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The laboratory has tackled various problems including the dating of ash from the Lucy Fossil site in Ethiopia to constrain Lucy’s age, and the dating of clay mineral diagenesis to constrain orogensis in both the Appalachians and Cordilleran Mountains Belts.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.

is a radiometric dating method invented to supersede potassium-argon (K-Ar) dating in accuracy.

The quantity of potassium in a rock or mineral is variable proportional to the amount of silica present.

Therefore, mafic rocks and minerals often contain less potassium than an equal amount of silicic rock or mineral.

The isotopes the KAr system relies on are Potassium (K) and Argon (Ar).

Potassium, an alkali metal, the Earth's eighth most abundant element is common in many rocks and rock-forming minerals.

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