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TitleDiscovering the next generation of copper porphyry deposits using mineral markers
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AuthorPlouffe, A; Kjarsgaard, I M; Kobylinski, C H; Hattori, K; Petts, D C; Venance, K E; Ferbey, T
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 321-331, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2019). Targeted Geoscience Initiative: 2018 report of activities, Geological Survey of Canada, Open File 8549
File formatpdf
ProvinceBritish Columbia
NTS92I; 92P; 93A; 93B
AreaFraser River; Cache Creek; Kamloops; Merritt; Likely; Williams Lake
Lat/Long WENS-124.0000 -120.0000 53.0000 50.0000
Subjectseconomic geology; surficial geology/geomorphology; geochemistry; mineralogy; tectonics; mineral deposits; mineral exploration; exploration methods; mineral potential; porphyry deposits; copper; molybdenum; gold; silver; ore mineral genesis; mineralization; epidote; zircon; glacial deposits; tills; till analyses; glacial features; ice flow; isotopic studies; isotope ratios; cerium; neodymium; europium; antimony geochemistry; arsenic geochemistry; tectonic setting; intrusions; batholiths; metamorphism; hydrothermal systems; alteration; bedrock geology; lithology; igneous rocks; intrusive rocks; granodiorites; monzo-granites; diorites; monzonites; tonalites; volcanic rocks; host rocks; mass spectrometer analysis; trace element analyses; scanning electron microscope analyses; electron probe analyses; Neogene; Canadian Cordillera; Gibraltar Deposit; Granite Mountain Batholith; Gibraltar Mine; Mount Polley Deposit; Woodjam Deposit; Highland Valley Deposit; Chilcotin Group; Nicola Group; Takomkane Batholith; Thuya Batholith; Guichon Creek Batholith; Sheridan Creek Stock; ore systems approach; porphyry copper indicator minerals (PCIM); ice-flow directions; rare earth element analyses; Phanerozoic; Cenozoic; Tertiary; Mesozoic; Jurassic; Triassic
Illustrationslocation maps; geoscientific sketch maps; plots; graphs; photomicrographs
ProgramTargeted Geoscience Initiative (TGI-5), Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5), Intrusion/Porphyry ore systems - porphyry processes - mineral markers
Released2019 03 01
AbstractThe composition of epidote and zircon in till and bedrock around copper porphyry mineralization in south-central British Columbia are investigated as an indicator towards deposits covered by glacial sediments. At the Gibraltar porphyry deposit, new dating reveals that the Mine phase of the Granite Mountain batholith was emplaced during three intrusive pulses at ca. 205, 213 and 219 Ma. Zircon Ce4+/Ce3+ ratios, a potential fertility proxy, progressively decrease from an average of 681 in the earliest mineralized intrusive Mine phase (219 Ma) to 193 in the younger intrusive phase (202-207 Ma). Zircon with Ce4+/Ce3+ values greater than 400, corresponding to a Ce/Nd ratio of 20, are most likely derived from the mineralized Mine phase. Two zircon grains with Ce/Nd ratios greater than 20 were identified in a till sample less than 1 km down-ice from mineralization. Epidote grains in till from three porphyry localities (Mount Polley, Woodjam, and Gibraltar) and bedrock from Woodjam were analyzed to test the hypothesis that a simple correlation plot of Sb versus As could be used to differentiate epidote that formed in metamorphic versus hydrothermal settings. Our preliminary results show a significant overlap between the As and Sb concentrations in epidote grains from till and epidote from the alteration zones at the Woodjam prospect. Future work will investigate whether epidote in till with low As (< 10 ppm) and Sb (<1 ppm) levels could be derived from regionally metamorphosed rocks of the Nicola Group.