Uranium-lead dating of granites of the Voznesenskyi massif (the Ingul megablock of the Ukrainian Shield)

The porphyry-like biotite-garnet granites (sample KВ-5-1) of the Sokolivkа quarry were studied. The quarry is located in the Kirovohrad granite massif on the southwest of Kropyvnytsky city. The aim of our geochronology investigation is to determine the age of granites of the Kirovohrad massif by the U-Pb isotope method using monazite. The age of granites from Kirovohrad massif by the U-Pb method using monazite has not been determined yet. According to our data, the porphyry granites of the Kirovohrad massif (Sokolivkа quarry) were formed 2034 million years ago. This U-Pb data of the porphyry-like granites is significantly lower than the U-Pb age of the granites from other parts of this massif. This may be due to the multistage formation of the Kirovohrad massif, for example, the Novoukrainskiy and some granite massifs of the Zhytomyr complex from Volyn’ megablock.

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Geochronology of Lithium-Bearing Granitoids of Ingul Megablock (Ukrainian Shield)

Stepanyuk¹,

Hrinchenko

Slobodian³

et al. 2018

VKNUGEOL

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Rare-metal elements are strategic metals which, in general, are extremely important for economic development or maintenance of defence capability of any country at the modern level. The list of needs for these strategic metals ranges depending on the level of economic development of certain country, but in general it includes such elements as Li, Ta, Nb, Be, Sb, W, REE and others. The majority of these elements has the lithophilous nature and, therefore, is characterized by close genetic relations with granites and pegmatites associated with them. In the world, industrial production of lithium is shared between deposits to lithium-bearing brine of saline depositions of marine basins (Argentina, Chile), some granites (China) and rare-metal pegmatites (Australia, China, Zimmbabve). In pegmatites lithium mineralization is represented mainly by spodumene (LiAlSi2O6), But other lithium-containing metallic minerals can also play an important role in production of this metal – petalite (LiAlSi4O10), minerals of lepidolite (Sa [Li,Al]3[Si,Al]4O10[F,OH]2) and amblygonite-montebrasite (LiAlPO4 [F,OH]) series. Rare-metal pegmatite of Ingul megablock of Ukrainian Shield can be treated as unique (insufficiently studied in world practice) pegmatitic formations in which the main metallic mineral is represented by petalite. In metallogenic interpretations two ore districts can be distinguished within the megablok, that are specialized on rare metals (Li, Rb, Cs, Be, Ta, Nb, Sn) – Polohivka and Stankuvatka. Deposits and numerous ore manifestations of rare metals formed in rather similar geological and tectonic conditions and have many common features – both country rocks composition and mineralogic composition of ores. Within Ingul megablock (Shpola-Tashlyk rare-metal district) a number of lithium rare-metal deposits associated with pegmatites is discovered. In order to determine the age of lithium mineralization in granites of Lypniazhka, Taburyshche massifs and vein bodies of pegmatitic and aplito-pegmatitic granites, which are selected from different localities of this megablock, are dated by U-Pd isotopic method by monazites. It is established that emplacement of vein granites of Ingul megablock occurred within rather narrow age interval – 2040-2020 Ma and it is not significantly separated in time from formation of most granitoids they are spatially associated with. This fact, together with geological evidences, gives grounds to make the assumption that rare-metal lithium pegmatite are formed in the same age interval.

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Uranium-lead dating of granites of the Voznesenskyi massif (the Ingul megablock of the Ukrainian Shield)

Cited by 3 publications

References 1 publication

Geochronology of Granitoids of the Eastern Part of the Inhul Region (the Ukrainian Shield)

Geochronology of Granitoids of the Eastern Part of the Inhul Region (the Ukrainian Shield)

Uranium-Lead Age of Granites of Kirovohrad Massif of the Inhul Megablock of the Ukrainian Shield

Geochronology of Lithium-Bearing Granitoids of Ingul Megablock (Ukrainian Shield)

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