Abstract
The paper presents the results of U–Th–Pb geochronological studies of zircons from metamorphic rocks of the Amur group of the Synchyga Block of the Jiamusi continental massif. It is shown that the garnet-biotite-sericite schists of the Amur group have a primary sedimentary origin. The lower depositional age of the protolith can be determined by the age of the youngest zircons from group with Neoproterozoic ages ~832 Ma. The upper age boundary of protolith, apparently, corresponds to the age of metamorphic zircons ~533 Ma. Thus, the schists of the Amur group of the Synchyga Block are of Neoproterozoic in age rather than Early Precambrian, as was accepted earlier.
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