Radiometric dating is largely done on rock that has formed from solidified lava. So the question is what the melting points of its oxides or salts would be, I suppose. If this is so, the magma would initially be poor in thorium and uranium and rich in lead, and as it cooled it would become rich in thorium and uranium and poor in lead. They assume that initially the magma was well mixed to assure an even concentration of lead isotopes, but that uranium or thorium were unevenly distributed initially.
In the course of partial melting and fractional crystallization of magma, U and Th are concentrated in the liquid phase and become incorporated into the more silica-rich products. If minerals that crystallize at the top of a magma chamber and fall, tend to incorporate a lot of uranium, this will tend to deplete uranium at the top of the magma chamber, and make the magma there look older. Another point is that of time. Further, Faure explains that uraninite UO sub2 is a component of igneous rocks Faure, p. So this implies some kind of chemical fractionation. There is also evidence that many anomalies are never reported. This mechanism was suggested by Jon Covey and others. Radioactive decay of years old? The condition that one of the sources have no P, D, or N is fairly natural, I think, because of the various fractionations that can produce very different kinds of magma, and because of crustal materials of various kinds melting and entering the magma. He then noted that the whole flow probably occured and solidified the surface at least within weeks. Most people are not aware of the many processes that take place in lava before it erupts and as it solidifies, processes that can have a tremendous influence on daughter to parent ratios. Archaeologists use their formulas. Sialic granitic and mafic basaltic magma are separated from each other, with uranium and thorium chemically predestined to reside mainly in sialic magma and less in mafic rock. Although these minerals crystallize in the order shown, this sequence is not a true reaction series. Let us consider processes that could cause uranium and thorium to be incorporated into minerals with a high melting point. Either it is the result of an unknown decay process, or it is the result of fractionation which is greatly increasing the concentration of radium or greatly decreasing the concentration of uranium. The above two-source mixing scenario is limited, because it can only produce isochrons having a fixed concentration of N p. I would not want to use a scale that might be right and might be wrong. In reality, I would expect that crystal growth would be blocked locally by various things, possibly particles in the way. We can use a formula for carbon 14 dating to find the answer. However, the composition of lead isotopes between magma chambers could still differ, and lead could be incorporated into lava as it traveled to the surface from surrounding materials. Earlier, I indicated how crystals can have defects or imperfections in which small amounts of magma can be trapped. Finally, if one only considers U-Pb and Th-Pb dates for which this test is done, and for which mixing cannot be detected. Uranium and thorium have high melting points and as magma cools, these elements crystallize out of solution and fall to the magma chamber's depths and remelt. The solubility of various substances in the magma also could be a function of temperature, and have an influence on the composition of the magma at the top and bottom of the magma chamber.
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