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What are the limits of potassium argon dating

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Neither the model or her clothing represent India. 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 to radioactive argon in minerals and rocks; potassium also decays to calcium Thus, the ratio of argon and potassium and radiogenic calcium to potassium in a mineral or rock is a measure of the age of the sample. Urolagnia The calcium-potassium age method is seldom used, however, because of the great abundance of nonradiogenic calcium in minerals or rocks, which masks the presence of radiogenic calcium. On the other hand, the abundance of argon in the Earth is relatively small because of its escape to the atmosphere during processes associated with volcanism. The potassium-argon dating method has been used to measure a wide variety of ages.However, the dating of Quaternary, low potassium rocks continues to test the limits of the method because of small quantities of radiogenic argon and large atmospheric argon contamination. This document presents a short tutorial on the development and application of 40 Ar/ 39 Ar laser-fusion dating and 40 Ar/ 39 Ar step-heating methods . Potassium-Argon dating has the advantage that the argon is an inert gas that does not react chemically and would not be expected to be included in the solidification of a rock, so any found inside a rock is very likely the result of radioactive decay of potassium.

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