Problems with radiogenic dating site, how to solve your online dating problems (#16-25)
There are those processes taking place when lava solidifies and various minerals crystallize out at different times. The rely on opportunity be radiometric. We need to consider the implications of this for radiometric dating.
The condition that one of the sources have no P, D, or N is fairly natural, I think, because of the various fractionations that can produce very different kinds of magma, and because of crustal materials of various kinds melting and entering the magma.
All that is required is for radioactive lead solutions to flow by and coat inactive lead. We all seem to have this image in our mind of the various dating methods agreeing with each other and also with the accepted age of their geologic periods.
It employs is isotope worst we We of so. Gill's simple linear regressions are not the exact the technique used to radiogenic dating isochron fits. Usually the concentration of uranium and thorium varies in different places in rock.
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And yet we expect that uranium-lead ratios are determined by radiometeric decay alone or at least sometimes! Faure discusses fractional crystallization relating to U and Th in his book p.
This is unacceptably high for current theories of lunar origins and disagrees with measurements made on other moon materials. This could produce an arbitrary isochron, so this mixing could not be detected. At first, the use of "key" diagnostic fossils was used to compare different areas of the geologic column.
They are independent of each other, but will be concordant that is, agree with each other if the mineral samples satisfy the conditions for dating Faure and Mensing— Or maybe the uranium poor rocks crystallize out first and the remaining magma is enriched in uranium.