Concordia Radiometric Dating
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The Concordia is particularly useful in dating of the mineral Zircon (ZrSiO 4) . Zircon has a high hardness (7 .5) which makes it resistant to mechanical weathering, and it is also very resistant to chemical weathering .
But even the best geologic methods are imperfect . Dating a rock involves uranium-lead measurements on many zircons, then assessing the quality of the data . Some zircons are obviously disturbed and can be ignored, while other cases are harder to judge . In these cases, the concordia diagram is a valuable tool .
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 radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay . The use of radiometric dating was first published in 1907 by Bertram Boltwood and is now t
Uranium-lead dating , abbreviated U-Pb dating , is one of the oldest and most refined of the radiometric dating schemes . It can be used to date rocks that formed and crystallised from about 1 million years to over 4 .5 billion years ago with routine precisions in the 0 .1-1 percent range . The method is usually applied to zircon . This mineral incorporates uranium and thorium atoms into its crystal structure, but strongly rejects lead when forming . As a result, newly-formed zircon deposits . . .
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Concordia Radiometric Dating
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