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Potassium can be mobilized into or out of a rock or mineral through alteration processes.Due to the relatively heavy atomic weight of potassium, insignificant fractionation of the different potassium isotopes occurs.However, the Argon, a noble gas, constitutes approximately 0.1-5% of the Earth's present day atmosphere.

In order for an age to be calculated by the Ar technique, the J parameter must be known.

J value uncertainty can be minimized by constraining the geometry of the standard relative to the unknown, both vertically and horizontally.

The NMGRL does this by irradiating samples in machined aluminum disks where standards and unknowns alternate every other position.

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.

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