Variations in the contents of trace and rare-earth elements in the charnockite-enderbite rocks of the Sharyzhalgai granulite complex cannot be accounted for by only metasomatic processes, which produce these rocks by the replacement of their metamorphic proto lith. Use of the magmatic replacement model for the fractionation of trace elements enabled us to calculate a series of model compositions that realistically approximate the REE patterns observed in natural enderbites and chamockites. As our data indicate, enderbite is a metasomatic rock, which is produced by the interaction between migmatizing fluid and metamorphic protolith. Charnockite is the product of enderbite melting in columns of magmatic replacement. As geochemical modeling indicates, transition between enderbite and the melting front occurred through various stages of partial melting. Throughout all of the magmatic replacement stages, the contents of trace elements in the phases were controlled by the chemistry of the percolating migmatizing fluid.