Alkaline Rocks and Carbonatites of the World

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Adiounedj (Adiounedj)


Occurrence number: 
Longitude: 0.07, Latitude: 20.18

The major rock type of this very irregular complex is fenite with a substantial area of rodbergite and lesser areas of foid syenite and carbonatite (Sauvage and Savard, 1985). Dykes are numerous and widespread. The foid syenites contain perthite, abundant primary cancrinite, sodalite, aegirine-augite with salitic cores, and accessory titanite, apatite, fluorite and calcite. The carbonatites, which form small plugs and dykes, include sovites and calcite carbonatites rich in iron and manganese oxides and barite, as well as ferrocarbonatites. Fluorite and apatite are present and in the plugs synchysite and a little pyrochlore have been identified. There are numerous dykes of fluorite. No description of the fenites appears to be available, nor of the rodbergites which are, presumably, rocks of carbonate and hematite.

SAUVAGE, J.-F. and SAVARD, R. 1985. Les complexes alcalins sous-saturés à carbonatites de la région d'In Imanal (Sahara malien): une presentation. Journal of African Earth Sciences, 3:143-9.
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