Mt st helens dating
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.
The first has to do with the reason Geocron's equipment was considered useful only for high concentrations of argon.
There would always be a certain amount of argon inside the mass spectrometer left over from previous experiments.
Let's begin with a basic understanding of the radiometric dating technique used, K-Ar, or potassium-argon.
This happens to K, 1.2 billion years later you'll have 500, and 1.2 billion years after that you'll have 250.You'll also have 83 argon atoms, and 667 calcium atoms.If I take a sample and measure an argon to potassium ratio of 0, I know that this sample is 2.4 billion years old.The equipment in use at the time at the lab employed by Dr.Austin, Geocron Laboratories, was of a type sensitive enough to only detect higher concentrations of argon gas.
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And there's pretty good reason for this: Geology dating is pretty complicated, and if you look at Dr.