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The ability of crystalline zircon (ZrSiO4) to incorporate and retain trace element and isoto-pic information, due to sluggish diffusion, makes it an indispensable tool for geochemists and geochronologists (Valley, this volume; Cherniak and Watson, this volume) in deciphering the Earth’s geologic history. The stability of crystalline zircon over long periods of geologic time led
John M. Hanchar (Wed,) studied this question.