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Torres, P., Silva, L.C., Munha, J., Caldeira, L., Mata, J. and Tassinari, C. (2010) Petrology and Geochemistry of Lavas from Sal Island: Implications for the Variability of the Cape Verde Magmatism. Cominucacoes Geologicas, 97, 35-62.

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• TITLE: The Geodynamic Context of the Cenozoic Volcanism of the Cap-Vert Peninsula (Senegal)

  AUTHORS: Abdoulaye Ndiaye, Papa Malick Ngom

  KEYWORDS: Cenozoic, Alkaline Volcanism, Oceanic Islands Basalts, Cap-Vert Peninsula, Senegalo-Mauritania Basin

  JOURNAL NAME: International Journal of Geosciences, Vol.5 No.12, November 27, 2014

  ABSTRACT: The Cenozoic alkaline volcanism of the Senegalo-Mauritania sedimentary basin presents an episodic long-lasting volcanic activity from the Eocene-Oligocene boundary up to the Quaternary. Two volcanic episodes are usually distinguished on stratigraphical grounds: a Miocene one and a Quaternary one separated by a period of quiescence of several million years corresponding to the main phase of lateritic weathering. The Tertiary lavas are highly silica-undersaturated alkaline rocks ranging from nephelinites to basanites. They contain nepheline and fassaite-type clinopyroxene in their mineralogy. The Quaternary lavas are more evolved with Hy-normative in comparison to the Tertiary ones; they are composed of basanites and medium to coarser-grained dolerites. The distribution of the REE and other incompatible elements are typical of alkaline lavas with generally strong LREE enrichment without significant Eu anomaly. The Cenozoic Cap-Vert lavas have OIB (oceanic islands basalts)-affinities as shown by their relatively radiogenic Nd and unradiogenic Sr characters closed to the HIMU-OIB. This suggests a HIMU-type end member in the magma sources which is fairly comparable to those erupted in the Canaries and Cape Verde archipelagoes during the same period.