How Does U-Pb Zircon Dating Work

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Uranium-lead dating - Wikipedia
5 The U-Pb system - University College London
About Uranium-Lead Dating - ThoughtCo
09 .16 .2004 - Uranium/lead dating provides most accurate . . .
Uranium lead method of rock dating - SlideShare
Radiometric Dating - Tulane University
Uranium-lead dating | Britannica
Dating - Importance of zircon in uranium-lead dating . . .
PDF The closure temperature(s) of zircon Raman dating
How to calculate the degree of discordance of zircon ages?
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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 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 . . .
As a provenance tracer, zircon U-Pb data are less susceptible to winnowing effects than conventional petrographic techniques . Using modern microprobe technology (SIMS and LA-ICP-MS, see Chapter 3 .1), it is quite easy to date, say, a hundred grains of zircon in a matter of just a few hours . Due to the robustness of zircons as a tracer of sedimentary provenance, and the relative ease of dating them, the use of detrital zircon U-Pb geochronology has truly exploded in recent years .
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) .
Despite these treatments, the U/Pb method still produced a wide range of dates for zircons from the same layer of ash . Mattinson's idea was to first heat or anneal the zircons , sealing off the least damaged areas of the crystal, then using a strong reagent, hydrofluoric acid, to eat away the heavily damaged areas .
This method has almost exclusively been used for U-Pb dating of zircons , while other geochronologically important minerals (e .g . monazite) have been only been dated using 207 Pb /206 Pb method . Electron probe micro analyzer: Electron Microprobe analysis makes it possible to determine the Th, U and Pb concentrations in an area less than few µ meter (e .g . 5 µ) across in a single grain of monazite and zircon .
If all of the meteorites formed at the same time and have been closed to U and Pb since their formation, then we can use the Pb - Pb isochron to date all meteorites . First, however, we need to know the initial ratios of the Pb isotopes . We recognize two major types of meteorites: Fe- meteorites and stony (or chondritic) meteorites
In dating : Analysis of separated minerals . In uranium-lead ( U-Pb ) dating of zircon , the zircon is found to exclude initial lead almost completely . Minerals too are predictable chemical compounds that can be shown to form at specific temperatures and remain closed up to certain temperatures if a rock has been reheated or altered .… Read More
The mineral zircon adds three more fundamental advantages to uranium-lead dating . First, its crystal structure allows a small amount of tetravalent uranium to substitute for zirconium but excludes with great efficiency the incorporation of lead . (It might be said that one begins with an empty box .)
B . Härtel et al .: The closure temperature(s) of zircon Raman dating 261 Figure 1 . Raman spectrum of an unannealed, radiation-damaged zircon (black, damage density ˇ80 1016 /g, calculated after Váczi and Nasdala, 2017) compared with the spectra after its cumulative annealing for 1h at 600, 1h at 700, and 1h at 800 C (red), and additional heating for two 1h steps at 900 and 1000 C (orange) .
Actually, in the Philippines, we I do most work , we have very few zircons in the "critical" range, most are younger than 400 Ma or older than 1 .6 Ga . . . . I wish to separate zircon for U-Pb dating . . .
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How Does U-Pb Zircon Dating Work