Teaching radiometric dating

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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.

Ar–Ar dating is a similar technique which compares isotopic ratios from the same portion of the sample to avoid this problem.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.There are two basic approaches: relative age dating, and absolute age dating.Here is an easy-to understand analogy for your students: relative age dating is like saying that your grandfather is older than you.

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