Geochronological constraints on the tectonic evolution of a late Archaean greenstone belt, Wabigoon Subprovince, Northwest Ontario, Canada

Davis, Don W.; Sutcliffe, R. H.; Trowell, N. F.

doi:10.1016/0301-9268(88)90041-1

Cited by 85 publications

(27 citation statements)

References 26 publications

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“…The Minnitaki Group overlies the tholeiitic division, the latter dated at 2733 + 1 Ma (Davis and Trowell 1982) just northeast of the Sandybeach Lake area. A 2712.9 2 1.5 Ma maximum age for the Minnitaki Group south of Sioux Lookout (Davis et al 1988) supports this temporal relationship.…”

Section: Regional Stratigraphie Relationshipssupporting

confidence: 61%

Regional setting of vein-style gold mineralization around the Goldlund mine, Sandybeach Lake area, northwestern Ontario

Chorlton¹

1990

Can. J. Earth Sci.

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The Sandybeach Lake area was deformed in four stages. Stage 1 produced gently south-southeast-dipping foliations at low angles to bedding. Stage 2 involved draping of these planes and formation of contact-strain aureoles related to the emplacement of granitoid stocks. Stage 3 produced doubly plunging folds, steep foliations, and shear zones, which resulted from regional transpression, with a sinistral lateral shear sense along this arm of the Wabigoon greenstone belt. Stage 4 produced minor folds and shear displacements in some places and final tightening of stage 3 folds in others, compatible with final regional convergence.Regional quartz veins, including those canying gold, appear to have filled tensional fractures related to bulk beltperpendicular shortening and belt-parallel extension, sinistral shear, and tightening of folds in sheetlike competent bodies. Veins and mineralization thus coincided with late stage 3 deformation, possibly overlapping stage 4.Auriferous vein occurrences at the Goldlund mine display geometries similar to those of veins in the surrounding region. The main body of auriferous vein mineralization is hosted by a thick, composite metatonalite-metadionte sheet. The vein system of this zone likely originated during the steepening and axial-plane transposition of the southeast-dipping limb near the southwest-plunging end of a stage 3 fold.La région du lac Sandybeach a été plissée à quatre reprises. La première phase de plissement a engendré des foliations légèrement inclinées vers le sud-sud-est, sécantes à la stratifications à petits angles. La phase 2 implique un drapement de ces plans et la formation d'auréoles de contraintes sur les contacts qui sont associés à la mise en place de petits massifs de granitoïdes. La phase 3 a créé des plis à double plongée, des foliations subverticales, et des zones de cisaillement, qui résultent d'une transpression régionale, avec un cisaillement senestre latéral le long de ce bras de la ceinture de roches vertes de Wabigoon. La phase 4 a produit des plis mineurs, à certains endroits des mouvements cisaillants, et ailleurs un reserrement final des plis de la phase 3, compatibles avec la convergence régionale.Les veines de quartz dans la région, incluant celles renfermant de l'or, résultent probablement du comblement des fractures de tension dues au raccourcissement perpendiculaire général et à l'extension parallèle à la ceinture, au cisaillement senestre, et au resserrement des plis en corps compétents en forme de feuillets. La formation des veines et leur minéralisation coïncident donc avec la phase 3 de déformation, chevauchant possiblement la phase 4.Les veines auriferes de la mine Goldlund exhibent des géométries semblables à celles des veines de la région environnante. Le corps principal qui renferme les veines aurifères est encaissé dans un feuillet épais de métatonalite-métadiorite composite. Le système de veines dans cette zone fut vraisemblablement mis en place durant l'épisode de redressement subvertical et de la transposition du plan axial du...

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Section: Regional Stratigraphie Relationshipssupporting

confidence: 61%

Regional setting of vein-style gold mineralization around the Goldlund mine, Sandybeach Lake area, northwestern Ontario

Chorlton¹

1990

Can. J. Earth Sci.

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“…Province (e.g., Davis et al 1988Davis et al , 1989Davis et al , 1990Devaney and Williams 1989;Corfu and Ayres 1991;Mueller and Donaldson 1992).…”

Section: Pre-2800 Ma Magnzatic Evolutionmentioning

confidence: 99%

U–Pb geochronology of the central Uchi Subprovince, Superior Province

Corfú¹,

Stott²

1993

Can. J. Earth Sci.

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U–Pb zircon and titanite ages for rocks of the central Uchi Subprovince in northwestern Ontario indicate a late Archean magmatic and tectonic development spanning over 200 Ma. An early period at 2900–2800 Ma formed volcano-plutonic complexes, presumably linked to 3.1–2.8 Ga terrains of the northwestern Superior Province. A later period of southward growth by magmatic and tectonic accretion occurred at 2750–2710 Ma and was concluded by large scale compression and plutonism at 2700 Ma.The oldest 2890–2860 and 2840–2820 Ma components occur in the Pickle Lake and Meen–Dempster greenstone belts and as gneisses in the Seach–Achapi and the Lake St. Joseph batholiths in northern and central sectors of the region. Together with distinct 2750–2740 Ma volcano-plutonic complexes they form a collage assembled by multiple episodes of tectonic juxtaposition and magmatic accretion. Plutons of 2730–2710 Ma age are intrusive into these older, northern domains, whereas their volcanic counterparts compose the Lake St. Joseph and Miminiska – Fort Hope greenstone belts to the south. Late-tectonic to posttectonic granitoid rocks intruded a region extending from the northern Berens River Subprovince to the southern English River Subprovince at 2700 Ma. These plutons were cut by regional scale faults formed by residual north-northwest directed shortening. The timing of this movement seems to be recorded by titanite ages of 2690–2670 Ma. Reactivation of the same faults may account for Proterozoic Pb loss observed in some of the zircon populations. The age patterns are consistent with crustal growth along a continental margin in a north-dipping subduction environment.

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“…Proposed genetic models for granite-greenstone terranes run the gamut from early vertical tectonic scenarios involving ensialic processes (e.g., Macgregor, 1951;Baragar and McGlynn, 1976;Goodwin, 1981); to uniformitarian plate-tectonic models involving arcs (Glikson, 1972;Tarney et al, 1976;Dimroth et al, 1982;Windley, 1984); to a presently popular model involving marginal oceanic terrane accretion and mixed arc-plume magmatism (e.g., Drury et al, 1984;Davis et al, 1988;Card, 1990;Williams, 1990;Desrochers et al, 1993;Kimura et al, 1993;de Wit, 1998;Kusky, 1998;Kusky and Polat, 1999;Lowe, 1999;Daigneault et al, 2002;Chown et al, 2002;Dirks et al, 2002;Percival et al, 2004). Recently, vertical magmatic-tectonic scenarios for craton cores involving partial convective overturn have regained favour (Davidson, 1980;Hickman, 1983Hickman, , 1984Hickman, , 2004Bouhallier et al, 1995;Chardon et al, 1996Chardon et al, , 1998Chardon et al, , 2002Collins et al, 1998;Bleeker, 2002;Rey et al, 2003;Bédard et al, 2003;Van Kranendonk et al, 2004;Ketchum et al, 2004); and increased attention is being focused on proposals for progressive maturation of Iceland-type crust above major mantle upwellings (Lambert, 1981;…”

Section: Introductionmentioning

confidence: 99%

A catalytic delamination-driven model for coupled genesis of Archaean crust and sub-continental lithospheric mantle

Bédard

2006

Geochimica et Cosmochimica Acta

734

351

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Geochronological constraints on the tectonic evolution of a late Archaean greenstone belt, Wabigoon Subprovince, Northwest Ontario, Canada

Cited by 85 publications

References 26 publications

Regional setting of vein-style gold mineralization around the Goldlund mine, Sandybeach Lake area, northwestern Ontario

Regional setting of vein-style gold mineralization around the Goldlund mine, Sandybeach Lake area, northwestern Ontario

U–Pb geochronology of the central Uchi Subprovince, Superior Province

A catalytic delamination-driven model for coupled genesis of Archaean crust and sub-continental lithospheric mantle

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