Arndts and Overn (8) and Kramer as well as others (78) declare that Rb-Sr isochrons would be the consequence of blending, instead of of decay of 87 Rb over long stretches:
It’s clear that blending of pre-existent materials will yield a linear variety of isotopic ratios. We are in need of perhaps maybe not assume that the isotopes, assumed become child isotopes, had been in reality stated in the stone by radioactive decay. Continue reading