Composition features of monazite and xenotime as a basis of partition of Verkhneurmiysky granite massif (Amur river region)

The main lines of monazite-(Ce) and xenotime-(Y) composition evolution were established in granitoids of the Verkhneurmiysky massif in Amur River region. It is suggested to use revealed features of accessory phosphates composition for a regional partition of granitoids and the assessment of intrusive massifs orepotential.