contains 548 ppm of Cr, in contrast, altered dyke Gal-6 contains 259 ppm. This suggests the high Cr background of dykes in inherited from the original melt. Gal-10, representing the marginal granodiorite phase of the Sabaskong Batholith at Galbraith prospect contains up to 287 ppm of Cu, 118 ppm Pb and tungsten at 346ppm. This identifies a substantially different trace element signature than the marginal dykes. Chapter 8 Discussion – The Wagg and Galbraith gold prospects are plutonic in setting, occurring in the thermal aureole of the Sabaskong Batholith. Host rock mafic pillow basalts, at both prospects, are overprinted by amphibolite facies metamorphic conditions at 500-600°C and 0.2-1.2 GPa (Winter, 2011). Bulk rock geochemistry demonstrates high iron contents that range from 11 to 17% Fe2O3 and titanium levels of 0.7-1.4%. Inheritance of mineral chemistry from parent rock iron tholeiites explains the high presence of iron as shown in bulk rock data. Figure 15: Metamorphic facies diagram depicting temperature-pressure zones. Transitional zones are depicted as orange lines (Winter, 2001). Amphibolitic pillow lavas found at both prospects show conjugate jointing and local ductile shearing. Petrographic analysis along with electron microprobe data suggests that the hornblende-plagioclase assemblage underwent metasomatic calc-silicate bleaching at 500-600°C under high CO2 partial pressures (Winter, 2001) (Figure 15).
contains 548 ppm of Cr, in contrast, altered dyke Gal-6 contains 259 ppm. This suggests the high Cr background of dykes in inherited from the original melt. Gal-10, representing the marginal granodiorite phase of the Sabaskong Batholith at Galbraith prospect contains up to 287 ppm of Cu, 118 ppm Pb and tungsten at 346ppm. This identifies a substantially different trace element signature than the marginal dykes. Chapter 8 – Discussion The Wagg and Galbraith gold prospects are plutonic in setting, occurring in the thermal aureole of the Sabaskong Batholith. Host rock mafic pillow basalts, at both prospects, are overprinted by amphibolite facies metamorphic conditions at 500-600°C and 0.2-1.2 GPa (Winter, 2011). Bulk rock geochemistry demonstrates high iron contents that range from 11 to 17% Fe2O3 and titanium levels of 0.7-1.4%. Inheritance of mineral chemistry from parent rock iron tholeiites explains the high presence of iron as shown in bulk rock data. Figure 15: Metamorphic facies diagram depicting temperature-pressure zones. Transitional zones are depicted as orange lines (Winter, 2001). Amphibolitic pillow lavas found at both prospects show conjugate jointing and local ductile shearing. Petrographic analysis along with electron microprobe data suggests that the hornblende-plagioclase assemblage underwent metasomatic calc-silicate bleaching at 500-600°C under high CO2 partial pressures (Winter, 2001) (Figure 15).