[en] A Th- and U-enriched granite has been found within a sequence of high-grade metamorphic gneisses and migmatites in the Flekkefjord area bordering the S Rogaland anorthosite province in SW Norway, where the country rocks and the other intrusions all have very low contents of these elements. The major-element distribution within the Homme granite suggests a certain magmatic differentiation, although a K- and Si-rich zone in connection with the discordant northern contact is supposed to be due to assimilation of felsic country rocks. This model was tested by studying the radioelements which exhibit the lowest values exactly in the northern K- and Si-rich zone, thus supporting the model of assimilation, while the alkali enrichment in the southermost part is connected with high contents of radioelements, thus suggesting a rest magmatic stage. (Auth.)