Maximum Depositional Age of Pre-Middle Paleozoic Terrigenous Rocks of the Vychegda Trough (Northeast of the East European Platform): Results of U–Pb Dating of Detrital Zircons

U–Pb dating (LA-ICP-MS) is carried out on detrital zircon from pre-Middle Devonian terrigenous deposits of the Vychegda Trough (southern margin of the Mezen syneclise) penetrated by Seregovo 1, Storozhevsk 1, and Keltma 1 parametric wells. Analysis of the detrital zircon ages and subsequent calculations of maximum depositional age (MDA) based on different algorithms has made it possible to clarify the stratigraphic position of the studied successions. The deposits of the Nyafta Formation, penetrated by Seregovo 1 well, have Middle Riphean MDAs. The MDAs of the Uftyug Formation zircons correspond to the Middle-Late Riphean, and those of the Ust-Pinega Formation correspond to the Late Riphean. For the Mezen Formation, penetrated by Keltma 1 well, the calculated MDAs for the first time suggest an Early Cambrian or younger age.