The occurrence of quench-crystal basalts from the Proterozoic Knob Lake and Doublet Groups of the Labrador Geosyncline is reported. The microscopic textures are similar to those in both modern abyssal basalts and Archean basalts from the Superior Province of the Canadian Shield. Textures of quench plagioclase and pyroxene have been well preserved but the plagioclase has been altered.

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