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The difficulties with single-stage systems can be circumnavigated with multi-stage systems.Though multi-stage lead samples cannot be used for generating isochrons, they can be used to produce valuable information through concordia-discordia plots.

The first is that it requires single-stage leads, which are systems that begin at some initial lead composition and remain on the same growth curve throughout their histories (Dalrymple 209).

The second requirement is that assumptions about the genetic relationship between the Earth and meteorites must be made.

The use of lead isotope ratios makes this isochron self-checking.

A large scattering of measurements would indicate the sample is multi-stage rather than single-stage, making the isochron unreliable.

This model, which describes the accumulation of lead isotopes in meteorites, the Earth, and the Solar System, was proposed independently by E. The amount of 204Pb will remain constant throughout the history of a rock because it is a stable isotope that is not the product of any decay series, thus allowing for the normalization (Dalrymple 201-163).

Last modified 13-Oct-2019 15:28