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TitleCharacteristics of Ni-Cu-PGE sulphide mineralization within the 1.1 Ga Midcontinent Rift
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AuthorSmith, J; Bleeker, W; Liikane, D A; Hamilton, M; Cundari, R; Hollings, P
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 421-432, (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
NTS52A/03; 52A/04
AreaPardee Township; Crook Township
Lat/Long WENS -89.7000 -89.2333 48.1667 48.0000
Subjectseconomic geology; tectonics; geochemistry; mineral deposits; nickel; copper; sulphide deposits; base metals; precious metals; mineral exploration; ore mineral genesis; mineralization; ore controls; tectonic setting; rifts; magmatism; intrusions; sills; dykes; sulphur geochemistry; chromium geochemistry; silicates; bedrock geology; structural features; fault zones; faults; lithology; mafic rocks; ultramafic rocks; source rocks; xenoliths; Midcontinent Rift; Crystal Lake Intrusion; Logan Sills; Cloud River Dykes; Mount Mollie Intrusion; Pigeon River Dykes; Cloud River Dykes; Rove Formation; Duluth Complex; Eagle Deposit; Tamarack Deposit; Current Lake Deposit; Marathon Deposit; Coldwell Complex; Current Lake Intrusive Complex; Steepledge Intrusive Complex; Quetico Metasedimentary Belt; ore systems approach; platinum group elements; Precambrian; Proterozoic
Illustrationsgeoscientific sketch maps; cross-sections; stratigraphic columns; geochemical profiles; photographs
ProgramTargeted Geoscience Initiative (TGI-5), Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5), Nickel-copper-PGE-chromium ore systems - deposit controls in cratonic areas
Released2019 03 01
AbstractMagmatic Ni-Cu-PGE deposits of the ca. 1.1 Ga Midcontinent Rift system occur in association with a diverse range of ultramafic-mafic intrusions, from small early rift conduits to large, layered, mafic intrusions such as the Duluth Complex. The nature and style of mineralization is variable throughout these intrusions, some conduit deposits such as Eagle and Tamarack host massive nickel-copper sulphides, whilst others are relatively sulphur-poor but show extreme PGE enrichment (e.g. Current Lake; Marathon Deposit of the Coldwell Complex). The addition of external sulphur (Proterozoic and/or Archean) is considered critical in the formation of many of the Ni-Cu-PGE deposits; however, the key factors controlling the style of mineralization and the base and/or precious metal content are yet to be determined. This research aims to address the processes that are fundamental for metal enrichment and how these may vary both temporally and spatially during the rift's development. Furthermore, the Midcontinent Rift provides an excellent base to study the critical differences between mineralized and unmineralized intrusions, therefore providing the opportunity to assess key controls on metal endowment.