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The shock metamorphism of rocks and minerals is an important consequence of hypervelocity impact events. Much remains to be understood regarding effects in accessory geochronology minerals, such as the effect of very high shock conditions on zircon (ZrSiO4). This study explores the effects of shock metamorphism on zircon in crystalline, quartzofeldspathic basement rocks from the ~23–39-m.y.-old, 23-km-diameter Haughton impact structure on Devon Island, Arctic Canada. This is a valuable location for this study because the structure is very well preserved and contains materials covering a wide range of shock levels. A petrographic survey of 255 zircon grains revealed...

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