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TitleMineral markers of porphyry copper mineralization: progress report on the evaluation of tourmaline as an indicator mineral
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AuthorMcClenaghan, M B; Beckett-Brown, C E; McCurdy, M W; McDonald, A M; Leybourne, M I; Chapman, J B; Plouffe, A; Ferbey, T
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; by Rogers, N (ed.); Geological Survey of Canada, Open File 8358, 2018 p. 69-77, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2018). Targeted Geoscience Initiative: 2017 report of activities, volume 1, Geological Survey of Canada, Open File 8358
File formatpdf
NTS115J/09; 115J/10; 115J/11; 115J/14; 115J/15; 115J/16
AreaCanadian Cordillera; Yukon River
Lat/Long WENS-139.1667 -138.1667 62.9167 62.5000
Subjectseconomic geology; surficial geology/geomorphology; geochemistry; mineral deposits; mineral exploration; exploration methods; drift prospecting; ore mineral genesis; ore controls; mineralization; porphyry deposits; copper; tourmaline; hydrothermal systems; bedrock geology; lithology; glacial deposits; tills; till samples; stream water geochemistry; stream sediment samples; sands; silts; geochemical analyses; heavy minerals; heavy mineral analyses; crystallography; minor element geochemistry; major element geochemistry; trace element geochemistry; grain size analyses; bulk samples; paragenesis; textural analyses; diffusion; Intermontane Belt; Yukon-Tanana Terrane; Casino Deposit; Woodjam Deposit; ore systems approach; indicator minerals; bedrock samples; Phanerozoic; Mesozoic; Cretaceous; Jurassic; Triassic; Paleozoic; Permian; Carboniferous; Devonian
Illustrationsphotomicrographs; geoscientific sketch maps; location maps; tables; photographs
ProgramTargeted Geoscience Initiative (TGI-5), Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5), Porphyry systems
Released2018 01 19
AbstractTourmaline is considered a potential indicator of porphyry-style mineralization as it is a relatively common accessory mineral and has a broad range of compositions. The aim of this study is to test discrimination criteria for tourmaline in relation to porphyry copper mineralization. Work to date has focussed on the collection of tourmaline in bedrock samples from a broad range of known porphyry deposits, the detailed examination of tourmaline in archived till samples from the vicinity of the Woodjam deposit, and the collection of new bedrock and stream sediment samples in the area of the Casino deposit. Three different types of tourmaline were identified in bedrock from Casino: i) breccia-style; ii) vein-style; and iii) disseminated. A paragenetic analysis based on associated minerals and tourmaline textures indicates that tourmaline is one of the first hydrothermal minerals to form in the mineralized porphyry system. Diffusion-like textures found in some tourmaline grains from bedrock samples from other deposits is significant because chemical diffusion in tourmaline is considered to be virtually non-existent. Future work includes the completion of trace element analysis of tourmaline, comparison of tourmaline chemical signatures in bedrock to those recovered in till or stream sediments at the two test sites, and investigation of Fe2+/Fe3+ using Raman spectroscopy.