Abstract
The dating of rocks contributes to our understanding of the geologic history of the Earth. Zircon is one of the most uranium-rich of the common rock-forming minerals. A single zircon grain can be dated with several geochronological methods, including U–Th–Pb, (U–Th)/He, and fission tracks (FT). The introduction of laser-ablation ICP mass spectrometry has revolutionized dating by allowing the simultaneous determination of two or all three of these ages on one zircon grain. This chapter describes the principles and applications of multi-method single-grain dating of zircon, combining the U–Pb and FT methods. This approach provides important geochronological constraints on volcanism, plutonism, and metamorphism based on the difference between the ages obtained with these methods and the geological (closure) temperatures to which each age is related.
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