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TitleOrganic geochemistry and petrology of sedimentary exhalative Pb-Zn and polymetallic hyper-enriched black shale deposits in the Selwyn Basin, Yukon
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorPeter, J MORCID logo; Gadd, M GORCID logo; Jiang, CORCID logo; Reyes, JORCID logo
SourceTargeted Geoscience Initiative 5: volcanic- and sediment-hosted massive-sulfide deposit genesis and exploration methods; by Peter, J MORCID logo (ed.); Gadd, M GORCID logo (ed.); Geological Survey of Canada, Bulletin 617, 2022 p. 89-112, Open Access logo Open Access
PublisherNatural Resources Canada
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative 5: volcanic- and sediment-hosted massive-sulfide deposit genesis and exploration methods
File formatpdf
NTS105I; 105J; 105O; 105P; 106C; 106D; 106E; 106F; 106K; 106L; 106M; 106N; 116A; 116H; 116I
AreaYukon River; Peel River; Porcupine River
Lat/Long WENS-138.0000 -128.0000 67.0000 62.0000
Lat/Long WENS-126.0000 -124.0000 58.0000 56.0000
Subjectseconomic geology; geochemistry; sedimentology; Science and Technology; Nature and Environment; Middle Devonian; mineral exploration; exploration guidelines; mineral deposits; sedimentary ore deposits; polymetallic ores; hydrothermal deposits; metals; lead; zinc; ore mineral genesis; mineralization; ore controls; organic geochemistry; sedimentary petrology; pyrolysis; petrographic analyses; solvent extraction; gas chromatography; mass spectrometer analysis; thermal analyses; thermal maturation; organic carbon; carbon geochemistry; pyrobitumen; reflectance; microorganisms; continental margins; sedimentary basins; host rocks; bedrock geology; lithology; sedimentary rocks; shales; tectonic history; Canadian Cordillera; Selwyn Basin; Richardson Trough; Nick Property; Peel River Deposit; Howard's Pass District; XY Central Deposit; Canol Formation; Road River Group; Duo Lake Formation; Phanerozoic; Paleozoic; Devonian; Silurian
Illustrationslocation maps; geoscientific sketch maps; stratigraphic sections; lithologic sections; tables; spectra
ProgramTargeted Geoscience Initiative (TGI-5) Volcanic and sedimentary systems - volcanogenic massive sulphide ore systems
Released2022 01 27; 2022 11 17
AbstractPaleozoic strata of the Selwyn Basin host sedimentary exhalative (SEDEX) Pb-Zn deposits, and age-correlative strata of the Richardson trough host polymetallic hyper-enriched black shale (HEBS) deposits. In both deposit types, organic matter is spatially and temporally associated with mineralization. We investigated the characteristics of organic matter in mineralization and unmineralized host rocks in the XY Central SEDEX deposit in the Howard's Pass district, and the Nick and Peel River HEBS deposits in the Richardson trough using Rock-Eval pyrolysis, organic petrography, and solvent extraction and gas chromatography mass spectrometry (GCMS) analysis of the soluble organic matter (SOM). All samples experienced extremely high thermal maturity (Tmax up to 599°C), indicating they contain low SOM. Rock-Eval parameters S1, S2, HI, and OI values are low. Total organic carbon (TOC) values are low for Nick and Peel River and are generally higher for XY Central. Residual carbon values are universally high. Mineral carbon values are low for deposits studied (one outlier). Pyrobitumen reflectance is mostly below 5.80%. Full-scan GCMS analyses of SOM reveal that most, if not all, high molecular weight hydrocarbons, including biomarkers, have been lost due to thermal cracking and many detected peaks are likely due to contaminants introduced during sampling.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) 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. This contribution summarizes the results of a 5-year study of multiple mineral deposit types: polymetallic hyper-enriched black shale; sedimentary exhalative Pb-Zn; carbonate-hosted Pb-Zn, magnesite; fracture-controlled replacement Zn-Pb, rare-earth element-F-Ba; and volcanogenic massive sulfides. Studies employed field geology, combined with geochemical (lithogeochemistry, stable and radiogenic isotopes, fluid inclusions, and mineral chemistry) and geophysical (rock properties, magnetotelluric, and seismic) methods. Collectively, the research provides advanced genetic and exploration models for volcanic- and sedimentary-hosted base-metal deposits, together with new laboratory, geophysical, and field techniques.

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