Evolution of the southern Abitibi greenstone belt based on U–Pb geochronology: autochthonous volcanic construction followed by plutonism, regional deformation and sedimentation

Ayer, J. A.; Amelin, Yuri; Corfú, Fernando; Kamo, Sandra L.; Ketchum, J. W. F.; Kwok, K.; Trowell, N. F.

doi:10.1016/s0301-9268(02)00006-2

Cited by 259 publications

(160 citation statements)

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“…Le Groupe du Timiskaming est l'unité lithologique archéenne la plus jeune de la Mueller et al, 1994a;Ayer et al, 1999;Ayer et al, 2002).…”

Section: 7-groupe De Timiskamingunclassified

“…L'épisode représenterait un tectonisme en extension ou en transpression associé à un magmatisme d'arc insulaire et une sédimentation dans lesquels les unités supracrustales sont déposées dans des environnements de cônes alluvionnaires subaériens et fluviatiles, où elles sont étroitement associées à des failles régionales , Mueller et al, 1994b, Mueller et al, 1996, Ayer et al, 2002.…”

Section: 7-groupe De Timiskamingunclassified

“…Province de Supérieur (Shegelski, 1980;David et Lajoie, 1989;Mueller et al, 1991) et constitue un assemblage sédimentaire déposé lors de l'épisode orogénique situé entre 2687 et 2675 Ma d'années (Ayer et al, 2002). Il est constitué de conglomérats et de grès localement associés à des roches volcaniques et synchrones à des plutons à affinités alcalines Mueller et al, 1994a;Ayer et al, 1999;Ayer et al, 2002).…”

Section: 7-groupe De Timiskamingunclassified

“…Plusieurs références font allusion à une tectonique de convergence entre la ZVS de l'Abitibi et le prisme accrétionnaire de la Sous-province de Pontiac ou une tectonique de collision continentale entre la plaque abitibienne et celle de Pontiac (Ayer et al, 2002;Chown et al, 1992;Daigneault et al, 2002;Daigneault et al, 2004;Dimroth et al, 1983a, b;Dimroth et al, 1982;Feng et Kerrich, 1991;Ludden et al, 1986;Mueller et al, 1996). Le bassin pourrait A l'image des bassins frontaux ou forarc basin, le bassin de Granada renferme une succession très épaisse de dépôts alluvionnaires comparés aux dépôts marins.…”

Section: 4-modèle Paléogéographique Et Tectoniqueunclassified

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Caractéristiques sédimentologiques, volcanologiques et structurales du bassin de Granada dans la ceinture de roches vertes de l'Abitibi (Québec) /

Diop¹

2011

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The Granada Basin, correspond to the stratigraphie unit known as the Granada Formation. This unit lies in the southernmost part of the Southern Volcanic Zone of the greenstone dominated Abitibi Subprovince in Quebec.Faciès analysis in the Granada Basin has identified clastic and volcaniclastic rocks deposited in an environment evolving from relatively deep marine to fluvial. The earliest sediments were mainly turbidites (faciès la and lb) deposited in extensional sub-basins. These sediments were overlain by a regressive sequence that evolved from shallow marine wave base dominated sediments (faciès 2a) to coastal deposits (faciès 2b). These deposits represent the transition between marine and continental depositional environments. The transition zone is marked by deposits of sandstoneargillites-stratified pebble conglomerate (faciès 2b) transported by waves and tides between the subtidal and intertidal zone. Faciès 3a and 3b of the felsic volcaniclastic lithofacies are interbedded with faciès la, lb and 2a.Deposits of the Granada Basin are transitional faciès separated by intra-basin unconformities, which are characteristic of sedimentary basins formed along fault margins. The volcano-sedimentary deposits of the Granada Basin have characteristics of sedimentation influenced by tectonisme such as: i) local and basinwide lateral and vertical faciès variations; ii) alternating fining and coarsening upwards sequences; iii) high rate of accumulation of sediments; iv) some conglomerate boulders are over 1 m in size and the thickness of conglomerate deposits; v) interdigitation of conglomerates and sandstones that denotes a progradation; vi) intra-basin unconformities; vii) the local source of conglomerates; and viii) associated alkaline magmatism. Tectonism would be ongoing throughout the development of the basin which would have induced several phases of source renewal areas for the sediments coupled with intra-basin unconformities. The earliest formed sedimentary deposits of the Granada Basin were affected by uplift and subsequently eroded and recycled into later basin fill along intra-basin unconformities. Gradually as the basin filled the sedimentary deposits became less and less shallower which is a characteristic of piggyback-type basins. The decrease in the depth is a consequence of an increase in topography due to repeated uplift along faults.Sedimentary rocks of the Granada Basin were intruded by alkalic mature volcanic arc-type sills, stocks and porphyritic dikes. These intrusive rocks are similar to Timiskaming-type porphyry intrusions and volcanic rocks found in the Kirkland Lake area of Ontario.The structural style of the Granada Basin, consisting of overturned southward verging tight to isoclinal folds, is characteristic of thrust basins. Two major east-west trending synclinal axial traces are distinguishable and their juxtaposition in a back to back relationship is compatible with there being an unconformity between them. This unconformity is further demonstrated by the presence of sandstone cla...

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“…Le Groupe du Timiskaming est l'unité lithologique archéenne la plus jeune de la Mueller et al, 1994a;Ayer et al, 1999;Ayer et al, 2002).…”

Section: 7-groupe De Timiskamingunclassified

Section: 4-modèle Paléogéographique Et Tectoniqueunclassified

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Caractéristiques sédimentologiques, volcanologiques et structurales du bassin de Granada dans la ceinture de roches vertes de l'Abitibi (Québec) /

Diop¹

2011

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“…The greenstones of the Abitibi greenstone belt of Ontario and Quebec are widely regarded to have formed from largely juvenile mantle sources. They have the most radiogenic initial Nd -isotope compositions for rocks of that age and, undoubtedly, have come from the depleted mantle (Ayer et al 2002 ). Thus, Abitibi and Wabigoon greenstone belt initial Pb (conveniently preserved in ores and feldspars) can be used to test the accuracy of the dynamic U/Pb model.…”

Section: The Lower Crust As a Partly Hidden Reservoir Of Incompatiblementioning

confidence: 99%

Geochemistry and Secular Geochemical Evolution of the Earth's Mantle and Lower Crust

Kamber

2011

Frontiers in Geochemistry

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Metallogeny of the Abitibi Greenstone Belt, Canada

MERCIER‐LANGEVIN,

DUBÉ,

HOULÉ

et al. 2023

Metallic Resources 2

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Evolution of the southern Abitibi greenstone belt based on U–Pb geochronology: autochthonous volcanic construction followed by plutonism, regional deformation and sedimentation

Cited by 259 publications

References 60 publications

Caractéristiques sédimentologiques, volcanologiques et structurales du bassin de Granada dans la ceinture de roches vertes de l'Abitibi (Québec) /

Caractéristiques sédimentologiques, volcanologiques et structurales du bassin de Granada dans la ceinture de roches vertes de l'Abitibi (Québec) /

Geochemistry and Secular Geochemical Evolution of the Earth's Mantle and Lower Crust

Metallogeny of the Abitibi Greenstone Belt, Canada

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