Dating young zircon: A case study from Southeast Asian megacrysts

U-Pb geochronology of Quaternary zircon crystals is challenging due to their low levels of radiogenic-Pb, the importance of accurate common-Pb correction, and the potential need for secular disequilibrium correction. (U-Th)/He dating offers an independent benchmark for the quality of U-Pb data and their reduction, including the various corrections, as the closure temperature of the He system in zircon is <500 °C, whereas for Pb it is >900 °C....