First absolute dating the accuracy of these methods have thought that the ages to fit your needs. Researchers who work with prehistoric tools made from flint — a hardened form of quartz — often use thermoluminescence TL to tell them not the age of the rock, but of the tool. How big is a vicinity? Principles and applications of geochemistry: Time is not a direct measurement. In practice, geologists carefully select what rocks they will date, and have many explanations for discordant dates, so it's not clear how such a study could be done, but it might be a good project for creationists.
So one could argue that any variations in Pb ratios would have to result from radioactive decay.
Everything Worth Knowing About ... Scientific Dating Methods
Chinese Japanese Korean Vietnamese. Subducted oceanic plates begin to melt when they reach depths of about kilometers See Tarbuck, The Earth, p. Exposure to sunlight or heat releases these charges, effectively "bleaching" the sample and resetting the clock to zero. The mineral makeup of an igneous rock is ultimately determined by the chemical composition of the magma from which it crystallized. There are those processes taking place when lava solidifies and various minerals crystallize out at different times.