Potassium-Argon Radiometric Dating Methods

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Potassium-Argon Dating - Stuart Tyson Smith
Potassium-Argon Dating - an overview | ScienceDirect Topics
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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) .
This chapter has summarized the application of radiometric methods (cosmogenic nuclide dating , radiocarbon dating , optically stimulated luminescence dating , argon - argon and potassium-argon dating ) to glacial environments . These numerical radiometric techniques can be used in conjunction with archival methods , relative dating methods such as morphostratigraphy and Schmidt hammer dating , and incremental methodologies such as lichenometry, varve counting and dendroglaciology to date glacial . . .
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 (K-Ar) dating is the most widely applied technique of radiometric dating . Potassium is a component in many common minerals and can be used to determine the ages of igneous and metamorphic rocks . The Potassium-Argon dating method is the measurement of the accumulation of Argon in a mineral .
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 is a common element found in many materials, such as feldspars, micas, clay minerals, tephra, and evaporites .
Potassium-Argon radiometric dating is used to establish dates of lava flows . When observed lava flows were later dated massive errors were found in this dating method . As an example: a flow only 10 years old was dated to be as old as 2 .8 million years old! Due to these repeated errors evolutionists now state the dating method is not good on . . .
Radiometric dating calculates an age in years for geologic materials by measuring the presence of a short-life radioactive element, e .g ., carbon-14, or a long-life radioactive element plus its decay product, e .g ., potassium -14/ argon -40 . The term applies to all methods of age determination based on nuclear decay of naturally occurring radioactive isotopes . Bates and Jackson (1984)
POTASSIUM ARGON METHOD • The potassium-argon (K-Ar) isotopic dating method is especially useful for determining the age of lavas . • Potassium has one radioactive isotope (40K) . • Potassium -40 decays with a half-life of 1250 million years . • What simplifies things is that potassium is a reactive metal and argon is an inert gas .
Other dating techniques, like K-Ar ( potassium-argon and its more recent variant 40 Ar/ 39 Ar), Rb-Sr (rubidium-strontium), Sm-Nd (samarium-neodynium), Lu-Hf (lutetium-hafnium), and U-Pb (uranium-lead and its variant Pb-Pb), have all stood the test of time . These methods provide valuable and valid age data in most instances, although there is a . . .
Radiometric dating , radioactive dating or radioisotope dating is a technique which is used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed . The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay . The use of radiometric dating was first published in 1907 by Bertram Boltwood and is now t
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Potassium-Argon Radiometric Dating Methods