Re-evaluating the age of the Haughton impact event

Details Re-evaluating the age of the Haughton impact event Re-evaluating the age of the Haughton impact event

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005m%26ps...40.1777s&link_type=abstract

Meteoritics, vol. 40, Issue 12, p.1777-1787

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16

Scientific paper

We have re-evaluated the published age information for the Haughton impact structure, which was believed to have formed ˜23 Ma ago during the Miocene age, and report new Ar/Ar laser probe data from shocked basement clasts. This reveals an Eocene age, which is at odds with the published Miocene stratigraphic, apatite fission track and Ar/Ar data; we discuss our new data within this context. We have found that the age of the Haughton impact structure is ˜39 Ma, which has implications for both crater recolonization models and post-impact hydrothermal activity. Future work on the relationship between flora and fauna within the crater, and others at high latitude, may resolve this paradox.

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