Source-Rock of Lead Ores and the Age of the Granitic Layer

Details Source-Rock of Lead Ores and the Age of the Granitic Layer Source-Rock of Lead Ores and the Age of the Granitic Layer

Jul 1949

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1949natur.164...72v&link_type=abstract

Nature, Volume 164, Issue 4158, pp. 72 (1949).

Computer Science

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Scientific paper

IT has been pointed out by Holmes1 that most lead ores seem to have originated from a common source in which the products of radioactive decay of uranium have been accumulating continuously since time t0 (3,350 million years ago). The ratio Pb/U of total lead to uranium-238 in this source-rock at the present time would be about 7.5, a value which seems to fit almost any kind of material, sialic, basaltic or meteoritic (excluding troilite and iron meteorites). Because of the special association of lead ores with granitic rocks, Holmes favours the view that the source-rock of these ores must be granitic in composition, so that t0 would really be the age of the sial. Since Jeffreys has shown that solidification of the earth would probably require no more than 15,000 years, the age of this granitic layer would, according to Holmes, not be appreciably different from the age of the earth itself.

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