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Ar) dating is a radiometric dating method invented to supersede potassium-argon (K/Ar) dating in accuracy.The older method required splitting samples into two for separate potassium and argon measurements, while the newer method requires only one rock fragment or mineral grain and uses a single measurement of argon isotopes. The sample is then degassed in a high-vacuum mass spectrometer via a laser or resistance furnace.Dating of movement on fault systems is also possible with the Ar method.Different minerals have different closure temperatures; biotite is ~300°C, muscovite is about 400°C and hornblende has a closure temperature of ~550°C.

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Samples are loaded into special holders and placed into infrared (IR) or ultraviolet laser chambers (UVLC) such that argon isotopes can be released from single grains and whole-rock samples by incremental heating and fusion or by spatially controlled ablation when mineral separation is impossible or in cases when we wish to analyze mineral inclusions, overgrowths, or preserve textural relationships. This technique allows the errors involved in K-Ar dating to be checked.Argon–argon dating has the advantage of not requiring determinations of potassium.Modern methods of analysis allow individual regions of crystals to be investigated.This method is important as it allows crystals forming and cooling during different events to be identified.Dating minerals may provide age information on a rock, but assumptions must be made.

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