Suitable protoliths for the alaskites are neither the granitic basement nor the arkosic Etusis Formation nor metasediments of the Kuiseb Formation. Derivation from Khan Formation metasediments or acidic lavas like those of the Naaupoort type is suggested by the Rb/Sr data. Two red granites could also stem from such sources whereas a third one was perhaps produced from Etusis metasediments.