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TitleMineral markers of porphyry copper mineralization: work in progress at the Gibraltar deposit, British Columbia
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AuthorPlouffe, A; Kobylinski, C H; Hattori, K; Wolfe, L; Ferbey, T
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; by Rogers, N (ed.); Geological Survey of Canada, Open File 8358, 2018 p. 57-67, https://doi.org/10.4095/306423
Year2018
PublisherNatural Resources Canada
Documentopen file
Lang.English
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
ProvinceBritish Columbia
NTS93B/07; 93B/08; 93B/09; 93B/10
AreaFraser River
Lat/Long WENS-122.5833 -122.0833 52.6667 52.4167
Subjectseconomic geology; surficial geology/geomorphology; tectonics; geochemistry; mineral deposits; mineral exploration; mineral potential; porphyry deposits; copper; molybdenum; ore mineral genesis; mineralization; ore controls; bedrock geology; lithology; igneous rocks; intrusive rocks; diorites; tonalites; trondhjemites; volcanic rocks; mafic volcanic rocks; basalts; volcano-sedimentary strata; sedimentary rocks; conglomerates; clasts; metamorphic rocks; schists; tectonic history; intrusions; oxidation; thermal history; crystallization; foliation; structural features; faults; glacial deposits; tills; rutile; epidote; zircon; cerium; neodymium; antimony; till analyses; heavy mineral samples; mineral occurrences; mass spectrometer analysis; electron probe analyses; electron microscope analyses; Gibraltar Deposit; Granite Mountain Batholith; Chilcotin Group; Gibraltar Mine; Nicola Group; Endako Group; Quesnel Terrane; Ashcroft Formation; Cache Creek Terrane; Cache Creek Complex; Burgess Creek stock; Sheridan stock; ore systems approach; indicator minerals; rare earth element analyses; thermometry analyses; Phanerozoic; Cenozoic; Tertiary; Mesozoic; Cretaceous; Jurassic; Triassic; Paleozoic; Permian; Carboniferous
Illustrationslocation maps; geoscientific sketch maps; plots; graphs
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Location
 
Natural Resources Canada Library - Ottawa (Earth Sciences)
 
ProgramKnowledge Management Coordination, Targeted Geoscience Initiative (TGI-5)
ProgramPorphyry systems, Targeted Geoscience Initiative (TGI-5)
Released2018 01 19
AbstractIndicator minerals that can persist within glacial sediments offer the potential to be tracers towards buried porphyry mineralization. This study is examining the composition of epidote, rutile and zircon in till and bedrock from the Gibraltar copper-molybdenum porphyry deposit, British Columbia, to test their utility as indicators of mineralizing system fertility. Some rutile grains in till at Gibraltar have a composition comparable to rutile from the El Teniente porphyry copper deposit in Chile. Comparison of the composition of rutile in till and bedrock at Gibraltar is in progress. Other studies have indicated that high Ce/Ce* values in magmatic zircon are indicative of oxidizing conditions that are favourable for the formation of porphyry deposits. At Gibraltar, zircon from the mineralized phase of the intrusion yields high Ce/Ce* values (average of 133) relative to the barren intrusive phases. Epidote is more abundant in till in the region of the host intrusion. Such distribution was originally interpreted to be derived from the propylitic alteration related to porphyry mineralization. Detailed analysis of the epidote shows that epidote in till could be derived from the contact zone between the Granite Mountain batholith and the Nicola volcanic rocks.
GEOSCAN ID306423