Abstract
IN two earlier communications on this subject1,2 I directed attention to the bearing on geological time and geochemical problems of Clarke and Steiger's determination of lead in a composite sample of 329 igneous rocks. The amount of lead found by these analysts was 7.5 × 10â6 gm. per gm. Adopting this result as the best then available, and combining it with other data, such as tho uranium and thorium contents of rocks and the atomic weights of lead from different sources, I pointed out that the following inferences could bo drawn:
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References
NATURE, 117, 482, April 3, 1926.
NATURE, 124, 477, Sept. 28. 1929.
Trans. Nat. Hist. Soc., Northumberland, Durham, and Newcastle-upon-Tyne, p. 32; 1930.
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HOLMES, A. Lead Content of Rocks. Nature 128, 1039–1040 (1931). https://doi.org/10.1038/1281039a0
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DOI: https://doi.org/10.1038/1281039a0
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