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Assessment of five monazite reference materials for U-Th/Pb dating using laser-ablation ICP-MS

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CiteSeerX — in situ Th-Pb dating of monazite

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: Lafon and A. Cocherie and C. High spatial resolution dating using an electron-probe microanalyzer EPMA was employed to obtain U—Th—Pb chemical ages in monazite of seven rock samples of the Archean basement from that tectonic block, which underwent granulite- and amphibolite-facies metamorphism.
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U-Pb and Th-Pb dating of apatite by LA-ICPMS

U and Th are found on the extremely heavy end of the Periodic Table of Elements. 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.
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Despite the high U and low common Pb contents of monazite, interpretation of conventional U-Pb monazite ages is complicated by problems including inheritance, isotopic disequilibrium, recrystallization, and other open system behaviors. These problems can be circumvented by Th-Pb dating of monazite using an in situ method which provides two capabilities with unique potential to assess polymetamorphism: prograde thermochronometry and continuous thermal histories. However, neoformed monazites included in garnet immediately following growth are shielded from fluid alteration.
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