Petrology of the Volcanic Rocks from Bioko Island (“Cameroon Hot Line”) - International Journal of Geosciences

IJG > Vol.6 No.3, March 2015

International Journal of Geosciences

Volume 6, Issue 3 (March 2015)

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

Google-based Impact Factor: 0.56 Citations h5-index & Ranking

Petrology of the Volcanic Rocks from Bioko Island (“Cameroon Hot Line”) ()

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Download as PDF (Size: 3292KB) PP. 247-255

DOI: 10.4236/ijg.2015.63019 3,057 Downloads 4,250 Views Citations

Author(s)

Fadimatou Ngounouno Yamgouot^1*, Bernard Déruelle², Isaac Bertrand Gambie Mbowou³, Ismaïla Ngounouno³

Affiliation(s)

¹Département des Sciences de la Terre, Faculté des Sciences, Université de Ngaoundéré, Ngaoundéré, Cameroun.
²Laboratoire de Magmatologie et Géochimie Inorganique et Expérimentale (MAGIE), Institut de Physique du Globe de Paris, Université Pierre et Marie Curie, Paris, France.
³Département des Mines et de la Géologie, Ecole de Géologie et d’Exploitation Minière (EGEM), Université de Ngaoundéré, Meiganga, Cameroun.

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 < Mg# < 0.87) and diopside ± Ti-augite. Plagioclase (An_62-67Ab_35-32Or_3-1) 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.

KEYWORDS

Petrology, Geochemistry, Lavas, Bioko, Cameroon Hot Line

Share and Cite:

Yamgouot, F. , Déruelle, B. , Mbowou, I. and Ngounouno, I. (2015) Petrology of the Volcanic Rocks from Bioko Island (“Cameroon Hot Line”). International Journal of Geosciences, 6, 247-255. doi: 10.4236/ijg.2015.63019.

Cited by

[1]	Petrological and Geochemical Studies on the Si-Undersaturated Rocks of the Mount Cameroon: Genesis of the Camptonite and Nephelinite at the Cameroon …
	2021

[2]	New Petrological and Geochemical Data of the Nephelinitic Lavas and Geodynamic Implications of Mount Etinde (Cameroon)
	2016

[3]	Geochemistry of the volcanic rocks from Bioko Island (“Cameroon Hot Line”): Evidence for plume-lithosphere interaction
	Geoscience Frontiers, 2015

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