Isochron dating explained

Chemically, zircon usually contains high amounts of U and low amounts of Pb, so that large amounts of radiogenic Pb are produced. Usually it is easy to determine whether or not this requirement is met. Other Uses of Isotopes Radioactivity is an important heat source in the Earth. The old age provided by isochron dating methods obviously conflicts with the young age of only 6, years held by these creationists. Prior to the best and most accepted age of the Earth was that proposed by Lord Kelvin based on the amount of time necessary for the Earth to cool to its present temperature from a completely liquid state. This problem is undetectable even within the isochron's "self-checking" methods and can result in error when computing a given age for a rock.

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One might conclude that whatever process created the elements in the rock, created different amounts of mother and daughter elements.

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Isochron Dating

It sounds as if you are suggesting that geologists might keep trying isochron plots on a single item until they get one where the data points line up, which probably isn't representative of its "real" age, and only that one gets published. It has been established through extensive experimentation that radioactive decay occurs at a constant rate. Unsourced material may be challenged and removed. If we divide equation 4 through by the amount of 86 Sr, then we get: If all data points lie on a straight line, this line is called an isochron. The decay schemes are as follows. However, the methods must be used with care -- and one should be cautious about investing much confidence in the resulting age

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