Alkaline Rocks and Carbonatites of the World

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Arakaou (Arakao)

stripes

Occurrence number: 
121-00-008
Country: 
Niger
Location: 
Longitude: 9.6, Latitude: 18.95

This 20 km wide pluton has eroded to form a depression. According to Black et al. (1967) the periphery consists of a biotite-rich granite which at the outer margin is overlain sub-horizontally by arkoses. Moreau (1987) indicates the presence of peralkaline granites and syenites.

References: 
BLACK, R., JAUJOU, M. and PELLATON, C. 1967. Notice explicative sur la carte geologique de l'Air à l'échelle du 1/500 000. Direction des Mines et de la Geologie. Republique du Niger, 1-57.MOREAU, C. 1987. Les complexes anorogéniques à suite anorthositique de l'Aïr (Niger): contribution à l'étude des anorthosites. Bulletin de la Société Géologique de France, 8(3): 115-22.
Location: 
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith