However, there are some problems with it. Thus, it provides an independent analysis of the rock that does not depend on the radioactive decay that is being studied. Magma from the ocean floor has little U and little U and probably little lead byproducts lead and lead Indications of a Solar InfluenceP. Approximately how old is the bone? The above is offered as a simple fact of research. There can also be fractionation that might treat the parent and daughter products identically, and thus preserve the isochron, while changing the concentrations so as to cause the mixing test to fail.
It is also known that uranium is highly reactive.
Growing CO2 levels are messing up radiocarbon dating
So this is a valid mixing, and we are done. Libby's groundbreaking radiocarbon dating technique instead looked at a much more rare isotope of carbon: If I have a rock X with lots of uranium and lead daughter isotope, and rock Y with less of both relative to non-radiogenic leadthen one will get an isochron with a positive slope. Believe it or not, a number of creationist attacks against radiometric decay rates are aimed at a kind of "decay" called internal conversion ICwhich has absolutely nothing to do with the radiometric dating methods Dalrymple,p. As we have seen, we cannot ignore geochemical effects while we consider geophysical effects. 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.