Potassium argon dating mt st helens
The conventional K-Ar dating method was applied to the 1986 dacite flow from the new lava dome at Mount St. The whole-rock age was 0.35 /- 0.05 million years (Mya). Excess argon within mineral concentrates from the New Dacite Lava Dome at Mount St. Creation Ex Nihilo Technical Journal 10(3): 335-343. module=research&action=index&page=researchp_sa_r01 Henke, Kevin R. Ages for component minerals varied from 0.34 /- 0.06 Mya to 2.8 /- 0.6 Mya. 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 experimental method applied to events in the past.
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.
This excess argon greatly alters the calculated age and puts into question the validity of the method.