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. The dating method is usually performed on the mineral zircon.
The mineral incorporates uranium and thorium atoms into its crystal structure , but strongly rejects lead. Therefore, one can assume that the entire lead content of the zircon is radiogenic , i. Thus the current ratio of lead to uranium in the mineral can be used to determine its age.
The method relies on two separate decay chains , the uranium series from U to Pb, with a half-life of 4. The above uranium to lead decay routes occur via a series of alpha and beta decays, in which U with daughter nuclides undergo total eight alpha and six beta decays whereas U with daughters only experience seven alpha and four beta decays. The existence of two 'parallel' uranium—lead decay routes U to Pb and U to Pb leads to multiple dating techniques within the overall U—Pb system.
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U-Pb Zircon Geochronology - for determining the age of a rock
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Why are white guy/oriental girl relationships common but not white girl/oriental guy?geologic interest and is virtually untapped. Citation: Rasbury, E. T., and J. M. Cole (), Directly dating geologic events: U-Pb dating of carbonates, Rev. Radiometric dating is used to estimate the age of rocks and other objects based on the fixed decay rate of radioactive isotopes. Learn about half-life and how it is ..
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No experience needed in most cases! Under conditions where no lead loss or gain from the outside environment has occurred, the age of the zircon can be calculated by assuming exponential decay of Uranium. Zircon is very chemically inert and resistant to mechanical weathering—a mixed blessing for geochronologists, as zones or even whole crystals can survive melting of their parent rock with their original uranium-lead age intact.
Paleontologists now apply sophisticated mathematical techniques to assess the relative quality of particular fossil successions, as well as the entire fossil record. The upper intercept of the concordia and the discordia line will reflect the original age of formation, while the lower intercept will reflect the age of the event that led to open system behavior and therefore the lead loss; although there has been some disagreement regarding the meaning of the lower intercept ages.
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