by Dr. Andrew A. Snelling on March 27, 2017
"This discovery and recent presentation of differential isotope diffusion as a key flaw in radioisotope isochron dating is but one more “nail in the coffin” of these radioisotope dating methods. If differential diffusion of isotopes occurs in the rocks and minerals they contain so that plotting of their analysed isotopic ratios produces straight lines indistinguishable from isochrons, then we can never be sure that true isochrons have been obtained and thus correct isochron ages." See link below.