The late Triassic Galore Creek alkalic porphyry district in north-western British Columbia contains five deposits and seven prospects that collectively represent the end-members of the silica-undersaturated alkalic porphyry systems. The district is located about 70km south-east of Juneau, Alaska and is dominantly underlain by volcanic and sedimentary rocks of the Middle to Upper Triassic Stuhini Group that compose part of the Stikine-Quesnell terrane. Of the five known deposits, the Central Zone is the largest and resembles the focus for ongoing studies. The Central Zone exhibits most of the typifying characteristics of classic alkalic porphyry deposits and provides an opportunity to enhance the understanding of these poorly understood but highly prospective deposit types.
In order to fully comprehend the hydrothermal genesis of Galore Creek’s Central Zone deposit, it is necessary to progressively examine and link deposit-scale geological features, such as the lithological and hydrothermal facies architecture, with results of in- depth geochemical analysis. The latter portion of the project will investigate (1) wholerock geochemical patterns, (2) sulphur isotopic distribution and (3) compositional and fluid inclusion analysis of hydrothermal garnets on a deposit-wide scale. The results of the study will be compared with research from other components of the “Alkalic Research Project” and literature from alkalic and calc-alkalic deposits.
My Ph.D. is part of a joint project between MDRU (Mineral Deposit Research Unit, UBC) and CODES (Centre for Ore Deposit Research, UTAS). It is sponsored in part by Geoscience BC, Novagold Resources Inc., NSERC as well as various other members of the industry.