Abstract
TWENTY-ONE miles east of Gombe in northern Nigeria, one of the numerous Tertiary–Quaternary olivine basalt plugs of the Benue trough alkaline volcanic province1 contains many conspicuous sub-rectangular white feldspar crystals, 1–3 cm long. The olivine basalt is a normal alkaline variety, quite fresh, with phenocryst and microphenocryst olivine (close to Fa25), titaniferous augite and titanomagnetite. Moderately zoned plagioclase microphenocrysts have labradoritic compositions (An54–62).
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References
Carter, J. D., Barber, W., and Tait, E. A., Geol. Survey Nigeria, Bull. No. 30, (1963).
Green, T. H., Dept. Geophys. Geochem. ANU Pub. No. 444, 206 (1966).
Kuno, H., Adv. Front. Geol. Geophys., 205 (Hyderabad, 1964).
Green, D. H., and Ringwood, A. E., Contr. Mineral. Petrol., 15, 103 (1967).
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WRIGHT, J. Deep Crustal Origin for Oligoclase and Andesine Phenocrysts in Basalt from Gombe, Nigeria. Nature 218, 262–263 (1968). https://doi.org/10.1038/218262b0
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DOI: https://doi.org/10.1038/218262b0
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