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Uranium 238 dating rocks


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Radiometric Age Dating

Then the system has to remain closed for a long time. By taking enough measurements of the concentrations of P, D, and N, we can solve for c1 and c2, and from c1 we can determine the radiometric age of the sample. The impression I have is that geologists are continually looking for new methods, hoping to find something that will avoid problems with existing methods. How do their ages agree with the assumed ages of their geologic periods? Now, after the magma is thoroughly mixed, the uranium and thorium will also be thoroughly mixed. I would suppose that in magma, due to reactions, most of the uranium would end up in the most stable compounds with the highest melting points.

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But many minerals take in a lot of uranium. Current theories suggest that the universe is either accelerating or decelerating depending on who you believe. The vast majority of atoms in the universe are hydrogen atoms. Mantle material is very low in uranium and thorium, having only 0. Geological Survey ; WebGeology. Geologists use these dates to further define the boundaries of the geologic periods shown on the geologic time scale. Later we will see that mixing of two kinds of magma, with different proportions of lead isotopes, could also lead to differences in concentrations.

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From my reading, isochrons are generally not done, as they are expensive. So this implies some kind of chemical fractionation. Most of the lead found in zircon comes from decay of uranium, so a determination of the ratio of uranium to lead allows estimation of the age of zircon-containing rock. 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.

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Uranium-234–uranium-238 dating

Most of the uranium deposits in Wyoming are formed from uraniferous groundwaters derived from Precambrian granitic terranes. The above two-source mixing scenario is limited, because it can only produce isochrons having a fixed concentration of N p. Also, substances with a higher melting point will tend to crystallize out at the top of a magma chamber and fall, since it will be cooler at the top.

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