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But we can only observe the contemporary consequence of the past event under study.
Later events are able to modify and restructure the consequences of the prior event, figure 2, giving erroneous conclusions.
Anomalous « K/Ar model ages » are frequently reported in the literature.
This work explains these erroneous ages by « excess » argon (radiogenic and/or primeval) in volcanic rocks under study.
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.
Ar ages (whole-rock, biotite and plagioclase separates) exist for basalts and gabbros from Noril'sk, Putorana, Maymecha-Kotuy, West Siberian Basin, Taimyr, Kuznetsk Basin and the polar Urals.
Normalised to a common standard, they all lie within error of each other, and indicate a magmatic crystallization ages of between 248-250 Ma (Figure 1).
The experimental method applied to events in the past.
The experimental method can solve scientific questions and problems by using instruments, measurement procedures, and data treatment.