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In this chapter we report on the use and limitations of oxygen and halogen fugacities to characterize granitoids associated with tungsten deposits. Tungsten-related granitoids generally occupy an intermediate geochemical position, less evolved than tin granites, but more differentiated than porphyry copper and molybdenum granodiorites.

Microprobe analyses of the different populations of biotite in the CanTung system (in granite, aplite, lamprophyre, vein, and skarn) show differences in major-element chemistry. Fluorine-chlorine intercept values, however, indicate that the halogens in the biotites reequilibrated with one fluid. This reequilibration probably was at relatively low temperatures (300° to 350°C), but might have been at higher...

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