| http://www.w3.org/ns/prov#value | - There is also such a thing as a whole rock isochron in which each sample is a rock from the same source, but each rock/sample consists of many different minerals.What is actually required is a set of co-genetic (that is, from the same source) samples in which the ratio of 87Rb (the parent isotope) to 86Sr (the non-radiogenic isotope of the radiogenic daughter isotope) differ.
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