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Age Determinations on Feldspar from the Lower Omo Basin

Naturevolume 222page1143 (1969) | Download Citation



Total degassing 40Ar/39Ar age determinations have been made on a concentrate of fresh feldspar from lapilli in a pumice–lapilli-tuff of the Nkalabong Fm., Lower Omo Basin, Ethiopia.

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  1. 1

    Mitchell, J. G., Geochim. Cosmochim. Acta, 32, 781 (1968).

  2. 2

    Dunham, K. C., Fitch, J. F., Ineson, P. R., Miller, J. A., and Mitchell, J. G., Proc. Roy. Soc. A, 307, 251 (1968).

  3. 3

    Fitch, F. J., Miller, J. A., and Mitchell, J. G., Data for Orogenic Studies, 1 (edit. by Spencer, A.) (Geological Society, London, 1969, in the press).

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  1. Birkbeck College, University of London

    • F. J. FITCH
  2. Department of Geodesy and Geophysics, University of Cambridge

    • J. A. MILLER


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