| Title | Organic geochemistry and petrology of sedimentary exhalative Pb-Zn and polymetallic hyper-enriched black shale deposits in the Selwyn Basin, Yukon |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Peter, J M ; Gadd,
M G; Jiang, C; Reyes, J |
| Source | Targeted Geoscience Initiative 5: volcanic- and sediment-hosted massive-sulfide deposit genesis and exploration methods; by Peter, J M (ed.); Gadd, M G (ed.); Geological Survey of Canada, Bulletin 617, 2022 p. 89-112, https://doi.org/10.4095/328017  Open Access |
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| Year | 2022 |
| Publisher | Natural Resources Canada |
| Document | serial |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in Targeted Geoscience
Initiative 5: volcanic- and sediment-hosted massive-sulfide deposit genesis and exploration methods |
| File format | pdf |
| Province | Yukon |
| NTS | 105I; 105J; 105O; 105P; 106C; 106D; 106E; 106F; 106K; 106L; 106M; 106N; 116A; 116H; 116I |
| Area | Yukon 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 |
| Subjects | economic 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 |
| Illustrations | location maps; geoscientific sketch maps; stratigraphic sections; lithologic sections; tables; spectra |
| Program | Targeted Geoscience Initiative (TGI-5) Volcanic and sedimentary systems - volcanogenic massive sulphide ore systems |
| Released | 2022 01 27; 2022 11 17 |
| Abstract | Paleozoic 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. |
| GEOSCAN ID | 328017 |
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