Problems dating metamorphic rocks
Each original isotope, called the parent, gradually decays to form a new isotope, called the daughter.
Each isotope is identified with what is called a ‘mass number’.
Age control is vitally important in geological, petrogenetic, tectonic and geomorphological studies and for stratigraphic correlations.
Thus, a precise measurement of the Sr ratio in a modern volcano can be used to determine age if recycled older crust is present.
A ratio for average continental crust of about 0.72 has been determined by measuring strontium from clamshells from the major river systems.
Sr) was the first widely used dating system that utilized the isochron method.
Rubidium is a relatively abundant trace element in Earth’s crust and can be found in many common rock-forming minerals in which it substitutes for the major element .
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