Uranium Lead Radiometric Dating
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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 long half-life of the isotope uranium -238 (4 .51×10 9 years) makes it well-suited for use in estimating the age of the earliest igneous rocks and for other types of radiometric dating , including uranium -thorium dating and uranium - uranium dating . Uranium-lead dating is based on the measurement of the first and the last member of the uranium series, which is one of three classical radioactive series beginning with naturally occurring uranium -238 .
Uranium-Lead (U-Pb) dating is the most reliable method for dating Quaternary sedimentary carbonate and silica, and fossils particulary outside the range of radiocarbon . Quaternary geology provides a record of climate change and geologically recent changes in environment .
Lead atoms created by uranium decay are trapped in the crystal and build up in concentration with time . If nothing disturbs the grain to release any of this radiogenic lead , dating it is straightforward in concept . In a 704-million-year-old rock, 235U is at its half-life and there will be an equal number of 235U and 207Pb atoms (the Pb/U ratio is 1) .
Uranium-lead (hereafter U-Pb) radioisotope dating is now the preferred absolute dating method among geochronologists (geologists whose field of research is in dating earth materials: rocks, rock layers, fossils, etc .) . But there are several problems with this particular radiometric dating method .
Uranium-Lead dating is a radiometric dating method that uses the decay chain of uranium and lead to find the age of a rock . As uranium decays radioactively, it becomes different chemical elements until it stops at lead . The reason for stopping at lead is because lead is not radioactive and will not change into a different element .
Dating : The uranium-lead radiometric dating scheme is one of the oldest available, as well as one of the most highly respected . It has been refined to the point that the error in dates of rocks about three billion years old is no more than two million years .
Of course, any process that tends to concentrate or deplete uranium or thorium relative to lead would have an influence on the radiometric ages computed by uranium-lead or thorium- lead dating . Also, the fact that there are two kids of magma could mean that the various radiometric ages are obtained by mixing of these kinds of magma in different proportions, and do not represent true ages at all .
Uranium-Lead (U-Pb) dating is the go-to method for dinosaur age samples, being able to accurately date rocks (yes, rocks, we'll come to that later) between 1 million and 4 .5 billion years old 3 . Two decay chains are measured in this type of radiometric dating , 238 U → 206 Pb and 235 U → 207 Pb, via a cascade of alpha and beta decay with half-lives of around 4 .5 billion years and 700 million years, respectively 4 .
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Uranium Lead Radiometric Dating
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