stripes
Occurrence number:
025-00-031
Country:
Brazil
Region:
Ceara
Location:
Longitude: -40.5, Latitude: -6.33
Carbonatite:
No
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. Associated peralkaline dykes are very numerous, particularly in the gneiss terrain to the north, and contain aegirine, riebeckite and arfvedsonite. Very little information is available.
Age:
Probably 'Brazilian' by correlation with dated granites and dykes further north (Sa, 1981).
References:
SA, E.F.J, de, 1981. A orogenese Brasiliana e suas relacoes com faixas supracrustais no sudoeste do Ceara. Atas do X Simposio de Geologia do Nordeste. Recife: 337-50
Location: