Radioactive dating igneous rocks

It is captivating and compelling…covers all the bases. Although the subject of radioisotope dating may seem a bit complicated, the dating method is rather straightforward. However, these methods make the following assumptions: a constant rate of decay, a closed geologic system, and known amount of isotopes at the beginning. Isotopes are several different forms of the same element. An isotope of uranium can decay into an isotope of another element at a certain rate. For example, uranium parent isotope decays into thorium, which itself is unstable, and the process continues until the atom changes into lead daughter isotope , which is stable.
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Why is it difficult to date sedimentary rocks using radiometric dating techniques?

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Radiometric Age Dating - Geology (U.S. National Park Service)

One of the most frequent questions a Palaeobotanist or Palaeontologist hears concerns the method for dating sediments containing fossil plants and animals. Present knowledge is based on a long series of efforts to date the ages of various rocks. At the present time, the best absolute dating involves the use of naturally occurring radioactive isotopes contained in various minerals that make up a rock. It was demonstrated that there are radioactive isotopes of certain elements that decay at a constant rate irrespective of heat, pressure and any other factor in the environment.
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Radiometric Dating: Definition, How Does it Work, Uses & Examples

These elements include the members of the radioactive decay series and and the radioactive isotope. The content of other radioactive isotopes does not significantly affect the total radioactivity of rocks because the rate of radioactive decay of these isotopes is extremely low. Furthermore, decay products of radioactive elements are present in rocks and sometimes migrate to surrounding rock and form streams of underground gases He, Ar. Radon, which is of radiogenic origin, accumulates in soils. Among igneous rocks, persilicic types have the greatest radioactivity U—3.
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Samarium—neodymium dating is a radiometric dating method useful for determining the ages of rocks and meteorites , based on the radioactive decay of a long-lived samarium isotope Sm to a radiogenic neodymium isotope Nd. Neodymium isotope ratios together with samarium-neodymium ratios are used to provide information on age information and the source of igneous melts. It is sometimes assumed that at the moment when crustal material is formed from the mantle the neodymium isotope ratio depends only on the time when this event occurred, but thereafter it evolves in a way that depends on the new ratio of samarium to neodymium in the crustal material, which will be different from the ratio in the mantle material.
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