Did the Manicouagan impact trigger end-of-Triassic mass extinction?

Details Did the Manicouagan impact trigger end-of-Triassic mass extinction? Did the Manicouagan impact trigger end-of-Triassic mass extinction?

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992geo....20...51h&link_type=abstract

Geology, vol. 20, Issue 1, p.51

Physics

59

Scientific paper

We use U-Pb zircon dating to test whether the bolide impact that created the Manicouagan crater of Quebec also triggered mass extinction at the Triassic/Jurassic boundary. The age of the impact is provided by zircons from the impact melt rock on the crater floor; we show that the zircons yield a U-Pb age of 214 ±1 Ma. The age of the Triassic/Jurassic boundary is provided by zircons from the North Mountain Basalt of the Newark Supergroup of Nova Scotia; the zircons yield a U-Pb age of 202 ±1 Ma. This should be the age of the end-of-Triassic mass extinction that paleontology and sedimentation rates suggest occurred less than 1 m.y. before extrusion of the North Mountain Basalt. Although the Manicouagan impact could thus not have triggered the mass extinction at the Triassic/Jurassic boundary (impact likely having preceded extinction by 12 ±2 m.y.), the impact may possibly have triggered an earlier mass extinction at the Carnian/Norian boundary in the Late Triassic.

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