Radiometric Age Dating Of Rocks

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Sedimentary rocks can be dated using radioactive carbon, but because carbon decays relatively quickly, this only works for rocks younger than about 50 thousand years . So in order to date most older fossils, scientists look for layers of igneous rock or volcanic ash above and below the fossil .
The use of radiometric dating was first published in 1907 by Bertram Boltwood and is now the principal source of information about the absolute age of rocks and other geological features, including the age of fossilized life forms or the age of the Earth itself, and can also be used to date a wide range of natural and man-made materials .
As most fossils are found in clastic sedimentary rocks , which are made of weathered and eroded minerals and bits of rock of various ages , it is unlikely to be able to make an radiometric age determination of a rock in which a fossil is found . The age of a rock containing fossils can usually be narrowed down by measuring the ages of metamorphic or igneous rocks in stratigraphic relation to it, such as a lava flow on top of a layer of sedimentary rock .
Usually determinations of age are repeated to avoid laboratory errors, are obtained on more than one rock unit or more than one mineral from a rock unit in order to provide a cross-check, or are evaluated using other geologic information that can be used to test and corroborate the radiometric ages . Scientists who use radiometric dating typically use every means at their disposal to check, recheck, and verify their results, and the more important the results the more they are apt to be . . .
Radiometric Age Dating . Thermal ionization mass spectrometer used in radiometric dating . Radiometric dating calculates an age in years for geologic materials by measuring the presence of a short-life radioactive element, e .g ., carbon-14, or a long-life radioactive element plus its decay product, e .g ., potassium-14/argon-40 .
The second fatal flaw clearly reveals that at least one of those assumptions must actually be wrong because radiometric dating fails to correctly date rocks of known ages . For example, in the case of Mount St . Helens, we watched rocks being formed in the 1980s, but when sent to a laboratory 10 years later for dating , the 10-year-old rocks returned ages of hundreds of thousands to millions of years .
Neodymium-143 . 106 billion years . The mathematical expression that relates radioactive decay to geologic time is called the age equation and is: Dating rocks by these radioactive timekeepers is simple in theory, but the laboratory procedures are complex .
However, radiometric dating generally yields the age of metamorphism, not the age of the original rock . Most ancient sedimentary rocks cannot be dated radiometrically, but the laws of superposition and crosscutting relationships can be used to place absolute time limits on layers of sedimentary rocks crosscut or bounded by radiometrically dated . . .
With the exception of Carbon-14, radiometric dating is used to date either igneous or metamorphic rocks that contain radioactive elements such as uranium, thorium, argon, etc . And even though various radioactive elements have been used to 'date' such rocks , for the most part, the methods are the same .
The volcanic material in tuff is well-suited for radiometric dating , which uses known decay rates for specific unstable isotopes to determine the age of the rock that contains that isotope . Feldspar crystals found in the tuff layers contain an unstable isotope of potassium that can be used for this dating method .
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Radiometric Age Dating Of Rocks

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