Impact thermochronology and the age of Haughton impact structure, Canada

Kelsey E Young, Matthijs C Soest, Kip V Hodges, E Bruce Watson, Byron A Adams, Pascal Lee

Research output: Contribution to journalArticle (Academic Journal)peer-review

27 Citations (Scopus)

Abstract

Most successful efforts to determine the ages of impact events are based on the isotope geochronology of crystalline or glassy impact melts. Studies of impact sites on Earth show that many form without significant melt production, meaning that traditional geochronologic approaches can yield unsatisfying results. We describe here an alternative approach based on theoretical calculations that even brief thermal events related to impact can reset the isotopic systematics of unmelted target rocks. Thermochronometers based on the production of radiogenic 4He in accessory minerals are particularly amenable to complete resetting by impact and should yield robust impact ages if helium systematics are not further disturbed during post-impact thermal events. We illustrate the utility of this method through a presentation of a new zircon (U-Th)/He date for the Haughton impact structure, Canada, of 23.5 ± 2.0 Ma.
Original languageEnglish
Pages (from-to)3836-3840
Number of pages5
JournalGeophysical Research Letters
Volume40
Issue number15
Publication statusPublished - 2013

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