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Fission-track dating of pumice from the KBS Tuff, East Rudolf, Kenya

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Abstract

Fission-track dating of zircon separated from two pumice samples from the KBS Tuff in the Koobi Fora Formation, in Area 131, East Rudolf, Kenya, gives an age of 2.44±0.08 Myr for the eruption of the pumice. This result is compatible with the previously published K–Ar and 40Ar/39Ar age spectrum estimate of 2.61±0.26 Myr for the KBS Tuff in Area 105, but differs from the more recently published K–Ar date of 1.82±0.04 Myr for the KBS Tuff in Area 131. This study does not support the suggestion that pumice cobbles of different ages occur in the KBS Tuff.

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Author notes

  1. A. J. W. Gleadow

    Present address: Department of Geology, School of Earth Sciences, University of Melbourne, Parkville, Victoria, Australia

Authors and Affiliations

  1. Department of Geology, Birkbeck College, University of London, 7/15 Gresse Street, London, W1P 1PA, UK

    Anthony J. Hurford

  2. US Geological Survey, Federal Center, Denver, Colorado, 80225

    C. W. Naeser

Authors
  1. Anthony J. Hurford
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  2. A. J. W. Gleadow
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  3. C. W. Naeser
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Hurford, A., Gleadow, A. & Naeser, C. Fission-track dating of pumice from the KBS Tuff, East Rudolf, Kenya. Nature 263, 738–740 (1976). https://doi.org/10.1038/263738a0

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  • DOI: https://doi.org/10.1038/263738a0

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