Retrieved January 12, from Encyclopedia. Then, copy and paste the text into your bibliography or works cited list. Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia. Another method of calculating the age of the rocks is to measure the ratio of radiogenic lead Pb, Pb, and Pb present to nonradiogenic lead Pb.
A method for dating small amounts of uranium|INIS
These methods give reliable results for ages of the order 10 7 —10 9 years. Print this article Print all entries for this topic Cite this article. The Earth can be assumed to be a very large sample containing lead evolving from primordial lead by radiogenic increments. If modern lead, for example, from marine sediments or modern basalts has the composition of lead in the Earth and if the lead in the troilite phase of iron meteorites has the composition of primordial lead, then a simple model yields about 4.
This age is in good agreement with the age of the meteorites and the age of the Moon as determined independently.
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