Now lead and uranium are particularly susceptible to such shuffling in the event of even mild metamorphism.The other problem is that uranium is particularly susceptible to weathering.(1979a), but was effectively the method adopted by the earliest workers (e.g. The term refers to the fact that spontaneous and induced tracks are counted in different splits or sub-populations of material, which are nevertheless assumed to sample the same population.This depends on the material having a homogeneous distribution of uranium between the two splits.Now since all rocks are somewhat porous, and since we are pretty much obliged to date rocks from near the surface, it's hard to find instances in which uranium has not been lost.; as you can see from its chemical formula, it is one of the silicate minerals.The commonest minerals dated using this method are zircon and apatite.
The first of these, noted above, is that the induced track count is performed on identical material to the spontaneous track count.Pb (lead-204), which is neither unstable nor radiogenic.We can always try U-Pb dating using the isochron method, but this often doesn't work: the compositions of the minerals involved, when plotted on an isochron diagram, fail to lie on a straight line. First of all, the straight-line property of the isochron diagram is destroyed when the isotopes involved get shuffled between minerals.Fission track dating is somewhat of an anomaly in the field of radiometric dating.All other radiometric dating techniques rely on the relative abundances of a known parent isotope of an element and its corresponding concentration of daughter decay products.