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Potassium-argon ages from Tristan da Cunha, South Atlantic

  • Ian McDougall (a1) and C. D. Ollier (a2)

Summary

Potassium-argon ages measured on 11 volcanic rocks, mainly lavas, from Tristan da Cunha range from 0.21 ± 0.01 to 0.01 ± 0.02 Ma, and confirm the youthfulness of this volcano, which lies on the Walvis Ridge just to the east of the crest of the Mid Atlantic Ridge.

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References

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Baker, P. E., Gass, I. G., Harris, P. G. & Le Maitre, R. W. 1964. The volcanological report of the Royal Society Expedition to Tristan da Cunha, 1962. Phil. Trans. R. Soc. A 256, 439578.
Creer, K. M. 1964. Palaeomagnetic measurements on lavas from Tristan and Inaccessible Island. Appendix III in The volcanological report of the Royal Society Expedition to Tristan da Cunha, 1962. Phil. Trans. R. Soc. A 256, 569–73.
Dingle, R. V. & Simpson, E. S. W. 1976. The Walvis Ridge: a review. In Geodynamics: Progress and Prospects (ed. Drake, C. L.), pp. 160–76. Washington: Amer. Geophys. Union.
Dunne, J. C. 1941. Volcanology of the Tristan da Cunha Group: Results of the Norwegian Scientific Expedition to Tristan da Cunha, 1937–1938. Norske Videnskaps Akademi, Oslo 2, 1145.
Gass, I. G. 1967. Geochronology of the Tristan da Cunha group of islands. Geol. Mag. 104, 160–70.
Ladd, J. W., Dickson, G. O. & Pitman, W. C. III. 1973. The age of the South Atlantic. In The Ocean Basins and Margins (ed. Nairn, A. E. M. and Stehli, F. G.), pp. 555–73. New York, London: Plenum Press.
McDougall, I. 1964. Potassium-argon ages from lavas of the Hawaiian Islands. Bull. geol. Soc. Amer. 75, 107–28.
McDougall, I. & Duncan, R. A. 1980. Linear volcanic chains – recording plate motions? Tectonophys. 63, 275–95.
McDougall, I., Polach, H. A. & Stipp, J. J. 1969. Excess radiogenic argon in young subaerial basalts from the Auckland volcanic field, New Zealand. Geochim. cosmochim. Acta 33, 1485–520.
McDougall, I. & Schmincke, H.-U. 1977. Geochronology of Gran Canaria, Canary Islands: age of shield building volcanism and other magmatic phases. Bull. Volcanol. 40, 5777.
Miller, J. A. 1964. Age determinations made on samples of basalt from the Tristan da Cunha group and other parts of the mid-Atlantic ridge. Appendix II in The volcanological report of the Royal Society Expedition to Tristan da Cunha, 1962. Phil. Trans. R. Soc. A 256, 565–9.

Potassium-argon ages from Tristan da Cunha, South Atlantic

  • Ian McDougall (a1) and C. D. Ollier (a2)

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