Radiocarbon, or Carbon-14, dating is probably one of the most widely used and best known absolute dating methods.
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I did see in one reference the statement that some parent-to-daughter ratio yielded more accurate dates than isochrons. (1) Since carbon dating measures the amount of carbon still in a fossil, then the date given is not accurate.
In many instances the melt which has migrated from the initial magma chamber will undergo further segregation.
It is better in that an individual bristlecone pine can live for 2,000 years.
And it s not clear to me in any case that just because an isochron gives evidence that it _could_ have been produced by a mixing of two sources, that it would always be discarded.
We have gold appearing pure at times, silver pure at times, dating for house wives in nairobi.. Carbon dating is based on the assumption that the amount of C14 in the atmosphere has always been the same.
They have the same ratio of carbon-14 to carbon-12 as the atmosphere, and this same ratio is then carried up the food chain all the way to apex predators, like sharks.