Abstract

Mistastin Lake, Labrador, latitude 55°53′ N, longitude 63°18′ W, is a roughly circular lake with a large central island lying in a marked depression. A meteorite impact origin is indicated by shock metamorphism features and fracturing of anorthosite and adamellite on the central island and of inclusions in flat-lying igneous rocks on the western shore. The crater had an original diameter of about 20 km and an age, by whole-rock K–Ar determination, of 202 ± 25 m.y.

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