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Concordia dating is a form of Uranium/Lead dating the uses a concordia diagram like the one above. The theory is that when zircons crystallize that they loose all of their lead and so that as long as the crystal reaming closed it Lead/Uranium ratios should follow the above chart.
It is further theorized that sense all isotopes of the same element are chemically identical that they should be removed in proportional amounts, forming a strait line on the concordia diagram, that crosses the concordia curve at both the crystallization and the contamination date. Loss of Uranium moves the point up and to the right, while a loss of lead moves the point down and to the left.
In reality you don't always get a nice need line showing that reality is more complicated than this than indicated by the theory. Furthermore contamination can total reset the "clock" providing a way to explain data that does not fit the theory.
For Concordia dating the samples must have both the crystallization and the contamination dates, this provides yet another way to explain data that does not fit the theory.
Concordia dating is based one the following assumptions.
All lead is removed from zircons when they crystallize, such that there are no daughter isotopes present in the original sample. If zircons cooled and crystallized faster than the are thought to have, then then could have had original lead, and that would throw off the enter process.
All isotopes of the same element are removed in proportional amounts, however since lighter isotopes move faster, than heavier ones at a given temperature, there would be a tendency for lighter isotopes to be removed a little faster
That the decay rates are constant, but there is evidence of accelerated decay in the past.
Above is a concordia diagram is based on accelerated decay and Biblical creation. While it is not a precise diagram, it illustrates the basic affect that accelerated decay and Biblical creation would have on concordia dating.
Given concordia dating's questionable assumptions and the ability of the theory to explain dates that don't fit the theory, it is reasonable to conclude that concordia dating is not reliable as it is claimed to be.
The age of Australian uranium
Geol. 655 Isotope Geochemistry
Mythology of Modern Dating Methods
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