It is not possible to choose between them based on the measurements themselves. Two kinds of magma and implications for radiometric dating It turns out that magma has two sources, ocean plates and material from the continents crustal rock. An example is cited in one of the online resources cited at the end of Jim's article: Its exact location in the stratigraphic column at any locality has nothing to do with radiometric dating — it is located by careful study of the fossils and the rocks that contain them, and nothing more. The element that is formed in this case, lead is called the daughter element. News Alerts Blog Contact Sign up.
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It's not only a matter of incorporation in minerals either, as one sometimes does whole rock isochrons and I suppose parent-daughter ratios of whole rock, which would reflect the composition of the magma and not the incorporation into minerals.
Radiometric dating problems
Some of my background is in software testing. Without these observations you cannot be sure that the time is valid. Further Reading The way it really is: The jury looks at the evidence and assesses which of the two interpretations of the evidence the one given by the prosecution or the one given by the defence provides the most comprehensive and coherent explanation of the evidence and, therefore which underlying presupposition is correct, i. I saw a reference that uranium reacts strongly, and is never found pure in nature.