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About the –ľovie uranium dating:

By analogy with the behaviour of Ra, Th and U it can be suggested that Pb, owing to its large mobility, was also fed to the magma by fluids. Many of the above authors attempt to explain these "fictitious" ages by resorting to the mixing of several sources of magma containing different amounts of Rb, Sr, and Sr immediately before the formation hardens. Geologists have tried various zircon treatments, including abrading the outer surfaces of the crystals, which are typically a tenth of a millimeter across, or leaching the crystals with strong acid.

Some are much shorter. Geologists extract the appropriate minerals from the rock in this case, zircon crystals and use a technique called mass spectrometry to figure out the relative amounts of uranium and lead in the zircon. Thus its radiometric age would tend to decrease rapidly with time, and lava emitted later would tend to look younger.


The open-system behaviour of Pb, if true, would have dramatic consequences Among the best-known techniques are radiocarbon dating, uranium-lead dating and potassium-argon dating. Radiometric dating rocks. The zircon formation may have occurred tens to hundreds of thousands of years before the eruption and deposition.
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One could say that some of the radiogenic lead has diffused into neighboring rocks, too. Oftentimes the rate of cooling occurs rapidly enough to prohibit the complete transformation of calcium-rich feldspar into sodium-rich feldspar. There are a number of uranium compounds with different melting points, and in general it seems that the ones with the highest melting points are more stable.
After the death of the organism, the amount of radiocarbon gradually decreases as it reverts to nitrogen by radioactive decay. The uranium-thorium dates are both more accurate and more reliable than those derived from measurements of carbon, and they cover a much longer period. Radiometric dating is largely done on rock that has formed from solidified lava. By sieving the sediments, distinguishing species that lived in the surface water from those of the deep sea, and measuring their carbon contents, Broecker has showed that the distribution of carbon differed little from what it is today. Time is one of the values that can be determined from the slope of the line representing the distribution of the isotopes.
For an example of how geologists use radiometric dating, read on: A geologist can pick up a rock from a mountainside somewhere, and bring it back to the lab, and separate out the individual minerals that compose the rock. For example, as shown at left below, uranium has a half-life of million years. Slightly different dating techniques are used with different radioactive elements, but the same basic logic of estimating backwards based on radioactive decay remains the same. However, there are some factors that must be accounted for. It works like this: Take, for example, zircon, which is a mineral; its chemical formula is ZiSiO4, so there is one zirconium Zi for one silicon Si for four oxygen O.
The uranium-thorium method is often helpful for dating finds in the 40, to ,year-old range, too old for radiocarbon but too young for K-Ar or Ar-Ar. Uranium-Thorium dating The tree-ring technique is useful for calibrating the 14C method up to about 11, years. Most of the large igneous rock masses of the world have been dated in this manner.
It is possible that the ratio of daughter to parent substances for radiometric dating could differ in the different minerals. Finally, if one only considers U-Pb and Th-Pb dates for which this test is done, and for which mixing cannot be detected. To produce isochrons having a variable N p , a mixing of three sources would suffice. Paleomagnetism is often used as a rough check of results from another dating method. Otherwise, the system is degenerate.

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