Potassium-Argon (K-Ar) Dating

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K-Ar dating - Wikipedia
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K-Ar dating . 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 ) .
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 .
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-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 .
What simplifies things is that potassium is a dating metal trash argon is an inert gas: Potassium is always tightly locked up in minerals whereas argon is not part of any minerals . Argon makes up 1 percent of the atmosphere . So assuming that no air gets into a mineral argon argon dating first forms, it has zero argon content .
The potassium-argon ( K-Ar ) geochronological method is one of the oldest absolute dating methods and is based upon the occurrence of a radioactive isotope of potassium ( 40 K ), which naturally decays to a stable daughter isotope of argon (radiogenic 40 Ar , also known as 40 Ar *) . For this reason, the K-Ar method is one of the few radiometric dating . . .
THE K-AR AND AR - AR DATING METHODS Introduction Both K-Ar and Ar - Ar dating techniques are based upon the decay of a naturally occurring isotope of potassium , 40K to an isotope of argon , 40Ar (Fig . 1) . The decay of 40K is by a branching process; 10 .48% of 40K decays to 40Ar by β+ decay (Beckinsale and
The K/Ar Dating technique 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 .
Argon - argon (or 40 Ar / 39 Ar) 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 .
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 .
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Potassium-Argon (K-Ar) Dating