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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. Since the argon will escape if the rock is melted, the dates obtained are to the last molten time for the rock. Since potassium is a constituent of many common minerals and occurs with a tiny fraction of radioactive potassium, it finds wide application in the dating of mineral deposits. The feldspars are the most abundant minerals on the Earth, and potassium is a constituent of orthoclase , one common form of feldspar.
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Potassium-Argon Dating Methods

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Clocks in the Rocks

If you're seeing this message, it means we're having trouble loading external resources on our website. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Donate Login Sign up Search for courses, skills, and videos. Science Biology library History of life on Earth Radiometric dating. Chronometric revolution. Potassium-argon K-Ar dating.
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Ajoy K. Leonardo da Vinci, ca. Herein, I set out some simple guidelines to permit readers to assess the reliability of published ages. I illustrate the use of the techniques by looking at published age data for hotspot tracks in the Atlantic Ocean the Walvis Ridge , as well as newly published ages for the British Tertiary Igneous Province. In these experiments, a sample is heated in steps of increasing laboratory extraction temperature, until all the argon is released.
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They are describe the timing and relationship of event occured during Earth history. GTS is a system of chronological dating that relates geological strate. Geologists have divided the history of the Earth into a series of time intervals.
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