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On the isochron diagram shown in the figure above, the samples would plot initially at points R1 to R3 along a line representing the initial ratio designated (87Sr/86Sr 0.
This term, shown in Figure 1, is called the initial ratio.
For an isochron to be valid, each sample tested must (1) have had the same initial ratio, (2) have been a closed system over geologic time, and (3) have the same age.
In this case, the slope of the line in Figure 1 is computed from an assumed value for the initial ratio, and it is usually possible to show that uncertainties related to this assumption are negligible.
If a number of samples are analyzed and the results are shown to define a straight line within error, then a precise age is defined because this is only possible if each is a closed system and each has the same initial ratio and age.
Table 1 shows the initial ratio of the components.
Results of numerical simulations show that a key factor is the initial ratio of 26Al/27Al.
We assume the initial ratio of S 0) = S0 and I 0) = I0.
The gas brine ratio decreases gradually from an initial ratio of 6.3 4.7 m3/m3.
Further studies on the initial ratio of 60Fe/56Fe are needed in order to consider 60Fe as a heat source.
Ito and Ganguly (2004) used a Solar System initial ratio of 60Fe/56Fe ∼ 3 × 10−7 (Tachibana and Huss, 2003).
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