Here is one example of an isochron, based on measurements of basaltic meteorites (in this case the resulting date is 4.4 billion years) [Basaltic1981, pg. Skeptics of old-earth geology make great hay of these examples.
For example, creationist writer Henry Morris [Morris2000, pg.
In a related article on geologic ages (Ages), we presented a chart with the various geologic eras and their ages.
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Radioactive elements, such as rubidium-87 (but not strontium-86 or strontium-87), decay over time.
By evaluating the concentrations of all of these isotopes in a rock sample, scientists can determine what its original make-up of strontium and rubidium were.
This function is able to tell researchers how old a sample is. But there's a wrinkle in the process that has been overlooked.
The ratios of strontium-86 to rubidium and strontium-87 are thought to only be influenced by the radioactive decay of the rubidium-87 into strontium-87.
"If we don't account for differential mass diffusion, we really have no idea how accurate a radioisotope date actually is.