Video: Yog vim li cas poov tshuaj argon dating pab tau?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov txheej txheem no yog feem ntau pab tau rau archaeologists thiab paleoanthropologists thaum lava ntws los yog volcanic tuffs tsim strata uas overlie strata bearing pov thawj ntawm tib neeg kev ua si. Cov hnub tau txais nrog cov qauv no ces qhia tau hais tias cov ntaub ntawv archaeological tsis tuaj yeem yau dua cov tuff lossis lava stratum.
Yog li ntawd, dab tsi yog potassium argon dating pab tau?
Potassium - argon sib tham , txheej txheem ntawm kev txiav txim siab lub sij hawm ntawm keeb kwm ntawm pob zeb los ntawm kev ntsuas qhov ratio ntawm radioactive argon rau radioactive poov tshuaj hauv pob zeb. Qhov no sib tham txoj kev yog raws li kev lwj ntawm radioactive poov tshuaj -40 rau radioactive argon -40 nyob rau hauv minerals thiab pob zeb; poov tshuaj -40 kuj lwj rau calcium-40.
Kuj Paub, yog poov tshuaj argon dating txheeb ze los yog kiag li? Ib qho ntawm feem ntau siv yog poov tshuaj – argon sib tham (K-Ar sib tham ). Potassium -40 yog radioactive isotope ntawm poov tshuaj uas decays rau hauv argon -40. Ib nrab-lub neej ntawm poov tshuaj -40 yog 1.3 billion xyoo, ntev dua li ntawm carbon-14, tso cai rau cov qauv qub ntau dua. hnub tim.
Ib tug kuj yuav nug, ua li cas poov tshuaj lwj rau hauv argon?
Thaum ib tug atom ntawm poov tshuaj 40 decays rau hauv argon 40, ua argon atom ua yog daig los ntawm crystalline qauv ntawm lava. Nws ua tau tsuas yog khiav thaum lub pob zeb yog nyob rau hauv nws lub xeev molten, thiab yog li tus nqi ntawm fossilized argon tam sim no nyob rau hauv lava tso cai rau cov kws tshawb fawb hnub tim lub hnub nyoog ntawm solidification.
Thaum twg yog potassium argon dating thawj zaug?
Xyoo 1935, Klemperer thiab, ntawm nws tus kheej, Newman thiab Walke (1935), tau hais, los ntawm cov laj thawj ntawm isotope systematics, kev ua haujlwm ntawm poov tshuaj mus rau ib-ces tsis paub - tsis tshua muaj isotope K40. Qhov no yog tus ua ntej zoo twv. Xyoo 1935, A. O. Nier tau tshawb pom qhov isotope thiab pom nws qhov kev nplua nuj yog 1.19 · 10-4 ntawm tag nrho K.
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