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Ridley, W.I. and Baker, I. (1973) The Petrochemistry of a Unique Cordierite-Bearing Lava from St. Helena Island, South Atlantic. American Mineralogist, 58, 813-818.

has been cited by the following article:

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

  AUTHORS: Fadimatou Ngounouno Yamgouot, Bernard Déruelle, Isaac Bertrand Gambie Mbowou, Ismaïla Ngounouno

  KEYWORDS: Petrology, Geochemistry, Lavas, Bioko, Cameroon Hot Line

  JOURNAL NAME: International Journal of Geosciences, Vol.6 No.3, March 25, 2015

  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 (