Immobile element relationships for altered volcanic rocks at the Phelps Dodge deposit, Matagami. The samples lie essentially along a single alteration line corresponding to variably altered rhyolite. Samples which experienced mass loss due to leaching by hot fluids have apparently higher (residually concentrated) Al2O3 and Zr contents relative to the precursor rhyodacite. By contrast, samples which experienced mass gain due to precipitation from cooler fluids have apparently lower (diluted) Al2O3 and Zr contents. These relations are used as the basis for the mass change calculations shown in Photo 9.

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