Faure and T. And what's really interesting about that is that when you have these volcanic eruptions, and because this argon is seeping out, by the time this lava has hardened into volcanic rock-- and I'll do that volcanic rock in a different color. This is very interesting! This ratio is And there might have already been calcium here.
In these materials, the decay product 40 Ar is able to escape the liquid molten rock, but starts to accumulate when the rock solidifies recrystallizes.
Potassium-argon (K-Ar) dating
Then you have these fossils got deposited. But what's neat about argon is that while it's lava, while it's in this liquid state-- so let's imagine this lava right over here. However, I look at that same data and I come to very different conclusions. I'm just going to make up these numbers. It gives us negative 0. If you are having problems understanding the basics of radioisotopes techniques, such as. So how can we use this information-- in what we just figured out here, which is derived from the half-life-- to figure out how old this sample right over here?