Figure 7. Calculated mass changes () for K2O and Na2O superimposed on chemically defined volcanic units in DDH 10-2025. The unusual zone of sodic alteration in the upper footwall is also depleted in K2O, implying formation of albite at the expense of orthoclase. Hangingwall rhyolite A is strongly depleted in Na2O for at least 100 m above the massive sulfide lens.

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