stripes
The Tiguesmat peralkaline granite intrusion is approximately 10x10 km; a smaller peralkaline granite is located 15 km to the southeast. The rock is variably fine- to coarse-grained and consists of quartz, microcline perthite, with a little aegirine, riebeckite and biotite; there is accessory fluorite, astrophyllite, titanite and allanite.
BESSOLES, B. 1977. Géologie de l'Afrique: Le craton ouest Africain. Mémoires du Bureau de Recherches Géologiques et Minières, 88: 1-403.CAHEN, L., SNELLING, N.J., DELHAL, J. and VAIL, J.R. 1984. The geochronology and evolution of Africa. Clarendon Press, Oxford. 512 pp.CARTE GEOLOGIQUE de la dorsale regueibat et de ses bordures sedimentaires (Partie orientale). Republique Islamique de Mauritanie. 1974. Nations Unies. MAU-69-504. 1:500,000.