Accuracy of radiometric dating methods

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Even this is problematical, unless the magma is very hot, and no external material enters. Our understanding of the shape and pattern of the history of life depends on the accuracy of fossils and dating methods. Such failures may be due to laboratory errors mistakes happenunrecognized geologic factors nature sometimes fools usor misapplication of the techniques no one is perfect. People should read John Woodmorappe's articles on radiometric dating to see some of the anomalies. For example, it has been known since the s that the famous Cretaceous-Tertiary boundary, the line marking the end of the dinosaurs, was 65 million years old. So this assumes at the start that chemical fractionation is operating. The electric charge distribution would create an attraction between the uranium compound and a crystallizing mineral, enabling uranium to be incorporated.

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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. Canon of Kings Lists of kings Limmu. Radiometric Time Scale". By analogy with the behaviour of Ra, Th and U it can be suggested that Pb, owing to its large mobility, was also fed to the magma by fluids. As far as I know, it's anyone's guess, but I'd appreciate more information on this.

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