Range of potassium argon dating scripture on teenage dating

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Thus, a granite containing all three minerals will record three different "ages" of emplacement as it cools down through these closure temperatures.

Thus, although a crystallization age is not recorded, the information is still useful in constructing the thermal history of the rock.

Different minerals have different closure temperatures; biotite is ~300°C, muscovite is about 400°C and hornblende has a closure temperature of ~550°C.The mineral sanidine, the high-temperature form of potassium feldspar, is the most desirable.But micas, plagioclase, hornblende, clays, and other minerals can yield good data, as can whole-rock analyses.The target mineral is separated using heavy liquids, then hand-picked under the microscope for the purest possible sample.This mineral sample is then baked gently overnight in a vacuum furnace.

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