Radiogenic Isotope Dating

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•The Rb-Sr method is well suited for dating very old events in Earth's history . •It has been used to obtain the ages of meteorites and lunar samples, as well as some of the oldest rocks on Earth . •The Rb-Sr and other methods of isotopic dating can be applied to whole rock samples or to individual minerals separated from the rock .
Radiometric dating , radioactive dating or radioisotope dating is a technique which is used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed .
232 Th has such along half life that it is generally not used in dating . 204 Pb is a stable non- radiogenic isotope of Pb, so we can write two isochron equations and get two independent dates from the U - Pb system . (7) and (8) If these two independent dates are the same, we say they are concordant .
Physicists have measured the half-lives of most radioactive isotopes to a high level of precision . The properties of radioactive isotopes and the way they turn into their stable daughter products are not affected by variations in temperature, pressure, or chemistry . Therefore the half-lives and other properties of isotopes are unaffected by the changing conditions that a rock is subjected to as it moves through the rock cycle .
Methods of dating surface waters, groundwaters, closed reservoirs and bottom sediments are analysed . The values of the radiogenic isotopes in waters are practically independent of chemical factors . It is mainly determined by the uranium distribution in rocks of a water-bearing complex .
The following discussion is simplified from these sources . Three isotopes , 208Pb, 207Pb, and 206Pb, are partly the radiogenic daughter products from the radioactive decay of one isotope of thorium (232Th 208Pb*) and two isotopes of uranium (238U 206Pb* and 235U 207Pb*) .
GEOCHRONOLOGY AND RADIOGENIC ISOTOPES Ages of geological formations or secondary events (i .e . alteration or metamorphism) can be determined through using a Geochronology lab for the following dating methods: K-Ar, (Ar-Ar), U-Pb, Rb-Sr or Sm-Nd . These analytical procedures include several steps: Dating method selection Sample collection Sample preparation, mineral separation and treatment . . .
Isotopic dating of rocks, or the minerals in them, is based on the fact that we know the decay rates of certain unstable isotopes of elements and that these rates have been constant over geological time . It is also based on the premise that when the atoms of an element decay within a mineral or a rock, they stay there and don't escape to the surrounding rock, water, or air .
Isochron dating is a common technique of radiometric dating and is applied to date certain events, such as crystallization, metamorphism, shock events, and differentiation of precursor melts, in the history of rocks . Isochron dating can be further separated into mineral isochron dating and whole rock isochron dating ; both techniques are applied frequently to date terrestrial and also extraterrestrial rocks . The advantage of isochron dating as compared to simple radiometric dating techniques is t
Radiogenic isotopes are commonly used as tracers to indicate, the movement of substances through the environment . Radiogenic isotope tracer applications using Pb, strontium (Sr), and neodymium (Nd), among others make use of the fact that these are heavy isotopes , in contrast to lighter isotopes such as hydrogen (H), oxygen (O), and sulfur (S) . Heavy isotopes are relatively unaffected by changes in temperature and pressure during transport and accumulation, variations in the rates of chemical . . .
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Radiogenic Isotope Dating