Recognizing hydrothermal alteration through a granulite facies metamorphic overprint at the challenger Au deposit, South Australia
The Challenger Gold Mine, South Australia, is hosted in granulite-facies migmatitic gneisses. Lack of hydrous alteration minerals, evidence for remobilization of Au-rich sulfide melts, and intense stretching of the ore package parallel to the regional gneissic fabric all point to a pre-metamorphic mineralization event. A combination of textural, mineralogical, and lithogeochemical criteria have been used to recognize the effects of partial melting during high-grade metamorphism and mass changes...[Show more]
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