Potassium-Argon and Argon-Argon Dating for Fossils | Archaeological Dating Methods
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- เผยแพร่เมื่อ 7 ก.ค. 2024
- Potassium-Argon dating is similar to Carbon 14 dating because it uses radioactive decay, measuring the rate of change from an unstable isotope, to a stable one. This method is a little different from the other ones we’ve talked about because with Potassium-Argon dating, we aren’t directly dating artefacts. Nope, we’re dating rocks!
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Potassium has three naturally occurring isotopes: Potassium 39 (39K) which makes up 93.258% of all potassium in the world, potassium 40 (40K) which makes up 0.0117%, and potassium 41 (41K) which makes up the remaining 6.7302%. Potassium 40 is an unstable isotope. It has an extra neutron and it doesn’t like this squatter hanging out in its nucleus. So just like carbon 14, potassium 40 wants to be stable again. And this all happens through radioactive decay.
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#archaeology #PotassiumArgonDating #Archaeologyvideo
My archaeology professor actually showed this video in one of his lectures! Just want to say your a true inspiration to me as a female wanting to become an archaeologist. It definitely is such a fascinating field that really needs more recognition!
😭😭 omg thank you that is so sweet to say!!!
That is the best response to sexist comments I have seen to date. Bonus points for using the burn to aid the illustration of your lesson as well. Love it!
You gotta take the hate and turn it into a positive learning moment 😉
Every time I'm confused about something in my textbook I come to you and am not disappointed. Please keep doing what you are doing!
Awesome post, wonderfully explained. Keep up the great work and thank you.
Thank you for this digestible explanation!! *many claps* This helped clear up some confusion I had about these methods! :)
Awesome video!! Thank you so much, Raven!!
Glad you liked it!!
Wow, super interesting and informative!
Great video and series! We love the archaeology site PB sandwich analogy! Our favorite activity with kids is the M&M chocolate chip cookie excavation. The chocolate chips and M&M's represent different artifacts and the cookie represents the dirt of the site. The goal is to excavate without destroying the artifacts and to map where each artifact found on the cookie grid. When they are finished we have them place the artifacts in categories based on colors and try to explain what was happening at the site. We say it's an activity for kids, but adults love it too!
im so dumb i thought this was about some archeologists dating lol
Haha I do have an archaeology pick up line video if you want to see how bad we are at dating though
I'm glad potassium got help. It's always nice to see elements of psychology. In, I mean. In psychology.
Heyyy, chemist here and today you answered one of my lingering questions about K dating: how is t0 established. You´ve got my subscribe!
Reading Richard Dawkins 'The Greatest Show On Earth' Evidence for Evolution and hooked up to your video. You explained the archaeological dating method so elementary that even I can understand it. Well done Raven. It's a fascinating branch of knowledge. Love your work. Keep up the great efforts.
This book is really fascinating and after reading I also came up with this video while seeking more info.
New video, yaaaayyy
The fact that Raven turned some sexist sandwich comments into a comedic joke makes this “dating” video, and it’s wonderful host, 3x hotter if I may be so honest.
🥪❤️ Awesome Vid.
How accurate is the argon argon method for recent volcanic eruptions? There was a paper using this method for the eruption of Vesuvius, Italy in AD 79. It was off my a few years. I didn't think it was possible.
Just wow mam
Haha. That pew pew moment broke me. 😂
Thank you for an amazing explanation. I've got just one question.. If K40 undergoes decay to Ar40, then how can Potassium40/potassium39 ratio be constant? (8:52)
With the pandemic lockdown measures, all of my prospects for dating...argon
also, was there something wrong with your camera lens' focus system?
Yes it betrayed me partway through!! I have a new camera now thankfully
I need the recipe for the sandwhich. Looks delicious. You can tell i dont spend much time on CookingTube.
I'm so glad you mentioned Star Trek and not Star Wars! 😭😍😍👍👍 Definately the more scientific fandom.
You went over this in the video, but for this to be viable we would *need* two eruptions? One on top of the site, but one underneath it too so we know an effective range (in my head I’m thinking “what’s stopping an eruption from happening a while later, but coincidentally in the same area as the site, and then it messes up all your estimates”)? Or do you only need a single sample, and you can just know it will effectively date the site
For sandwich dating yes two eruptions would be needed! But if more eruptions happen, it will leave a distinctive layer that we can identify and date separately. That's the glory of stratigraphy :)
everything's delightful until you said you're gonna have it yourself 🥺
What about dating rocks formed at Mount St Helen?
Make me a sandwhich? No. Date me a sandwich? YES.
Raven...What DOES your profile look like on the app for "dating" fossils? Two other questions: Why have people been fundamentally not so bright as to LIVE near volcanoes for ANY amount of time? And...are you saying that Star Trek science is not real????? How about Star Wars? (Whoops! That was 3 more questions!) Disneyland is real and Disneyland has Star Wars stuff.
Haha my profile is much less exciting than others. Full of old things that no one understands ;).
1. volcanic areas are actually very fertile places and so when they're not spewing, you can grow quite a bit on there!
2. There's a fun Star Trek and archaeology video over on ArchaeoDuck's chanel- go check it out! As to the rest of the science.... I've not watched much of Star Trek so I cannot comment!
3. Star Wars is real.... in all our hearts
@@DigItWithRaven I see...full of old things that no one understands...Oh! And Happy Birthday by the way! Oh again...the "fossil dating app" remark and my making mention of your comment about "full of old things that no one understands" should in NO way be misconstrued as a joke about your age.
Why does this method only date Igneous rocks? Is it because Sedimentary & Metamorphic rocks do 🚫 NOT contain Argon? Is there any Dating Method suitable for dating Sedimentary & Metamorphic rocks?
I don't want to expose you, but how do you know how many atoms of potassium per volume were there in the first place?
Did you know that oxygen went for a second date with potassium?
"How did it go?"
"It went OK2!" ='D
:|
Haha chemistry jokes! Love it
i didn't even know "make me a sandwich" was a thin, in New Zealand we not so angry, but the sandwich example was perfect and ima gona make it for my me. UcooL
Humans walking the earth over a million years ago is awesome.
But how did you determine the half-life of potassium 40? Has this been determined experimentally? What method did you use to determine the half-life? How is it possible to determine that in this case where you say the half-life is over a billion years? I think it is impossible to create laboratory conditions that could determine that time.
You said Potassium 40 has a half life of 1.25 billion years but how is that possibly known??
I am an auditory learner, so your podcasts are so much easier to remember than passages from Renfrew&Bahn or Barker. Plus the video stimuli, of course.
Volcanic SNOT!! SNNRRRRX
Amazingly well done. I’ve got a couple questions I always wonder about this topic.
How do we know the half-life of 1.5 billion years? Don’t all unstable isotopes have variable, exponential decay rates? Maybe you’ve got another video on this, if so, sorry!
The exponential curve is the remaining undecayed isotope as it halves in mass at each half-life period
Edit: this isn't the best explanation, but... the half-life is an average over a very large number of nuclei decaying; each has a 50/50 chance of decaying in each half-life, but like tossing _a lot_ of coins, roughly half will come up heads/decay each toss/half-life.
I'm a bit late, but.. is there any more sandwich?
MAKE ME A SANDWICH!
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Mmm yes delicious sandwich thank you
Dating a guy who says to make him a sandwich: NO
Dating a guy who makes Stratigraphic sandwiches: YES
You should not be so sure about what happened in the past
Ahhhh the good old days when I used to argue with Creationists about dating methods.
Good information but please lose the cute style and attempts at humor. Your audience is smarter than you think.