Potassium - Argon and Argon - Argon dating are based on the current understanding that radioactive Potassium-40 decays to the stable form, Argon-40 with a half-life of approximately 1.25 billion years. The conclusions of Renne and his team read as follows: Ar can be identified in volcanic sanidine, and while perhaps negligible in pre-Holocene rocks, it has important consequences for sample at the limit of the methods applicability.If one starts with an originally pure sample of parent element, then the proportion of parent to daughter tells us the number of half-lives, which has been used to find the supposed age of igneous rocks. Further improvement in precision of Ar dating are most commonly used to "prove" the ancient age of many life forms, I will discuss these dating methods specifically in more detail and show that they, along with the other common methods of isotope dating, are to be highly questioned.Ar in the rock should be the result of decay from potassium.
Also, even if the argon-argon dating method does eliminate the "contamination" problem, it does not solve the problem of original argon. Renne tested Ar-Ar dating by checking it against the 79 A. This is approximately 2,500 times as much Ar as is found in natural muscovite.
Did the clock get reset to zero when the volcano erupted? Thus under certain conditions Ar can be incorporated into minerals which are supposed to exclude Ar when they crystallize.
Additionally, variations in uranium content within a sample can lead to large variations in fission track counts in different sections of the same sample.
Because of such potential errors, most forms of fission track dating use a form of calibration or "comparison of spontaneous and induced fission track density against a standard of known age.
was published, the earth was "scientifically" determined to be 100 million years old. In 1947, science firmly established that the earth was 3.4 billion years old.
Finally in 1976, it was discovered that the earth is "really" 4.6 billion years old What happened?
That is why it does not matter how long the magma was in the volcano before it erupted.
They believe that when the volcano erupts, all the Scientists are well aware of this problem and use various calibration methods to "correct" for this problem. However, while it is often easy to determine the age of the primary standard by the K/Ar method, it is difficult for different dating laboratories to agree on the final age.
For example, Naeser and Fleischer (Harvard University) showed that, depending upon the calibration method chosen, the calculated age of a given rock (from Cerro de Mercado, Mexico in this case) could be different from each other by a factor of "sixty or more" - - "which give geologically unreasonable ages.