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About

Uranium–lead dating

Therefore igneous rocks of granitic composition are more enriched in U and Th than basaltic or ultramafic rocks Consequently, the continental crust has more U and Th than the upper mantle. Similar to previous systems, the decay equations can be solved if the concentrations of U, Th and Pb are determined along with the isotopic composition of Pb. Therefore in theory, you end up with three independent dates based on three separate decay systems. The mineral has remained closed to U, Th and Pb and all intermediate daughters throughout its history Correct values are used for the initial Pb isotope ratios The decay constants of U, U and Th are known accurately The isotopic composition of U is normal and has not been modified by isotope fractionation or by the occurrence of a natural chain reaction based on fission of U. All analytical results are accurate and free of systematic errors. This ratio is insensitive to recent lead loss, ie when the Pb that was lost had the same isotope composition as the Pb that remained in the mineral being analysed. It can indicate the time of Pb-loss if Pb loss is episodic, ie occurs as a single event If however Pb-loss occurs via continuous diffusion then the lower intercept has less meaning Monazite sometimes displays U-loss which causes it to plot above the concordia curve on an extrapolation of the discordia line 25 A Real Example 26 An Alternative to Concordia Diagrams — The Terra-Wasserburg Plot In the previous example, we could see a variety of different points.

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Furthermore, the half life of the parent isotope is much longer than any of the intermediary daughter isotopes, thus fulfilling the requirements for secular equilibrium Section 2. We can therefore assume that the Pb is directly formed by the U, the Pb from the U and the Pb from the Th. The U-Th-Pb method Section 5. The ingrowth equations for the three radiogenic Pb isotopes are given by: The corresponding age equations are:

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Box , Beijing , P. The advantages include high spatial resolution, high sample throughput, good precision and accuracy, and limited sample preparation. For the application of these techniques in U—Th—Pb geochronology, the main challenges involve ion counter drift, matrix differences between reference materials and samples, laser-induced downhole elemental fractionation and common lead corrections. We review recent efforts to improve spatial resolution, calibrate ion counter drift, and correct for common lead contamination, elemental fractionation and matrix mismatching. Introduction Accurate U—Th—Pb geochronology of accessory minerals e.

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GEOCHRONOLOGY 2006 Lecture 04 U-Th-Pb Dating

Decay routes[ edit ] The above uranium to lead decay routes occur via a series of alpha and beta decays, in which U with daughter nuclides undergo total eight alpha and six beta decays whereas U with daughters only experience seven alpha and four beta decays. The term U—Pb dating normally implies the coupled use of both decay schemes in the 'concordia diagram' see below. However, use of a single decay scheme usually U to Pb leads to the U—Pb isochron dating method, analogous to the rubidium—strontium dating method. Finally, ages can also be determined from the U—Pb system by analysis of Pb isotope ratios alone.

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