Alkaline Rocks and Carbonatites of the World

Setup during HiTech AlkCarb: an online database of alkaline rock and carbonatite occurrences

Bioko (Fernando Poo, Macias Nguema Biyogo)


Occurrence number: 
Equatorial Guinea
Longitude: 8.67, Latitude: 3.5

Age A K-Ar age of 1.1 Ma was obtained by Hedberg (1968 - quoted in Fitton, 1987) from a sample of basanite. Piper and Richardson (1972), based on numerous palaeomagnetic measurements, concluded that the whole island is younger than 0.7 Ma.


BALLENTINE, C.J., LEE, D.-C. and HALLIDAY, A.N. 1997. Hafnium isotopic studies of the Cameroon line and new HIMU paradoxes. Chemical Geology, 139: 111-24.DERUELLE, B., MOREAU, C., NKOUMBOU, C., KAMBOU, R., LISSOM, J., NJONFANG, E., GHOGOMU, R.T. and NONO, A. 1991. The Cameroon Line: a review. In A.B. Kampunzu and R.T. Lubala (eds), Magmatism in extensional structural settings. 274-327. Springer-Verlag, Berlin.FITTON, J.G. 1987. The Cameroon line, West Africa: a comparison between oceanic and continental alkaline volcanism. In J.G. Fitton and B.G.J. Upton (eds), Alkaline igneous rocks. 273-91. Geological Society of London Special Publication 30.HALLIDAY, A.N., DICKIN, A.P., FALLICK, A.E. and FITTON, J.G. 1988. Mantle dynamics: a Nd, Sr, Pb and O isotopic study of the Cameroon Line volcanic chain. Journal of Petrology, 29: 181-211.MITCHELL-THOME, R.C. 1970. Geology of the south Atlantic islands. Beitrage zur Regionalen Geologie der Erde, 10. Gebruder Borntraeger, Berlin. 367 pp.PIPER, J.D.A. and RICHARDSON, A. 1972. The palaeomagnetism of the Gulf of Guinea volcanic province, West Africa. The Geophysical Journal of the Royal Astronomical Society, 29: 147-71.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith