Proton microprobe for chemical dating of monazite
Analyzed monazite is characterized by mosaic zoning rather than simple core-to-rim growth, and strontium contents of up to 750ppm.
It can be used to date rocks that formed from about 1 million years to over 4.5 billion years ago with routine precisions in the 0.1–1 percent range.
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An ion-microprobe calibration curve involving elemental and oxide species of Th and Pb (i.e., improves the accuracy of the calibration to about ±10%.
Even though this level of uncertainty is substantially greater than that expected for U-Th-Pb ionmicroprobe analyses of zircon or monazite, Th-Pb ages of allanite can still be used to address important geologic questions.