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Book Chapter

Fundamental sources of uranium and thorium

January 01, 1977


Global Distribution of Uranium and Thorium

The three quantitatively significant natural radioéléments are, in order of decreasing abundance, potassium, thorium, and uranium. All the isotopes of thorium and uranium are radioactive, but K40 (0.0118% of all K) is the only radioactive isotope of potassium. The true average and specific lithologie abundances of radioéléments throughout the earth may never be learned from direct measurement, but these elements have been measured extensively at the surface and interpreted for the interior from indirect evidence. The three sources of data are:

  1. 1.

    Chemical and radiometric analysis of meteorites interpreted to be representative of different earth layers;

  2. 2.

    Chemical and radiometric analysis of surficial rocks; and

  3. 3.

    Estimation of values for the earth’s interior from heat-flow and rock-conductivity data.

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AAPG Studies in Geology

Migration of Uranium and Thorium-Exploration Significance

John W. Gabelman
John W. Gabelman
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American Association of Petroleum Geologists
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Publication date:
January 01, 1977




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