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TitleMacmillan Pass, Yukon SEDEX mineralisation: the geochemical characterization of a vent complex
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorMagnall, J M; Gleeson, S A; Paradis, S; Blamey, N J F
SourceGeological Survey of Canada, Scientific Presentation 58, 2017, 1 sheet, Open Access logo Open Access
PublisherNatural Resources Canada
Mediaon-line; digital
File formatpdf
ProvinceYukon; British Columbia
NTS95A; 95B; 95C; 95D; 95E; 95F; 95G; 95H; 95I; 95J; 105F; 105G; 105H; 105I; 105J; 105K
AreaCanadian Cordillera; Macmillan Pass
Lat/Long WENS-133.0000 -128.0000 63.0000 61.0000
Subjectseconomic geology; geochemistry; igneous and metamorphic petrology; mineral deposits; sedimentary ore deposits; stratiform deposits; volcanic exhalitive zone; zinc; lead; ore mineral genesis; mineralization; volcanic vents; magmatism; hydrothermal systems; fluid flow; alteration; stockworks; veins; sulphides; diagenesis; bedrock geology; lithology; sedimentary rocks; mudstones; sandstones; conglomerates; drill core analyses; geochemical analyses; electron probe analyses; stable isotope studies; carbon isotopes; oxygen isotopes; fluid inclusions; gas analyses; mass spectrometer analysis; major element analyses; trace element analyses; whole rock analyses; geochemical anomalies; europium; cerium; petrography; Selwyn Basin; Earn Group; Portrait Lake Formation; Tom Deposit; Nidd Deposit; Phanerozoic; Paleozoic; Devonian
Illustrationssketch maps; stratigraphic charts; photographs; charts; geochemical plots; schematic representations; photomicrographs
ProgramTargeted Geoscience Initiative (TGI-5) Volcanic and sedimentary systems
Released2017 05 04
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI-4) is a collaborative federal geoscience program that provides industry with the next generation of geoscience knowledge and innovative techniques to better detect buried mineral deposits, thereby reducing some of the risks of exploration. Samples from vent complexes of the Tom and Nidd sedimentary exhalative (SEDEX) deposits (Selwyn Basin) are documented. Stable isotope analyses (C and O) of mineral separates and bulk geochemistry indicate the influence of both deep and shallow processes on the chemistry of the hydrothermal fluid. Evidence for the breakdown of organic matter is preserved in highly negative and positive d13C values. Rare earth element profiles (REE) display positive Eu anomalies and negative Ce anomalies, indicating the mixing of a deep, hot, reducing fluid with an oxidizing fluid (seawater). Discounting Pb, Zn and Ba (ore components), vent samples have enrichments above upper crustal values for Au, Ag, As, Cd, Cu, Ge, In, Mo, Sb, Sn and Ta. Notably, Au enrichments in two samples from Tom are in excess of 100ppb Au.

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