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TitlePreliminary fluid-inclusion microthermometry study of fluid evolution and temperature-pressure conditions in the Goldcorp High-Grade zone, Red Lake mine, Ontario
AuthorChi, G; Dubé, B; Williamson, K
SourceGeological Survey of Canada, Current Research (Online) no. 2002-C27, 2002, 12 pages, (Open Access)
PublisherNatural Resources Canada
Mediapaper; on-line; digital
RelatedThis publication is contained in Geological Survey of Canada; (2002). Current Research 2002, winter release, Geological Survey of Canada, Current Research no. 2002
File formatpdf (Adobe Acrobat Reader)
AreaRed Lake; Balmertown
Lat/Long WENS-94.0000 -93.5000 51.2500 51.0000
Subjectseconomic geology; igneous and metamorphic petrology; gold; mineralization; mineral potential; fluid inclusions; veins; vein deposits; carbonate zones; pressure-temperature conditions; petrography; silicification; immiscibility, liquid; Campbell Fault Zone; microthermometry
Illustrationssketch maps; photographs; diagrams; graphs
Released2002 02 15
AbstractFluid-inclusion microthermometry was done on a barren carbonate vein and a gold-rich silicified carbonate vein. Fluid immiscibility is indicated by the coexistence of carbonic and aqueous inclusions in both carbonate and auriferous quartz. Primary fluid inclusions in the carbonate indicate CO 2 dominance in the carbonic phase, homogenization temperatures of aqueous inclusions range from 191.8E to 343.9EC, and fluid pressures from 129 to 1448 bars. Primary fluid inclusions in auriferous quartz indicate significant amounts of CH 4 in addition to CO 2 in the carbonic phase, homogenization temperatures of aqueous inclusions range from 252.1E to 380.1E, and fluid pressures from 882 to 2436 bars. The study documents a systematic change in fluid composition and inferred temperature-pressure conditions from carbonate-vein formation, through auriferous silicification, to post main-stage mineralization, euhedral quartz, and gold remobilization. The carbonate veins and silicification formed at similar temperatures, but at significantly different fluid pressures, which may indicate a) a difference in formation depths, b) a change of fluid regime from hydrostatic to lithostatic, or c) post-trapping modification of fluid inclusions.