Aeromagnetic Studies of Eastern Lake Superior

Hinze, William J.; O'Hara, Norbert W.; Trow, James W.; Secor, George B.

doi:10.1029/gm010p0095

Cited by 12 publications

(1 citation statement)

References 15 publications

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“…However, in other maps, this system appears south of the island (Lukošius‐Sanders, 1988; Manson & Halls, 1991). These fault systems are considered post‐Keweenawan and are generally only seen in aeromagnetic surveys (Hinze et al., 1996; Manson & Halls, 1994).…”

Section: Geological Backgroundmentioning

confidence: 99%

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

Parisi,

Catlos,

Brookfield

et al. 2024

Meteorit & Planetary Scien

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The 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.

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Section: Geological Backgroundmentioning

confidence: 99%