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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. First of all, the dating technique assumes that upon cooling, potassium-bearing minerals contain a very tiny amount of argon (an amount equal to that in the atmosphere).While this assumption holds true in the vast majority of cases, excess argon can occasionally be trapped in the mineral when it crystallizes, causing the K-Ar age to be a few hundred thousand to a few million years older than the actual cooling age.Potassium, an alkali metal, the Earth's eighth most abundant element is common in many rocks and rock-forming minerals.The quantity of potassium in a rock or mineral is variable proportional to the amount of silica present.K-Ar ages away from spreading ridges, just as we might expect, and recent volcanic eruptions yield very young dates, while older volcanic rocks yield very old dates.

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But then, different passages in the Wikipedia article contradict each other (first section: 39-K is converted into 39-Ar by neutron bombardment; but "age equation" section: 40-K is bombarded; I think it should be 39-Ar).

In these early studies the vertical succession of sedimentary rocks and structures were used to date geologic units and events relatively.

In addition, faunal succession and the use of "key" diagnostic fossils were used to correlate lithologic units over wide geographic areas.

This relationship is useful to geochronologists, because quite a few minerals in the Earth’s crust contain measurable quantities of potassium (e.g. In theory, therefore, we can estimate the age of the mineral simply by measuring the relative abundances of each isotope.

Over the past 60 years, potassium-argon dating has been extremely successful, particularly in dating the ocean floor and volcanic eruptions.

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