Abstract
The late Tertiary volcanism from the volcanic province of Cap Verde Peninsula includes only silica-undersaturated basic lavas: olivine nephelinites, basanites and olivine alkaline basalts. This undersaturated alkaline series is sodic and indifferentiated. Lavas contain olivine Fo 88 to Fo 56, clinopyroxene Wo 54En 34Fs 12 (fassaïte) to Wo 40En 42Fs 18 (augite) present both in phenocrysts and in groundmass. Plagioclase An 67An 48 is only found in basanites and olivine alkaline basalts. The olivine nephelinite is characterized by a soda-rich nepheline (Ne 77Ks 16Q 7). Microphenocrysts of iron-titanium oxides may form within the more differentiated lavas of the series.
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