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- USA However, if strontium 87 was present in the mineral when it was first formed from molten magma, that amount will be shown by an intercept of the isochron lines on the y-axis, as shown in Fig Commons category link is on Wikidata. This then causes orthoclase and biotite, both K rich minerals into which Rb can substitute, to precipitate. For an isochron to be valid, each sample tested must 1 have had the same initial ratio, 2 have been a closed system over geologic time, and 3 have the same age.
The technique is highly responsive to thermal events in a relatively predictable fashion, so the cooling history of a region may be established.