Note that the mere existence of these assumptions do not render the simpler dating methods entirely useless.
The simplest form of isotopic age computation involves substituting three measurements into an equation of four variables, and solving for the fourth.
3) No contamination occurs: I can't help refute this as Wisconsin dating is supposed to get rid of this assumption, but I'm not sure if isochron dating is really valid.
My point is that he only tried to refute the third assumption, and poorly too I think, but you still have 1) and 2) to make your case.
Back to the reference to this work Faure, Gunter, 1986.
"Influences of the nature of the initial Rb-Sr system on isochron validity" in Chemical Geology (Isotope Geoscience Section) 80, pp.
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Isochron methods are first introduced in Chapter 6 (specifically pp.
According to theory, the sample starts out with daughter isotopes present at constant ratios in relation to one another, but with the parent isotope the ratio is arbitrary.
However, the methods must be used with care -- and one should be cautious about investing much confidence in the resulting age...especially in absence of cross-checks by different methods, or if presented without sufficient information to judge the context in which it was obtained.