Problem with radioactive dating
Jim raised some interesting points but I don’t believe that he addressed the central points that Justin raised.Jim stated that “uranium is preferentially encased in these [zircon] crystals while lead is preferentially excluded” but did not fully explain the significance of this.Quick cooling or not having contact with the air can affect theoretical mechanisms for "resetting" the clock.
It was explained by the processes of heating and cooling that the soil had been through. Dalrymple, “40Ar/36Ar Analyses of Historic Lava Flows,” Earth and Planetary Science Letters,6 (1969): pp. Some rocks have been measured with negative radiometric ages, in some cases in terms of millions of years.Kevin Rogers submitted a comment to that article (reproduced below, edited to focus on substantive issues), to which Dr Jim Mason replies.Radioactive Dating Methods I am Kevin Rogers and am the director of Reasonable Faith Adelaide.Some rocks dated older than the 4.5 billion year evolutionary age for Earth. Isochron dating can also produce negative ages, by producing a negative slope.K-Ar and Ar-Ar can result in negative ages when atmospheric argon is considered.
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Evidence for Isotopic Fractionation does show up in isotopic data so it is a factor that needs to be considered.