To make the numbers very easy to read (and fast to draw)

To make the numbers very easy to read (and fast to draw)

Contamination – parent isotope

Gain or lack of P changes the X-values regarding the information points:

Figure 6. Gain or loss in P.

, the examples in this paper include few data points. The best ones include a larger quantity of data while isochrons are performed with that few data points. In the event that isochron line has a distinctly non-zero slope, and an extremely large numbers of information points, the nearly inevitable results of contamination (failure for the system to remain closed) should be that the fit associated with the information up to a line is likely to be damaged.

As an example, think about an event which eliminates P. The information points will have a tendency to go varying distances, for the various minerals may have varying opposition to loss in P, in addition to varying degrees of Di:

Figure 7. Lack of P in most examples

The result is that the information are almost specific not to ever stay colinear:

Non-colinear data” Figure 8. Loss in P kills the fit up to a line.

Even yet in our simple four-data-point example isochron, a big change to two for the examples.

Figure 9. Migration of parent in two information points.

. Would need precise modifications to the residual two examples to allow the info to stay colinear:

Read more