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For 18 samples there are no significant differences at the 95% confidence level between the K sbnd Ar ages obtained by these two techniques; for one sample the difference is 4.3% and is statistically significant. of Geological and Geophysical Sciences, Princeton University, Princeton, NJ 08544, USA), AB(Dept. of New Mexico, Albuquerque, NM 87131, USA), AC(Dept. of New Mexico, Albuquerque, NM 87131, USA), AD(Ion-Solid Interaction and Defect Physics Group, MS1056, Dept.

Incremental step apparent ages will increase with the fraction of Ar released as the potassium feldstar lamellae degas.By comparing the proportion of K-40 to Ar-40 in a sample of volcanic rock, and knowing the decay rate of K-40, the date that the rock formed can be determined.Potassium (K) is one of the most abundant elements in the Earth's crust (2.4% by mass).The 40Ar/39Ar technique is a powerful geochronological method derived from the K/Ar technique that can help to unravel the evolution of the.Isotopic dating of geological samples using the K/Ar method and its variant, the 40Ar/39Ar dating technique, provides ages that in favourable.

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