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The most accurate ages are produced by samples near the y-axis, which was achieved by step-wise leaching and analysis of the samples.Previously, when applying the alternative Pb–Pb ischron diagram, the The result of U-corrected Pb–Pb dating has produced ages of 4567.35 ± 0.28 My for CAIs (A) and chondrules with ages between 4564.71 ± 0..32 ± 0.42 My (B and C) (see figure).If the sample behaved as a closed system then graphing the difference between the present and initial ratios of Pb should produce a straight line.The distance the point moves along this line is dependent on the U/Pb ratio, whereas the slope of the line depends on the time since Earth's formation. The development of the Geochron was mainly attributed to Clair Cameron Patterson’s application of Pb-Pb dating on meteorites in 1956.Chondrules and calcium–aluminium-rich inclusions (CAIs) are spherical particles that make up chondritic meteorites and are believed to be the oldest objects in the solar system.Hence precise dating of these objects is important to constrain the early evolution of the solar system and the age of the earth.Stony meteorites however, exhibited very high Pb ratios, indicating that these samples came from the crust or mantle of the planetesimal.Together, these samples define an isochron, whose slope gives the age of meteorites as 4.55 Byr.

Because the isotope composition of this sample plotted on the meteorite isochron, it suggested that earth had the same age and origin as meteorites, therefore solving the age of the Earth and giving rise to the name 'geochron'. Animation shows progressive growth over 4550 million years (Myr) of the lead isotope ratios for two stony meteorites (Nuevo Laredo and Forest City) from initial lead isotope ratios matching those of the Canyon Diablo iron meteorite.As planetesimals collided, various fragments were scattered and produced meteorites.Iron meteorites were identified as pieces of the core, while stony meteorites were segments of the mantle and crustal units of these various planetesimals.The U–Pb dating method can yield the most precise ages for early solar-system objects due to the optimal half-life of U.However, the absence of zircon or other uranium-rich minerals in chondrites, and the presence of initial non-radiogenic Pb (common Pb), rules out direct use of the U-Pb concordia method.




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