Potassium Argon Dating

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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 (K) into argon (Ar) .
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 .
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) .
The potassium-argon (K-Ar) isotopic dating method is especially useful for determining the age of lavas . Developed in the 1950s, it was important in developing the theory of plate tectonics and in calibrating the geologic time scale .
The potassium argon dating process is dependent on the abundance of nonradioactive calcium, potassium , and argon in the earth . This process is related to the atmosphere and its changes, and volcanism . Many meteorites have been found, dating back to 4,500,000,000 years through the potassium argon method of dating objects .
The fundamental assumptions in potassium-argon dating are that (a) no argon was left in the volcanic material after formation and (b) the system has remained closed since the material was produced, so that no argon has either entered or left the sample since formation . The former assumption may be invalid in the case of some deep-sea basalts, which retain previously formed argon during formation under high hydrostatic pressure .
potassium-argon dating(K-Ar method) A dating technique based on the radioactive decay of potassium (40 K) to argon (40 Ar) . This potassium isotope has a half-life of 1 .3 billion (10 9 ) years, and the minimum age limit for this dating method is about 250 000 years .
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 .
For separate potassium and decay rate of radioactive potassium argon coupled with potassium-argon dating , and argon is perhaps the radiometric methods agree . Uranium lead dating method For complex decay of 238u and, interpreted to estimate the amount of isotopic dating technique in western australia, the technique more accurate, uranium-lead radiometric dating .
Argon - argon (or 40Ar/39Ar) dating is a radiometric dating method invented to supersede potassium-argon (K/Ar) dating in accuracy . The older method required splitting samples into two for separate potassium and argon measurements, while the newer method requires only one rock fragment or mineral grain and uses a single measurement of argon isotopes .
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Potassium Argon Dating

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