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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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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorLeighton, C; Layton-Matthews, D; Peter, J MORCID logo; Gadd, M GORCID logo
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 125-137, https://doi.org/10.4095/313646 Open Access logo Open Access
Year2019
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative: 2018 report of activities
File formatpdf
ProvinceYukon
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; 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.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada's major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the research activities currently being conducted under the auspices of TGI.
GEOSCAN ID313646

 
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