Radiometric Dating Of Rocks

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Radiometric dating . Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks . Radioactive elements decay . The universe is full of naturally occurring radioactive elements . Radioactive atoms are inherently unstable; over time, radioactive "parent atoms" decay into stable . . .
Technique used to date materials such as rocks or carbon . 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 . The method compares the abundance of a naturally occurring . . .
Igneous rocks and high-grade metamorphic rocks are the most likely to be entirely formed of minerals that crystallized when the rocks formed . 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 .
Radiometric dating of rocks and minerals using naturally occurring, long-lived radioactive isotopes is troublesome for young-earth creationists because the techniques have provided overwhelming evidence of the antiquity of the earth and life .
Dated materials . Uranium-238 . Lead-206 . 4 .5 billion . Zircon . Uranium-235 . Lead-207 . 704 million . Rubidium-87 . Strontium-87 . 48 .8 billion . Many rock -forming minerals (e .g ., biotite, muscovite, amphibole, and Potassium feldspar) Whole crushed metamorphic or igneous rock . Potassium-40 . Argon-40 . 1 .25 billion
Potassium-Argon (40 K-40 Ar) has been the most widespread method of radioactive age- dating for the Phanerozoic rocks , where most fossils occur . The misdated rocks shown above violate the initial condition assumption of no radiogenic argon (40 Ar) present when the igneous rock formed .
Radiometric dating is the only technique that can provide absolute ages of rocks through the stratigraphic record, but it is limited in application by the types of rocks which can be dated . The age of formation of minerals is determined by this method, so if orthoclase feldspar grains in a sandstone are dated radiometrically, the date obtained . . .
Radiometric Dating . Radiometric dating , often called radioactive dating , is a technique used to determine the age of materials such as rocks . It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates .
Fossils are almost never dated by radiometric methods, since they rarely contain suitable radioactive elements . A common way of dating fossils (and rocks which do not contain radioactive elements) is by " dating " an associated volcanic rock . This is commonly done using the K-Ar method .
Potassium-argon dating is a form of isotopic dating commonly used in paleontology . Scientists use the known natural decay rates for isotopes of potassium and argon to find the date of the rocks . The radioactive isotope converts to a more stable isotope over time, in this case decaying from potassium to argon .
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