Seismic reflection imaging over a massive sulfide deposit at the Matagami mining camp, Québec

摘要: A 2-D seismic reflection profile was shot across the southern flank of Matagami mining camp, almost directly above recently discovered Bell Allard massive sulfide deposit, now estimated at more than 6 million metric tons. All orebodies found in part including Allard, are located contact between primarily basaltic Wabassee Group and underlying rhyolitic Watson Lake Group. Seismic reflections were recorded from basalt-rhyolite contacts lower Group, as well gabbro sills that intrude much volcanic stratigraphy. strong top orebody also detected, but does not extend over full width deposit defined by drilling, appearing to correlate with pyrite-rich zone. Faulting, which can be interpreted discontinuities observed reflections, probably controlled formation deposit. If accepted isotime markers, then faulting deeper sill complex defines a series half grabens within The is intersection one these apparently low-angle normal faults indicating mineralization may have been associated fluid flow along fault, likely penetrates mafic intrusion. Although precise geometry subsurface cannot single profile, results indicate 3-D survey should allow mapping many fault systems verification hypotheses fault-controlled formation.