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TitleArchitecture of magmatic conduits in chromium-PGE and Ni-Cu-PGE ore systems in Superior Province: example from the 'Ring of Fire' region, Ontario
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AuthorHoulé, M G; Lesher, C M; Metsaranta, R T; Sappin, A -A
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 441-448, (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
NTS43C/12; 43C/13; 43C/14; 43D/09; 43D/10; 43D/11; 43D/14; 43D/15; 43D/16
AreaRing of Fire
Lat/Long WENS -87.2294 -85.3836 52.9694 52.5814
Subjectseconomic geology; stratigraphy; tectonics; mineral deposits; polymetallic ores; modelling; mineral exploration; metals; chromium; nickel; copper; ore mineral genesis; mineralization; ore controls; tectonic history; magmatism; intrusions; fluid flow; flow regimes; bedrock geology; lithology; mafic rocks; ultramafic rocks; stratigraphic analyses; Archean; Superior Province; McFaulds Lake Greenstone Belt; Ring of Fire Intrusive Suite; Koper Lake Subsuite; Ekwan River Subsuite; Black Thor Intrusion; Double Eagle Intrusion; Esker Intrusive Complex; Eagle's Nest Dyke; ore systems approach; platinum group elements (PGEs); 3-D modelling; Precambrian
Illustrationslocation maps; geoscientific sketch maps; photographs; tables; schematic representations
ProgramTargeted Geoscience Initiative (TGI-5), Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5), Nickel-copper-PGE-chromium ore systems - architecture - Cr-bearing systems
Released2019 03 01
AbstractOne of the most prominent features of the McFaulds Lake greenstone belt (also known as the 'Ring of Fire'; RoF) in northern Ontario is an abundance of 2.7 to 2.8 Ga mafic to ultramafic intrusive rocks that host world-class magmatic chromium, significant magmatic Ni-Cu-PGE and potentially economically significant Fe-Ti-V mineralization. The Neoarchean intrusions in the RoF have been referred to as the Ring of Fire intrusive suite, which is here subdivided into two main magmatic subsuites: the spatially restricted ultramafic-dominated Koper Lake subsuite and the more widespread mafic-dominated Ekwan River subsuite. The Koper Lake subsuite includes the Esker intrusive complex, which comprises the Black Thor and Double Eagle intrusions that host the Black Thor, Black Label, Big Daddy, Black Creek, Black Horse and Blackbird chromite deposits and several Ni-Cu-PGE showings, the Blue Jay funnel, which hosts the Blue Jay Ni-Cu-PGE prospect, and the Eagle's Nest dyke, which hosts the Eagle's Nest Ni-Cu-PGE deposit. The Black Thor and Double Eagle intrusions are interpreted to have initially intruded separately, but to have coalesced over time with magma inflation within a dynamic komatiitic system to form the chromium and Ni-Cu-PGE-bearing Esker intrusive complex, one of the most important members of an increasingly important class of polymetallic magmatic ore systems.