Autometasomatic processes in granitoids of Neroysk-Patok massif (Circumpolar Urals)

The granitoids of the Neroysk-Patok massif exhibit autometasomatic zones in which potassium enrichment is followed by that of sodium, and later, by acid leaching. Such processes affected the country rocks, as well, and are attributed to the action of postmagmatic solutions. The concentration of rare nietal minerals is closely related to the activity of such solutions. —R.C. Epis