Unreliability of Radiometric Dating and Old Age of the Earth Unreliability of Radiometric Dating and Old Age of the Earth

Sources of uncertainty in radiometric dating. More bad news for radiometric dating

If the reverse happens before mixing, the age of the isochron will be decreased.


For the Po half-life of 3 minutes only a matter of minutes could elapse between the formation of the Po and subsequent crystallization of the mica; otherwise the Po would have decayed, and no ring would be visible.

Half way between there is a mixture of half A and half B, for example. Movement of data points as decay occurs. But argon does not need to move through all rock in order to influence radiometric dates, it only has to reach ancient lava flows.

K-Ar dates of 7 to 15 billion years have been recorded.

Circular Reasoning or Reliable Tools?

It is also being claimed that the standard deviations are not too large. Pb radioisotope dating is now the absolute dating method of first choice among geochronologists, especially using the mineral zircon. This is how geologists explain away the old isochron at the top of the Grand Canyon.

How long has cry and cheyenne been dating

It does not answer the overall question. Bowen discovered that as magma cools in the laboratory, certain minerals crystallize first. We can also detect the characteristic radiation signatures of radioactive decay in those nuclides.

Another factor to consider. Let me make some general comments about isochrons. Even some figures from Faure, Principles of Isotope Geology, are based on another constant that is 2 or 3 percent too low, according to Dalrymple, and so there may be many ages in the literature that need revision by small amounts.


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This results in an identical Y-value for the data points representing each mineral matching the Y-value of the source material. Let's apply all known dating methods to Gi that are thought to apply to this kind of rock, and obtain ages from each one.

So this assumes at the start that chemical fractionation is operating. It happens in all sciences. Ordinarily, these reactions are not complete so that various amounts of each of these minerals may exist at any given time. For further information on fitting of lines to data also known as regression analysissee: Also, the half-life depends exponentially on the shape of the potential well, so that even slight changes are effective in accelerating alpha-decay.

In addition, with each successive eruption, some gas would escape, reducing the pressure of the gas and reducing the apparent K-Ar radiometric age. Perfect crystals are very rare.