Double dating zircons

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Uranium—lead datingabbreviated U—Pb datingis one of the oldest [1] and most refined of the radiometric dating schemes.

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Earthquake Research Institute, the University of Tokyo. Using the double-dating approach, we have conducted fission-track FT and U-Pb age dating on the same zircon grain to evaluate the reliability of the resulting age data. The resulting U-Pb age of 33 Ma was concordant with the FT age data, suggesting that there was no significant loss of Pb during etching or chemical preparation, thus indicating the feasibility of FT and U-Pb double dating of single zircon grains. The results indicate that the zircon grains OD-3 from the Kawamoto Granodiorite Mihara Body can become a new working standard for precise U-Pb age determinations of young zircons.

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