to a few score of meters. Observed length of bodies of albitites rich in apatite is hundreds of meters. The apatite-bearing albitites have increased radioactivity of thorium- or mixed origin. They have anomalous grades of P, Th, REE, Y, Zr, U. For most of the elements a relation to certain minerals is identified. It is an apatite in respect to phosphorus. High Th grades are due to thorite. All features of apatite-bearing albitites listed above differ from conventional uranium-bearing albitites. The latter ones are always of uranium origin with low-grade P, and REE, Y, Ве, Zr. The ore occurrences of apatite-bearing albitites of Novokostiantynivka ore field and Kirovohrad ore district can be compared to the famous Itataia uranium-phosphorus deposit (north-eastern part of the Brazil Shield). It belongs to albitite type deposits and is confined to marble layers and metamorphic rocks of Early Proterozoic. They also can be compared to similar occurrences of the Zhovta Richka deposit of the Kryvyi Rih.