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Rb-Sr can then be used on the altered mineralogy to date the time of this alteration, but not the date at which the rock formed.

Thus, assigning age significance to a result requires studying the metasomatic and thermal history of the rock, any metamorphic events, and any evidence of fluid movement.

It has the same number of protons, otherwise it wouldn't be uranium.The Sr87/Sr86 ratio for each sample is plotted against its Rb87/Sr86 ratio on a graph called an isochron.If these form a straight line then the samples are consistent, and the age probably reliable.The formula for the fraction remaining is one-half raised to the power given by the number of years divided by the half-life (in other words raised to a power equal to the number of half-lives).If we knew the fraction of a radioactive element still remaining in a mineral, it would be a simple matter to calculate its age by the formula To determine the fraction still remaining, we must know both the amount now present and also the amount present when the mineral was formed.