Non radiometric dating flaws
So all of the scenarios given apply to this large class of dates. 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. As the plume rises it melts and incorporates other crustal rocks. For this reason, this arrangement of minerals became known as Bowen's reaction series. It turns out that uranium in magma is typically found in the form of uranium dioxide, with a melting point of degrees centrigrade.
Progressive geochemical differentiation of the upper mantle of the Earth has resulted in the concentration of U and Th into the rocks of the continental crust compared to those of the upper mantle. But many minerals take in a lot of uranium. Most of the uranium deposits in Wyoming are formed from uraniferous groundwaters derived from Precambrian granitic terranes.
Jon Covey cited some references about this, and it will take a lot of work to understand what is going on from a creationist viewpoint. The same kind of fractional crystallization would be true of non-granitic melts. The really funny thing to me is that it is very possible that we are trying to explain a phantom of our imagination. So all of the scenarios given before can also yield spurious isochrons.
For example, it's not clear to me that we need to worry about isochrons or whether U and U dates etc. There are so many complicated phenomena to consider like this that it calls the whole radiometric dating scheme into question. Then the system has to remain closed for a long time.
First let me note that there is a lot more going on than just mixing. The correlation was not very good. Fractionation followed by mixing can create isochrons giving too old ages, without any fractionation of daughter isotopes taking place.
This will tend to lower the ages. This chemical fractionation will most likely arise by some minerals incorporating more or less uranium or thorium relative to lead. We need to consider the implications of this for radiometric dating. It is also a convincing proof that some kind of drastic fractionation is taking place, or else an unknown process is responsible. These minerals would then fall to the bottom of the magma chamber and thus uranium at the top would be depleted.
More Bad News for Radiometric Dating
Uraninite is also known as pitchblende. This can also result in isochrons being inherited in the same way. The relative concentrations of lead isotopes are measured in the vicinity of a rock.
Thus we need to have an uneven distribution of D relative to N at the start. Mechanism of uranium crystallization and falling through the magma We now consider in more detail the process of fractionation that can cause uranium to be depleted at the top of magma chambers. As lava rises through the crust, it will heat up surrounding rock.
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