Abstract
IN an earlier communication to NATURE (April 3, 1926, p. 482), I attempted to show that of the lead dispersed through igneous rocks, roughly one-half is of radioactive origin. The atomic weight of the lead of radioactive origin can be evaluated from the proportions of uranium and thorium in rocks, taking the rate of generation of lead by thorium as 0.38 times its rate of production by uranium. The following table (compiled mainly from determinations by Joly and his collaborators) covers a sufficiently wide and representative range of data for our purpose.
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HOLMES, A. Ore-lead and Rock-lead and the Origin of certain Ore Deposits. Nature 124, 477–478 (1929). https://doi.org/10.1038/124477a0
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DOI: https://doi.org/10.1038/124477a0
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