All publications more feeds BibTeX file. Aliquots of a homogenized whole rock are called whole-rock samples. Whole-rock isochrons especially those of metamorphic rocks may be disturbed.
The radioactive decay of rubidium 87 Rb to strontium 87 Sr was the first widely used dating system that utilized the isochron method. Because rubidium is concentrated in crustal rocks, the continents have a much higher abundance of the daughter isotope strontium compared with the stable isotopes. A ratio for average continental crust of about 0. This difference may appear small, but, considering that modern instruments can make the determination to a few parts in 70, it is quite significant.
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