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Altered rhyolites that host the Archean Kidd Creek volcanogenic massive sulfide deposit have constant Hf-Th-Ta ratios throughout the entire deposit. Such constant ratios suggest that footwall and immediate hanging-wall rhyolites represent a single batch of high silica rhyolitic magma and that fractionation of accessory minerals was suppressed during crystallization.

Although extensive alteration has destroyed most primary minerals in the rhyolites and disturbed their geochemistry, high field strength elements such as Th, Ta, and Hf remained immobile during alteration and may be used to identify the protoliths and to determine the original trace element geochemistry of even the most altered...

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