Abstract
Bioko island (3008 m a.s.l.), is composed of the alkaline basaltic lavas (basalts and hawaiites) with xenoliths. These lavas have a microlitic textureand consisted of euhedral to subhedral phenocrysts (>1 mm) of olivine (0.83 62-67Ab35-32Or3-1) phenocrysts are present only in hawaiites. In Harker diagrams, SiO2, Al2O3, Na2O and K2O contents of the lavas increase and Fe2O3, MgO and CaO decrease with increasing differentiation from basalts to hawaiites. The compatible elements Ni, Cr and V decrease strongly in basalts and remain at low levels in hawaiites. Basaltic lavas from Bioko lavas have low Hf contents (4.2 - 9.2 ppm) and consequently higher Hf/Zr ratios (50 - 90) than those (<50) of similar lavas from other volcanoes of the Cameroon Hot Line. Such high ratios are commonly observed in alkaline basaltic lavas associated with carbonatitic and/or nephelinitic magmatism. The Sr and Nd isotopic compositions point to a slightly depleted mantle source.
Highlights
Bioko Island is the northernmost island of the oceanic sector of the Cameroon HotHow to cite this paper: Yamgouot, F.N., Déruelle, B., Mbowou, I.B.G. and Ngounouno, I. (2015) Petrology of the Volcanic Rocks from Bioko Island (“Cameroon Hot Line”)
The three volcanoes of Bioko Island only emitted basaltic lavas; this is to what is observed on the nearby Mt Cameroon
Mt Etinde which is located at the very shore of the continent between Bioko and Mt Cameroon only consists of nephelinitic lavas which are completely unknown on the other volcanoes
Summary
Bioko Island (formerly Fernando Poo) is the northernmost island of the oceanic sector of the Cameroon HotHow to cite this paper: Yamgouot, F.N., Déruelle, B., Mbowou, I.B.G. and Ngounouno, I. (2015) Petrology of the Volcanic Rocks from Bioko Island (“Cameroon Hot Line”). Bioko Island (formerly Fernando Poo) is the northernmost island of the oceanic sector of the Cameroon Hot. How to cite this paper: Yamgouot, F.N., Déruelle, B., Mbowou, I.B.G. and Ngounouno, I. (2015) Petrology of the Volcanic Rocks from Bioko Island (“Cameroon Hot Line”). The published ages of these volcanoes are all younger than 1.33 ± 0.07 Ma [1]-[3]. Paleomagnetic data yield ages younger than 0.7 Ma [1]. It is probable that the Bioko ages are similar to those of Mt Cameroon [4]. The objectives of this paper are to present new mineralogical and geochemical data for volcanic rocks from Bioko Island, in order to compare it to others volcanic rocks from the Cameroon Hot Line
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