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Once radioactive decay of U and Th started after creation, daughter Pb isotopes were added inside the earth.Then catastrophic plate tectonics during the Flood stirred the mantle and via partial melting added new rocks to the crust.He showed that there is still some uncertainty in what the values for these measures of the Rb decay rate differ when Rb-Sr ages are calibrated against the U-Pb ages of either the same terrestrial minerals and rocks or the same meteorites and lunar rocks.Ironically it is the slow decay rates of isotopes such as Sm used for deep time dating that makes precise measurements of their decay rates so difficult.However, problems remain in the interpretation of the measured Pb isotopic ratios to transform them into ages.Among them is the presence of non-radiogenic Pb of unknown composition, often referred to as common or initial Pb.U decay in those rocks added daughter Pb isotopes to the common or initial Pb isotopes in them, inherited from the rock’s sources.
Ideally, the uncertainty of the decay constants should be negligible compared to, or at least be commensurate with, the analytical uncertainties of the mass spectrometer measurements entering the radioisotope age calculations (Begemann et al. Clearly, based on the ongoing discussion in the conventional literature this is still not the case at present.
There is also primordial Pb that the earth acquired when it formed, its isotopic composition determined as that of troilite in the Canyon Diablo iron meteorite.
Subsequently new crustal rocks formed via partial melts from the mantle.
There is thus no impediment to accepting and using the Bible’s account of Creation and the Flood as a reliable framework for unravelling the history of the earth and the Pb isotopes found in its minerals and rocks.
Radioisotope dating of minerals, rocks and meteorites is perhaps the most potent claimed proof for the supposed old age of the earth and the solar system.U-Pb radioisotope dating is now the absolute dating method of first choice among geochronologists, especially using the mineral zircon.