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).
Similar content being viewed by others
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).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
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
Received:
Issue Date:
DOI: https://doi.org/10.1038/218262b0
- Springer Nature Limited
This article is cited by
-
Tholeiitic basalt magmatism of Mount Etna and its relations with the alkaline series
Contributions to Mineralogy and Petrology (1978)
-
K/Ar Data and the Origin of Feldspar Megacrysts in Basalt: Rejoinder to J. B. Wright
Nature Physical Science (1972)
-
K/Ar Data and the Origin of Feldspar Megacrysts in Alkali Basalt
Nature Physical Science (1972)
-
Excess Rare Gases in a Subaerial Basalt from Nigeria
Nature Physical Science (1971)
-
Mafic and ultramafic inclusions associated with undersaturated basalt on Kod Ali Island, Southern Red Sea
Contributions to Mineralogy and Petrology (1971)