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Abstract

The Copper Mountain and Afton/Ajax alkalic porphyry copper-gold camps and Highland Valley calc-alkalic porphyry copper-moybdenum camp occur within Quesnellia, a northerly trending Mesozoic tectonostratigraphic terrane in central British Columbia. This terrane consists of a volcanic arc and overlying set of sedimentary packages that developed on a deformed oceanic sediment/volcanic complex (Harper Ranch and Okanagan subterranes) and was located somewhere offshore of North America during the early Mesozoic (Monger et al., 1992). The principal unit making up Quesnellia in southern British Columbia is the Late Triassic Nicola Group, a predominantly subaqueous island arc assemblage composed of volcanic and sedimentary rocks that have been intruded by early Jurassic alkalic, calc-alkalic and zoned mafic (Alaska-type) plutons and batholiths (Preto, 1977, 1979).

The Nicola Group occurs as a north-trending belt approximately 25 km wide approximately 7.5 km thick, extending from the U.S. border to north ofKamloops Lake (Schau, 1968; Preto, 1972; Preto, 1979; Mortimer, 1987). It is composed predominantly of augite-phyric andesites and intermediate-to-felsic pyroclastic rocks with subordinate amounts of greywacke, argillite and reefal limestone. The Nicola Group is broken into three blocks by two sub-parallel fault systems (the eastern one defined by the Boundary Fault, Princeton Graben, Summers Creek, Allison Lake and Quilchena Faults, Nicola Horst, Cherry Creek Fault and Kamloops Graben; the western one defined by the Coquihalla, Murray Lake, Fig Lake, Lornex, Guichon Creek and Deadman River Faults; Monger, 1989b; Monger and McMillan, 1989). The eastern fault system defines a zig-zag pattern of fault intersections and forms several 'rhombochasmic' horst and

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