Geological position and age of the Man’hobeyu suite (RF1?) in the Subpolar Urals

The geological position and age of the Man’hobeyu suite in the Subpolar Urals are considered, which in modern stratigraphic schemes refers to the Lower or Middle Riphean formations and is considered as the basal deposits of the Upper Precambrian of this region, which is stratotype for the Precambrian of the entire Timan-Northern Ural region. Based on the results of new isotope-geochronological studies, taking into account the available geological data (structural, petrological, mineralogical), the rationale for the idea, that the Man’hobeyu suite cannot be regarded as an independent stratigraphic subdivision is given. It is a rock association of predominantly low-temperature diaphthorites and cataclasites in high-temperature metamorphites, analogous to those of which the Lower Precambrian Nyartin complex consists. Isotopic-geochronological data make it possible to unambiguously classify the metamorphosed rocks, which is allocated as the Man’khobeyu suite, to the Lower Precambrian formations. At the same time, the most preferable assumption is the Early Proterozoic age of the protoliths of the metamorphic rocks of both the Man’khobeyu suite and the Nyartin complex.