Perambu is a peralkaline granite intrusion which cuts Precambrian gneisses and migmatites along its northern margin, but in the south is in contact with molasse-type sediments and associated volcanics. The granite contains biotite, aegirine and a little riebeckite.
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An alkaline province consisting of a number of necks (Pao deAcucar, Salgadinho, Japarara), plugs (Ancuri, Gangorra, Pocao), a dome (Cararu), a concentric structure (Preto) and an associated suite of dykes is situated in the Fortaleza area.