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Basaltic flows and thirty-five plugs of felsic alkaline volcanic rocks (phonolites and trachytes) of Mio-Pliocene age are exposed to the north and east of Ngaoundéré (Adamawa, Cameroon). The series is composed of alkaline basalts, hawaiites, mugearites, benmoreites, phonolites, and trachytes. Despite the gap between basaltic and felsic lavas, major- and trace-element distributions are in favour of...
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