Argon radioactive dating
If this condition is true, then a “model age” allows the calculation of a time function of argon40 and potassium40 present in the rock, and of the half-life of potassium40. The detection limit, function of the K40 content in the rock, ranges between 0.01 and 0.2 Ma (Ma = mega anni = million years).But, in addition, it is necessary to consider a “closed” system without any loss and/or gain of Ca40, K40 or Ar40.Later events are able to modify and restructure the consequences of the prior event, figure 2, giving erroneous conclusions.What we can observe today is the result of a chain of causes spread over a period of time.
We are obliged to use deductions and assumptions based exclusively on the effects of these past events presently observable.
This calibration supposes a great number of basic assumptions concerning initial conditions.
The choice of these initial conditions affects the results.
These investigations suppose complete coordination between different disciplines and laboratories.
The experimental method applied to events in the past.