The geochronologist takes this factor into account when assigning experimental errors to the calculated ages. The K-Ar method has two principal requirements. First, there must be no argon other than that of atmospheric composition trapped vacuum advance hook up the rock or mineral when it forms.
Second, the rock or mineral must not lose or gain either potassium or argon from the time of its formation to the time of analysis. By many experiments over the past three decades, geologists have learned which types of rocks and minerals meet these requirements and which do not. The K-Ar clock works primarily on igneous rocks, i. It does not work well on sedimentary rocks because these rocks are composed of debris from older rocks.
It does not work well on most metamorphic rocks because this type of rock usually has a complex history, often involving one or more heatings after initial formation. The method does work on certain minerals that retain argon well, such as muscovite, biotite, and volcanic feldspar, but not on other minerals, such as feldspar from granite rocks, because they leak their argon even at low temperatures.
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