Radiometric dating of meteorites from another solar system
Development of this process was aided by German chemists Otto Hahn and Fritz Strassmann, who later went on to discover nuclear fission in December 1938.
The utility of the rubidium–strontium isotope system results from the fact that Sr with a half-life of 48.8 billion years.
The resulting Rb-Sr ratios and Rb and Sr abundances of both the whole rocks and their component minerals will be markedly different.
This, thus, allows a different rate of radiogenic Sr to evolve in the separate rocks and their component minerals as time progresses.
A Rb-Sr date which is at variance with other geochronometers may not be useless, it may be providing data on an event which is not representing the age of formation of the rock.In a related article on geologic ages (Ages), we presented a chart with the various geologic eras and their ages.In a separate article (Radiometric dating), we sketched in some technical detail how these dates are calculated using radiometric dating techniques.Strontium isotope stratigraphy relies on recognised variations in the Sr ratio of seawater over time.The application of Sr isotope stratigraphy is generally limited to carbonate samples for which the Sr seawater curve is well defined.