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Deep Crustal Origin for Oligoclase and Andesine Phenocrysts in Basalt from Gombe, Nigeria

Nature volume 218, pages 262–263 (1968)Cite this article

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

  1. Carter, J. D., Barber, W., and Tait, E. A., Geol. Survey Nigeria, Bull. No. 30, (1963).

  2. Green, T. H., Dept. Geophys. Geochem. ANU Pub. No. 444, 206 (1966).

  3. Kuno, H., Adv. Front. Geol. Geophys., 205 (Hyderabad, 1964).

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  4. Green, D. H., and Ringwood, A. E., Contr. Mineral. Petrol., 15, 103 (1967).

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Authors and Affiliations

  1. Department of Geology, Ahmadu Bello University, Zaria, Nigeria

    J. B. WRIGHT

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  1. J. B. WRIGHT
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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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