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10 Feb

Radioactive Dating Methods I am Kevin Rogers and am the director of Reasonable Faith Adelaide.Last year we held a number of meetings on the young/old earth issue and gave YECs numerous opportunities to speak. At their request, physicist Dr Jim Mason, of CMI Canada, reviewed the material from the meeting and his response was published on 2 April 2015 (see Response to Geochronology: Understanding the Uncertainties, a presentation by Dr Justin Payne). We previously reported an event organized by the Adelaide, Australia, Chapter of Reasonable Faith where Dr Justin Payne, a lecturer within the School of Earth and Environmental Sciences at the University of Adelaide, sought to ‘disprove’ objections to long-age radiometric dating.

I submit that there is no such independently and unarguably known age—unless one is prepared to accept the age that is derived from the Bible, that was provided to us by God, an eyewitness, and some reliable scribes.

The technique does have the added advantage that if the ‘ages’ from both the 238U and 235U chains agree with each other, it adds support to the hypothesis that both chains have experienced the same effects during the formation and lifetime of the crystal. ’ The claim is that if a rock undergoes a metamorphic process then some of the U or Pb from the zircon would be lost, which means the ages would no longer be concordant.

A colleague, Dr Tas Walker, advises that, “the Concordia technique arose from the fact that the two U decay series should give the same ‘age’ but almost always they didn’t—i.e. So, where the top part of the line through the zircons intersects the Concordia curve is said to be the ‘age’ of the zircon.

I did not discuss this technique because it seems a pretty straightforward combination of various parent-daughter relationships.

The Wikipedia article that you reference would seem to confirm this.