Age dating argon
The quantity of potassium in a rock or mineral is variable proportional to the amount of silica present.
Therefore, mafic rocks and minerals often contain less potassium than an equal amount of silicic rock or mineral.
Ca F is also routinely irradiated and measured to determine the Ar technique relies on ratios instead of absolute quantities, we are able to extract and measure multiple aliquots of argon from a single sample.
The results from a laser probe can be plotted in several graphical ways, including a map of a grain showing lateral argon distribution.Argon loss occurs when radiogenic K by a fast neutron reaction) can be used as a proxy for potassium.Therefore, unlike the conventional K/Ar technique, absolute abundances need not be measured.However, because each of these parameters is difficult to determine independantly, a mineral standard, or monitor, of known age is irradiated with the samples of unknown age.The monitor flux can then be extrapolated to the samples, thereby determining their flux.