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To me it has been a real eye opener to see all the processes that are taking place and their potential influence on radiometric dating.
Radiometric dating is largely done on rock that has formed from solidified lava.
Such processes can cause the daughter product to be enriched relative to the parent, which would make the rock look older, or cause the parent to be enriched relative to the daughter, which would make the rock look younger.
This calls the whole radiometric dating scheme into serious question.
But at the same time, it will be enriched in the elements contained in the later forming minerals, namely sodium and potassium.
Further, the silicon content of the melt becomes enriched toward the latter stages of crystallization.
The following quote from The Earth: An Introduction to Physical Geology by Tarbuck & Lutgens, pp.
Although these minerals crystallize in the order shown, this sequence is not a true reaction series.As the crystallization process continues, the composition of the melt (liquid portion of a magma, excluding any solid material continually changes.