So with their encouragement I will attempt to explain the method and the criteria used to interpret the data generated from a Ar step-heating experiment.
I have just completed the data reduction on a low potassium basalt from the Medicine Lake, California, the basalt of Tionesta. Freeman and Company, San Francisco and London, 136 p.
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.
Potassium can be mobilized into or out of a rock or mineral through alteration processes.
Ar dating technique is a recently developed analytical variation of the conventional K-Ar method.
Susie Welch, recently retired outreach coordinator at the New Mexico Bureau of Geology, was recognized by Governor Susana Martinez for outstanding accomplishments and invaluable contributions to the state of New Mexico.