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Along the northern margin of the 1.85Ga Sudbury Igneous Complex (SIC), Canada, a volumetrically minor rock type known as the footwall granophyre (FWGP) preserves evidence of the interaction of magmatic fluid and groundwater. The FWGP comprises veins, dikes and irregular bodies of a quartz–alkali feldspar–plagioclase intergrowth that are most abundant near footwall-style Cu–Ni–platinum-group element...