Trace and Rare Earth Elements and Hf Isotopic Composition in Zircons from the Paleoproterozoic Diorite–Granodiorite Plutons of the Kursk Block of Sarmatia as Indicators of Petrogenesis

Lu–Hf isotopic composition of zircons from the calc-alkaline diorite–granodiorite intrusions of the Stoilo-Nikolaevskii complex in the margin area of the Kursk block is an important indicator of petrogenesis and the tectonic environment of their formation. The morphological features of zircon, the Th/U ratio, the distribution of rare earth elements, and the high crystallization temperatures according to the Ti-in-Zrn thermometer are evidence of its magmatic nature. Isotopic Hf composition indicates inhomogeneous, primarily Paleoarchean sources with a large spread of negative εHf(T) values and model ages. The diorite–granodiorite massifs were formed in the magmatic back-arc region on the ancient continental margin.