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About the мovie radioisotope dating:

The initial ratio has particular importance for studying the chemical evolution of the Earth's mantle and crust, as we discussed in the section on igneous rocks. First let me note that there is a lot more going on than just mixing. The rock or mineral must have remained closed to the addition or escape of parent and daughter atoms since the time that the rock or mineral system formed. As the magma chamber is depleted in daughter products, subsequent lava flows and ash beds would have younger dates.

What radiometric dating needs to do to show its reliability is to demonstrate that no such fractionation could take place. Using such techniques, scientists can very accurately date ancient volcanic events and can extrapolate from these dates to learn about the ages of other rock strata. In fact, more is true. I now describe this mixing in more detail.


This high melting point suggests that uranium would crystallize and fall to the bottom of magma chambers. We need to see the data to know if there is really any need to explain anything away.
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Summary Natural radioactive processes are characterized by a half-life, the time it takes for half of the material to decay radioactively. Now, suppose we have an arbitrary isochron with concentrations of parent, daughter, and non-radiogenic isotope of the daughter as P p , D p , and N p at point p. With modern techniques, these ranges have gotten narrower and narrower, and consequently, even very ancient rocks can be dated quite precisely. And what does one mean by the vicinity of the rock?
Then you have to remember that sometimes one has repeated melting and solidification, introducing more complications. Fractionation followed by mixing can create isochrons giving too old ages, without any fractionation of daughter isotopes taking place. The answers to all of these questions lie in our understanding of the geologic processes that affect the deposition of radioactive elements. I read that zircons absorb uranium, but not much lead. Load Previous Page Principles of isotopic dating All absolute isotopic ages are based on radioactive decay , a process whereby a specific atom or isotope is converted into another specific atom or isotope at a constant and known rate.

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