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  2. Uranium–lead dating - Wikipedia

    en.wikipedia.org/wiki/Uraniumlead_dating

    Uranium–lead dating, abbreviated U–Pb dating, is one of the oldest [1] 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. [2] [3] The method is usually applied to zircon.

  3. Clair Cameron Patterson - Wikipedia

    en.wikipedia.org/wiki/Clair_Cameron_Patterson

    Zircon is extremely useful for geological dating: when forming, it collects tiny imperfections of uranium, but never lead. It follows that if lead is present in zircon, it must have come from decay of the uranium present. (The process is known as U-Pb dating.) The team measured the concentrations and isotopic compositions of foreign elements ...

  4. Category:Radiometric dating - Wikipedia

    en.wikipedia.org/wiki/Category:Radiometric_dating

    Uranium–lead dating; Uranium–thorium dating; Uranium–uranium dating This page was last edited on 16 February 2022, at 02:25 (UTC). Text is available under ...

  5. Radiometric dating - Wikipedia

    en.wikipedia.org/wiki/Radiometric_dating

    One of its great advantages is that any sample provides two clocks, one based on uranium-235's decay to lead-207 with a half-life of about 700 million years, and one based on uranium-238's decay to lead-206 with a half-life of about 4.5 billion years, providing a built-in crosscheck that allows accurate determination of the age of the sample ...

  6. Geochronology - Wikipedia

    en.wikipedia.org/wiki/Geochronology

    Monazite geochronology is another example of U–Pb dating, employed for dating metamorphism in particular. Uranium–lead dating is applied to samples older than about 1 million years. Uranium–thorium dating. This technique is used to date speleothems, corals, carbonates, and fossil bones. Its range is from a few years to about 700,000 years.

  7. Lead–lead dating - Wikipedia

    en.wikipedia.org/wiki/Leadlead_dating

    Leadlead dating is a method for dating geological samples, normally based on 'whole-rock' samples of material such as granite.For most dating requirements it has been superseded by uranium–lead dating (U–Pb dating), but in certain specialized situations (such as dating meteorites and the age of the Earth) it is more important than U–Pb dating.

  8. Isotopes of uranium - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_uranium

    Uranium-238 is an alpha emitter, decaying through the 18-member uranium series into lead-206. The decay series of uranium-235 (historically called actino-uranium) has 15 members and ends in lead-207. The constant rates of decay in these series makes comparison of the ratios of parent-to-daughter elements useful in radiometric dating. Uranium ...

  9. Bertram Boltwood - Wikipedia

    en.wikipedia.org/wiki/Bertram_Boltwood

    He established that lead (the metal) was the final decay product of uranium, noted that the lead-uranium ratio was greater in older rocks and, acting on a suggestion by Ernest Rutherford, he was the first to measure the age of rocks by the decay of uranium to lead, in 1907. He obtained results of 400 to 2200 million years, the first successful ...