Sedimentation and Stratigraphy

Jun 28th, 2015
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Chronostratigraphy: Numerical or absolute dating There are many methods, each with its own strengths and limitations: • Varves • Dendrochronology • Thermoluminescence dating

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GEOL342: Sedimentation and StratigraphySpring 2011Chronostratigraphy:Numericalorabsolutedating There are many methods, each with its own strengths and limitations:VarvesDendrochronologyThermoluminescence datingFission track datingCosmogenic nuclide datingAmino acid racemizationTephrachronologyAstronomical dating/Milankovitch cyclesRadiometric datingRadiometric dating Antoine Becquerel(1852-1908): Discovered natural radioactivity (1896). In the following years, a large number of radioactive isotopes and their daughter products became known. Pierre(1859-1906) andMarie(1867-1934)Curie: Discovered that the radioactive elementradiumcontinuously releases newly generated heat -radiogenic heat. With this discovery, it became clear that the decay of radioactive substances provided a continuous source of new heat that Thomson hadn't accounted for. The Earth might, indeed, bemucholder than his calculations indicated.But how old?History:At the beginning of the 20th century,Ernest RutherfordandFrederick Soddydeveloped the concept of thehalf-life - For any radioactive substance, there is a specific period of time in which half of a sample will decay to a daughter substance.E.G., if we have a newly created 1 kg. sample of a substance whose half-life is 10 years, then ten years from its creation, half of the radioactive material will remain in the sample. The other half will be the daughter product. After twenty years, 0

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