Ar dating is a major method that researchers have used to understand the structural evolution of the Maria Fold and Thrust Belt.Argon-argon dating works because potassium-40 decays to argon-40 with a known decay constant. This led to the formerly-popular potassium-argon dating method.
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This process, known as "step heating", provides additional information on the age of the sample.
Reheating events and diffusion of argon from the boundaries of the grain can result in lower Ar date.
The thermal history of meteorites was interpreted in section 10.2.4 in terms of short-lived thermal events, including their initial cooling and any subsequent collisions, separated by long periods under cold conditions.
However, Turner (1969) recognised that in different circumstances, slow cooling from a single event could yield an age spectrum rather similar to that produced by episodic thermal events.