Potassium-Argon Dating

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K-Ar dating - Wikipedia
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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 argonto radioactive potassiumin the rock . This datingmethod 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 .
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 .
Abstract . First results in an extensive programme in potassium-argon dating at Berkeley arc reported . Ultra-high-vacuum techniques have been incorporated in the argon extraction apparatus and in a new mass spectrometer especially designed for these researches . It is found that, because of these improvements, the radiogenic argon in small and . . .
General assumptions for the Potassium-Argon dating system . Certain assumptions must be satisfied before the age of a rock or mineral can be calculated with the Potassium-Argon dating technique . These are: The material in question is a closed system .
In order to determine how old the Earth is, these scientists use a technique called potassium-argon dating (K-AR) . A particular isotope of potassium , K-40, undergoes a decay process and eventually becomes an argon isotope, Ar-40 . It is reasonable to ask if the K-Ar test is accurate before we accept its results as accurate .
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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