Alkaline Rocks and Carbonatites of the World

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Ouin (Petite Suisse)


Occurrence number: 
Burkina Faso
Longitude: -1, Latitude: 12.33

This 17x7 km intrusion of peralkaline syenite is emplaced in basement migmatites. The rock comprises microcline perthite, albite, aegirine-augite, a little biotite and accessory zircon, apatite, titanite and fluorite. A modal and chemical analysis is in Ducellier (1963, p. 263), this rock apparently containing a little katophorite.

DUCELLIER, J. 1963. Contribution a l'étude des formations cristallines et métamorphiques du centre et du nord de la Haute-Volta. Mémoires du Bureau de Recherches Géologiques et Minières, Paris, 10: 1-320.
Fig. 3_22 Yabo, Sadba, Ouin and Zoungou. Other post-tectonic, non-alkaline granites are also shown (after Ducellier, 1963, Carte Ouagadougou Sud).
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