Get Absolute Age Determination: Physical and Chemical Dating PDF

By Prof. Dr. Mebus A. Geyh, Prof. Dr. Helmut Schleicher (auth.)

ISBN-10: 3540512764

ISBN-13: 9783540512769

ISBN-10: 3642748260

ISBN-13: 9783642748264

With the starting to be reputation over the past centuries that the Earth has a tremendous age and tactics over lengthy sessions of time have replaced the morphology and composition of the Earth's crust, geologists became more and more attracted to decision of absolute a long time. A rela­ tive geochronology used to be proven at the foundation of the lithostratigraphic and biostratigraphic rules built over the past century. With the invention of radioactivity, the foundation for a brand new geoscientific self-discipline - geochronology - was once proven (Rutherford 1906). it's the examine of geological time, established typically at the time signatures supplied by means of the isotopic composition in geologic fabrics. The isotopic signature in a rock yields additional information than that supplied through the geochemical signature by myself since it displays the beginning and background of the point within the rock. the purpose of geochronology is to calibrate and standardize chronostrati­ photo scales, to increase geological time scales that experience a delicate or at the very least worthwhile solution in an effort to position the geological occasions within the right chronological order, and to assign their right time spans. In perform, the applying of geochronology is way wider as the information within the "natural information" frequently supply info at the foundation, genesis, and historical past of the fabrics. This, after all, calls for an knowing of the geochemical habit of the components involved.

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Additional resources for Absolute Age Determination: Physical and Chemical Dating Methods and Their Application

Sample text

In geochronology, the easy-to-understand parameter half-life 't is used in preference to the decay constant A. The half-life is the time in which half of the originally present nuclei decay. 50+---~ e! 2 3 4 number of half Iifes 5 6 Fig. 2. The three main possibilities for radiometric dating: a the decrease in isotope concentration resulting from radioactive decay of the parent isotope as a function of time (the radioactive activity decreases by a factor of two with each half-life; b the increase in the concentration of the radiogenic daughter nuclide; the approach of saturation conditions in a closed system when the radionuclide with a decay constant A.

3) Radioactive decay is excellently suited for dating methods because it is not influenced by temperature, pressure, or chemical environment. The individual radiometric dating methods utilize the characteristics of various radionuclides (App. B). The methods based on the ratio of atoms of radioactive parent isotope to stable daughter isotope assume that at the time of the formation ofthe rock, mineral or meteorite, the parent and daughter nuclides were either completely separated from one another or the amount of daughter isotope originally present can be estimated.

Roth et al. 1985, 1989; Faure 1986). The basic principles of these methods are discussed in this chapter. It has been known since 1907 that the atoms of a chemical element can have different masses. Atoms of the same element with different masses are called isotopes. For example, carbon has three natural isotopes with mass numbers 12, 13, and 14. , they do not change with time. ) to other isotopes or to a lower energy level. For example, radiocarbon decays to a stable isotope of nitrogen. Particle or electromagnetic radiation is emitted during the radioactive decay of radionuclides.

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Absolute Age Determination: Physical and Chemical Dating Methods and Their Application by Prof. Dr. Mebus A. Geyh, Prof. Dr. Helmut Schleicher (auth.)


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