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| Wabigoon Subprovince | |
|---|---|
| Name | Wabigoon Subprovince |
| Settlement type | Geologic terrane |
| Subdivision type | Country |
| Subdivision name | Canada |
| Subdivision type1 | Province |
| Subdivision name1 | Ontario |
Wabigoon Subprovince The Wabigoon Subprovince is a Precambrian geologic terrane in northwestern Ontario associated with the Superior Province of the Canadian Shield, notable for Paleoproterozoic greenstone belts and Archean granitoid complexes. It underlies parts of the Dryden and Kenora District regions and is spatially associated with the Wabigoon Fault Zone and mineralized belts that have drawn interest from provincial agencies and mining companies. The terrane has been the subject of regional studies by organizations such as the Geological Survey of Canada and the Ontario Geological Survey.
The subprovince is situated within the Superior Province adjacent to the English River Belt, the Winnipeg River Subprovince, and the Uchi Subprovince, and it forms part of the Archean cratonic nucleus that underpins much of Canada. Rock assemblages include mafic-ultramafic flows, felsic volcanics, and synvolcanic to late-tectonic intrusive suites that are comparable to assemblages in the Abitibi greenstone belt, the Wawa Subprovince, and the Volcanic belts of the Canadian Shield. Regional boundaries coincide with major tectonic breaks such as the Rainy Lake–Seine River fault and are contiguous with terranes studied in the context of the Trans-Hudson Orogen and the Kenoran Orogeny.
Stratigraphic sections comprise Archean metavolcanic and metasedimentary successions including pillowed basalt, komatiite, rhyolite, and volcaniclastic units similar to those seen in the Pimainus Lake Group and the Crow Lake assemblage, overlain locally by iron formation, chert, and quartzite comparable to the Temagami iron formation and the Serpent River Formation. Intrusive lithologies range from tonalite and granodiorite to granite and syenite consistent with plutons documented in studies of the Battle River Suite and the Red Lake greenstone belt. Mafic sills and dikes with tholeiitic affinities are correlated with regional magmatic events that produced suites analyzed in the Abitibi Subprovince and the Swayze greenstone belt.
Structural architecture reflects Archean to Paleoproterozoic deformation including tight folding, high-strain shear zones, and transcurrent fault systems akin to the Snowbird Tectonic Zone and the Seine River Fault Zone. Major faults and lineaments control terrane juxtaposition and hosted lithological truncation comparable to relationships documented along the Manitouwadge fault and the Pickle Lake Fault. Deformation events produced regional metamorphic gradients and mylonitic belts analogous to those mapped in the Michipicoten greenstone belt and the Hudson Bay Fold Belt, with northwest-trending folds and northeast-trending shear fabrics that record the accretionary processes similar to models for the Superior Province assembly.
The subprovince hosts volcanogenic massive sulfide (VMS), orogenic gold, and iron oxide–apatite mineralization with analogues in the Timmins mining camp, the Red Lake Mine, and the Noranda District. VMS-style massive sulfide occurrences show stratiform copper-zinc-lead ± silver ± gold mineralization comparable to deposits in the Bathurst Mining Camp and the Flin Flon District, whereas gold-quartz veins and shear-hosted lodes are similar to styles exploited at Goliath Gold Mine and Yellowknife gold occurrences. Iron formations and banded ironstone units have been investigated for magnetite and hematite potential analogous to projects in the Michipicoten iron range and the Algoma-type iron formations. Economic interests have attracted exploration by companies with claims registered with the Ontario Ministry of Mines and reporting to stock exchanges such as the TSX Venture Exchange.
U–Pb zircon ages from felsic volcanic and intrusive units yield Archean ages comparable to those reported from the Abitibi greenstone belt and the Pikwitonei Domain, while metamorphic overprints record Paleoproterozoic isotopic resets linked to events like the Trans-Hudson Orogeny and preservation patterns studied in the context of the Kenoran Orogeny. Geochronologic constraints using SHRIMP and LA-ICP-MS techniques have produced age spectra comparable to those published for the Red Lake greenstone belt and the Uchi Subprovince, with metamorphic conditions ranging from greenschist to amphibolite facies analogous to metamorphism in the Wawa Subprovince and Michipicoten belt.
Mapping and investigative work has been conducted by the Geological Survey of Canada, the Ontario Geological Survey, academic institutions such as the University of Toronto, the University of Manitoba, and the University of Western Ontario, and by exploration geologists associated with companies listed on exchanges including the Toronto Stock Exchange. Key geologists and research teams published syntheses and regional maps in the tradition of studies comparable to those for the Abitibi Subprovince, the Uchi Subprovince, and the Wabigoon–English River boundary area delineations, employing geophysical surveys (magnetic, gravity, EM), geochemical sampling, and structural analysis methods developed in parallel with investigations of the Flin Flon Belt and the Michipicoten greenstone belt. Ongoing studies integrate new geochronology, petrology, and airborne geophysics analogous to multidisciplinary campaigns in the Superior Province.