Evaluating the magmatic history, magmatic source fertility, and metal contributions to goldbearing hydrothermal systems, Mooshla Intrusive Complex, Doyon-Bousquet-LaRonde mining camp, Abitibi Greenstone Belt, Quebec

Abstract

The Mooshla Intrusive Complex is an Archean polyphase tonalite-trondhjemite-quartz diorite-gabbroic magmatic body located in the Doyon-Bousquet-LaRonde mining camp of the Abitibi greenstone belt, Québec, Canada. The complex is spatially and temporally associated with numerous gold-rich volcanogenic massive sulfide, epizonal intrusion-related Au ± Cu, and shear zone-hosted orogenic gold and/or remobilized volcanogenic massive sulfide deposits. The intrusive complex has been characterized by numerous methods including high-precision U-Pb geochronology, accessory mineral trace element composition (i.e., zircon, titanite, anhydrite, quartz), silicate melt inclusions, and isotopic analyses. This provides a comprehensive study on the melt and pressure-temperature-time evolution of the magmatic system and potential influence the system had in supplying metals to the gold deposits. Additionally, two gold deposits hosted in the Mooshla Intrusive Complex have been studied to document the ore mineralogy and trace element and isotopic characteristics that aid in identifying a magmatic fluid source for these systems.