Abstract
A Nigerian alkaline basalt containing large phenocrysts of plagioclase feldspars1,2 and comprising one of the numerous Tertiary-Quaternary plugs of the Benue Trough province is a fine grained, subaerial rock which seems to be suitable for whole rock K-Ar dating. The age obtained, however, 95 m.y. (Table 1), is geologically unrealistic, for absence of sediment cover, the freshness of the rock and the ages of associated rocks all point to a late Tertiary origin2.
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References
Wright, J. B., Nature, 218, 262 (1968).
Wright, J. B., Mineral Mag., 36, 1024 (1968).
McDougall, I., Geochim. Cosmochim. Acta, 35, 361 (1971).
Dalrymple, G. B., Earth Planet. Sci. Lett., 6, 47 (1969).
Funkhouser, J. G., Fisher, D. E., and Bonatti, E., Earth Planet. Sci. Lett., 5, 95 (1968).
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FISHER, D. Excess Rare Gases in a Subaerial Basalt from Nigeria. Nature Physical Science 232, 60–61 (1971). https://doi.org/10.1038/physci232060a0
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DOI: https://doi.org/10.1038/physci232060a0
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