When is potassium argon dating used
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The Atoms used for radiometric dating of NON LIVING things are: Potassium/Argon Uranium/Lead No element has the exact same election arrangement as another element.However ion can have the same election arrangement as another element.Although it is a simple calculation the big question is whether his assumptions about the rock were correct.If the rock actually contained some argon-40 when it solidified then the calculated age would be too old. What he does is check his calculated age with the ages produced by other dating methods.Nearly all argon atoms are the isotope with 22 neutrons.By far the most common isotope of potassium has only 20 neutrons.In some cases, elements were placed on the table based on their similarities in properties rather than their atomic masses and this is the case with argon and potassium.
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by Tas Walker 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.- Potassium-Argon method – Potassium-40 decays to argon and calcium.- Uranium-Lead method - Rubidium-Strontium method - Carbon-14 method – also known as carbon dating.The attraction of the method lies in the fact that one of the daughter elements is argon which is an inert gas.
This means that the geologist can plausibly assume that all argon gas escapes from the molten magma while it is still liquid.
On the other hand, if the rock was later disturbed by a geological upheaval and lost argon the age would be too young. In other words, he checks to see if his calculated result falls into the range where he expects it to fall, given the geological situation of where he found his rock.
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