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TitleApplication of pyrite chemistry to recognize a distal expression of hydrothermal activity in the MacMillan Pass SEDEX district, Yukon
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AuthorLeighton, C; Layton-Matthews, D; Peter, J M; Gadd, M G
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 125-137, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2019). Targeted Geoscience Initiative: 2018 report of activities, Geological Survey of Canada, Open File 8549
File formatpdf
NTS105I; 105J
AreaMacMillan Pass
Lat/Long WENS-132.0000 -128.0000 63.0000 62.0000
Subjectseconomic geology; geochemistry; mineral deposits; lead; zinc; silver; barium; sedimentary ore deposits; volcanic exhalitive zone; volcano-sedimentary ore deposits; mineral exploration; ore mineral genesis; mineralization; ore controls; pyrite; geochemical analyses; trace element analyses; mass spectrometer analysis; depositional environment; fluid dynamics; drillholes; mineral associations; morphology; sedimentary environment; diagenesis; hydrothermal systems; metamorphism; mineral enrichment; mineral occurrences; barite; bedrock geology; lithology; sedimentary rocks; argillites; conglomerates; mudstones; sandstones; breccias; igneous rocks; intrusive rocks; felsic intrusive rocks; monzonites; sulphide deposits; structural features; folds; anticlines; paragenesis; microscopic analysis; tectonic history; Tom Deposit; Jason Deposit; Selwyn Basin; ore systems approach; sedimentary exhalative (SEDEX) deposits; geochemical signatures; Phanerozoic; Paleozoic; Carboniferous; Mississippian; Devonian
Illustrationsgeoscientific sketch maps; lithologic sections; correlation sections; geochemical profiles; tables; photomicrographs; geochronological charts; schematic representations; geochemical plots
ProgramTargeted Geoscience Initiative (TGI-5), Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5), Volcanogenic massive sulphide ore systems - deposition - time and space
Released2019 03 01
AbstractThe Tom and Jason sedimentary exhalative (SEDEX) Pb-Zn-Ag-(Ba) deposits in Yukon grade 7.4 weight % and 7.0 weight % Zn, and 6.5 weight % and 4.6 weight % Pb, with zinc and lead tonnages of 15.7 and 10.1 Mt, respectively. Pyrite is ubiquitous in SEDEX deposits and can potentially reveal much information about the environment and nature of deposition, hydrothermal fluid properties, genesis of mineralization, and may provide vectors toward mineralization. Pyrite-bearing samples from three drillholes situated 2 to 4 km from mineralization (but time-stratigraphically equivalent) were sampled, and four generations of pyrite were identified (Py1, Py2, Py3, Py4), each with distinct morphological characteristics and mineralogical associations. Synsedimentary (Py1), diagenetic (Py2), hydrothermal (Py3) and metamorphic (Py4) morphologies were identified. A representative subset of pyrite grains was analyzed for trace element contents by laser ablation-inductively coupled plasma mass spectrometry using raster grids to create quantitative trace element composition maps, in order to characterize the trace element composition of each pyrite generation.
A distal (2-4 km) expression of hydrothermal mineralization is recognized in Py3, which displays mineral associations and a trace element assemblage typical of hydrothermally precipitated pyrite. The trace element geochemistry of pyrite distal to SEDEX mineralization (and time-stratigraphically equivalent to it) displays enrichment in Zn, Mn, As and Co, and these elements are generally more abundant in Py3 than other generations, indicating the presence of nearby concealed mineralization.