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Comparative Uranium and Thorium Analyses of Basic and Ultra-basic Rocks

Naturevolume 199pages479480 (1963) | Download Citation



RECENTLY a number of new analyses using neutron activation and isotope dilution techniques have been reported for uranium and thorium in certain basic rocks (that is, eclogites) and ultra-basic rocks (that is, peridotites and dunites) which are variously considered to represent materials forming the Earth's upper mantle1,2. In view of the significance of these results with respect to the radioactive generation of heat in the upper mantle, it is of some importance to establish the interrelation of the results reported by the various workers interested in the problem of the determination of low-level uranium and thorium abundances in rocks.

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  1. 1

    Lovering, J. F., and Morgan, J. W., Nature, 197, 138 (1963).

  2. 2

    Tilton, G. R., and Reed, G. W., in Earth Science and Meteorites (North Holland Pub. Co., 1963).

  3. 3

    Hamaguchi, H., Reed, G. W., and Turkevich, A., Geochim. Cosmochim. Acta, 12, 337 (1957).

  4. 4

    Tilton, G. R., Carnegie Inst. Wash. Year Book 55, 167 (1956).

  5. 5

    Morgan, J. W., and Lovering, J. F. (in the press).

  6. 6

    Ross, C. S., Foster, M. D., and Myers, A. T., Amer. Mineral., 39, 693 (1954).

  7. 7

    Hess, H. H., Geol. Soc. Amer., Spec. Paper 62, 391 (1955).

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  1. Department of Geophysics, Australian National University, Canberra

    • J. F. LOVERING
    •  & J. W. MORGAN


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