How Does Potassium 40 Dating Work

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Potassium -argon dating , method of determining the time of origin of rocks by measuring the ratio of radioactive argon to radioactive potassium in the rock . This dating method is based upon the decay of radioactive potassium-40 to radioactive argon- 40 in minerals and rocks; potassium-40 also decays to calcium- 40 . Thus, the ratio of argon- 40 and potassium-40 and radiogenic calcium- 40 to potassium-40 in a mineral or rock is a measure of the age of the sample .
Potassium -Argon Dating Potassium -Argon dating is the only viable technique for dating very old archaeological materials . Geologists have used this method to date rocks as much as 4 billion years old . It is based on the fact that some of the radioactive isotope of Potassium , Potassium-40 (K-40) ,decays to the gas Argon as Argon- 40 (Ar- 40 ) .
Potassium-40 decays with a half-life of 1250 million years, meaning that half of the 40 K atoms are gone after that span of time . Its decay yields argon- 40 and calcium- 40 in a ratio of 11 to 89 . The K-Ar method works by counting these radiogenic 40 Ar atoms trapped inside minerals .
The potassium -argon method is frequently used to date lava flows whose age is between a million and a billion years . When an atom of potassium 40 decays into argon 40 , the argon atom produced is trapped by the crystalline structure of the lava . It can only escape when the rock is in its molten state, and so the amount of fossilized argon . . .
potassium -argon dating A dating technique for certain rocks that depends on the decay of the radioisotope potassium-40 to argon- 40 , a process with a half-life of about 1 .27 × 10 10 years . It assumes that all the argon- 40 formed in the potassium -bearing mineral accumulates within it and that all the argon present is formed by the decay of potassium-40 .
How potassium -argon dating works . One of the most widely used dating methods is the potassium -argon method, which has been applied to 'dating' rocks for decades, especially igneous rocks that have solidified from molten magma . The attraction of the method lies in the fact that one of the daughter elements is argon which is an inert gas .
Potassium-40 is especially important in potassium -argon (K-Ar) dating . Argon is a gas that does not ordinarily combine with other elements . So, when a mineral forms - whether from molten rock , or from substances dissolved in water - it will be initially argon-free, even if there is some argon in the liquid .
Carbon-14, the radioactive isotope of carbon used in carbon dating has a half-life of 5730 years, so it decays too fast . It can only be used to date fossils younger than about 75,000 years . Potassium-40 on the other hand has a half like of 1 .25 billion years and is common in rocks and minerals . This makes it ideal for dating much older rocks and fossils .
Potassium -argon dating , abbreviated K-Ar dating , is a radiometric dating method used in geochronology and archaeology . It is based on measurement of the product of the radioactive decay of an isotope of potassium into argon . Potassium is a common element found in many materials, such as feldspars, micas, clay minerals, tephra, and evaporites . In these materials, the decay product 40 Ar is able to escape the liquid rock, but starts to accumulate when the rock solidifies . The amount of . . .
Potassium -argon (K-Ar) dating | Cosmology & Astronomy | Khan Academy - YouTube .
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How Does Potassium 40 Dating Work

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