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23-Jul-2016 10:19

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Ar atoms are able to diffuse through and escape from molten magma because most crystals have melted and the atoms are no longer trapped.Entrained argon—diffused argon that fails to escape from the magma—may again become trapped in crystals when magma cools to become solid rock again.The ratio of the amount of K which was present at the beginning of the elapsed time period.After the recrystallization of magma, more Ca being the most abundant isotope.Thus, the amount of calcium originally present is not known with enough accuracy to be able to measure the small increase produced by radioactive decay.Time since recrystallization is calculated by measuring the ratio of the amount of The quickly cooled lavas that make nearly ideal samples for K–Ar dating also preserve a record of the direction and intensity of the local magnetic field as the sample cooled past the Curie temperature of iron.The geomagnetic polarity time scale was calibrated largely using K–Ar dating.Potassium–argon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology.

Potassium is a common element found in many materials, such as micas, clay minerals, tephra, and evaporites.In these materials, the decay product Ar is able to escape the liquid (molten) rock, but starts to accumulate when the rock solidifies (recrystallizes).