Age of the source rocks for quartzite of the Rodionivka Suite of the Inhul-Inhulets Series (Zhovte area of the Pravoberezhnyi region)
DOI:
https://doi.org/10.15407/dopovidi2019.12.065Keywords:
clastogenic zircon, Inhul-Inhulets Series, Pravoberezhnyi region, quartzite, U-Pb isotope ageAbstract
The Kryvyi Rih-Kremenchug structure is a part of the system of riftogenic structures that formed in the Sarmatian segment of the East European craton at the end of the Neoarchean. This area extends from north to south for 800 km, has a width of more than 800 km. The stages of formation of these structures are still poorly studied. The main unsolved problems include the age of their basement (consolidation) of the East European Craton, the rift initiation time and the chronostratigraphic division of sedimentary-volcanogenic rocks composing them. The Kryvyi Rih-Kremenchug structure has been formed in the western part of the Middle-Dnieper craton, whose tectonic blocks are traced up the West-Ingulets fault. The study of clastogenic zircon from metaterrigenous rocks along the entire Kryvyi Rih-Kremenchug structure allows us to establish the composition and age of the rocks of the basement on which it was formed. The La-ICP-MS method was applied to define the U-Pb age of detrital zircon populations from quartzite of the Rodionivka Suite of the Inhul-Inhulets Series (Zhovte area of the Pravoberezhnyi region) — 2.68; 2.93 and 3.2 Ga. Zircons of 3.2 and 2.93 Ga are present in small amount and correspond to tonalite gneisses of the Auly Series and TTG of the Sura Complex. Detrital zircons of 2.68 Ga predominate. A similar age of 2.62 Ga was defined for the intrusions of Na-K granites in the East-Hannivka band. In the Voronizh crystalline massif, the within-plate (anorogenic) metarhyolites of the Lebedin Series (2.62 Ga) underlie the Kursk Series, whereas granitoids of the Ataman complex (2.6—2.4 Ga) of the similar origin constitute numerous bodies in the framing of the Early Proterozoic folded structures. The new geochronological data suggest that felsic igneous rocks, close in age to the Neoarchean granitoids of the Ataman Complex and to felsic metavolcanics of the Lebedin Series of the Voronezh Crystalline Massif, that are likely linked to the early stage of Neoarchean rifting, were present in the Pravoberezhnyi region of the Kryvyi Rih-Kremenchuk structure.
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