Potassium argon dating mt st helens brad bettina dating
In fact, due to the difficulties in applying the experimental method to events in the past, all chronometers based on natural or artificial nuclear disintegration need a calibration.
This calibration supposes a great number of basic assumptions concerning initial conditions.
To give an example of the complexity of this problem, this paper presents a study of the most popular dating method, potassium/argon.
The discussion of some phenomena taking place during rock crystallization reveals huge discrepancies between the model theory and the reality.
We are obliged to use deductions and assumptions based exclusively on the effects of these past events presently observable.
The knowledge of a past event is indirect and a complex combination of assumptions and contemporary experiments is required to test the credibility of supposed initial conditions.
To be able to give a known relation between the quantities P and D measured presently in a rock and the time elapsed since the formation of the rock, we need to make the following basic assumptions: If we compare the radioactive rock with an hourglass, the conditions are summarized in Figure 3a and 3b, to illustrate the initial conditions chosen and the “closed system” concept.
All radiochronometers are based on the radioactive decay of unstable atoms (“parent” atoms, P).What we can observe today is the result of a chain of causes spread over a period of time.