Bureya continental massif is one of the largest continental massifs in the eastern part of the Central Asian orogenic belt (CAOB) (Fig. 1), and knowledge of its geological structure is of fundamental importance in understanding the history of its formation. The 'basement' of the Bureya massif is commonly thought to be composed of metamorphic rocks of the Amur Group, which were, until recently, believed to be of Early Precambrian age [Krasny, Peng, 1999; Khanchuk, 2006]. However, U-Pb geochronological and Sm-Nd isotopic studies of metasedimentary rocks of the Amur Group demonstrate that the protoliths of these metamorphic rocks were formed in the Late Proterozoic and/or Paleozoic, and they were most probably for

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