International Journal of Geosciences

Volume 5, Issue 12 (November 2014)

ISSN Print: 2156-8359   ISSN Online: 2156-8367

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

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DOI: 10.4236/ijg.2014.512124    4,450 Downloads   5,293 Views  

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.

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Ndiaye, A. and Ngom, P. (2014) The Geodynamic Context of the Cenozoic Volcanism of the Cap-Vert Peninsula (Senegal). International Journal of Geosciences, 5, 1521-1539. doi: 10.4236/ijg.2014.512124.

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