The age of monzonites of the eastern part of the Korsun-Novomirgorod pluton
© E.E. Shestopalova, L.M. Stepanyuk, T.I. Dovbush, I.N. Kotvitskaya, 2015
The article presents the results of monzonites research of the eastern part of Korsun-Novomirgorod pluton. The pluton is situated in
the northwestern part of the Ingul megablock. Besides basic rocks varieties - gabbro-anorthosite and rapakivi granites the rocks of monzonite
composition of different genesis are widely presented here. Small bodies of monzonites form outputs among rapakivi granites of Shpola massif
at the junction of tectonic structures of different rank. Monzonite is a hybrid rock which contains xenoliths of frame rock and possibly ancient
dyke formations. Zircon is represented by several generations, which are distinguishable by optical studies, as well as by different U/Th ratio.
Some grains contain a nuclei and zircon inclusions, appearance of which was determined by the process of contamination. All fractions
obtained discordant zircon age values. Dating calculated by isotope ratio 207Pb/206Pb has been taken as the most reliable. Due to the
presence of relict zircons received isotopic age of the figures are overstated and do not reflect the formation of monzonite. As the maximum
possible monzonite age we can take a minimum age, calculated by 207Pb/206Pb. The assumption about the formation of monzonite melt as
a result of contamination of basic magma by ancient crustal rocks of acid composition has been given, which does not contradict the results
of the study of the isotopic composition of strontium, neodymium, and geochronological data.
Key words: monzonites, zircon, generations, dating, isotopic age, Korsun-Novomirgorod pluton.