Andreiev O. Detrital monazite of Ukraine: age, geochemical features and its potential origin

It’s shown that Proterozoic-Early Paleozoic (1500 – 400 Ma) detrital monazites (totally 1500 single grains analyses) in Devonian, Paleogene, Neogene, Quaternary sediments have wide distribution with tendency to increase from East (single grains finding) to the West (up to 98%) of Ukrainian territory. The proposed geochemical criteria allow to discriminate monazites from mostly high metamorphic grades, mostly low metamorphic grades. Archean-Paleoproterozoic (‘early’) detrital monazite (more than 1500 Ma) corresponds to monazite from rocks of Ukrainian shield by age and discrimination criteria. It’s shown that Neoproterozoic-Paleozoic ‘young’ detrital monazite (1000-400 Ma) possibly represents erosion of acid metamorphic parent rocks with relatively low grade, which have no direct analogues within Ukrainian Shield (Eastern European Craton). Age and chemical composition of young monazite gives evidence that different areas could be source of such detrital monazite. Source areas could be Neoproterozoic terrains of Europe including ancient Eastern Carpathian’s rocks.