Uranium-Lead Radiometric Dating

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Uranium-lead dating . 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) .
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 .
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 .
One common radiometric dating method is the Uranium-Lead method . This involves uranium isotopes with an atomic mass of 238 . This is the most common form of uranium . It decays by a 14-step process into lead -206, which is stable . Each step involves the elimination of either an alpha or a beta particle . Therefore the process is:
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 . . .
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