Mixing of two sources
, whose age doesn’t have importance whatsoever. The only real reasonably typical method is by combining of materials.
Each could possibly be plotted as being an information point for an isochron diagram:
Figure 19. Position of supply product for an isochron plot.
Whenever plotted for an isochron diagram, the mixed data points are typical colinear with an and B:
Figure 20. Isochron plot of two sources that are mixed
Mixing would seem to be a pernicious issue. Since the and B can be totally unrelated to one another, their individual compositions could plot up to a rather number of places from the graph. Any slope could be had by the line AB after all.
That reality additionally permits us to make an estimate that is rough of portion of isochrons that provide colinear plots because of blending. “significant” (or “valid”) isochrons should have a zero or positive slope; “mixing” isochrons may have any slope. Then we might suspect mixing to be an explanation for a significant fraction of all apparently valid “old” isochrons as well if isochrons of negative slope (which must be mixing lines) were reasonably common. Continue reading “It’s also feasible to have an isochron with colinear information”