Uranium-Lead dating is a radiometric dating method that uses the decay chain of uranium and lead to find the age of a rock. Uranium — Lead dating is the geological age-determination method that uses the radioactive decay of uranium U isotopes U, U, and also in this entry Th into stable isotopes of lead Pb Pb, Pb, and Pb, respectively. Of all the isotopic dating methods in use today, the uranium-lead method is the oldest and, when done carefully, the most reliable. All naturally occurring uranium contains U and U in the ratio Comparisons between the observed abundance of certain naturally occurring radioactive isotopes and their decay products, using known decay rates, can be used to measure timescales ranging from before the birth of the Earth to the present.
It is normally assumed that in any small part of the Earth's crust and underlying mantle which, at the time of formation, contained primordial lead together with uranium and thorium, no radiogenic lead could have been present. Here I want to concentrate on another source of error, namely, processes that take place within magma chambers. Lead—lead dating is a method for dating geological samples, normally based on 'whole-rock' samples of material such as granite. A dating method based on the comparison of isotopes of lead Pb. The radiometric evidence for a 4.
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