Rubidium-Strontium and Uranium-Lead also has problems of the same kind.
Potassium, Rubidium and Uranium salts are highly soluble.
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If this were the case, the first assumption would be deemed unreasonable.
This would completely upset our current standardized view of earth's history.
Radiometric Dating - A Brief Explanation Radiometric dating is the primary dating scheme employed by scientists to determine the age of the earth.
Radiometric dating techniques take advantage of the natural decay of radioisotopes.
Radioisotopes are unstable isotopes: they spontaneously decay (emitting radiation in the process -- thus making them radioactive).That is where the sample of interest is tested along with several others of the same rock type, but from different areas. Walt Brown’s book on-line at The Center for Scientific Creation.On page 64 of his book he describes the double blind test needed to establish credibility for radiometric dating.Therefore, since sedimentary rock is the only kind of rock that bears fossils, a relative date is estimated by the position of a sedimentary rock in relation to an igneous outflow.There is a discussion of a few examples of radiometric methods with sedimentary rocks in Creationists believe that the assumptions of radiometric dating are invalid and cannot be proven.
John Woodmorappe’s books are advertised elsewhere on my web site.