One Small Speck to Man, 2nd edition. Fourth, zircon is physically tough and easily separated from crushed rock samples because of its high density. As it is, there is a general correlation of dates obtained by radiometric dating from the top to the bottom of the geologic column. I think we need something more solid than that. What do you think about this particular story?
These types of minerals often produce lower precision ages than igneous and metamorphic minerals traditionally used for age dating, but are more common in the geologic record. Such a high melting point would imply fractionation in the magma. Gulson, B. Cottle, J. However, the composition of lead isotopes between magma chambers could still differ, and lead could be incorporated into lava as it traveled to the surface from surrounding materials.
US June 20th,
Scientist Realizes Important Flaw in Radioactive Dating
Sj says: Synthesis and purification of Pb for U—Pb for geochronology. This is understood and can be corrected for. The half-lives of the cascade from uranium to lead has been been extrapolated to about million years and the cascade form uranium to lead has been calculated to about 4. This would require similar diffusion rates in cold meteorites as in warm crustal zircons. A low contamination method for hydrothermal decomposition of zircon and extraction of U and Pb for isotopic age determinations.
May 10, Understanding the Uncertainties Granite formation: Let N p be the concentration of some non-radiogenic not generated by radioactive decay isotope of D at point p. This can and must be tested. I think we need something more solid than that. I saw a reference that uranium reacts strongly, and is never found pure in nature.