The metallic deposits of the Akjoujt region in Mauritania, French West Africa, are syntectonic and represent a special type of high-temperature mineralization. Without noticeable break, the mineralization consists on the one hand of a rich paragenetic sequence of minerals derived from basic rocks, which had been mobilized and concentrated by metasomatism associated with migmatization, and on the other of a pneumatolytic paragenetic sequence of acid pegmatite character, apparently derived from the migmatites themselves. The Guelb Moghrein and Tabrinkout deposits represent the end members of this mineralization, the former related mainly to the migmatites, the latter to the pegmatites.

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