Radiometric Dating Age Of Rocks

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Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks . The universe is full of naturally occurring radioactive elements . Radioactive atoms are inherently unstable; over time, radioactive "parent atoms" decay into stable "daughter atoms ."
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 .
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 .
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 . . .
If these assumptions that underlie radiometric dating are not true, then the entire theory falls flat, like a chair without its four legs . 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 . . .
Uranium-lead radiometric dating involves using uranium-235 or uranium-238 to date a substance's absolute age . This scheme has been refined to the point that the error margin in dates of rocks can be as low as less than two million years in two-and-a-half billion years .
Radiometric dating has been demonstrated to give wrong age estimates on rocks whose age is known . Yet, secularists continue to assume that it gives correct age estimates on rocks of unknown age . We now have a good idea why most radiometric dating methods give inflated ages : there was at least one episode of accelerated radioactive decay in . . .
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 igneous rocks .
Andrew Snelling proves the accuracy of radiometric dating in one graphic . September 15, 2014 . by ageofrocks . 10 Comments . Andrew Snelling overviews 64 years of research on the decay of 87Rb, only to show that we know its decay rate very accurately . Therefore, radiometric dates are likely trustworthy . Read Article → .
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 Dating Age Of Rocks

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