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Such determinations are called model ages because the initial ratio is predicted by a model rather than measured directly.Sr method was extended to less exotic rock-forming minerals such as biotite, muscovite and K-feldspar, with lower Rb/Sr ratios.Otherwise, the initial ratio is determined by extrapolating back to the y axis a best-fit line through the available data points (Fig. Because Sr ratio, and plot as points on a horizontal line. After each mineral has become a closed system (effectively at the same instant for the minerals in a high-level, fast-cooling intrusion) isotopic evolution begins.
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provides a good illustration of the principles of isotope dating, and will therefore be reviewed here to demonstrate those principles.
This application begins from the general equations for radioactive decay (section 1.4). However, it is difficult to measure precisely the absolute abundance of a given nuclide.
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