The Ordovician meteorite event in North America: Age of the Slate Islands impact structure, northern Lake Superior, Ontario, Canada

Author:

Parisi Andrew F.1,Catlos Elizabeth J.1ORCID,Brookfield Michael E.1ORCID,Schmitt Axel K.23ORCID,Stöckli Daniel F.1ORCID,Miggins Daniel P.4ORCID,Campos Daniel S.1

Affiliation:

1. Jackson School of Geosciences University of Texas at Austin, Center for Planetary Systems Habitability Austin Texas USA

2. Institut für Geowissenschaften, Ruprecht‐Karls‐Universität Heidelberg Heidelberg Germany

3. John de Laeter Centre, Curtin University Bentley Western Australia Australia

4. Oregon State University, Oregon State University Argon Geochronology Laboratory Corvallis Oregon USA

Abstract

AbstractThe Slate Islands (Ontario) is one of Canada's larger impact structures at 32 km in diameter and has been linked to the Ordovician meteorite event (OME). We report zircon U–Pb dates from two suevite and two syenite samples collected from the Slate Islands. Plagioclase 40Ar/39Ar dates were also obtained from one of the samples. The plagioclase and most zircon dates record pre‐impact ages with links to known tectonic events, including those associated with the assembly of the Superior Craton at approximately 2700 Ma. However, Neoarchean zircon grains appear to be reset at 456.1 ± 6.9 Ma (±2σ) based on the lower intercept of discordia for all dated samples. The date overlaps its previously accepted age of 450 Ma and would be 2–19 million years following the parent asteroid breakup if related to the OME.

Publisher

Wiley

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Evidence suggesting that earth had a ring in the Ordovician;Earth and Planetary Science Letters;2024-11

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