Excellent equipment sets you up for success in precision long-range shooting almost more so than any other shooting sport, given the extremely high accuracy requirements of the game. Potassium-argon K-Ar dating. There's another layer of volcanic rock right over there.
Potassium-Argon Dating Methods
And you know that this layer right over here solidified. Given careful work in the field and in the lab, compulsive these assumptions can be met. And it erupts at some time in the past.
From Wikipedia, the free encyclopedia. And so what's neat is, this volcanic event, the fact that this rock has become liquid, it kind of resets the amount of argon there. These effects must be corrected, and the process is intricate enough to require computers. The potassium and argon must both stay put in the mineral over geologic time. There are competitions that allow or are even just for, smaller caliber rifles like the venerable.
Argon argon dating
And let's say you see some fossils in here. So when you think about it decaying into argon, what you see is that it lost a proton, but it has the same mass number. This information is typically expressed in terms of the decay constants.
- It'll just bubble out essentially, because it's not bonded to anything, and it'll sort of just seep out while we are in a liquid state.
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- So you can look at the ratio.
- Now, some of the other isotopes of potassium.
- As the tube that actually launches the bullets, the barrel has a vital role in making sure that rounds fly straight and true.
This requires an extra step. So argon is right over here. And as we'll see, app when you can date old volcanic rock it allows you to date other types of rock or other types of fossils that might be sandwiched in between old volcanic rock. Who can afford these gold plated rifles? So what's interesting about this whole situation is you can imagine what happens during a volcanic eruption.
Potassium occurs naturally as three isotopes. Rock samples are recorded, marked, sealed and kept free of contamination and excessive heat on the way to the lab. The learning curve has been long and is far from over today. And this is actually the most common isotope of potassium.
But in this case the nature of zircon was an advantage. So the good thing about that, as opposed to something like carbon, it can be used to date really, really, really old things. So the only way that this would have been able to get trapped is, while it was liquid it would seep out, but once it's solid it can get trapped inside the rock.
Potassium-argon (K-Ar) dating
But it hopefully makes the point that Ar-Ar dating can take data from small samples based on mass spectrometry. It allows us to date things that are very, very, very old and go way further back in time than just carbon dating. One archeological application has been in bracketing the age of archeological deposits at Olduvai Gorge by dating lava flows above and below the deposits.
Use one of these as your long range rifle? Many people who are serious about the precision long-range game will end up building their own rifles or buying custom rifles made to their specifications. The most important part of your precision long range gun is the barrel. The selected size fraction is cleaned in ultrasound and acid baths, then gently oven-dried.
You can find out more about Annette and what she's up to at Blasting Beauty. And I have a snapshot of it, about of not the entire table but part of it here. It's a very scarce isotope. So then you're only going to be left with potassium here. It looks like it's been pretty untouched when you look at these soil samples right over here.
And there might have already been calcium here. And volcanic eruptions aren't happening every day, but if you start looking over millions and millions of years, on that time scale, they're actually happening reasonably frequent. Now, we also know that not all of the atoms of a given element have the same number of neutrons. It's a bunch of stuff right over here.
Potassium-argon (K-Ar) dating (video)
- Chicxulub was not so obvious as a candidate because much of the evidence for it was under the sea.
- This is the hardest one to satisfy.
- The rock sample to be dated must be chosen very carefully.
It's not going to bond anything. So if you fast forward to some future date, and you see that there is some argon there, in that sample, you know this is a volcanic rock. With the right ammunition, that means these rifles shoot half-inch groups at yards right out of the box.
Clocks in the Rocks
Also, the cheaper K-Ar method can be used for screening or reconnaissance purposes, saving Ar-Ar for the most demanding or interesting problems. Before the mineral sample is put in the vacuum oven, it is irradiated along with samples of standard materials by a neutron source. So let's say this is the ground right over here. And it's very, very, very, very scarce.
And when we talk about a given element, but we have different numbers of neutrons we call them isotopes of that element. And let me do it in a color that I haven't used yet. You know that it was due to some previous volcanic event.
The details are best pursued in a dedicated text like McDougall and Harrison. You do not pay anything extra and your purchase helps support my work in bringing you more awesome gun and gear articles. Now imagine shooting further, at smaller targets, who pays online dating perhaps with some time or ammunition limits. Decades of basic research has given us this data. No rifle you can order from any other manufacturer will come with dry rub for your next barbeque.
So it erupts, and you have all of this lava flowing. Thus, the amount of calcium originally present is not known and can vary enough to confound measurements of the small increases produced by radioactive decay. And the reason this is really useful is, you can look at those ratios. And we could write it like this.
It all starts at the breech end, where the round enters the barrel. So they're all going to have a certain amount of potassium in it. Looking to get into the action yourself?