Potassium Argon Dating Accuracy

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potassium-argon dating | Definition, Limitations, & Facts . . .
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(A) The varying mineral composition of the myriads of types of rocks negates the accuracy of the standard potassium-argon dating method . (B) The potassium-argon method should not be used to calculate the ages of rocks . (C) As all new radiometric dating methods are calibrated using dates from existing methods, any based directly or indirectly on the potassium-argon method should not be used to calculate the ages of rocks .
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 .
When scientists at the University of Regina, Saskatchewan were asked what the results would be if these roots were dated by Potassium Argon method . Their response was that the results: "Would be meaningless; it would indicate an age of millions of years Because Heat was Involved in the petrification process ."
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 .
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 .
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 , 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 .
K-Ar dating relies on very long half-lives, and hence should not be used for dating new rocks . Wikipedia says "the technique is most applicable for dating minerals and rocks more than 100,000 years old . For shorter timescales, it is likely that not enough Argon 40 will have had time to accumulate in order to be accurately measurable ."
Potassium-Argon Dating Volcanic eruption of Mt Etna, Sicily in 122 BC the basalt dated 170,000-330,000 years old Volcanic eruption of Mt Etna, Sicily in AD 1972 the basalt dated 210,000-490,000 years old Volcanic eruption of Mt St . Helens, Washington in AD 1980 the rocks dated 300,000-400,000 years old
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Potassium Argon Dating Accuracy